Electronic control system and drive-by-wire chassis system

Abstract

The invention provides an electronic control system and a drive-by-wire chassis system. The electronic control system comprises an electromagnetic valve driving chip, a system control chip and a power supply chip, m paths of first driving modules and N paths of second driving modules are integrated in the electromagnetic valve driving chip, each path of first driving module drives a corresponding electromagnetic valve at a high side or a low side, each path of second driving module drives a corresponding electromagnetic valve at a low side, and M + N is greater than or equal to 14; therefore, on the basis that multifunctional driving of the electromagnetic valve is met, the driving requirement of the electromagnetic valve is met. And as no external discrete device is arranged or an independent valve driving chip is additionally arranged, the reliability of the electronic control system is improved and the cost of the system is reduced. The system control chip outputs M + N paths of driving control signals to the logic control module according to external driving requirements on the M + N paths of electromagnetic valves; the power supply chip supplies power to all the first driving modules in the electromagnetic valve driving chip and the system control chip through power supply voltage.

Description

Technical Field

[0001] The invention relates to circuits, and in particular to an electronic control system and a wire-controlled chassis system. Background Art

[0002] With the continuous development of intelligent driving, intelligent chassis-by-wire technology has become an important support for the development of automobile intelligence. The core of intelligent chassis-by-wire technology is to achieve precise control of the vehicle by replacing traditional mechanical signals with electrical signals. This technology can significantly improve the vehicle's safety, driving experience, and control capabilities for performing advanced functions such as autonomous driving.

[0003] With its advantages of light weight, low cost, and high energy recovery efficiency, the One-Box system is gradually becoming the mainstream solution for wire control braking. Since the mechanical structure of the One-Box system includes multiple hydraulic valves, and each hydraulic valve is controlled by a solenoid valve, the electronic control system of the One-Box system needs to meet the driving requirements of the corresponding number of solenoid valves.

[0004] However, in the electronic control system of the existing One-Box system, the solenoid valve driver chip usually cannot meet the driving requirements of the solenoid valve, so manufacturers need to use external discrete devices (such as diodes, transistors, resistors and capacitors, etc.) to make up for the shortcomings of the solenoid valve driver chip, but this will reduce the reliability of the system solution. In addition to setting up discrete devices, some manufacturers will also choose to set up additional independent valve driver chips, but this will cause the waste of some drive paths and increase the system area, thereby increasing the system cost.

[0005] Therefore, providing an electronic control system that meets the solenoid valve driving requirements and has higher reliability and lower cost than the existing technology has become a technical problem that the industry urgently needs to solve. Summary of the invention

[0006] The technical problem solved by the present invention is to provide an electronic control system and a wire-controlled chassis system, which solves the problem that the electronic control system of the existing One-Box system cannot meet the driving requirements of the solenoid valve, resulting in reliability problems or cost problems in the electronic control system diagram.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides an electronic control system, which is used to drive a plurality of solenoid valves. The electronic control system includes: a solenoid valve driving chip, a system control chip and a power supply chip;

[0008] The solenoid valve driving chip integrates M first driving modules, N second driving modules and a logic control module; each of the first driving modules is connected to a corresponding solenoid valve, and each of the first driving modules is used to perform high-side driving or low-side driving on the corresponding solenoid valve according to the first driving signal; each of the second driving modules is also connected to a corresponding solenoid valve, and each of the second driving modules is used to perform low-side driving on the corresponding solenoid valve according to the second driving signal; the logic control module is used to output the corresponding first driving signal to the corresponding first driving module and output the corresponding second driving signal to the corresponding second driving module according to the input driving control signal; wherein N and M are both positive integers, and N+M≥14;

[0009] The system control chip is used to output M+N driving control signals to the logic control module according to external driving requirements for M+N solenoid valves;

[0010] The power supply chip is used to supply power to each driving module in the solenoid valve driving chip and the system control chip through a power supply voltage.

[0011] Optionally, the system control chip is also used to directly connect to each of the first drive modules through a first direct connection pin on the solenoid valve drive chip to directly control each of the first drive modules to drive the corresponding solenoid valve; and directly connect to some of the second drive modules through a second direct connection pin on the solenoid valve drive chip to directly control some of the second drive modules to drive the corresponding solenoid valve.

[0012] Optionally, each of the first driving modules includes a first driving unit, a second driving unit, a first power tube and a second power tube;

[0013] The first input end of the first driving unit and the first input end of the second driving unit are both connected to the logic control module, the second input end of the first driving unit and the second input end of the second driving unit are both connected to the corresponding first direct-connected pin, the output end of the first driving unit is connected to the gate of the first power tube, and the output end of the second driving unit is connected to the gate of the second power tube;

[0014] The drain of the first power tube is connected to the power supply voltage, and the source of the first power tube is connected to the drain of the second power tube; the drain of the second power tube is also connected to the corresponding solenoid valve, and the source of the second power tube is connected to the ground.

[0015] Optionally, each of the first driving modules further includes: a first short circuit detection unit, a first overcurrent detection unit, a second overcurrent detection unit and a first voltage clamping unit;

[0016] The first short circuit detection unit is used to compare the source voltage of the first power tube, the first reference voltage and the second reference voltage to implement short circuit diagnosis of the source of the first power tube and output a corresponding first short circuit detection signal, wherein the first reference voltage is greater than the second reference voltage;

[0017] The first overcurrent detection unit is used to compare the source voltage and the drain voltage of the first power tube to perform overcurrent detection on the first power tube, and output a corresponding first overcurrent detection signal according to the detection result;

[0018] The second over-current detection unit is used to compare the drain voltage of the second power tube with the third reference voltage to perform over-current detection on the second power tube, and output a corresponding second over-current detection signal according to the detection result;

[0019] The first voltage clamping unit is used to clamp the drain voltage of the second power tube and output a corresponding first voltage clamping signal;

[0020] The logic control module is also used for:

[0021] According to the input first over-current detection signal or the second over-current detection signal, the corresponding first power tube or the corresponding second power tube is turned off, and a first over-current warning signal corresponding to the first power tube or a second over-current warning signal corresponding to the second power tube is output to the system control chip;

[0022] Turning on the corresponding second power tube according to the input first voltage clamping signal; and

[0023] After the first power tube or the corresponding second power tube is turned off, the short circuit type of the drain of the corresponding second power tube is diagnosed according to the first short circuit detection signal, and a first short circuit fault signal is output to the system control chip.

[0024] Optionally, the system control chip is further used to perform a short circuit judgment on the drain of the corresponding second power tube according to the received first short circuit fault signal; if it is judged to be a short circuit, output a corresponding first shutdown signal to the power supply chip;

[0025] The power supply chip is also used to stop supplying power to the corresponding solenoid valve according to the first shutdown signal.

[0026] Optionally, the solenoid valve driver chip also includes a plurality of first digital filter units, the first end of each of the first digital filter units is connected to the second input end of the corresponding first drive unit and the second input end of the corresponding second drive unit, the second end of each of the first digital filter units is connected to the corresponding first direct connection pin, and each of the first digital filter units is used to perform delay filtering on the corresponding first drive unit and the corresponding second drive unit according to the input first filtering control signal.

[0027] Optionally, each of the second driving modules includes: a third driving unit and a third power tube;

[0028] The first input end of the third driving unit is connected to the logic control module, the second input end of the third driving unit is connected to the corresponding second direct connection pin, and the output end of the third driving unit is connected to the gate of the third power tube;

[0029] The drain of the third power tube is connected to the corresponding solenoid valve, and the source of the third power tube is connected to the ground.

[0030] Optionally, each of the second driving modules further includes: a second short circuit detection unit, a third overcurrent detection unit and a second voltage clamping unit;

[0031] The second short circuit detection unit is used to compare the drain voltage of the third power tube, the first reference voltage and the second reference voltage to implement short circuit diagnosis of the drain of the third power tube and output a corresponding second short circuit diagnosis signal, wherein the first reference voltage is greater than the second reference voltage;

[0032] The third over-current detection unit is used to compare the drain voltage of the third power tube with the third reference voltage to perform over-current detection on the third power tube, and output a corresponding third over-current detection signal according to the detection result;

[0033] The second voltage clamping unit is used to clamp the drain voltage of the third power tube and output a corresponding second voltage clamping signal;

[0034] The logic control module is also used for:

[0035] According to the input third over-current detection signal, the corresponding third power tube is turned off, and a third over-current warning signal corresponding to the third power tube is output to the system control chip;

[0036] Turning on the corresponding third power tube according to the input second voltage clamping signal; and

[0037] After the third power tube is turned off, the short-circuit type of the drain of the corresponding third power tube is diagnosed according to the second short-circuit detection signal, and a second short-circuit fault signal is output to the system control chip.

[0038] Optionally, the system control chip is further used to perform a short circuit judgment on the drain of the corresponding third power tube according to the received second short circuit fault signal; if it is judged to be short circuit, output a corresponding second shutdown signal to the power supply chip;

[0039] The power supply chip is also used to stop supplying power to the corresponding solenoid valve according to the second shutdown signal.

[0040] Optionally, the solenoid valve driving chip also includes a plurality of second digital filtering units, the first end of each of the second digital filtering units is connected to the second input end of the corresponding third driving unit, the second end of each of the second digital filtering units is connected to the corresponding second direct connection pin, and each of the second digital filtering units is used to perform delay filtering on the corresponding third driving unit according to the input second filtering control signal.

[0041] Optionally, the solenoid valve driving chip and the power supply chip are configured as discrete structures.

[0042] Optionally, the electronic control system further includes a plurality of current detection modules, each current detection module corresponds to one or more solenoid valves, and the current detection module is used to detect the current flowing through the corresponding solenoid valve and output the detected current information to the system control chip.

[0043] An embodiment of the present invention further provides a wire-controlled chassis system, comprising the electronic control system.

[0044] Compared with the prior art, the technical solution of the embodiment of the present invention has the following beneficial effects:

[0045] In the electronic control system of the technical solution of the present invention, the solenoid valve driver chip integrates M first driver modules and N second driver modules, each of the first driver modules drives a corresponding solenoid valve at the high side or low side, and each of the second driver modules drives a corresponding solenoid valve at the low side, M+N is greater than or equal to 14; thus, on the basis of satisfying the multifunctional drive of the solenoid valve, the drive requirements of the solenoid valve are met. In addition, because the present invention does not have external discrete devices or additional independent valve driver chips, but integrates several driver modules that can meet the drive requirements of the solenoid valve in one chip, the reliability of the electronic control system is improved and the cost of the system is reduced.

[0046] Furthermore, in addition to indirectly controlling the driving of the first drive module and the second drive module respectively through the driving control signal, the system control chip is also directly connected to the first drive module through the first direct connection pin on the solenoid valve drive chip to directly control the driving of each of the first drive modules; and is directly connected to the second drive module through the second direct connection pin on the solenoid valve drive chip to directly control the driving of part of the second drive modules, thereby improving the accuracy and efficiency of the first drive module and the second drive module in driving the corresponding solenoid valves.

[0047] Furthermore, when the drain of the second power tube and the drain of the third power tube are short-circuited respectively, the power supply chip stops supplying power to the corresponding solenoid valve to forcibly shut down the corresponding power tube, thereby avoiding damage to the power tube due to overcurrent short circuit.

[0048] Furthermore, since the system control chip generates a glitch signal when directly controlling the corresponding driving module through the direct connection pin, a first digital filter unit is provided between the first driving unit, the second driving unit and the first direct connection pin to perform delay filtering on the corresponding first driving unit and the corresponding second driving unit; and a second digital filter unit is provided between the third driving unit and the second direct connection pin to perform delay filtering on the corresponding third driving unit, thereby preventing the system control chip from incorrectly controlling each driving unit due to the glitch signal.

[0049] Furthermore, by providing a first short-circuit detection unit, a first overcurrent detection unit, a second overcurrent detection unit and a first voltage clamping unit in each of the first driving modules, and providing a second short-circuit detection unit, a second overcurrent detection unit, a third overcurrent detection unit and a second voltage clamping unit in each of the second driving modules, the safety performance of the solenoid valve driving chip in driving each solenoid valve is greatly improved.

[0050] Furthermore, by separately arranging the solenoid valve driving chip and the power supply chip, the heating of the power supply chip is prevented from affecting the driving accuracy of each driving module, thereby improving the driving accuracy of each driving module in the solenoid valve driving chip. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] Figure 1 A schematic diagram of the module structure of the electronic control system provided by the technical solution of the present invention;

[0052] Figure 2 A schematic diagram of the circuit structure of an electronic control system provided in an embodiment of the present invention Figure 1 ;

[0053] Figure 3A schematic diagram of the circuit structure of an electronic control system provided in an embodiment of the present invention Figure 2 ;

[0054] Figure 4 A schematic diagram of the circuit structure of an electronic control system provided in an embodiment of the present invention Figure 3 ;

[0055] Figure 5 A schematic diagram of the circuit structure of an electronic control system provided in an embodiment of the present invention Figure 4 . DETAILED DESCRIPTION

[0056] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. The terms "first", "second", "third", "fourth", etc. (if any) in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0057] As described in the background technology, the electronic control system of the existing One-Box system is unable to meet the driving requirements of the solenoid valve and therefore sets up external discrete devices or independent valve driving chips, which may lead to reliability or cost issues in the electronic control system.

[0058] In view of this, the technical solution of the present invention provides a new electronic control system applied to a One-Box system, wherein the electronic control system is used to drive a plurality of solenoid valves.

[0059] in, Figure 1 A schematic diagram of the module structure of the electronic control system provided by the technical solution of the present invention.

[0060] Please refer to Figure 1 The electronic control system provided by the technical solution of the present invention includes: a solenoid valve driving chip 10, a system control chip 20 and a power supply chip 30;

[0061] The solenoid valve driver chip 10 integrates M first driver modules 110, N second driver modules 120 and a logic control module 130; each of the first driver modules 110 is connected to a corresponding solenoid valve, and each of the first driver modules 110 is used to perform high-side drive or low-side drive on the corresponding solenoid valve according to the first drive signal; each of the second driver modules 120 is also connected to a corresponding solenoid valve, and each of the second driver modules 120 is used to perform low-side drive on the corresponding solenoid valve according to the second drive signal; the logic control module 130 is used to output the corresponding first drive signal to the corresponding first driver module 110 and output the corresponding second drive signal to the corresponding second driver module 120 according to the input drive control signal va; wherein N and M are both positive integers, and N+M≥14;

[0062] The system control chip 20 is used to output M+N driving control signals va to the logic control module 130 according to external driving requirements for M+N solenoid valves;

[0063] The power supply chip 30 receives a power supply voltage VBAT, and the power supply voltage VBAT is used to power the power supply chip 30 . The power supply chip 30 is used to convert the power supply voltage VBAT into a corresponding power supply voltage to respectively power each driving module in the solenoid valve driving chip 10 and the system control chip 20 .

[0064] Through the above technical means, the technical solution of the present invention can meet the driving requirements of the solenoid valve while meeting the multifunctional driving requirements of the solenoid valve, and can also improve the reliability of the electronic control system and reduce the cost of the system. The specific principle is as follows:

[0065] In the solenoid valve driver chip 10, M first driver modules 110 and N second driver modules 120 are integrated. Each of the first driver modules 110 is connected to a corresponding solenoid valve, and each of the first driver modules 110 is used to perform high-side drive or low-side drive on the corresponding solenoid valve according to the first drive signal; each of the second driver modules 120 is also connected to a corresponding solenoid valve, and each of the second driver modules 120 is used to perform low-side drive on the corresponding solenoid valve according to the second drive signal, and M+N is greater than or equal to 14. Therefore, a part of the solenoid valves that only need low-side drive are driven by the second driver module 120, and a part of the solenoid valves that need to change the drive state according to different application scenarios are driven by the first driver module 110, thereby satisfying the multi-functional drive of the solenoid valve.

[0066] Furthermore, because the total number of the first driving module 110 and the second driving module 120 is greater than or equal to 14, the number requirement of the electronic control system for the solenoid valve drive is met. Also, because the solenoid valve driving chip 10 does not require an external discrete device or an external independent valve driving chip, the reliability of the electronic control system is improved and the cost of the system is reduced.

[0067] In order to make the above-mentioned objects, features and beneficial effects of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0068] Please refer to Figure 1 As a specific implementation, the solenoid valve driving chip 10 and the power supply chip 30 are separately arranged, so as to avoid the heating of the power supply chip 30 affecting the driving accuracy of each driving module in the solenoid valve driving chip 10, thereby improving the driving accuracy of each driving module.

[0069] Figure 2 A schematic diagram of the circuit structure of an electronic control system provided in an embodiment of the present invention Figure 1 .

[0070] Please refer to Figure 2 As a specific implementation, the system control chip 20 is used to output M+N driving control signals va to the logic control module 130 according to the external driving requirements for M+N solenoid valves, specifically including:

[0071] According to the external driving requirements for the M+N-way solenoid valves, the system control chip 20 outputs the M+N-way driving control signals va to the logic control module 130 through SPI (Serial Peripheral Interface) communication. After receiving the M+N-way driving control signals va, the logic control module 130 outputs the M-way first driving signals to the corresponding M-way first driving modules 110 through SPI communication, and outputs the N-way second driving signals to the corresponding N-way second driving modules 120 through SPI communication, so as to control the driving degree of each driving module on the corresponding solenoid valve.

[0072] According to the principle of SPI communication, when the system control chip 20 outputs the M+N drive control signals va to the logic control module 130, it does not output them simultaneously but outputs them sequentially, that is, after the system control chip 20 outputs one drive control signal va to the logic control module 130, it outputs the next drive control signal va to the logic control module 130 until all the M+N drive control signals va are output to the logic control module 130.

[0073] Due to the polling control principle of SPI communication, it will cause delay in the control of the subsequent drive module. In the application scenario where the solenoid valve needs to be frequently turned on and off, the transmission of control signals through SPI communication will cause a large accuracy error in the drive of the solenoid valve. In order to solve the control delay problem of SPI communication, the embodiment of the present invention provides the following solution.

[0074] Please refer to Figure 2 As a specific implementation, the solenoid valve driver chip 10 is further provided with M first direct connection pins IN1 and H second direct connection pins IN2, each of the first direct connection pins IN1 is connected to a corresponding first driver module 110, and each of the second direct connection pins IN2 is connected to a corresponding second driver module 120. Wherein, H is a positive integer, and H <N。

[0075] The system control chip 20 is also used for:

[0076] Connecting its own I / O (input / output) interface module 210 to the first direct connection pin IN1, so that the system control chip 20 directly controls the first driving module 110 to drive the corresponding solenoid valve; and;

[0077] The I / O interface module 210 thereof is connected to the second direct connection pin IN2 , so that the system control chip 20 directly controls the second driving module 120 to drive the corresponding solenoid valve.

[0078] Specifically, the system control chip 20 directly outputs the driving control signal va to the corresponding first driving module 110 or the second driving module 120 according to demand, without transmitting the driving control signal va through SPI communication.

[0079] Through the above technical means, the system control chip 20 realizes direct control of different drive modules, so that the control of different drive modules does not interfere with each other, thereby greatly reducing the control delay of the drive module and further improving the precision of the solenoid valve drive.

[0080] Among them, the system control chip 20 can perform mixed control of SPI communication control and pin direct connection control on the M-way first drive module 110 and the N-way second drive module 120, and change the mixed control ratio according to different application scenarios. For example, M is equal to 4, N is equal to 10, and the solenoid valves corresponding to the 4-way first drive module 110 are all used to control the current; among the 10-way second drive modules 120, the solenoid valves corresponding to the 4-way second drive modules 120 are used to drive the switch, and the solenoid valves corresponding to the 6-way second drive modules 120 are used to control the current. Therefore, the system control chip 20 can be set to perform only SPI communication control on the second drive module 120 controlled by the 4-way switch, and perform SPI communication control and pin direct connection control on the first drive module 110 controlled by the 4-way current and the second drive module 120 controlled by the 6-way current at the same time. Of course, this is just a specific example, and the actual control method can vary according to different application scenarios, which is not limited here.

[0081] However, the direct connection control of the driving module by the system control chip 20 through the direct connection pin may generate a burr signal and cause erroneous control of the corresponding driving module. To solve the erroneous control problem caused by the burr signal, the embodiment of the present invention provides the following solution.

[0082] Please refer to Figure 2 As a specific implementation, the solenoid valve driving chip 10 further integrates a plurality of first digital filtering units 150 and a plurality of second digital filtering units 160 .

[0083] Each of the first digital filtering units 150 corresponds to a driving module, the first end of each of the first digital filtering units 150 is connected to the input end of the corresponding first driving module 110, the second end of each of the first digital filtering units 150 is connected to the corresponding first direct-connection pin IN1, and each of the first digital filtering units 150 is used to perform delay filtering on the input end of the corresponding first driving module 110 according to the input first filtering control signal to filter out the burr signal at the input end of the corresponding first driving module 110.

[0084] Each of the second digital filtering units 160 corresponds to a second driving module 120, the first end of each of the second digital filtering units 160 is connected to the input end of the corresponding second driving module 120, the second end of each of the first digital filtering units 150 is connected to the corresponding second direct-connect pin IN2, and each of the second digital filtering units 160 is used to perform delay filtering on the input end of the corresponding second driving module 120 according to the input second filtering control signal to filter out the burr signal at the input end of the corresponding second driving module 120.

[0085] Among them, multiple time gears can be set for the filtering delay of the first digital filtering unit 150. According to different application scenarios, the corresponding time gear is selected by configuring the register to filter the input end of the corresponding first driving module 110. The number of gears and the specific time of the time gear can be set according to demand, and are not limited here. The function setting of the second digital filtering unit 160 is the same as that of the first digital filtering unit 150, and will not be repeated here.

[0086] The first digital filter unit 150 and the second digital filter unit 160 can both use digital filter circuits of the prior art, specifically composed of adders, multipliers and delay devices. Since the design of digital filter circuits is a common technical means in the field, it will not be described in detail here.

[0087] Please refer to Figure 2 As a specific implementation, the electronic control system also includes a plurality of current detection modules 140, each current detection module 140 corresponds to one or more solenoid valves, and the current detection module 140 is used to detect the current flowing through the corresponding solenoid valve and output the detected current information to the system control chip 20.

[0088] Among them, the number of the current detection modules 140 can be set to be the same as the number of solenoid valves, so that each current detection module 140 corresponds to one solenoid valve, that is, each current detection module 140 only detects the current flowing through the corresponding solenoid valve to improve the current detection accuracy. The number of the current detection modules 140 can also be set to be less than the number of solenoid valves, so that each current detection module 140 corresponds to multiple solenoid valves, that is, each current detection module 140 needs to detect the current flowing through multiple solenoid valves to reduce the circuit cost. Of course, the setting of the current detection module 140 can be selected according to demand and is not limited here.

[0089] In addition, the current detection module 140 can be partially integrated into the solenoid valve driver chip 10, and partially used as a discrete device of the electronic control system. For example, the current detection module 140 for detecting the solenoid valve corresponding to the first driver module 110 is integrated into the solenoid valve driver chip 10, and the current detection module 140 for detecting the solenoid valve corresponding to the second driver module 120 is used as a discrete device of the electronic control system. Of course, the specific layout of the current detection module 140 can be set according to needs and is not limited here.

[0090] The system control chip 20 converts the current information input by the current detection module 140 into a corresponding current digital signal through the analog-to-digital conversion module 220 disposed inside.

[0091] It should be noted that the current detection module 140 is a conventional technical means in the art, and its working principle and circuit structure are not described in detail here.

[0092] Please refer to Figure 2 As a specific implementation, each of the first driving modules 110 includes: a first driving unit 111, a second driving unit 112, a first power tube M1 and a second power tube M2. The first input end of the first driving unit 111 and the first input end of the second driving unit 112 are both connected to the logic control module 130. The second input end of the first driving unit 111 and the second input end of the second driving unit 112 are both connected to the first end of the first digital filtering unit 150. The output end of the first driving unit 111 is connected to the gate of the first power tube M1, and the output end of the second driving unit 112 is connected to the gate of the second power tube M2. The drain of the first power tube M1 is connected to the power supply voltage VBAT, and the source of the first power tube M1 is connected to the drain of the second power tube M2. The drain of the second power tube M2 is also connected to the corresponding solenoid valve, and the source of the second power tube M2 is connected to the ground.

[0093] The first drive unit 11 can drive the corresponding solenoid valve at the high side through the first drive unit 111 and the first power tube M1, and can drive the corresponding solenoid valve at the low side through the second drive unit 112 and the second power tube M2, thereby meeting the driving requirements of the corresponding solenoid valve in different application scenarios. The specific driving mode of the corresponding solenoid valve is regulated by the first driving signal output by the logic control module 130.

[0094] Whether the first driving module 110 performs high-side driving or low-side driving on the corresponding solenoid valve is determined according to different application scenarios and is controlled by the first driving signal.

[0095] Please refer to Figure 2 As a specific implementation, each of the first driving modules 110 further includes: a first short circuit detection unit 113, a first overcurrent detection unit 114, a second overcurrent detection unit 115 and a first voltage clamping unit 116;

[0096] When the first power tube M1 drives the corresponding solenoid valve at the high side, and when the second power tube M2 drives the corresponding solenoid valve at the low side, both the first power tube M1 and the second power tube M2 may have overcurrent. Therefore, the first overcurrent detection unit 114 is set to compare the drain-source voltage of the first power tube M1 with the overcurrent reference voltage to perform overcurrent detection on the first power tube M1, and output the corresponding first overcurrent detection signal vb1 according to the detection result; and the second overcurrent detection unit 115 is set to compare the drain voltage of the second power tube M2 with the third reference voltage VREF3 to perform overcurrent detection on the second power tube M2, and output the corresponding second overcurrent detection signal vb2 according to the detection result. After receiving the first overcurrent detection signal vb1 or the second overcurrent detection signal vb2, the logic control module 130 will output a shutdown signal to the first driving module with the overcurrent power tube, so that the corresponding driving unit in the first driving module turns off the overcurrent power tube.

[0097] Although the logic control module 130 will shut down the first power tube M1 or the second power tube M2 when there is an overcurrent, the first power tube M1 or the second power tube M2 may not be shut down because the drain of the second power tube M2 is short-circuited to the ground or short-circuited to the power supply. Therefore, after the first power tube M1 or the second power tube M2 is overcurrent and shut down, the first short circuit detection unit 113 compares the drain voltage of the second power tube M2, the first reference voltage VREF1 and the second reference voltage VREF2, and sends the corresponding first short circuit detection signal vd1 to the logic control module 130 according to the comparison result. The logic control module 130 will perform short circuit diagnosis on the drain of the corresponding second power tube M2, that is, the output port of the first driving module 110 where the second power tube M2 is located, according to the received first short circuit detection signal vd1, and output the first short circuit fault signal vd3 to the system control chip 20 according to the diagnosis result.

[0098] When the data processing module of the system control chip 20 determines that the received first short-circuit fault signal vd3 indicates that the drain of the corresponding second power tube M2 is short-circuited, the corresponding first shutdown signal vd1 is output to the power supply chip 30. The power supply chip 30 is used to stop supplying power to the corresponding solenoid valve and the corresponding power tube according to the first shutdown signal vd1, so as to forcibly shut down the corresponding first power tube M1 or the corresponding second power tube M2, thereby avoiding the corresponding first power tube M1 or the corresponding second power tube M2 from being unable to be shut down due to overcurrent short circuit. Of course, when the data processing module determines that the drain of the corresponding second power tube M2 is short-circuited, it is also possible not to output the corresponding first shutdown signal vd1 to the power supply chip 30. The specific measures can be selected according to actual needs and are not limited here.

[0099] In addition to the overcurrent detection of both the first power tube M1 and the second power tube M2 and the short circuit detection of the output port of the first driving module with the overcurrent power tube, when the solenoid valve is driven off, the drain voltage of the second power tube M2 will be increased due to the energy carried by the inductor in the solenoid valve, so the first voltage clamping unit 116 is set to clamp the drain voltage of the second power tube M2 and output the corresponding first voltage clamping signal vc1. The logic control module 130 is also used to turn on the corresponding second power tube M2 according to the input first voltage clamping signal vc1, so as to discharge the charge of the drain of the second power tube M2 to the ground, thereby reducing the drain voltage of the second power tube M2.

[0100] Please refer to Figure 2 As a specific implementation, the logic control module 130 includes: a first SPI communication interface unit 131, a drive control unit 132 and a diagnosis protection unit 133;

[0101] The first SPI communication interface unit 131 serves as a signal interaction window of the solenoid valve driving chip 10 , and is specifically used to output the received M-channel driving control signals va to the driving control unit 132 respectively.

[0102] The driving control unit 132 is specifically used for:

[0103] According to the M-way driving control signal va corresponding to the first driving module 110, the corresponding first driving signal is output to the corresponding first driving module 110 to control the driving mode and driving degree of the corresponding solenoid valve by the first driving module 110; wherein, controlling the driving mode of the corresponding solenoid valve by the first driving module 110 includes: configuring the first driving module 110 to perform high-side driving or low-side driving on the corresponding solenoid valve. Controlling the driving degree of the corresponding solenoid valve by the first driving module 110 includes: controlling the operating frequency and duty cycle of the first driving unit 111 driving the first power tube M1, or controlling the operating frequency and duty cycle of the second driving unit 112 driving the second power tube M2.

[0104] Of course, the driving degree of the corresponding solenoid valve by the first driving module 110 can also be controlled by directly connecting the pins of the system control chip 20, and the specific control method is not limited here.

[0105] The diagnostic protection unit 133 is specifically used for:

[0106] According to the received first over-current detection signal vb1 or the second over-current detection signal vb2, a corresponding shutdown signal is output to the corresponding first driving unit 111 or the corresponding second driving unit 112 to shut down the corresponding first power tube M1 or the corresponding second power tube M2.

[0107] According to the received first short-circuit detection signal vd1, the short-circuit type of the drain of the corresponding second power tube M2 is diagnosed, that is, whether the output port of the corresponding first driving module has a short-circuit fault, and when the drain of the corresponding second power tube M2 has a short-circuit fault, it is determined whether there is a short-circuit fault or a break fault, and the first short-circuit fault signal vd3 is output to the system control chip 20 through the first SPI communication interface unit 131 to notify the system control chip 20 of the short-circuit type of the drain of the corresponding second power tube M2.

[0108] According to the received first voltage clamping signal vc1, the corresponding second power tube M2 is turned on.

[0109] Please refer to Figure 2 As a specific implementation, the power supply chip 30 includes a power supply module 310 and a second SPI communication interface unit 320;

[0110] The second SPI communication interface unit 320 is specifically configured to output the received first shutdown signal vd1 to the power supply module 310 .

[0111] The power supply module 310 is specifically used for:

[0112] Convert the power supply voltage VBAT into a first power supply voltage VDD, and supply power to each first driving module 110 in the solenoid valve driving chip 10 through the first power supply voltage VDD;

[0113] Converting the power supply voltage VBAT into a second power supply voltage Vsupl, and supplying power to the I / O interface module 210 in the system control chip 20 through the second power supply voltage Vsupl;

[0114] Converting the power supply voltage VBAT into a third power supply voltage Vadc, and supplying power to the analog-to-digital conversion module 220 in the system control chip 20 through the third power supply voltage Vadc;

[0115] converting the power supply voltage VBAT into a fourth power supply voltage Vcore, and supplying power to a data processing module in the system control chip 20 through the fourth power supply voltage Vcore, and;

[0116] According to the first shut-off signal vd1, the power supply to the corresponding solenoid valve and the power tube path driving the solenoid valve is stopped.

[0117] Figure 3 A schematic diagram of the circuit structure of an electronic control system provided in an embodiment of the present invention Figure 2 The following Figure 3 Taking the illustrated embodiment as an example, the circuit structures of the first short circuit detection unit 113 , the first overcurrent detection unit 114 , the second overcurrent detection unit 115 and the first voltage clamping unit 116 are described in detail respectively.

[0118] Please refer to Figure 3 ,exist Figure 3 In the illustrated embodiment, the first short circuit detection unit 113 specifically includes: a first operational amplifier op1, a second comparator ap2 and a third comparator ap3;

[0119] The output end of the first operational amplifier op1 is connected to the drain of the second power tube M2 and to its own inverting input end, and the non-inverting input end of the first operational amplifier op1 is connected to a first voltage, and the first voltage is used to represent the drain voltage of the second power tube M2 when the solenoid valve is disconnected;

[0120] The inverting input terminal of the second comparator ap2 and the inverting input terminal of the third comparator ap3 are both connected to the inverting input terminal of the first operational amplifier op1, the non-inverting input terminal of the second comparator ap2 is connected to the first reference voltage VREF1, the non-inverting input terminal of the third comparator ap3 is connected to the second reference voltage VREF2, and the output terminal of the second comparator ap2 and the output terminal of the third comparator ap3 both serve as the output terminal of the first short circuit detection unit 113.

[0121] The first reference voltage VREF1 is greater than the first voltage, and the first voltage is greater than the second reference voltage VREF2.

[0122] In this embodiment, the working principle of the first short circuit detection unit 113 is:

[0123] When the first driving unit 11 performs high-side driving on the solenoid valve, the solenoid valve is connected between the first power tube M1 and the ground.

[0124] When the first power tube M1 is short-circuited, the first power tube M1 is turned off. If the source of the first power tube M1 is not short-circuited, the source voltage of the first power tube M1 will be close to the ground and will be less than the first reference voltage VREF1 and the second reference voltage VREF2. Because the inverting input terminal of the second comparator ap2 and the inverting input terminal of the third comparator ap3 are both connected to the source of the first power tube M1, the second comparator ap2 and the third comparator ap3 both output a high level.

[0125] If the source of the first power tube M1 is disconnected, the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 will both be connected to the first voltage due to the virtual short of the first operational amplifier op1. And because the first reference voltage VREF1 is greater than the first voltage, and the first voltage is greater than the second reference voltage VREF2, the second comparator ap2 outputs a high level, and the third comparator ap3 outputs a low level.

[0126] If the source of the first power tube M1 is short-circuited to the power supply, the inverting input terminals of the second comparator ap2 and the third comparator ap3 will both be connected to the power supply voltage, so the second comparator ap2 and the third comparator ap3 both output low level.

[0127] When the first driving unit 11 performs low-side driving on the solenoid valve, the solenoid valve is connected between the power supply voltage VBAT and the drain of the second power tube M2 .

[0128] When the second power tube M2 is short-circuited, the second power tube M2 is turned off. If the drain of the second power tube M2 is not short-circuited, the inverting input terminal of the second comparator ap2 and the inverting input terminal of the third comparator ap3 are both connected to the power supply voltage VBAT, so the second comparator ap2 and the third comparator ap3 both output a low level.

[0129] If the drain of the second power tube M2 is disconnected, the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 will both be connected to the first voltage due to the virtual short of the first operational amplifier op1. And because the first reference voltage VREF1 is greater than the first voltage, and the first voltage is greater than the second reference voltage VREF2, the second comparator ap2 outputs a high level, and the third comparator ap3 outputs a low level.

[0130] If the drain of the second power tube M2 is short-circuited to the ground, the drain voltage of the second power tube M2 will be close to the ground and will be smaller than the first reference voltage VREF1 and the second reference voltage VREF2. Because the inverting input terminal of the second comparator ap2 and the inverting input terminal of the third comparator ap3 are both connected to the drain of the second power tube M2, the second comparator ap2 and the third comparator ap3 both output a high level.

[0131] Therefore, no matter the solenoid valve is driven by a high side or a low side, the logic control module 130 can determine that the drain of the second power tube M2 is open circuited according to the high level output by the second comparator ap2 and the low level output by the third comparator ap3.

[0132] If the solenoid valve is a high-side drive, the logic control module 130 can determine that the drain of the second power tube M2 is not short-circuited according to the second comparator ap2 and the third comparator ap3 both outputting high levels. The logic control module 130 can also determine that the drain of the second power tube M2 is short-circuited to the power supply according to the second comparator ap2 and the third comparator ap3 both outputting low-high levels.

[0133] If the solenoid valve is a low-side drive, the logic control module 130 can determine that the drain of the second power tube M2 is not short-circuited according to the second comparator ap2 and the third comparator ap3 both outputting a low level. The logic control module 130 can also determine that the drain of the second power tube M2 is short-circuited to the ground according to the second comparator ap2 and the third comparator ap3 both outputting a high level.

[0134] Of course, the connection objects of the in-phase input terminal and the inverting input terminal of the second comparator ap2 and the third comparator ap3 can also be interchanged, so that the short-circuit judgment of the solenoid valve also needs to be adaptively changed, which will not be elaborated here.

[0135] The first short circuit detection unit 113 is Figure 3 In addition to the embodiments shown, there are other embodiments, please refer to Figure 4 ,in, Figure 4 A schematic diagram of the circuit structure of an electronic control system provided in an embodiment of the present invention Figure 3 .

[0136] Please refer to Figure 4 ,exist Figure 4 In the illustrated embodiment, the first short circuit detection unit 113 includes: a first switch SW1, a second switch SW2, a first current source Isource1, a second current source Isource2, a first resistor R1, a second resistor R2, a fourth comparator ap4 and a fifth comparator ap5;

[0137] A first end of the first switch SW1 is connected to a chip internal power supply voltage AVDD, and a second end of the first switch SW1 is connected to a first end of the first resistor R1;

[0138] The first resistor R1, the first current source Isource1, the second switch SW2, the second current source Isource2 and the second resistor R2 are connected in series in sequence, the positive electrode of the second current source Isource2 is also connected to the drain of the second power tube M2, and the second end of the second resistor R2 is grounded;

[0139] The non-inverting input terminal of the fourth comparator ap4 is connected to the negative electrode of the first current source Isource1, and the inverting input terminal of the fourth comparator ap4 is connected to the first reference voltage VREF1; the inverting input terminal of the fifth comparator ap5 is connected to the first end of the second resistor R2, and the non-inverting input terminal of the fifth comparator ap5 is connected to the second reference voltage VREF2; the output terminal of the fourth comparator ap4 and the output terminal of the fifth comparator ap5 are both used as the output terminal of the first short circuit detection unit 113;

[0140] The first switch SW1 and the second switch SW2 are both turned off when the corresponding solenoid valve is turned on, and the first switch SW1 and the second switch SW2 are both turned on when the corresponding solenoid valve is turned off.

[0141] In this embodiment, the working principle of the first short circuit detection unit 113 is as follows:

[0142] When the first driving unit 11 performs high-side driving on the solenoid valve, the solenoid valve is connected between the first power tube M1 and the ground.

[0143] When the solenoid valve is normally turned on, the first switch SW1 and the second switch SW2 are both turned off to avoid affecting the first power tube M1 and the second power tube M2 during the process of driving the solenoid valve.

[0144] When the first power tube M1 is short-circuited, both the first power tube M1 and the second power tube M2 are turned off.

[0145] In the first stage, the first switch SW1 is turned on and the second switch SW2 is kept off. At this time, if the source of the first power tube M1 is not open or short-circuited, the negative electrode of the first current source Isource 1 will be pulled down to the ground due to the source of the first power tube M1, and the fourth comparator ap4 outputs a low level. If the source of the first power tube M1 is short-circuited to the power supply, the negative electrode of the first current source Isource1 will be connected to the power supply voltage VBAT due to the source of the first power tube M1, and the fourth comparator ap4 outputs a low level.

[0146] In the second stage, the second switch SW2 is turned on and the first switch SW1 is turned off. At this time, if the source of the first power tube M1 is not open or short-circuited, the positive electrode of the second current source Isource2 is pulled close to the ground, and the fifth comparator ap5 outputs a high level. If the source of the first power tube M1 is short-circuited to the power supply, the positive electrode of the second current source Isource2 will be connected to the power supply voltage VBAT due to the source of the first power tube M1, and the fourth comparator ap4 outputs a low level.

[0147] Finally, according to the low level output of the fourth comparator ap4 in the first stage and the high level output of the fifth comparator ap5 in the second stage, it is determined that the source of the first power tube M1 is not open or short-circuited. And according to the low level output of the fourth comparator ap4 in the first stage and the low level output of the fifth comparator ap5 in the second stage, it is determined that the source of the first power tube M1 is short-circuited to the power supply.

[0148] When the first driving unit 11 performs low-side driving on the solenoid valve, the solenoid valve is connected between the power supply voltage VBAT and the second power tube M2 .

[0149] When the solenoid valve is normally turned on, the first switch SW1 and the second switch SW2 are both turned off to avoid affecting the first power tube M1 and the second power tube M2 during the process of driving the solenoid valve.

[0150] When the second power tube M2 is short-circuited, both the first power tube M1 and the second power tube M2 are turned off.

[0151] In the first stage, the first switch SW1 is turned on and the second switch SW2 is kept off. At this time, if the drain of the second power tube M2 is not open or short-circuited, the negative electrode of the first current source Isource1 will be connected to the power supply voltage VBAT due to the drain of the second power tube M2, and the fourth comparator ap4 outputs a low level. If the drain of the second power tube M2 is short-circuited to the ground, the negative electrode of the first current source Isource1 will be connected to the ground due to the drain of the second power tube M2, and the fourth comparator ap4 outputs a low level.

[0152] In the second stage, the second switch SW2 is turned on and the first switch SW1 is turned off. At this time, if the drain of the second power tube M2 is not open or short-circuited, the positive electrode of the second current source Isource2 is pulled close to the power supply voltage VBAT, and the fifth comparator ap5 outputs a low level. If the drain of the second power tube M2 is short-circuited to the ground, the positive electrode of the second current source Isource2 will be connected to the ground due to the drain of the second power tube M2, and the fourth comparator ap4 will output a high level.

[0153] Finally, according to the low level output of the fourth comparator ap4 in the first stage and the low level output of the fifth comparator ap5 in the second stage, it is determined that the drain of the second power tube M2 is not open or short-circuited. And according to the low level output of the fourth comparator ap4 in the first stage and the high level output of the fifth comparator ap5 in the second stage, it is determined that the drain of the second power tube M2 is short-circuited to the ground.

[0154] Of course, the connection objects of the in-phase input terminal and the inverting input terminal of the fourth comparator ap4 and the fifth comparator ap5 can also be interchanged, so that the circuit-breaking judgment of the solenoid valve also needs to be adaptively changed, which will not be elaborated here.

[0155] For the structure of the first overcurrent detection unit 114, please continue to refer to Figure 3 ;exist Figure 3 In the illustrated embodiment, the first overcurrent detection unit 114 specifically includes: a first comparator ap1 and a reference voltage source Vsource; the non-inverting input terminal of the first comparator ap1 is connected to the drain of the first power tube M1, the inverting input terminal of the comparator is connected to the positive electrode of the reference voltage source Vsource, and the negative electrode of the reference voltage source Vsource is connected to the source of the first power tube M1.

[0156] In this embodiment, the working principle of the first overcurrent detection unit 114 is as follows:

[0157] The non-inverting input terminal of the first comparator ap1 is connected to the drain of the first power tube M1, and the inverting input terminal of the first comparator ap1 is connected to the source of the first power tube M1 through the reference voltage source Vsource. Therefore, when the first power tube M1 is normally turned on, the voltage at the inverting input terminal of the first comparator ap1 will be higher than the voltage at the non-inverting input terminal, that is, the first comparator ap1 outputs a low level to indicate that the first power tube M1 is not over-current. However, when the drain voltage of the first power tube M1 drops to a level that makes the voltage at the non-inverting input terminal of the first comparator ap1 greater than the voltage at the inverting input terminal, the first comparator ap1 outputs a high level to indicate that the first power tube M1 is over-current.

[0158] Of course, the connection objects of the in-phase input terminal and the inverting input terminal of the first comparator ap1 can also be interchanged, so that the overcurrent determination of the first power tube M1 also needs to be adaptively changed, which will not be elaborated here.

[0159] Please continue to refer to Figure 3 ,exist Figure 3 In the illustrated embodiment, the second over-current detection unit 115 specifically includes: a third resistor R3, a fourth power tube M4, a fourth resistor R4 and a sixth comparator ap6;

[0160] A first end of the third resistor R3 is connected to the drain of the second power tube M2, and a second end of the third resistor R3 is connected to the drain of the fourth power tube M4;

[0161] The gate of the fourth power tube M4 is connected to the gate of the second power tube M2 and the output end of the second driving unit 112, and the source of the fourth power tube M4 is connected to the first end of the fourth resistor R4;

[0162] The non-inverting input terminal of the sixth comparator ap6 is connected to the source of the fourth power tube M4, the inverting input terminal of the sixth comparator ap6 is connected to the third reference voltage VREF3, and the output terminal of the sixth comparator ap6 serves as the output terminal of the second over-current detection unit 115;

[0163] A second end of the fourth resistor R4 is grounded;

[0164] The size of the fourth power tube M4 is proportional to the size of the second power tube M2.

[0165] It should be noted that the third reference voltage VREF3 is used to represent the voltage at the first end of the fourth resistor R4 when the current flowing through the second power tube M2 reaches the overcurrent critical point. Of course, the overcurrent critical point can be adaptively set according to different application scenarios and is not limited here.

[0166] In this implementation, the working principle of the second overcurrent detection unit 115 is as follows:

[0167] When the second power tube M2 is turned on, the fourth power tube M4 is also turned on. Since the size of the fourth power tube M4 is proportional to the size of the second power tube M2, the current flowing through the fourth power tube M4 is also proportional to the current flowing through the second power tube M2, which is equivalent to the current flowing through the second power tube M2 being proportionally reduced to the path where the fourth power tube M4 is located.

[0168] Furthermore, since the inverting input terminal of the sixth comparator ap6 is connected to the third reference voltage VREF3, and the non-inverting input terminal of the sixth comparator ap6 is connected to the drain of the fourth power tube M4, when the sixth comparator ap6 outputs a low level, it indicates to the logic control module 130 that the current flowing through the second power tube M2 is not over-current. When the sixth comparator ap6 outputs a high level, it indicates to the logic control module 130 that the current flowing through the second power tube M2 is over-current.

[0169] It should be noted that in order to avoid affecting the current flowing through the second power tube M2 when the second power tube M2 is turned on, the size of the fourth power tube M4 needs to be designed to be very small so that the current flowing through the fourth power tube M4 is very small.

[0170] Of course, the connection objects of the in-phase input terminal and the inverting input terminal of the sixth comparator ap6 can also be interchanged, so that the overcurrent judgment of the seventh power tube also needs to be adaptively changed, which will not be repeated here.

[0171] The first over-current detection unit 114 and the second over-current detection unit 115 are Figure 3 In addition to the embodiments shown, there are other embodiments, please refer to Figure 5 , Figure 5 A schematic diagram of the circuit structure of an electronic control system provided in an embodiment of the present invention Figure 4 .

[0172] exist Figure 5 In the illustrated embodiment, the first overcurrent detection unit 114 and the second overcurrent detection unit 115 both include: a fifth power tube M5, a third current source Isource3 and a seventh comparator ap7;

[0173] A negative electrode of the third current source Isource3 is connected to the power supply voltage VBAT, and a positive electrode of the third current source Isource3 is connected to the inverting input terminal of the seventh comparator ap7;

[0174] The non-inverting input terminal of the seventh comparator ap7 is connected to the drain of the second power tube M2, and the output terminal of the seventh comparator ap7 serves as the output terminal of the second over-current detection unit 115;

[0175] The drain of the fifth power tube M5 is connected to the positive electrode of the third current source Isource3, the gate of the fifth power tube M5 is connected to the gate of the second power tube M2, the source of the fifth power tube M5 is connected to the ground, and the size ratio of the fifth power tube M5 to the second power tube M2 is 1 / L, where L is a positive integer, and the larger L is, the more accurate the detection of the current flowing through the fifth power tube M5 is, thereby making the overcurrent detection of the second power tube M2 more accurate.

[0176] Since the working principles of the first overcurrent detection unit 114 and the second overcurrent detection unit 115 are the same, only the working principle of the second overcurrent detection unit 115 is described below. In this embodiment, the working principle of the second overcurrent detection unit 115 is as follows:

[0177] The third current source Isource3 and the fifth power tube M5 generate a reference voltage at the drain of the fifth power tube M5. The reference voltage is used to represent the drain voltage of the second power tube M2 when the second power tube M2 is over-currented.

[0178] Because the non-inverting input terminal of the seventh comparator ap7 is connected to the drain of the second power tube M2, and the inverting input terminal of the seventh comparator ap7 is connected to the positive electrode of the third current source Isource3, by comparing the drain voltage of the second power tube M2 with the reference voltage, it is possible to detect whether the second power tube M2 is overcurrent.

[0179] Please refer to Figure 3 ,exist Figure 3 In the illustrated embodiment, the first voltage clamping unit 116 specifically includes: a Zener diode D1, a fifth resistor R5, a sixth resistor R6 and a buffer;

[0180] The cathode of the Zener diode D1 is connected to the drain of the second power tube M2, and the anode of the Zener diode D1 is connected to the first end of the fifth resistor R5;

[0181] The second end of the fifth resistor R5 is connected to the first end of the sixth resistor R6, and the second end of the sixth resistor R6 is connected to the gate of the second power tube M2;

[0182] The input end of the buffer is connected to the second end of the fifth resistor R5 , and the output end of the buffer serves as the output end of the first voltage clamping unit 116 .

[0183] In this embodiment, the working principle of the first voltage clamping unit 116 is as follows:

[0184] When the drain voltage of the second power tube M2 is greater than the breakdown voltage of the Zener diode D1, that is, when the drain voltage of the second power tube M2 is overvoltage, the Zener diode D1 is broken down, and the drain voltage of the second power tube M2 is accumulated at the gate of the second power tube M2 to increase the gate voltage of the second power tube M2. The increase in the gate voltage of the second power tube M2 will further turn on the second power tube M2, thereby ensuring that the drain voltage of the second power tube M2 will not continue to increase, thereby achieving the clamping of the drain voltage of the second power tube M2. At the same time, the drain voltage of the second power tube M2 will also be fed back to the logic control module 130 through the voltage divider circuit composed of the fifth resistor R5, the sixth resistor R6 and the buffer, so as to determine whether the drain of the second power tube M2 is overvoltage through the logic control module 130.

[0185] Please refer to Figure 2 As a specific implementation, each of the second driving modules 120 includes: a third driving unit 121 and a third power tube M3, the first input end of the third driving unit 121 is connected to the logic control module 130, the second input end of the third driving unit 121 is connected to the first end of the second digital filtering unit 160, the output end of the third driving unit 121 is connected to the gate of the fourth power tube M4, the drain of the fourth power tube M4 is connected to the corresponding solenoid valve, and the source of the fourth power tube M4 is connected to the ground end.

[0186] The second driving module 120 is only used to perform low-side driving on the corresponding solenoid valve.

[0187] Please refer to Figure 2 As a specific implementation, each of the second driving modules 120 further includes: a second short circuit detection unit 122 , a third overcurrent detection unit 123 and a second voltage clamping unit 124 .

[0188] The functions of the second short circuit detection unit 122, the third overcurrent detection unit 123 and the second voltage clamping unit 124 are described below:

[0189] In terms of function, the third overcurrent detection unit 123 is used to compare the drain voltage of the third power tube M3 with the third reference voltage VREF3 to detect overcurrent of the third power tube M3, and output the corresponding third overcurrent detection signal vb3 according to the detection result. The logic control module 130 is also used to control the corresponding third driving unit 121 to turn off the corresponding third power tube M3 according to the input third overcurrent detection signal vb3. The second open and short circuit detection unit 122 is used to compare the drain voltage of the third power tube M3, the first reference voltage VREF1 and the second reference voltage VREF2 after the third power tube M3 is turned off due to overcurrent, so as to implement the open and short circuit diagnosis of the drain of the corresponding third power tube M3, and output the corresponding second open and short circuit diagnosis signal vd2 to the logic control module 130. The logic control module 130 is also used to diagnose the open and short circuit type of the drain of the corresponding third power tube M3 according to the second open and short circuit detection signal vd2, and output the second open and short circuit fault signal vd4 to the system control chip 20. The data processing module of the system control chip 20 is also used to output a corresponding second shutdown signal vd2 to the power supply chip 30 when it is determined that the drain of the corresponding third power tube M3 is short-circuited according to the second short-circuit fault signal vd4. The power supply chip 30 is also used to stop supplying power to the corresponding solenoid valve and the power tube path according to the second shutdown signal vd2, so as to avoid the corresponding third power tube M3 from being unable to be shut down due to overcurrent short circuit.

[0190] The second voltage clamping unit 124 is used to clamp the drain voltage of the third power tube M3 and output a corresponding second voltage clamping signal vc2. The logic control module 130 is also used to turn on the corresponding third power tube M3 according to the input second voltage clamping signal vc2.

[0191] Please refer to Figure 2 As a specific implementation, the first SPI communication interface unit 131 is further specifically used for:

[0192] The received N driving control signals va are output to the driving control unit 132 .

[0193] The driving control unit 132 is specifically used for:

[0194] According to the N-way driving control signal va corresponding to the second driving module 120, the corresponding second driving signal is output to the corresponding second driving module 120 to control the driving degree of the corresponding solenoid valve by the second driving module 120; wherein, controlling the driving degree of the corresponding solenoid valve by the second driving module 120 includes: controlling the operating frequency and duty cycle of the third driving unit to drive the third power tube M3.

[0195] Of course, the driving degree of the corresponding solenoid valve by the second driving module 120 can be controlled by directly connecting the pins of the system control chip 20, and the specific control method is not limited here.

[0196] The diagnostic protection unit 133 is specifically used for:

[0197] Outputting a corresponding shutdown signal to the corresponding third driving unit 121 according to the received third over-current detection signal vb3, so that the corresponding third driving unit 121 shuts off the over-current third power tube M3;

[0198] According to the received second short-circuit detection signal vd2, the short-circuit type of the drain of the corresponding third power tube M3 is diagnosed, that is, whether the drain of the corresponding third power tube M3 has a short-circuit fault, a short-circuit fault or no short-circuit fault, and according to the short-circuit type of the drain of the corresponding third power tube M3, the second short-circuit fault signal vd4 is output to the system control chip 20 through the first SPI communication interface unit 131 to notify the system control chip 20 of the short-circuit type of the drain of the corresponding third power tube M3.

[0199] According to the received second voltage clamping signal vc2, the corresponding third power tube M3 is turned on.

[0200] Please refer to Figure 2 As a specific implementation, the second SPI communication interface unit 320 is further specifically used to: output the received second shutdown signal vd2 to the power supply module 310.

[0201] The power supply module 310 is further specifically configured to stop supplying power to the corresponding solenoid valve and the corresponding power tube path according to the second shutdown signal vd2.

[0202] The specific implementations of the second short circuit detection unit 122, the third overcurrent detection unit 123 and the second voltage clamping unit 124 are described below:

[0203] The second short circuit detection unit 122, the third overcurrent detection unit 123 and the second voltage clamping unit 124 are also connected to Figure 3 The first short circuit detection unit 113 , the second overcurrent detection unit 115 and the first voltage clamping unit 116 in the illustrated embodiment have the same circuit structure and working principle, which will not be described in detail herein.

[0204] It should be noted that, since the second driving module 120 only performs low-side driving on the solenoid valve, the working principle of the second short-circuit detection unit 122 does not include short-circuit detection when performing high-side driving on the solenoid valve.

[0205] The specific implementation of the second short circuit detection unit 122 may also include Figure 4 The second switch SW2, the second current source Isource2, the fifth comparator ap5 and the second resistor R2 in the embodiment shown in the figure are shown in the figure. Figure 4 The embodiments shown are the same and will not be described again here.

[0206] The specific implementation of the third overcurrent detection unit 123 can also be Figure 5 The second over-current detection unit 115 in the illustrated embodiment is the same and will not be described again herein.

[0207] In summary, the electronic control system provided by the embodiment of the present invention integrates M first drive modules and N second drive modules in the solenoid valve driver chip, and makes each of the first drive modules drive a corresponding solenoid valve at the high side or low side, and makes each of the second drive modules drive a corresponding solenoid valve at the low side, and M+N is greater than or equal to 14, thereby meeting the driving requirements of the solenoid valve on the basis of meeting the multifunctional driving of the solenoid valve. In addition, because the present invention does not have external discrete devices or additional independent valve driver chips, but integrates several drive modules that can meet the driving requirements of the solenoid valve in one chip, the reliability of the electronic control system is improved and the cost of the system is reduced.

[0208] Furthermore, in addition to indirectly controlling the first drive module and the second drive module through SPI communication, the system control chip also directly connects the first drive module and the second drive module through the first direct connection pin and the second direct connection pin on the solenoid valve drive chip, thereby realizing direct control of different drive modules, so that the controls of different drive modules do not interfere with each other, thereby greatly reducing the control delay of the drive module and further improving the accuracy of the solenoid valve drive.

[0209] Furthermore, by setting up a plurality of first digital filtering units and a plurality of second digital filtering units, the input end of the corresponding first driving module and the input end of the corresponding second driving module are respectively delayed filtered to filter out the glitch signal of the corresponding first driving module and the glitch signal of the corresponding second driving module respectively, thereby avoiding the system control chip from miscontrolling the first driving modules and miscontrolling the second driving modules.

[0210] Furthermore, by separately arranging the solenoid valve driving chip and the power supply chip, the heating of the power supply chip is prevented from affecting the driving accuracy of each driving module, thereby improving the driving accuracy of each driving module in the solenoid valve driving chip.

[0211] Furthermore, by providing a first short-circuit detection unit, a first overcurrent detection unit, a second overcurrent detection unit and a first voltage clamping unit in each of the first driving modules, and providing a second short-circuit detection unit, a second overcurrent detection unit, a third overcurrent detection unit and a second voltage clamping unit in each of the second driving modules, the safety performance of the solenoid valve driving chip in driving each solenoid valve is greatly improved.

[0212] Furthermore, when an overcurrent short circuit occurs in the first power tube, the second power tube and the third power tube respectively, the power supply chip stops supplying power to the driving module where the corresponding power tube is located to forcibly shut down the corresponding power tube, thereby avoiding damage to the power tube due to overcurrent short circuit.

[0213] An embodiment of the present invention further provides a wire-controlled chassis system, comprising the electronic control system.

[0214] Although the present invention is disclosed as above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the scope defined by the claims.

Claims

1. An electronic control system, characterized in that: The electronic control system is used to drive a plurality of solenoid valves, and the electronic control system includes: a solenoid valve driving chip, a system control chip and a power supply chip; The solenoid valve driving chip integrates M first driving modules, N second driving modules and a logic control module; each of the first driving modules is connected to a corresponding solenoid valve, and each of the first driving modules is used to perform high-side driving or low-side driving on the corresponding solenoid valve according to the first driving signal; each of the second driving modules is also connected to a corresponding solenoid valve, and each of the second driving modules is used to perform low-side driving on the corresponding solenoid valve according to the second driving signal; the logic control module is used to output the corresponding first driving signal to the corresponding first driving module and output the corresponding second driving signal to the corresponding second driving module according to the input driving control signal; wherein N and M are both positive integers, and N+M≥14; The system control chip is used to output M+N driving control signals to the logic control module according to external driving requirements for M+N solenoid valves; The power supply chip is used to supply power to each driving module in the solenoid valve driving chip and the system control chip through a power supply voltage.

2. The electronic control system according to claim 1, characterized in that: The system control chip is also used to directly connect to each of the first drive modules through the first direct connection pin on the solenoid valve drive chip, so as to directly control each of the first drive modules to drive the corresponding solenoid valve; and to directly connect to some of the second drive modules through the second direct connection pin on the solenoid valve drive chip, so as to directly control some of the second drive modules to drive the corresponding solenoid valve.

3. The electronic control system according to claim 2, characterized in that: Each of the first driving modules includes a first driving unit, a second driving unit, a first power tube and a second power tube; The first input end of the first driving unit and the first input end of the second driving unit are both connected to the logic control module, the second input end of the first driving unit and the second input end of the second driving unit are both connected to the corresponding first direct-connected pin, the output end of the first driving unit is connected to the gate of the first power tube, and the output end of the second driving unit is connected to the gate of the second power tube; The drain of the first power tube is connected to the power supply voltage, and the source of the first power tube is connected to the drain of the second power tube; the drain of the second power tube is also connected to the corresponding solenoid valve, and the source of the second power tube is connected to the ground.

4. The electronic control system according to claim 3, characterized in that: Each of the first driving modules further includes: a first short circuit detection unit, a first overcurrent detection unit, a second overcurrent detection unit and a first voltage clamping unit; The first short circuit detection unit is used to compare the source voltage of the first power tube, the first reference voltage and the second reference voltage to realize the short circuit diagnosis of the source of the first power tube, and output a corresponding first short circuit detection signal, and the first reference voltage is greater than the second reference voltage; The first overcurrent detection unit is used to compare the drain-source voltage of the first power tube with the overcurrent reference voltage to perform overcurrent detection on the first power tube, and output a corresponding first overcurrent detection signal according to the detection result; The second over-current detection unit is used to compare the drain voltage of the second power tube with the third reference voltage to perform over-current detection on the second power tube, and output a corresponding second over-current detection signal according to the detection result; The first voltage clamping unit is used to clamp the drain voltage of the second power tube and output a corresponding first voltage clamping signal; The logic control module is also used for: According to the input first over-current detection signal or the second over-current detection signal, the corresponding first power tube or the corresponding second power tube is turned off, and a first over-current warning signal corresponding to the first power tube or a second over-current warning signal corresponding to the second power tube is output to the system control chip; Turning on the corresponding second power tube according to the input first voltage clamping signal; and After the first power tube or the corresponding second power tube is turned off, the short circuit type of the drain of the corresponding second power tube is diagnosed according to the first short circuit detection signal, and a first short circuit fault signal is output to the system control chip.

5. The electronic control system according to claim 4, characterized in that: The system control chip is also used to perform a short circuit judgment on the drain of the corresponding second power tube according to the received first short circuit fault signal; if it is judged to be a short circuit, output a corresponding first shutdown signal to the power supply chip; The power supply chip is also used to stop supplying power to the corresponding solenoid valve according to the first shutdown signal.

6. The electronic control system according to claim 3, characterized in that: The solenoid valve driving chip also includes a plurality of first digital filtering units, the first end of each of the first digital filtering units is connected to the second input end of the corresponding first driving unit and the second input end of the corresponding second driving unit, the second end of each of the first digital filtering units is connected to the corresponding first direct connection pin, and each of the first digital filtering units is used to perform delay filtering on the corresponding first driving unit and the corresponding second driving unit according to the input first filtering control signal.

7. The electronic control system according to claim 2, characterized in that: Each of the second driving modules includes: a third driving unit and a third power tube; The first input end of the third driving unit is connected to the logic control module, the second input end of the third driving unit is connected to the corresponding second direct connection pin, and the output end of the third driving unit is connected to the gate of the third power tube; The drain of the third power tube is connected to the corresponding solenoid valve, and the source of the third power tube is connected to the ground.

8. The electronic control system according to claim 7, characterized in that: Each of the second driving modules further includes: a second short circuit detection unit, a third overcurrent detection unit and a second voltage clamping unit; The second short circuit detection unit is used to compare the drain voltage of the third power tube, the first reference voltage and the second reference voltage to implement short circuit diagnosis of the drain of the third power tube and output a corresponding second short circuit diagnosis signal, wherein the first reference voltage is greater than the second reference voltage; The third over-current detection unit is used to compare the drain voltage of the third power tube with the third reference voltage to perform over-current detection on the third power tube, and output a corresponding third over-current detection signal according to the detection result; The second voltage clamping unit is used to clamp the drain voltage of the third power tube and output a corresponding second voltage clamping signal; The logic control module is also used for: According to the input third over-current detection signal, the corresponding third power tube is turned off, and a third over-current warning signal corresponding to the third power tube is output to the system control chip; Turning on the corresponding third power tube according to the input second voltage clamping signal; and After the third power tube is turned off, the short-circuit type of the drain of the corresponding third power tube is diagnosed according to the second short-circuit detection signal, and a second short-circuit fault signal is output to the system control chip.

9. The electronic control system according to claim 8, characterized in that: The system control chip is also used to perform a short circuit judgment on the drain of the corresponding third power tube according to the received second short circuit fault signal; if it is judged to be short circuit, output a corresponding second shutdown signal to the power supply chip; The power supply chip is also used to stop supplying power to the corresponding solenoid valve according to the second shutdown signal.

10. The electronic control system according to claim 7, characterized in that: The solenoid valve driving chip also includes a plurality of second digital filtering units, the first end of each of the second digital filtering units is connected to the second input end of the corresponding third driving unit, the second end of each of the second digital filtering units is connected to the corresponding second direct connection pin, and each of the second digital filtering units is used to perform delay filtering on the corresponding third driving unit according to the input second filtering control signal.

11. The electronic control system according to claim 1, characterized in that: The solenoid valve driving chip and the power supply chip are configured as discrete structures.

12. The electronic control system according to claim 1, characterized in that: The electronic control system also includes a plurality of current detection modules, each of which corresponds to one or more solenoid valves. The current detection module is used to detect the current flowing through the corresponding solenoid valve and output the detected current information to the system control chip.

13. A wire-controlled chassis system, characterized in that: The electronic control system comprises the electronic control system according to any one of claims 1 to 12.

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