Electronic control system and wire-controlled chassis system

Abstract

The present invention provides an electronic control system and a wire-controlled chassis system, comprising: a solenoid valve driver chip, a system control chip, and a power supply chip; the solenoid valve driver chip integrates M-way first drive modules and N-way second drive modules, each of the first drive modules high-side drive or low-side drive a corresponding solenoid valve, and each of the second drive modules low-side drive a corresponding solenoid valve, M+N being greater than or equal to 14; thereby, on the basis of satisfying the multifunctional drive of the solenoid valve, the drive requirements of the solenoid valve are met. In addition, because there are no external discrete components or additional independent valve driver chips, the reliability of the electronic control system is improved and the cost of the system is reduced. The system control chip outputs M+N drive control signals to the logic control module based on the external drive requirements for the M+N solenoid valves; the power supply chip supplies power to each first drive module in the solenoid valve driver chip and the system control chip through the power supply voltage.

Description

Technical Field

[0001] The present 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 drive-by-wire chassis technology has become a key support for the development of intelligent vehicles. The core of intelligent drive-by-wire chassis technology is to achieve precise vehicle control by replacing traditional mechanical signals with electrical signals. This technology can significantly improve vehicle safety, driving experience, and control capabilities for 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 a mainstream solution for brake-by-wire. Because the One-Box system's mechanical structure includes multiple hydraulic valves, each of which is controlled by a solenoid valve, the One-Box system's electronic control system must meet the driving requirements of a corresponding number of solenoid valves.

[0004] However, in existing One-Box electronic control systems, the solenoid valve driver chip often cannot meet the driving requirements of the solenoid valve. Therefore, manufacturers need to use external discrete components (such as diodes, transistors, resistors, and capacitors) to compensate for the shortcomings of the solenoid valve driver chip, but this will reduce the reliability of the system solution. In addition to installing discrete components, some manufacturers will also choose to install an independent valve driver chip, but this will waste some drive circuits and increase the system area, thereby increasing system costs.

[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 reliability or cost problems of the electronic control system diagram of the existing One-Box system due to the inability of the electronic control system to meet the driving requirements of the solenoid valve.

[0007] To solve the above technical problems, an embodiment of the present invention provides an electronic control system for driving 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 driver chip integrates M first driver modules, N second driver modules and a logic control module; each of the first driver modules is connected to a corresponding solenoid valve, and each of the first driver modules is used to perform high-side driving or low-side driving on the corresponding solenoid valve according to the first drive signal; each of the second driver modules is also connected to a corresponding solenoid valve, and each of the second driver modules is used to perform low-side driving on the corresponding solenoid valve according to the second drive signal; the logic control module is used to output the corresponding first drive signal to the corresponding first driver module and output the corresponding second drive signal to the corresponding second driver module according to the input drive 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 the 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 the 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-connect 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, a first reference voltage and a 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 overcurrent detection unit is used to compare the drain voltage of the second power tube with a third reference voltage to perform overcurrent detection on the second power tube, and output a corresponding second overcurrent 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] shutting down the corresponding first power tube or the corresponding second power tube according to the input first overcurrent detection signal or the second overcurrent detection signal, and outputting a first overcurrent warning signal corresponding to the first power tube or a second overcurrent warning signal corresponding to the second power tube 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 configured to determine whether the drain of the corresponding second power tube is short-circuited according to the received first short-circuit fault signal; if the drain is short-circuited, output a corresponding first shutdown signal to the power supply chip;

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

[0026] Optionally, the solenoid valve driver chip also includes several 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 driver unit and the second input end of the corresponding second driver 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 driver unit and the corresponding second driver 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 overcurrent detection unit is used to compare the drain voltage of the third power tube with a third reference voltage to perform overcurrent detection on the third power tube, and output a corresponding third overcurrent 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, shutting down the corresponding third power tube, and outputting a third over-current warning signal corresponding to the third power tube 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 configured to determine whether the drain of the corresponding third power tube is short-circuited according to the received second short-circuit fault signal; if the drain is short-circuited, output a corresponding second shutdown signal to the power supply chip;

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

[0040] Optionally, the solenoid valve driver chip also includes several second digital filtering units, the first end of each second digital filtering unit is connected to the second input end of the corresponding third driving unit, the second end of each second digital filtering unit 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 several 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, a solenoid valve driver chip integrates M first driver modules and N second driver modules. Each first driver module high-side drives or low-side drives a corresponding solenoid valve, and each second driver module low-side drives a corresponding solenoid valve, with M + N being greater than or equal to 14. This satisfies the solenoid valve's multifunctional drive requirements while also meeting them. Furthermore, because the present invention eliminates the need for external discrete components or additional independent valve driver chips, and instead integrates several driver modules capable of meeting solenoid valve drive requirements within a single chip, the reliability of the electronic control system is improved and the system cost is reduced.

[0046] Furthermore, in addition to indirectly controlling the driving of the first drive module and the second drive module through the drive 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 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, 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, because glitch signals are generated when the system control chip directly controls the corresponding driver modules via direct connection pins, a first digital filter unit is provided between the first and second driver units and the first direct connection pin to perform delay filtering on the corresponding first and second driver units; and a second digital filter unit is provided between the third driver unit and the second direct connection pin to perform delay filtering on the corresponding third driver unit, thereby preventing the system control chip from erroneously controlling the driver units due to glitch signals.

[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 driver 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 avoided 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 Schematic diagram of the circuit structure of the electronic control system provided by the embodiment of the present invention Figure 1 ;

[0053] Figure 3Schematic diagram of the circuit structure of the electronic control system provided by the embodiment of the present invention Figure 2 ;

[0054] Figure 4 Schematic diagram of the circuit structure of the electronic control system provided by the embodiment of the present invention Figure 3 ;

[0055] Figure 5 Schematic diagram of the circuit structure of the electronic control system provided by the embodiment of the present invention Figure 4 . DETAILED DESCRIPTION

[0056] The following will be combined with the accompanying 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 embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. The terms "first", "second", "third", "fourth", etc. (if any) in the description 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 numbers used in this way are interchangeable 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 variations thereof 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 explicitly listed, but may include other steps or units that are not explicitly listed or inherent to these processes, methods, products or devices.

[0057] As described in the background art, the electronic control system of the existing One-Box system cannot 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 This is 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 first driver module 110 is connected to a corresponding solenoid valve, and each first driver module 110 is used to perform high-side driving or low-side driving on the corresponding solenoid valve according to the first drive signal; each second driver module 120 is also connected to a corresponding solenoid valve, and each second driver module 120 is used to perform low-side driving 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, which 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 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 principles are as follows:

[0065] The solenoid valve driver chip 10 integrates M first driver modules 110 and N second driver modules 120. Each first driver module 110 is connected to a corresponding solenoid valve, and each first driver module 110 is used to perform high-side drive or low-side drive on the corresponding solenoid valve according to a first drive signal. Each second driver module 120 is also connected to a corresponding solenoid valve, and each second driver module 120 is used to perform low-side drive on the corresponding solenoid valve according to a second drive signal, with M+N being greater than or equal to 14. Therefore, some solenoid valves that only require low-side drive are driven by the second driver module 120, while some solenoid valves that need to change their drive state according to different application scenarios are driven by the first driver module 110, thereby meeting the multifunctional drive requirements of the solenoid valves.

[0066] Furthermore, because the total number of the first driver modules 110 and the second driver modules 120 is greater than or equal to 14, the electronic control system meets the number of solenoid valve drivers required. Furthermore, because the solenoid valve driver chip 10 does not require external discrete components or an external independent valve driver chip, the reliability of the electronic control system is improved and the system cost 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 embodiment, the solenoid valve driver chip 10 and the power supply chip 30 are separately arranged, which avoids the heat generated by the power supply chip 30 from affecting the driving accuracy of each driving module in the solenoid valve driver chip 10, thereby improving the driving accuracy of each driving module.

[0069] Figure 2 Schematic diagram of the circuit structure of the electronic control system provided by the 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 external driving requirements for M+N solenoid valves, specifically including:

[0071] Based on external drive requirements for the M+N solenoid valves, the system control chip 20 outputs M+N drive control signals va to the logic control module 130 via SPI (Serial Peripheral Interface) communication. After receiving the M+N drive control signals va, the logic control module 130 outputs M first drive signals to the corresponding M first drive modules 110 via SPI communication, and outputs N second drive signals to the corresponding N second drive modules 120 via SPI communication, thereby controlling the degree to which each drive module drives 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 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, subsequent driver module control delays can occur. In applications where frequent solenoid valve on / off operations are required, transmitting control signals via SPI communication can result in significant precision errors in the solenoid valve's operation. To address this control delay issue with SPI communication, embodiments of the present invention provide the following solutions.

[0074] Please refer to Figure 2 As a specific embodiment, 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 accuracy of the solenoid valve drive.

[0080] The system control chip 20 can perform a hybrid control of M-way first driver modules 110 and N-way second driver modules 120 using SPI communication control and pin-direct connection control, and the hybrid control ratio can be changed according to different application scenarios. For example, M is equal to 4, N is equal to 10, and the solenoid valves corresponding to the four-way first driver modules 110 are all used to control current; among the ten-way second driver modules 120, the solenoid valves corresponding to four of the second driver modules 120 are used to drive switches, and the solenoid valves corresponding to six of the second driver modules 120 are used to control current. Therefore, the system control chip 20 can be configured to perform only SPI communication control on the four-way switch-controlled second driver modules 120, while performing both SPI communication control and pin-direct connection control on the four-way current-controlled first driver modules 110 and the six-way current-controlled second driver modules 120. Of course, this is only a specific example, and the actual control method can vary depending on the application scenario and 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 glitch signal and cause erroneous control of the corresponding driving module. To solve the erroneous control problem caused by the glitch signal, the embodiment of the present invention provides the following solution.

[0082] Please refer to Figure 2 As a specific implementation, the solenoid valve driver chip 10 further integrates a plurality of first digital filter units 150 and a plurality of second digital filter 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, and the second end of each of the first digital filtering units 150 is connected to the corresponding first direct-connect pin IN1. 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 glitch signal at the input end of the corresponding first driving module 110.

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

[0085] Among them, multiple time levels can be set for the filtering delay of the first digital filtering unit 150. According to different application scenarios, the corresponding time level is selected by configuring the register to filter the input end of the corresponding first driving module 110. The number of time levels and the specific time can be set according to needs and are not limited here. The functional settings of the second digital filtering unit 160 are the same as those 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 existing digital filter circuits, specifically composed of adders, multipliers, and delays. Since the design of digital filter circuits is a common technical means in the field, they will not be described in detail here.

[0087] Please refer to Figure 2 As a specific embodiment, 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] The number of 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, thereby improving current detection accuracy. The number of 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, thereby reducing circuit costs. Of course, the configuration of the current detection modules 140 can be selected according to needs and is not limited here.

[0089] Furthermore, the current detection module 140 can be partially integrated within the solenoid valve driver chip 10 and partially implemented as a discrete component of the electronic control system. For example, the current detection module 140 for detecting the current of the solenoid valve corresponding to the first driver module 110 can be integrated within the solenoid valve driver chip 10, while the current detection module 140 for detecting the current of the solenoid valve corresponding to the second driver module 120 can be implemented as a discrete component of the electronic control system. The specific layout of the current detection module 140 can be customized based on specific 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 provided therein.

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

[0092] Please refer to Figure 2 As a specific embodiment, each first driving module 110 includes: a first driving unit 111, a second driving unit 112, a first power transistor M1, and a second power transistor 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 transistor M1, and the output end of the second driving unit 112 is connected to the gate of the second power transistor M2; the drain of the first power transistor M1 is connected to the power supply voltage VBAT, the source of the first power transistor M1 is connected to the drain of the second power transistor M2; the drain of the second power transistor M2 is also connected to the corresponding solenoid valve, and the source of the second power transistor M2 is connected to the ground.

[0093] The first drive unit 11 can both perform high-side driving of the corresponding solenoid valve through the first drive unit 111 and the first power transistor M1, and perform low-side driving of the corresponding solenoid valve through the second drive unit 112 and the second power transistor 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 controlled by the first drive 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 transistor M1 is driving the corresponding solenoid valve in the high-side mode, and when the second power transistor M2 is driving the corresponding solenoid valve in the low-side mode, both the first power transistor M1 and the second power transistor M2 may experience overcurrent. Therefore, a first overcurrent detection unit 114 is configured to compare the drain-source voltage of the first power transistor M1 with an overcurrent reference voltage to detect overcurrent in the first power transistor M1 and output a corresponding first overcurrent detection signal vb1 based on the detection result. Furthermore, a second overcurrent detection unit 115 is configured to compare the drain voltage of the second power transistor M2 with a third reference voltage VREF3 to detect overcurrent in the second power transistor M2 and output a corresponding second overcurrent detection signal vb2 based on the detection result. Upon receiving the first overcurrent detection signal vb1 or the second overcurrent detection signal vb2, the logic control module 130 outputs a shutdown signal to the first driver module with the overcurrent power transistor, causing the corresponding driver unit in the first driver module to shut down the overcurrent power transistor.

[0097] Although the logic control module 130 will shut down the first power transistor M1 or the second power transistor M2 when an overcurrent occurs, the first power transistor M1 or the second power transistor M2 may not be shut down due to a short circuit to ground or a short circuit to a power supply. Therefore, after the first power transistor M1 or the second power transistor M2 experiences an overcurrent and is shut down, the first short circuit detection unit 113 compares the drain voltage of the second power transistor M2 with the first reference voltage VREF1 and the second reference voltage VREF2, and sends a corresponding first short circuit detection signal vd1 to the logic control module 130 based on the comparison result. Based on the received first short circuit detection signal vd1, the logic control module 130 performs a short circuit diagnosis on the drain of the corresponding second power transistor M2, i.e., the output port of the first driver module 110 where the second power transistor M2 is located, and outputs a first short circuit fault signal vd3 to the system control chip 20 based on 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 a short circuit exists at the drain of the corresponding second power transistor M2, it outputs a corresponding first shutdown signal vd1 to the power supply chip 30. The power supply chip 30 is configured to stop supplying power to the corresponding solenoid valve and the corresponding power transistor path based on the first shutdown signal vd1, thereby forcibly shutting off the corresponding first power transistor M1 or the corresponding second power transistor M2, thereby preventing the corresponding first power transistor M1 or the corresponding second power transistor M2 from being unable to shut down due to an overcurrent short circuit. Of course, when the data processing module determines that a short circuit exists at the drain of the corresponding second power transistor M2, 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 based on actual needs and are not limited here.

[0099] In addition to overcurrent detection for both the first power transistor M1 and the second power transistor M2, and short-circuit detection for the output port of the first driver module where the overcurrent power transistor is located, when the solenoid valve is driven off, the drain voltage of the second power transistor M2 increases due to energy carried by the inductor in the solenoid valve. Therefore, the first voltage clamping unit 116 is configured to clamp the drain voltage of the second power transistor M2 and output a corresponding first voltage clamping signal vc1. The logic control module 130 is further configured to turn on the corresponding second power transistor M2 based on the input first voltage clamping signal vc1, thereby discharging the charge in the drain of the second power transistor M2 to ground, thereby reducing the drain voltage of the second power transistor 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 and protection unit 133;

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

[0102] The driving control unit 132 is specifically configured to:

[0103] Based on the M-way drive control signal va corresponding to the first driver module 110, a corresponding first drive signal is output to the corresponding first driver module 110 to control the driving mode and driving degree of the corresponding solenoid valve by the first driver module 110. Controlling the driving mode of the corresponding solenoid valve by the first driver module 110 includes configuring the first driver 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 driver module 110 includes controlling the operating frequency and duty cycle of the first power transistor M1 driven by the first driver unit 111, or controlling the operating frequency and duty cycle of the second power transistor M2 driven by the second driver unit 112.

[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 received 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] Based on the received first disconnection and short-circuit detection signal vd1, the disconnection and short-circuit type of the drain of the corresponding second power transistor M2 is diagnosed, that is, whether the output port of the corresponding first driver module has a disconnection and short-circuit fault. When the drain of the corresponding second power transistor M2 has a disconnection and short-circuit fault, it is determined whether an open circuit fault or a short circuit fault exists, and a first disconnection and short-circuit fault signal vd3 is output to the system control chip 20 through the first SPI communication interface unit 131 to inform the system control chip 20 of the disconnection and short-circuit type of the drain of the corresponding second power transistor 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] Converting the power supply voltage VBAT into a first power supply voltage VDD, and supplying 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 via the fourth power supply voltage Vcore, and;

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

[0117] Figure 3 Schematic diagram of the circuit structure of the electronic control system provided by the 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 embodiment shown, 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 terminal of the first operational amplifier op1 is connected to the drain of the second power tube M2 and to its own inverting input terminal, and the non-inverting input terminal of the first operational amplifier op1 is connected to a first voltage, which 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 transistor M1 is detected for a short circuit, it is turned off. If the source of the first power transistor M1 is not short-circuited, the source voltage of the first power transistor M1 will be close to ground and lower than both the first reference voltage VREF1 and the second reference voltage VREF2. Because the inverting input of the second comparator ap2 and the inverting input of the third comparator ap3 are both connected to the source of the first power transistor M1, the second comparator ap2 and the third comparator ap3 both output a high level.

[0125] If the source of the first power transistor M1 is short-circuited, the inverting inputs of the second comparator ap2 and the third comparator ap3 are both connected to the first voltage due to the virtual short of the first operational amplifier OP1. Furthermore, 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 of the second comparator ap2 and the inverting input of 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 a 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 transistor M2 is detected for a short circuit, the second power transistor M2 is turned off. If the drain of the second power transistor M2 is not short-circuited, the inverting input of the second comparator ap2 and the inverting input 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 transistor M2 is short-circuited, the inverting inputs of the second comparator ap2 and the third comparator ap3 are both connected to the first voltage due to the virtual short of the first operational amplifier OP1. Furthermore, 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 ground, the drain voltage of the second power tube M2 will be close to the ground and lower 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, regardless of whether the solenoid valve is high-side driven or low-side driven, the logic control module 130 can determine that the drain of the second power tube M2 is open circuited based on 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 transistor M2 is not short-circuited based on the high level outputs of the second comparator ap2 and the third comparator ap3. The logic control module 130 can also determine that the drain of the second power transistor M2 is short-circuited to the power supply based on the low-high level outputs of the second comparator ap2 and the third comparator ap3.

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

[0134] Of course, the connection objects of the respective non-inverting input terminals 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 embodiment shown, there are other embodiments, please refer to Figure 4 ,in, Figure 4 Schematic diagram of the circuit structure of the electronic control system provided by the 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 the chip internal power supply voltage AVDD, and a second end of the first switch SW1 is connected to the 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 transistor 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 both serve 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 detected to be short-circuited, both the first power tube M1 and the second power tube M2 are turned off.

[0145] In the first phase, the first switch SW1 is turned on and the second switch SW2 is kept off. At this stage, if the source of the first power transistor M1 is not open or short-circuited, the cathode of the first current source Isource1 is pulled down to ground by the source of the first power transistor M1, and the fourth comparator ap4 outputs a low level. If the source of the first power transistor M1 is short-circuited to the power supply, the cathode of the first current source Isource1 is connected to the power supply voltage VBAT by the source of the first power transistor M1, and the fourth comparator ap4 outputs a low level.

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

[0147] Finally, based on 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 transistor M1 is not open or short-circuited. Furthermore, based on 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 transistor 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 phase, 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 transistor M2 is not open or short-circuited, the cathode of the first current source Isource1 is connected to the power supply voltage VBAT due to the drain of the second power transistor M2, and the fourth comparator ap4 outputs a low level. If the drain of the second power transistor M2 is short-circuited to ground, the cathode of the first current source Isource1 is connected to ground due to the drain of the second power transistor M2, and the fourth comparator ap4 outputs a low level.

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

[0153] Finally, based on the low level output of the fourth comparator ap4 in the first phase and the low level output of the fifth comparator ap5 in the second phase, it is determined that the drain of the second power transistor M2 is not open or short-circuited. Furthermore, based on the low level output of the fourth comparator ap4 in the first phase and the high level output of the fifth comparator ap5 in the second phase, it is determined that the drain of the second power transistor M2 is short-circuited to 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 breaker judgment of the solenoid valve also needs to be adaptively changed, which will not be repeated here.

[0155] Regarding 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 of the first comparator ap1 is connected to the drain of the first power transistor M1, while the inverting input of the first comparator ap1 is connected to the source of the first power transistor M1 via the reference voltage source Vsource. Therefore, when the first power transistor M1 is normally conducting, the voltage at the inverting input of the first comparator ap1 is higher than the voltage at the non-inverting input, that is, the first comparator ap1 outputs a low level, indicating that the first power transistor M1 is not overcurrent. However, when the drain voltage of the first power transistor M1 drops to a level that causes the voltage at the non-inverting input of the first comparator ap1 to be higher than the voltage at the inverting input, the first comparator ap1 outputs a high level, indicating that the first power transistor M1 is overcurrent.

[0158] Of course, the connection objects of the non-inverting 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 repeated here.

[0159] Please continue to refer to Figure 3 ,exist Figure 3 In the embodiment shown, the second overcurrent 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 transistor M2, and a second end of the third resistor R3 is connected to the drain of the fourth power transistor 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 transistor 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 transistor 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 embodiment, 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. This 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, because 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 transistor 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 transistor M2 is not overcurrent. 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 transistor M2 is overcurrent.

[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 non-inverting 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 overcurrent detection unit 114 and the second overcurrent detection unit 115 are Figure 3 In addition to the embodiment shown, there are other embodiments, please refer to Figure 5 , Figure 5 Schematic diagram of the circuit structure of the electronic control system provided by the 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 transistor M5, a third current source Isource3 and a seventh comparator ap7;

[0173] The negative electrode of the third current source Isource3 is connected to the power supply voltage VBAT, and the 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 transistor 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, and the source of the fifth power tube M5 is connected to the ground terminal. The size ratio of the fifth power tube M5 to the second power tube M2 is 1 / L, where L is a positive integer. 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 will be 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 transistor M5 generate a reference voltage at the drain of the fifth power transistor M5 . The reference voltage is used to represent the drain voltage of the second power transistor M2 when the second power transistor M2 is overcurrent.

[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 embodiment shown, 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 transistor 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 transistor M2;

[0182] An input end of the buffer is connected to the second end of the fifth resistor R5 , and an output end of the buffer serves as an 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 transistor M2 exceeds the breakdown voltage of the Zener diode D1, that is, when the drain voltage of the second power transistor M2 is overvoltage, the Zener diode D1 breaks down, and the drain voltage of the second power transistor M2 is concentrated at the gate of the second power transistor M2, increasing the gate voltage of the second power transistor M2. This increase in the gate voltage of the second power transistor M2 further turns on the second power transistor M2, thereby preventing the drain voltage of the second power transistor M2 from further increasing, thereby clamping the drain voltage of the second power transistor M2. Simultaneously, the drain voltage of the second power transistor M2 is fed back to the logic control module 130 via the voltage divider circuit formed by the fifth resistor R5, the sixth resistor R6, and the buffer, so that the logic control module 130 can determine whether the drain voltage of the second power transistor M2 is overvoltage.

[0185] Please refer to Figure 2 As a specific implementation, each second driving module 120 includes: a third driving unit 121 and a third power tube M3, a first input end of the third driving unit 121 is connected to the logic control module 130, a second input end of the third driving unit 121 is connected to the first end of the second digital filtering unit 160, an output end of the third driving unit 121 is connected to the gate of the fourth power tube M4, a drain of the fourth power tube M4 is connected to the corresponding solenoid valve, and a 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] Functionally, the third overcurrent detection unit 123 is configured to compare the drain voltage of the third power transistor M3 with a third reference voltage VREF3 to detect overcurrent in the third power transistor M3 and output a corresponding third overcurrent detection signal vb3 based on the detection result. The logic control module 130 is further configured to control the corresponding third drive unit 121 to shut down the corresponding third power transistor M3 based on the input third overcurrent detection signal vb3. The second short-circuit detection unit 122 is configured to compare the drain voltage of the third power transistor M3 with the first reference voltage VREF1 and the second reference voltage VREF2 after the third power transistor M3 is shut down due to overcurrent to diagnose whether the drain of the corresponding third power transistor M3 is short-circuited and output a corresponding second short-circuit diagnosis signal vd2 to the logic control module 130. The logic control module 130 is further configured to diagnose the short-circuit type of the drain of the corresponding third power transistor M3 based on the second short-circuit detection signal vd2 and output a second short-circuit fault signal vd4 to the system control chip 20. The data processing module of the system control chip 20 is further configured to output a corresponding second shutdown signal vd2 to the power supply chip 30 when, based on the second short-circuit fault signal vd4, it is determined that a short circuit exists at the drain of the corresponding third power transistor M3. The power supply chip 30 is further configured to stop supplying power to the corresponding solenoid valve and power transistor circuit based on the second shutdown signal vd2, thereby preventing the corresponding third power transistor M3 from being unable to shut down due to an overcurrent short circuit.

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

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

[0193] The driving control unit 132 is specifically configured to:

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

[0198] Based on the received second short-circuit detection signal vd2, the short-circuit type of the drain of the corresponding third power transistor M3 is diagnosed, that is, whether the drain of the corresponding third power transistor M3 has a short-circuit fault, a short-circuit fault, or no short-circuit fault. Based on the short-circuit type of the drain of the corresponding third power transistor M3, a second short-circuit fault signal vd4 is output to the system control chip 20 through the first SPI communication interface unit 131 to inform the system control chip 20 of the short-circuit type of the drain of the corresponding third power transistor 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 configured 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 following describes the specific implementations of the second short circuit detection unit 122, the third overcurrent detection unit 123, and the second voltage clamping unit 124.

[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 are similar to those in the embodiment shown in FIG. 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 the same as Figure 5 The second over-current detection unit 115 in the illustrated embodiment is the same and will not be described again here.

[0207] In summary, the electronic control system provided by the embodiments of the present invention meets the driving requirements of the solenoid valves while satisfying the multifunctional driving requirements of the solenoid valves by integrating M first drive modules and N second drive modules within a solenoid valve driver chip, enabling each first drive module to high-side drive or low-side drive a corresponding solenoid valve, and enabling each second drive module to low-side drive a corresponding solenoid valve, with M + N being greater than or equal to 14. Furthermore, because the present invention does not require external discrete components or an additional independent valve driver chip, but instead integrates multiple drive modules capable of meeting the driving requirements of the solenoid valves within a single chip, the reliability of the electronic control system is improved and the system cost 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 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 accuracy of the solenoid valve drive.

[0209] Furthermore, by providing a plurality of first digital filtering units and a plurality of second digital filtering units, delay filtering is performed on the input ends of the corresponding first driving modules and the input ends of the corresponding second driving modules, respectively, so as to filter out the glitch signals of the corresponding first driving modules and the glitch signals of the corresponding second driving modules, thereby avoiding the system control chip from erroneously controlling the first driving modules and 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 avoided 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 driver chip in driving each solenoid valve is greatly improved.

[0212] Furthermore, when an overcurrent short circuit occurs in each of the first power tube, the second power tube and the third power tube, the power supply chip stops supplying power to the driving module where the corresponding power tube is located, so as 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 scope of protection of the present invention should be based on 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 driver chip integrates M first driver modules, N second driver modules and a logic control module; each of the first driver modules is connected to a corresponding solenoid valve, and each of the first driver modules is used to perform high-side driving or low-side driving on the corresponding solenoid valve according to the first drive signal; each of the second driver modules is also connected to a corresponding solenoid valve, and each of the second driver modules is used to perform low-side driving on the corresponding solenoid valve according to the second drive signal; the logic control module is used to output the corresponding first drive signal to the corresponding first driver module and output the corresponding second drive signal to the corresponding second driver module according to the input drive 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 drive module in the solenoid valve drive chip and the system control chip through a power supply voltage; 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 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 to directly control some of the second drive modules to drive the corresponding solenoid valve.

2. The electronic control system according to claim 1, 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-connect 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.

3. The electronic control system according to claim 2, 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 with a first reference voltage and the source voltage of the first power tube with a second reference voltage, respectively, 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; The first overcurrent detection unit is used to compare the drain-source voltage of the first power tube with an 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 overcurrent detection unit is used to compare the drain voltage of the second power tube with a third reference voltage to perform overcurrent detection on the second power tube, and output a corresponding second overcurrent 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: shutting down the corresponding first power tube or the corresponding second power tube according to the input first overcurrent detection signal or the second overcurrent detection signal, and outputting a first overcurrent warning signal corresponding to the first power tube or a second overcurrent warning signal corresponding to the second power tube 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.

4. The electronic control system according to claim 3, characterized in that: The system control chip is further configured to determine whether the drain of the corresponding second power tube is short-circuited according to the received first short-circuit fault signal; if the drain is short-circuited, output a corresponding first shutdown signal to the power supply chip; The power supply chip is further configured to stop supplying power to the corresponding solenoid valve according to the first shutdown signal.

5. The electronic control system according to claim 2, characterized in that: The solenoid valve driver chip also includes several 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 driver unit and the second input end of the corresponding second driver 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 driver unit and the corresponding second driver unit according to the input first filtering control signal.

6. The electronic control system according to claim 1, 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.

7. The electronic control system according to claim 6, 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 with the first reference voltage and the drain voltage of the third power tube with the second reference voltage, respectively, to implement short-circuit diagnosis of the drain of the third power tube and output a corresponding second short-circuit diagnosis signal, the first reference voltage being greater than the second reference voltage; The third overcurrent detection unit is used to compare the drain voltage of the third power tube with a third reference voltage to perform overcurrent detection on the third power tube, and output a corresponding third overcurrent 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, shutting down the corresponding third power tube, and outputting a third over-current warning signal corresponding to the third power tube 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.

8. The electronic control system according to claim 7, characterized in that: The system control chip is further configured to determine whether the drain of the corresponding third power tube is short-circuited according to the received second short-circuit fault signal; if the drain is short-circuited, output a corresponding second shutdown signal to the power supply chip; The power supply chip is further configured to stop supplying power to the corresponding solenoid valve according to the second shutdown signal.

9. The electronic control system according to claim 6, characterized in that: The solenoid valve driver chip also includes several second digital filtering units, the first end of each second digital filtering unit is connected to the second input end of the corresponding third driver unit, the second end of each second digital filtering unit 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 driver unit according to the input second filtering control signal.

10. 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.

11. The electronic control system according to claim 1, characterized in that: The electronic control system also includes several 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.

12. 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 11.

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