Control circuit and control method based on oil injection driving

Abstract

The invention discloses a control circuit and method based on oil injection driving. The control circuit comprises an oil injector, a main controller, a standby controller, a first isolation module, a second isolation module, a third isolation module and a fourth isolation module. The input end of the first isolation module is connected to the high side end of the main controller, the output end of the first isolation module is connected to the input end of the oil sprayer, the input end of the second isolation module is connected to the output end of the oil sprayer, and the output end of the second isolation module is connected to the low side end of the main controller. The input end of the third isolation module is connected to the high side end of the standby controller, the output end of the third isolation module is connected to the input end of the oil sprayer, the input end of the fourth isolation module is connected to the output end of the oil sprayer, and the output end of the fourth isolation module is connected to the low side end of the standby controller. The first isolation module and the second isolation module are in a connected state, and the third isolation module and the fourth isolation module are in a disconnected state.

Description

Technical Field

[0001] The present application relates to the field of control technology, and in particular to a control circuit and a control method based on fuel injection drive. Background Art

[0002] In some critical control application fields with high reliability requirements, the control system is required to maintain the normal operation of main or all functions when certain faults occur. For this purpose, hot redundancy design is usually adopted. Hot redundancy design means that the control system is equipped with two identical main and standby controllers. The main controller works normally and has complete data processing and control functions. The standby controller can process some data but does not output control signals before activation. When the main controller fails, the control system should be able to automatically switch to the standby controller for operation without affecting the normal operation of the load.

[0003] Most implementations of hot redundancy designs use a separate controller redundant switching circuit. When a main controller fails, the redundant switching circuit enters the working state, and switches the load drive control signals from the main controller to the backup controller through the relays, and the backup controller starts working. However, this hot redundancy design requires an external redundant switching circuit containing relays, and the switching has a large delay, occupies a large space and is costly. Summary of the invention

[0004] The present application provides a control circuit and a control method based on fuel injection drive, the purpose of which is to realize a primary-standby thermal redundancy design by using a fuel injection drive circuit with a thermal redundancy function module without using a redundant switching circuit.

[0005] In order to achieve the above objectives, this application provides the following technical solutions:

[0006] A control circuit based on fuel injection drive, the control circuit includes a thermal redundancy function module and a fuel injector, the thermal redundancy function module includes a main controller and a standby controller, the control circuit also includes: a first isolation module, a second isolation module, a third isolation module and a fourth isolation module;

[0007] The input end of the first isolation module is connected to the high side end of the main controller, and the output end of the first isolation module is connected to the input end of the injector;

[0008] The input end of the second isolation module is connected to the output end of the injector, and the output end of the second isolation module is connected to the low-side end of the main controller;

[0009] The input end of the third isolation module is connected to the high side end of the standby controller, and the output end of the third isolation module is connected to the input end of the injector;

[0010] The input end of the fourth isolation module is connected to the output end of the injector, and the output end of the fourth isolation module is connected to the low-side end of the standby controller;

[0011] Among them, when the main controller drives the injector to work, the first isolation module and the second isolation module are in a connected state, and the third isolation module and the fourth isolation module are in a disconnected state, so as to achieve current isolation between the main controller and the standby controller.

[0012] Optionally, when the standby controller drives the injector to work, the first isolation module and the second isolation module are in a disconnected state, and the third isolation module and the fourth isolation module are in a connected state, so as to achieve current isolation between the main controller and the standby controller.

[0013] Optionally, the first isolation module includes: a first switch tube and a first diode;

[0014] The input end of the first switch tube is connected to the high side end of the main controller, and the output end of the first switch tube is connected to the input end of the first diode;

[0015] The output end of the first diode is connected to the input end of the injector;

[0016] When the main controller drives the injector to work, the first switch tube is in a connected state, and when the standby controller drives the injector to work, the first switch tube is in a disconnected state.

[0017] Optionally, the second isolation module includes: a second switch tube and a second diode;

[0018] The input end of the second switch tube is connected to the output end of the second diode, and the output end of the second switch tube is connected to the low side end of the main controller;

[0019] The input end of the second diode is connected to the output end of the injector;

[0020] When the main controller drives the injector to work, the second switch tube is in a connected state; when the standby controller drives the injector to work, the second switch tube is in a disconnected state.

[0021] Optionally, the third isolation module includes: a third switch tube and a third diode;

[0022] The input end of the third switch tube is connected to the high side end of the standby controller, and the output end of the third switch tube is connected to the input end of the third diode;

[0023] The output end of the third diode is connected to the input end of the injector;

[0024] When the main controller drives the injector to work, the third switch tube is in a disconnected state, and when the standby controller drives the injector to work, the third switch tube is in a connected state.

[0025] Optionally, the fourth isolation module includes: a fourth switch tube and a fourth diode;

[0026] The input end of the fourth switch tube is connected to the output end of the fourth diode, and the output end of the fourth switch tube is connected to the low side end of the standby controller;

[0027] The input end of the fourth diode is connected to the output end of the injector;

[0028] When the main controller drives the injector to work, the fourth switch tube is in a disconnected state, and when the standby controller drives the injector to work, the fourth switch tube is in a connected state.

[0029] A control method based on fuel injection drive, the control method is based on the control circuit based on fuel injection drive, the control method comprises:

[0030] When the main controller drives the injector to work, a first command is sent to the first isolation module and the second isolation module, so that the first isolation module and the second isolation module are placed in a connected state;

[0031] A second command is sent to the third isolation module and the fourth isolation module to place the third isolation module and the fourth isolation module in a disconnected state.

[0032] Optionally, the control method further includes:

[0033] When the standby controller drives the injector to work, the second command is sent to the first isolation module and the second isolation module, so that the first isolation module and the second isolation module are placed in a disconnected state;

[0034] The first command is sent to the third isolation module and the fourth isolation module, so that the third isolation module and the fourth isolation module are placed in a connected state.

[0035] A storage medium includes a stored program, wherein the program is executed by a processor to execute the control method based on fuel injection drive.

[0036] A vehicle, comprising: a processor, a memory and a bus; the processor and the memory are connected via the bus;

[0037] The memory is used to store programs, and the processor is used to run programs, wherein the program executes the control method based on fuel injection drive when the processor runs it.

[0038] The control circuit provided by the present application includes an injector, a main controller, a standby controller, a first isolation module, a second isolation module, a third isolation module and a fourth isolation module. The input end of the first isolation module is connected to the high side end of the main controller, the output end of the first isolation module is connected to the input end of the injector, the input end of the second isolation module is connected to the output end of the injector, the output end of the second isolation module is connected to the low side end of the main controller, the input end of the third isolation module is connected to the high side end of the standby controller, the output end of the third isolation module is connected to the input end of the injector, the input end of the fourth isolation module is connected to the output end of the injector, and the output end of the fourth isolation module is connected to the low side end of the standby controller. When the main controller drives the injection, the first isolation module and the second isolation module are in a connected state, and the third isolation module and the fourth isolation module are in a disconnected state. The present application avoids the main controller's injection drive current from flowing to the standby controller during the reflux process, resulting in distortion of the main controller's injection modulation current waveform. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of a circuit structure of a single controller provided in an embodiment of the present application;

[0041] Figure 2 A schematic diagram of a circuit structure of a dual controller provided in an embodiment of the present application;

[0042] Figure 3 A schematic diagram of the architecture of a control circuit based on fuel injection drive provided in an embodiment of the present application;

[0043] Figure 4 A schematic diagram of another control circuit based on fuel injection drive provided in an embodiment of the present application;

[0044] Figure 5 A schematic diagram of a main-standby hot redundant dual-controller fuel injection circuit provided in an embodiment of the present application;

[0045] Figure 6A flow chart of a control method based on fuel injection drive provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0047] In this application, relational terms such as first and second, etc. are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. The terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of more restrictions, the elements defined by the sentence "comprise one..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0048] The applicant found that when a single controller (main controller or backup controller) drives the injector to work, a current return path will be generated, such as Figure 1 In the single controller shown in FIG. 1 (Q1, Q2 and Q3 represent MOS (Metal-Oxide-SemiconductorField-Effect Transistor), D1, D2 and D3 represent diodes, GND represents ground, UBAT represents battery voltage, and BOOST represents buck-boost circuit), since the injector is an inductive load, the current cannot change suddenly. In different modulation stages (for example, the 48V driving voltage provided by BOOST and the 24V driving voltage provided by UBAT), there are two return paths (including return path 1 and return path 2); return path 1 occurs in the high-side off and low-side on stage. At this time, the current flows from the injector through the MOS tube Q3 and the sampling resistor to GND, and then flows from GND through the diode D2 back to the injector. The current flow direction of return path 1 is as follows: Figure 1 Line 1 shown; return path 2 occurs during the high-side shutdown and low-side shutdown stages. At this time, the current flows from the injector through diode D3 to BOOST, flows through the BOOST capacitor to GND, and then flows from GND through diode D2 back to the injector. The current flows as shown in Figure 1 Line 2 shown.

[0049] In addition, the applicant also found that: the current return path of the dual controller (including the main controller and the standby controller) driving the injector, in addition to Figure 1 In addition to the two return paths shown for the single controller driving the injector return path 1 and return path 2, see Figure 2 As shown in FIG. 1 (Q1, Q2 and Q3 represent MOS tubes, D1, D2 and D3 represent diodes, GND represents grounding, UBAT represents battery voltage, and BOOST represents buck-boost circuit), there are four return paths in the standby controller as shown by lines 3 to 6. The reason for the generation of return path 3 is the current backflow from the high side of the main controller to the high side filter circuit of the standby controller; when return path 2 exists in the main controller, the current can flow back to the main controller BOOST and also flow back to the standby controller BOOST through return path 4; when return path 1 or 2 exists in the main controller, the current in the two return paths needs to flow through GND, and the GND of the main controller and the standby controller are connected, so part of the current will flow from the standby controller GND through the sampling resistor and the parasitic diode of the MOS tube Q3 and flow out from the low side of the fuel injection; another part of the current will flow from the standby controller GND through the diode D2 and flow out from the high side of the fuel injection.

[0050] The so-called high side refers to the power supply end in the circuit, and the so-called low side refers to the ground end in the circuit. The high side driver adds a controllable switch to the power supply end. In the field of vehicles, the high side driver is often used in the control unit of engine management. The low side driver adds a controllable switch to the ground end, which is often used for loads related to the powertrain. Generally speaking, the circuit structure of the main controller and the backup controller is the same, and both have a high side and a low side.

[0051] Based on the above-mentioned discovery of the applicant, an embodiment of the present application provides a control circuit and a control method based on injection drive, which is used to prevent the main controller's injection drive current from flowing to the standby controller during the reflux process by adding isolation modules on both the high and low sides of the controller's injection, thereby causing distortion of the main controller's injection modulation current waveform.

[0052] like Figure 3 As shown, it is a schematic diagram of the architecture of a control circuit based on fuel injection drive provided in an embodiment of the present application, including the modules shown below.

[0053] A thermal redundancy function module 100 , a fuel injector 200 , a first isolation module 300 , a second isolation module 400 , a third isolation module 500 and a fourth isolation module 600 .

[0054] The hot redundancy function module 100 includes a main controller 101 and a standby controller 102 , and the injector 200 is used to respond to commands issued by the main controller 101 or the standby controller 102 to perform corresponding injection operations.

[0055] An input end of the first isolation module 300 is connected to the high-side end of the main controller 101 , and an output end of the first isolation module 300 is connected to an input end of the injector 200 .

[0056] The input end of the second isolation module 400 is connected to the output end of the injector 200 , and the output end of the second isolation module 400 is connected to the low-side end of the main controller 101 .

[0057] An input end of the third isolation module 500 is connected to the high-side end of the standby controller 102 , and an output end of the third isolation module 500 is connected to an input end of the injector 200 .

[0058] An input end of the fourth isolation module 600 is connected to an output end of the injector 200 , and an output end of the fourth isolation module 600 is connected to a low-side end of the standby controller 102 .

[0059] When the main controller 101 drives the injector 200 to work, the first isolation module 300 and the second isolation module 400 are in a connected state, and the third isolation module 500 and the fourth isolation module 600 are in a disconnected state, so that current isolation is achieved between the main controller 101 and the standby controller 102.

[0060] It should be noted that when the main controller 101 drives the injector 200 to work, the first isolation module 300 and the second isolation module 400 are in a connected state, and the third isolation module 500 and the fourth isolation module 600 are in a disconnected state. The current in the main controller 101 can still pass through Figure 1 The return path 1 and the return path 2 shown in the figure return normally, the third isolation module 500 cuts off the return path 3 and the return path 5, and the fourth isolation module 600 cuts off the return path 4 and the return path 6. At this time, the injection drive current in the main controller 101 all flows back to the main controller 101 during the return, which is consistent with the current return path of the single controller driving the injector 200. The current of the main controller 101 will not enter the standby controller 102, and good isolation is achieved between the main and standby controllers 102.

[0061] Optionally, when the standby controller 102 drives the injector 200 to work, the first isolation module 300 and the second isolation module 400 are in a disconnected state, and the third isolation module 500 and the fourth isolation module 600 are in a connected state, so as to achieve current isolation between the main controller 101 and the standby controller 102.

[0062] It should be noted that when the standby controller 102 drives the injector 200 to work, the first isolation module 300 and the second isolation module 400 are in a disconnected state, the third isolation module 500 and the fourth isolation module 600 are in a connected state, and the current in the standby controller 102 passes through Figure 1 The return path 1 and the return path 2 shown in the figure return normally, and accordingly, the first isolation module 300 cuts off the return path 3 and the return path 5, and the second isolation module 400 cuts off the return path 4 and the return path 6. At this time, the fuel injection driving current in the standby controller 102 all flows back to the standby controller 102 during the return, which is consistent with the current return path of the single controller driving the fuel injector 200. The current of the standby controller 102 will not enter the main controller 101, and good isolation is achieved between the main and standby controllers 102.

[0063] The modules shown above can realize the drive control and current isolation of the main and standby hot redundant dual controller injection circuits without using a separate relay redundant switching circuit, thereby preventing the main controller's injection drive current from flowing to the standby controller during the reflux process, causing distortion of the main controller's injection modulation current waveform.

[0064] like Figure 4 As shown, it is a schematic diagram of the architecture of a control circuit based on fuel injection drive provided in an embodiment of the present application, including the modules shown below.

[0065] A thermal redundancy function module 100 , a fuel injector 200 , a first isolation module 300 , a second isolation module 400 , a third isolation module 500 and a fourth isolation module 600 .

[0066] The hot redundancy function module 100 includes a main controller 101 and a standby controller 102 . The main controller 101 and the standby controller 102 have the same circuit structure.

[0067] The first isolation module 300 includes a first switch tube 301 and a first diode 302. The input end of the first switch tube 301 is connected to the high side end of the main controller 101, the output end of the first switch tube 301 is connected to the input end of the first diode 302, and the output end of the first diode 302 is connected to the input end of the injector 200.

[0068] In some examples, when the main controller 101 drives the injector 200 to work, the first switch tube 301 is in a connected state, and when the standby controller 102 drives the injector 200 to work, the first switch tube 301 is in a disconnected state.

[0069] The second isolation module 400 includes a second switch tube 401 and a second diode 402, the input end of the second switch tube 401 is connected to the output end of the second diode 402, the output end of the second switch tube 401 is connected to the low side end of the main controller 101, and the input end of the second diode 402 is connected to the output end of the injector 200.

[0070] In some examples, when the main controller 101 drives the injector 200 to work, the second switch tube 401 is in a connected state, and when the standby controller 102 drives the injector 200 to work, the second switch tube 401 is in a disconnected state.

[0071] The third isolation module 500 includes a third switch tube 501 and a third diode 502. The input end of the third switch tube 501 is connected to the high side end of the standby controller 102, the output end of the third switch tube 501 is connected to the input end of the third diode 502, and the output end of the third diode 502 is connected to the input end of the injector 200.

[0072] In some examples, when the main controller 101 drives the injector 200 to work, the third switch tube 501 is in a disconnected state, and when the standby controller 102 drives the injector 200 to work, the third switch tube 501 is in a connected state.

[0073] The fourth isolation module 600 includes a fourth switch tube 601 and a fourth diode 602, the input end of the fourth switch tube 601 is connected to the output end of the fourth diode 602, the output end of the fourth switch tube 601 is connected to the low side end of the standby controller 102, and the input end of the fourth diode 602 is connected to the output end of the injector 200.

[0074] In some examples, when the main controller 101 drives the injector 200 to work, the fourth switch tube 601 is in a disconnected state, and when the standby controller 102 drives the injector 200 to work, the fourth switch tube 601 is in a connected state.

[0075] It should be noted that, in the process of the main controller 101 driving the injector 200 to work, the first switch tube 301 and the second switch tube 401 are turned on, and the third switch tube 501 and the fourth switch tube 601 are turned off. At this time, the current in the main controller 101 can still flow back normally through the return path 1 and the return path 2, the third diode 502 cuts off the return path 3, the turned-off third switch tube 501 cuts off the return path 5, the fourth diode 602 cuts off the return path 6, and the turned-off fourth switch tube 601 cuts off the return path 4. At this time, the injection driving current in the main controller 101 flows back to the main controller 101 when it flows back, which is consistent with the current return path of a single controller driving the injector 200. The current of the main controller 101 will not enter the standby controller 102, and good isolation is achieved between the main and standby controllers 102.

[0076] In addition, when the standby controller 102 drives the injector 200 to work, the first switch tube 301 and the second switch tube 401 are turned off, and the third switch tube 501 and the fourth switch tube 601 are turned on. At this time, the current in the controlled device can still flow back normally through the return path 1 and the return path 2. The first diode 302 cuts off the return path 3, the turned-off first switch tube 301 cuts off the return path 5, the second diode 402 cuts off the return path 6, and the turned-off second switch tube 401 cuts off the return path 4. At this time, the injection driving current in the standby controller 102 flows back to the standby controller 102 when it flows back, which is consistent with the current return path of a single controller driving the injector 200. The current of the standby controller 102 will not enter the main controller 101, and good isolation is achieved between the main and standby controllers 102.

[0077] In some examples, types of the first switch tube 301 , the second switch tube 401 , the third switch tube 501 , and the fourth switch tube 601 include but are not limited to PMOS tubes.

[0078] In some examples, the types of the first diode 302 , the second diode 402 , the third diode 502 , and the fourth diode 602 include, but are not limited to, diodes.

[0079] In a possible implementation, the control circuit based on the fuel injection drive can also refer to Figure 5 As shown, in Figure 5 In the circuit shown, Q4 in the main controller represents the first switch tube, Q5 in the main controller represents the second switch tube, D4 ​​in the main controller represents the first diode, D5 in the main controller represents the second diode, Q4 in the standby controller represents the third switch tube, Q5 in the standby controller represents the fourth switch tube, D4 ​​in the standby controller represents the third diode, and D5 in the standby controller represents the fourth diode.

[0080] See also Figure 5 In the circuit shown, during the fuel injection driving process, the main controller can send a command signal through the single chip microcomputer to turn on Q4 and Q5 in the main controller and keep Q4 and Q5 in the standby controller in the off state. At this time, the current in the main controller can still flow back normally through return paths 1 and 2, D4 in the standby controller cuts off return path 3, Q4 turned off in the standby controller cuts off return path 5, D5 in the standby controller cuts off return path 6, and Q5 turned off in the standby controller cuts off return path 4. At this time, the fuel injection driving current in the main controller flows back to the main controller when it flows back, which is consistent with the current return path of a single controller driving the injector. The current of the main controller will not enter the standby controller, and good isolation is achieved between the main and standby controllers.

[0081] The modules shown above, by adding switches and diodes on the high and low sides of the controller's fuel injection, prevent the main controller's fuel injection drive current from flowing to the standby controller during the reflux process, causing distortion of the main controller's fuel injection modulation current waveform. In addition, avoiding the use of a separate relay redundant switching circuit greatly reduces the delay during hot redundant switching of the main and standby controllers, reduces the occupied space, and reduces costs.

[0082] like Figure 6 As shown, it is a flow chart of a control method based on fuel injection drive provided in an embodiment of the present application. The control method is a control method provided for a control circuit based on fuel injection drive, and includes the steps shown below.

[0083] S601: When the main controller drives the injector to work, a first command is sent to the first isolation module and the second isolation module, so that the first isolation module and the second isolation module are placed in a connected state.

[0084] Among them, when the main controller drives the injector to work, it sends a first command to the first isolation module and the second isolation module, triggering the first switch tube in the first isolation module to open and the second switch tube in the second isolation module to turn off, so that the first isolation module and the second isolation module are placed in a connected state.

[0085] S602: Send a second command to the third isolation module and the fourth isolation module to place the third isolation module and the fourth isolation module in a disconnected state.

[0086] Among them, if the third isolation module and the fourth isolation module are in the disconnected state by default, there is no need to send the second command to the third isolation module and the fourth isolation module. When the third isolation module receives the second command, the third switch tube in the third isolation module is triggered to be turned off. When the fourth isolation module receives the second command, the fourth switch tube in the fourth isolation module is triggered to be turned off.

[0087] Optionally, when the standby controller drives the injector to work, a second command is sent to the first isolation module and the second isolation module to put the first isolation module and the second isolation module into a disconnected state; a first command is sent to the third isolation module and the fourth isolation module to put the third isolation module and the fourth isolation module into a connected state.

[0088] It can be understood that when the first isolation module receives the second command, it triggers the first switch tube in the first isolation module to turn off; when the second isolation module receives the second command, it triggers the second switch tube in the second isolation module to turn off; when the third isolation module receives the first command, it triggers the third switch tube in the third isolation module to turn on; when the fourth isolation module receives the first command, it triggers the fourth switch tube in the fourth isolation module to turn on.

[0089] In some examples, the first command and the second command may be issued by a MCU (Microcontroller Unit).

[0090] It should be emphasized that when the main controller drives the injector to work, the first isolation module and the second isolation module are in a connected state, and the third isolation module and the fourth isolation module are in a disconnected state, and the current in the main controller can still flow through Figure 1 The return path 1 and return path 2 shown in the figure return normally, the third isolation module cuts off the return path 3 and return path 5, and the fourth isolation module cuts off the return path 4 and return path 6. At this time, the injection drive current in the main controller all flows back to the main controller during the return, which is consistent with the current return path of the single controller driving the injector 200. The current of the main controller will not enter the standby controller, and good isolation is achieved between the main and standby controllers.

[0091] The process shown in S601-S602 above can realize the drive control and current isolation of the main and standby thermal redundant dual controller injection circuits without using a separate relay redundant switching circuit, thereby preventing the main controller's injection drive current from flowing to the standby controller during the reflux process, causing distortion of the main controller's injection modulation current waveform.

[0092] The present application also provides a computer-readable storage medium, which includes a stored program, wherein the program executes the control method based on fuel injection drive provided by the present application.

[0093] The present application also provides a vehicle, including: a processor, a memory and a bus. The processor and the memory are connected via a bus, the memory is used to store a program, and the processor is used to run the program, wherein the control method based on fuel injection drive provided by the present application is executed when the program is run.

[0094] In addition, the functions described above in the embodiments of the present application may be at least partially performed by one or more hardware logic components. For example, without limitation, exemplary types of hardware logic components that may be used include: field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), systems on chip (SOCs), complex programmable logic devices (CPLDs), and the like.

[0095] Although several specific implementation details are included in the above discussion, these should not be interpreted as limiting the scope of the present application. Certain features described in the context of a separate embodiment can also be implemented in a single embodiment in combination. On the contrary, the various features described in the context of a single embodiment can also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0096] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of disclosure involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the above disclosed concept. For example, the above features are replaced with the technical features with similar functions disclosed in this application (but not limited to) by each other to form a technical solution.

Claims

1. A control circuit based on fuel injection drive, the control circuit includes a thermal redundancy function module and a fuel injector, the thermal redundancy function module includes a main controller and a standby controller, characterized in that: The control circuit further includes: a first isolation module, a second isolation module, a third isolation module and a fourth isolation module; The input end of the first isolation module is connected to the high side end of the main controller, and the output end of the first isolation module is connected to the input end of the injector; The input end of the second isolation module is connected to the output end of the injector, and the output end of the second isolation module is connected to the low-side end of the main controller; The input end of the third isolation module is connected to the high side end of the standby controller, and the output end of the third isolation module is connected to the input end of the injector; The input end of the fourth isolation module is connected to the output end of the injector, and the output end of the fourth isolation module is connected to the low-side end of the standby controller; Among them, when the main controller drives the injector to work, the first isolation module and the second isolation module are in a connected state, and the third isolation module and the fourth isolation module are in a disconnected state, so as to achieve current isolation between the main controller and the standby controller.

2. The control circuit according to claim 1, characterized in that: When the standby controller drives the injector to work, the first isolation module and the second isolation module are in a disconnected state, and the third isolation module and the fourth isolation module are in a connected state, so that current isolation is achieved between the main controller and the standby controller.

3. The control circuit according to claim 1, characterized in that: The first isolation module includes: a first switch tube and a first diode; The input end of the first switch tube is connected to the high side end of the main controller, and the output end of the first switch tube is connected to the input end of the first diode; The output end of the first diode is connected to the input end of the injector; When the main controller drives the injector to work, the first switch tube is in a connected state, and when the standby controller drives the injector to work, the first switch tube is in a disconnected state.

4. The control circuit according to claim 1, characterized in that: The second isolation module includes: a second switch tube and a second diode; The input end of the second switch tube is connected to the output end of the second diode, and the output end of the second switch tube is connected to the low side end of the main controller; The input end of the second diode is connected to the output end of the injector; When the main controller drives the injector to work, the second switch tube is in a connected state; when the standby controller drives the injector to work, the second switch tube is in a disconnected state.

5. The control circuit according to claim 1, characterized in that: The third isolation module includes: a third switch tube and a third diode; The input end of the third switch tube is connected to the high side end of the standby controller, and the output end of the third switch tube is connected to the input end of the third diode; The output end of the third diode is connected to the input end of the injector; When the main controller drives the injector to work, the third switch tube is in a disconnected state, and when the standby controller drives the injector to work, the third switch tube is in a connected state.

6. The control circuit according to claim 1, characterized in that: The fourth isolation module includes: a fourth switch tube and a fourth diode; The input end of the fourth switch tube is connected to the output end of the fourth diode, and the output end of the fourth switch tube is connected to the low side end of the standby controller; The input end of the fourth diode is connected to the output end of the injector; When the main controller drives the injector to work, the fourth switch tube is in a disconnected state, and when the standby controller drives the injector to work, the fourth switch tube is in a connected state.

7. A control method based on fuel injection drive, characterized in that: The control method is based on the control circuit based on fuel injection drive according to any one of claims 1 to 6, and the control method includes: When the main controller drives the injector to work, a first command is sent to the first isolation module and the second isolation module, so that the first isolation module and the second isolation module are placed in a connected state; A second command is sent to the third isolation module and the fourth isolation module to place the third isolation module and the fourth isolation module in a disconnected state.

8. The method according to claim 7, characterized in that The control method further comprises: When the standby controller drives the injector to work, the second command is sent to the first isolation module and the second isolation module, so that the first isolation module and the second isolation module are placed in a disconnected state; The first command is sent to the third isolation module and the fourth isolation module, so that the third isolation module and the fourth isolation module are placed in a connected state.

9. A storage medium, characterized in that: The storage medium includes a stored program, wherein the program is executed by a processor to execute the control method based on fuel injection drive according to any one of claims 7 and 8.

10. A vehicle, characterized in that: include: processor, memory, and bus; The processor is connected to the memory via the bus; The memory is used to store programs, and the processor is used to run programs, wherein the program, when run by the processor, executes the control method based on fuel injection drive according to any one of claims 7 and 8.

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