Control circuit and control method based on fuel injection drive

Abstract

The present application discloses a control circuit and a control method based on fuel injection drive, wherein the control circuit includes a fuel 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 fuel injector, the input end of the second isolation module is connected to the output end of the fuel 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 fuel injector, the input end of the fourth isolation module is connected to the output end of the fuel 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 fuel 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.

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 certain critical control applications with high reliability requirements, the control system must maintain normal operation of key or all functions even in the event of certain faults. To achieve this, a hot redundancy design is often employed. Hot redundancy involves equipping the control system with two identical primary and backup controllers. The primary controller operates normally, providing complete data processing and control functions, while the backup controller can process some data but does not output control signals until activated. If the primary controller fails, the control system should be able to automatically switch to the backup controller without affecting normal load operation.

[0003] Most implementations of hot redundancy designs use a separate controller redundancy switching circuit. When the main controller fails, the redundant switching circuit enters the working state, and switches the load's 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, which has a large switching 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 master-slave 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 comprising a thermal redundancy function module and a fuel injector, the thermal redundancy function module comprising a main controller and a backup controller, the control circuit further comprising: 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] 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 that current isolation is achieved 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 operate, the first switch tube is in a connected state; when the standby controller drives the injector to operate, 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 operate, the third switch tube is in a disconnected state; when the standby controller drives the injector to operate, 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; 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 includes:

[0030] When the main controller drives the injector to work, it sends a first command 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 operate, the standby controller sends the second command 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 comprises: a processor, a memory, and a bus; the processor and the memory are connected via the bus;

[0037] The memory is used to store a program, and the processor is used to run the program, wherein the program is executed by the processor to execute the control method based on fuel injection driving.

[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 by adding isolation modules to both the high side and the low side of the controller's injection. This causes the main controller's injection modulation current waveform to be distorted. 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 following briefly introduces the drawings required for use in the embodiments or the description of the prior art. 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 any creative work.

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

[0041] Figure 2 A schematic diagram of the 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 the architecture 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 primary / 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 this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0047] In this application, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. The terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or apparatus comprising the element.

[0048] The applicant found that when a single controller (main controller or standby controller) drives the injector to work, a current return path will be generated, such as Figure 1 In the single controller shown (Q1, Q2, and Q3 represent MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) tubes, D1, D2, and D3 represent diodes, GND represents ground, UBAT represents battery voltage, and BOOST represents buck-boost circuit), because the injector is an inductive load and the current cannot change suddenly, there are two return paths (including return path 1 and return path 2) in different modulation stages (for example, the 48V drive voltage provided by BOOST and the 24V drive voltage provided by UBAT); return path 1 occurs during the high-side shutdown and low-side opening phase. 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 diode D2 back to the injector. The current flow direction of return path 1 is as follows Figure 1 The line 1 shown in the figure; the return path 2 occurs in the high-side shutdown and low-side shutdown stages. At this time, the current flows from the injector through the diode D3 to the BOOST, flows through the BOOST capacitor to GND, and then flows from GND through the diode D2 back to the injector. The current flows as shown in the figure. 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 the figure (Q1, Q2, and Q3 represent MOS transistors, D1, D2, and D3 represent diodes, GND represents ground, 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. Return path 3 is caused by the backflow of current from the high-side of the main controller to the high-side filter circuit of the standby controller. Return path 4 occurs when return path 2 exists in the main controller. Current can flow back to the main controller BOOST or to the standby controller BOOST through return path 4. Return paths 5 and 6 occur when return path 1 or 2 exists in the main controller. The current in both return paths needs to flow through GND. Since the GNDs of the main and standby controllers are connected, some current flows from the standby controller GND through the sampling resistor and the parasitic diode of MOS transistor Q3 and out of the low-side injector. Another part of the current flows from the standby controller GND through diode D2 and out of the high-side injector.

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

[0051] Based on the above-mentioned findings 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 return 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 , which 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] Thermal redundancy function module 100 , fuel injector 200 , first isolation module 300 , second isolation module 400 , third isolation module 500 and fourth isolation module 600 .

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

[0055] An input end of the first isolation module 300 is connected to the high-side terminal 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] An input end of the second isolation module 400 is connected to an output end of the injector 200 , and an output end of the second isolation module 400 is connected to a low-side end of the main controller 101 .

[0057] An input end of the third isolation module 500 is connected to the high-side terminal 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 Return paths 1 and 2 are shown as returning normally. The third isolation module 500 blocks return paths 3 and 5, and the fourth isolation module 600 blocks return paths 4 and 6. At this point, the fuel injection drive current in the main controller 101 flows entirely back to the main controller 101, consistent with the current return path of a single controller driving the fuel injector 200. Current from the main controller 101 does not flow into the backup controller 102, achieving good isolation between the main and backup 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 Return paths 1 and 2 are shown as returning normally. Accordingly, the first isolation module 300 cuts off return paths 3 and 5, and the second isolation module 400 cuts off return paths 4 and 6. At this point, the fuel injection drive current in the backup controller 102 flows entirely back to the backup controller 102, consistent with the current return path of a single controller driving the injector 200. Current from the backup controller 102 does not enter the main controller 101, achieving good isolation between the main and backup controllers 102.

[0063] The modules shown above can realize the drive control and current isolation of the main and standby thermally redundant dual-controller injection circuits without using a separate relay redundant switching circuit, thereby avoiding the main controller's injection drive current flowing to the standby controller during the return process, causing the main controller's injection modulation current waveform to be distorted.

[0064] like Figure 4 , which 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] Thermal redundancy function module 100 , fuel injector 200 , first isolation module 300 , second isolation module 400 , third isolation module 500 and 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. 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. 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 when the main controller 101 is driving the injector 200, the first switch 301 and the second switch 401 are turned on, and the third switch 501 and the fourth switch 601 are turned off. At this point, the current in the main controller 101 can still flow back normally through return paths 1 and 2. The third diode 502 blocks return path 3, the turned-off third switch 501 blocks return path 5, the fourth diode 602 blocks return path 6, and the turned-off fourth switch 601 blocks return path 4. At this point, the fuel injection driving current in the main controller 101 flows back to the main controller 101, consistent with the current return path when a single controller drives the injector 200. Current from the main controller 101 does not flow into the backup controller 102, achieving good isolation between the main and backup controllers 102.

[0076] Furthermore, while the backup controller 102 is driving the injector 200, the first and second switching transistors 301 and 401 are turned off, and the third and fourth switching transistors 501 and 601 are turned on. At this point, the current within the controlled device can still flow back normally through return paths 1 and 2. The first diode 302 blocks return path 3, the turned-off first switching transistor 301 blocks return path 5, the second diode 402 blocks return path 6, and the turned-off second switching transistor 401 blocks return path 4. At this point, the injection driving current in the backup controller 102 flows entirely back to the backup controller 102, consistent with the current return path when a single controller drives the injector 200. The current in the backup controller 102 does not enter the main controller 101, achieving good isolation between the main and backup controllers 102.

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

[0078] In some examples, the first diode 302 , the second diode 402 , the third diode 502 , and the fourth diode 602 may be, 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 injection drive process, the main controller can issue a command signal through the microcontroller to turn on Q4 and Q5 in the main controller and keep Q4 and Q5 in the standby controller off. At this point, the current in the main controller can still flow normally through return paths 1 and 2. D4 in the standby controller interrupts return path 3, the off Q4 in the standby controller interrupts return path 5, D5 in the standby controller interrupts return path 6, and the off Q5 in the standby controller interrupts return path 4. At this point, the injection drive current in the main controller flows back to the main controller, consistent with the current return path of a single controller driving an injector. Current from the main controller does not enter the standby controller, achieving good isolation between the main and standby controllers.

[0081] The modules shown above, by adding switches and diodes to the high and low sides of the controller's fuel injection, prevent the main controller's fuel injection drive current from flowing to the backup controller during the return process, resulting in distortion of the main controller's fuel injection modulation current waveform. In addition, the use of a separate relay redundant switching circuit is avoided, greatly reducing the delay during hot redundancy switching between the main and backup controllers, reducing occupied space, and lowering 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 following steps.

[0083] S601: When the main controller drives the injector to work, it sends a first command 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 turn off. When the fourth isolation module receives the second command, the fourth switch tube in the fourth isolation module is triggered to turn 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 place the first isolation module and the second isolation module in a disconnected state; a first 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 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 microcontroller unit (MCU).

[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 Return paths 1 and 2 are shown as returning normally. The third isolation module cuts off return paths 3 and 5, and the fourth isolation module cuts off return paths 4 and 6. At this point, the fuel injection drive current in the main controller flows back to the main controller, consistent with the current return path of a single controller driving injector 200. Current from the main controller does not flow into the backup controller, achieving good isolation between the main and backup 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 avoiding the main controller's injection drive current flowing to the standby controller during the return process, causing the main controller's injection modulation current waveform to be distorted.

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

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

[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, and 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 chips (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 construed as limiting the scope of this application. Certain features described in the context of separate embodiments may also be implemented in combination in a single embodiment. Conversely, various features described in the context of a single embodiment may also be implemented in multiple embodiments individually or in any suitable sub-combination.

[0096] The above description is merely a preferred embodiment of the present application and an illustration of the technical principles employed. Those skilled in the art should understand that the scope of disclosure in this application is not limited to the technical solutions formed by a specific combination of the above-mentioned technical features, but also encompasses other technical solutions formed by any combination of the above-mentioned technical features or their equivalents without departing from the above-mentioned disclosed concepts. For example, a technical solution formed by replacing the above-mentioned features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A control circuit based on fuel injection drive, the control circuit comprising a thermal redundancy function module and a fuel injector, the thermal redundancy function module comprising a main controller and a backup 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 that current isolation is achieved between the main controller and the standby controller; 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.

2. The control circuit according to claim 1, wherein: 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 operate, the first switch tube is in a connected state; when the standby controller drives the injector to operate, the first switch tube is in a disconnected state.

3. The control circuit according to claim 1, wherein: 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.

4. The control circuit according to claim 1, wherein: 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 operate, the third switch tube is in a disconnected state; when the standby controller drives the injector to operate, the third switch tube is in a connected state.

5. The control circuit according to claim 1, wherein: 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; when the standby controller drives the injector to work, the fourth switch tube is in a connected state.

6. 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 5, and the control method includes: When the main controller drives the injector to work, it sends a first command 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; Sending 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; When the standby controller drives the injector to operate, the standby controller sends the second command 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.

7. A storage medium, characterized in that: The storage medium includes a stored program, wherein the program is executed by the processor to execute the control method based on fuel injection driving according to claim 6.

8. 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 a program, and the processor is used to run the program, wherein the program is executed by the processor to execute the control method based on fuel injection drive according to claim 6.

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