Spark ignition engine degraded starting method and device, vehicle and storage medium

Abstract

This application relates to a spark-ignition engine downgrade start method and apparatus, a vehicle, and a storage medium in the field of engine technology. The spark-ignition engine downgrade start method includes: obtaining engine speed and starting temperature; detecting whether a post-throttle manifold pressure sensor is functioning properly; if the post-throttle manifold pressure sensor is not functioning properly, searching a preset manifold pressure map based on the engine speed and starting temperature to determine a base manifold pressure value; and using the base manifold pressure value as a substitute intake manifold pressure value to control engine start. The downgrade start method of this application improves the accuracy of the substitute intake manifold pressure value in a fault-downgrade mode by presetting and self-learning the intake manifold pressure, thereby achieving an engine downgrade start.

Description

Technical Field

[0001] The present application relates to the field of engine technology, and in particular to a method and device for starting a spark-ignition engine with degraded start-up, a vehicle, and a storage medium. Background Art

[0002] Spark ignition engines are generally controlled by a throttle, injection valve and ignition coil. Its control architecture is to calculate the required throttle opening based on the engine's required torque, and control the actual intake volume (air) after controlling the throttle to reach the required opening. At the same time, the required fuel injection volume is calculated based on the actual intake volume and the required air-fuel ratio, and the fuel is injected through the injection valve. The air and fuel are mixed and enter each cylinder and finally ignited and burned by the ignition coil to produce work.

[0003] Among them, the calculation of the actual intake volume requires the participation of the intake manifold pressure. However, in actual application, when the intake manifold pressure fails, the actual intake volume calculation at engine start-up is inaccurate due to the inappropriate setting of the intake manifold pressure substitute value, which leads to inaccurate calculation of the fuel injection amount, and then causes difficulties in starting the engine or even failure to start. Summary of the Invention

[0004] In view of the problems existing in the background technology, the present application provides a method and device for starting a spark-ignition engine with degradation, a vehicle and a storage medium. The method for starting a spark-ignition engine with degradation improves the accuracy of the intake manifold pressure substitute value in the fault degradation mode by presetting and self-learning the intake manifold pressure, thereby achieving engine degradation starting.

[0005] According to one aspect of the present invention, a method for degraded starting of a spark-ignition engine is provided, comprising: obtaining an engine speed and a starting temperature; detecting whether a post-throttle manifold pressure sensor is operating normally; if the post-throttle manifold pressure sensor is not operating normally, searching a preset manifold pressure map based on the engine speed and the starting temperature to determine a manifold pressure base value; and controlling the engine start by using the manifold pressure base value as a substitute value for the intake manifold pressure.

[0006] In some embodiments of the present invention, the engine operating parameters obtained also include throttle opening. When the post-throttle manifold pressure sensor does not work normally, the preset CURVE curve is searched according to the throttle opening to determine the manifold pressure correction value; when the engine is started, the intake manifold pressure substitute value adopts the sum of the manifold pressure correction value and the manifold pressure base value.

[0007] In some embodiments of the present invention, the starting temperature adopts the minimum value among the ambient temperature, the engine water temperature and the intake air temperature.

[0008] In some embodiments of the present invention, if the post-throttle manifold pressure sensor operates normally, the value obtained by the post-throttle manifold pressure sensor is used to control the engine start.

[0009] In some embodiments of the present invention, if the throttle post-manifold pressure sensor operates normally, the start success status is set and there are no start-related faults, the engine speed, starting temperature and the values ​​obtained by the throttle post-manifold pressure sensor are written to the corresponding positions in the preset manifold pressure pulse spectrum table, and the preset manifold pressure pulse spectrum table is updated.

[0010] In some embodiments of the present invention, the manifold pressure map table is stored in an EEPROM of an ECU of the spark ignition engine.

[0011] In some embodiments of the present invention, if the throttle post-manifold pressure sensor operates normally, but the startup success status is not set and / or there is a startup-related fault, the recorded value obtained by the throttle post-manifold pressure sensor is discarded and the preset manifold pressure pulse spectrum table is not updated.

[0012] According to a second aspect of the present invention, a spark-ignition engine degraded starting device is provided, comprising: a manifold pressure determination module for collecting actual manifold pressure; a manifold pressure sensor working state determination module for determining whether the manifold pressure sensor is operating normally; an engine speed determination module for collecting engine speed; a starting temperature determination module for collecting starting temperature; a throttle opening determination module for collecting throttle opening; a first storage module for storing a preset manifold pressure map; a second storage module for storing a preset CURVE curve; and a control module for, when the post-throttle manifold pressure sensor is not operating normally, searching the preset manifold pressure map based on the engine speed and the starting temperature to determine a manifold pressure base value, searching the preset CURVE curve based on the throttle opening to determine a manifold pressure correction value, calculating an intake manifold pressure substitute value based on the manifold pressure base value and the manifold pressure correction value, and controlling engine starting using the intake manifold pressure substitute value.

[0013] According to a third aspect of the present invention, a vehicle is provided, comprising: at least one processor and a memory; the memory storing computer-executable instructions; the at least one processor executing the computer-executable instructions stored in the memory, so that the at least one processor performs the above-mentioned spark-ignition engine degraded starting method.

[0014] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, wherein the computer-readable storage medium stores computer-executable instructions, and when a processor executes the computer-executable instructions, the above-mentioned spark-ignition engine degraded starting method is implemented.

[0015] By using the spark-ignition engine degraded starting method in the present technical solution, the manifold pressure base value and correction value are preset according to characteristic parameters affecting engine starting, such as engine speed, starting temperature, throttle opening, etc. At the same time, after the engine is put into use, the manifold pressure base value is self-learned during each normal start-up, and the credibility of the newly learned value is checked. After the check is passed, the preset manifold pressure pulse spectrum table is automatically updated, thereby improving the effectiveness of the intake manifold pressure substitute value. In the event of a fault in the manifold pressure sensor, it is ensured that the manifold pressure value used to calculate the intake flow and gas flow reflects the pressure change trend during the starting process to the maximum extent, thereby ensuring the accuracy of the intake flow calculation in the fault mode, and further ensuring the smooth start of the engine in the intake manifold pressure sensor fault degradation mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0017] Figure 1 is a flow chart of a spark-ignition engine degraded starting method provided by an embodiment of the present invention;

[0018] Figure 2 It is a schematic diagram of the spark ignition engine degradation starting device provided by the present invention. DETAILED DESCRIPTION

[0019] It should be clear that 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 work are within the scope of protection of this application.

[0020] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with certain aspects of the present application, as detailed in the appended claims.

[0021] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0022] The following describes the spark ignition engine degraded starting method and device, vehicle and storage medium provided in the embodiments of the present application with reference to the accompanying drawings.

[0023] An embodiment of the present application discloses a method for starting a spark-ignition engine with a downgraded start. The method for starting a spark-ignition engine provided in this embodiment is applied to a spark-ignition engine, which may be a gasoline engine. The present invention does not impose any restrictions on this. The executor of the method for starting a spark-ignition engine with a downgraded start provided in this embodiment may be an electronic control unit (ECU).

[0024] Figure 1 Flowchart of the spark ignition engine degraded start method provided by an embodiment of the present invention. Figure 1 As shown, the spark ignition engine degraded starting method of this embodiment includes the following steps:

[0025] S10: Establishing a preset manifold pressure spectrum table and a preset CURVE curve.

[0026] A manifold pressure map (MAP) table is preset. A map table reflects the relationship between two engine parameters and another parameter and is typically plotted as a three-dimensional graph. For example, inputs X and Y produce a corresponding value Z. In this embodiment, the coordinate axes of the preset MAP table are engine speed and starting temperature. A CURVE curve is also preset, a one-dimensional array. For example, inputs X produce a corresponding value Y. In this embodiment, the coordinate axis of the preset CURVE curve is the actual throttle opening.

[0027] In practical applications, the preset manifold pressure map and preset CURVE curve in this embodiment can be calibrated in a laboratory through engine bench testing. Furthermore, the preset manifold pressure map and preset CURVE curve are stored in the EEPROM of the spark-ignition engine's ECU. EEPROM is an electrically erasable programmable read-only memory (EEPROM), a storage chip that maintains data even after a power outage.

[0028] S20: Obtain engine operating parameters.

[0029] The engine operating parameters obtained include engine speed, starting temperature, throttle opening, throttle front intake pressure, etc.

[0030] Among them, the starting temperature is the temperature when the engine starts. The starting temperature must take into account the most stringent starting conditions. At different starting temperatures, the engine's friction resistance and combustion state are different, and the required throttle opening and fuel amount at startup are different. Specifically, in this embodiment, the starting temperature takes the minimum value of the ambient temperature, engine water temperature and intake temperature.

[0031] S30: Check whether the throttle post-manifold pressure sensor is working properly.

[0032] Specifically, it is possible to detect whether the throttle post-manifold pressure sensor is missing or damaged; if the throttle post-manifold pressure sensor is missing or damaged, it is determined that the throttle post-manifold pressure sensor is not working properly; if the throttle post-manifold pressure sensor is not missing and not damaged, it is determined that the throttle post-manifold pressure sensor is working properly.

[0033] In addition, when the post-throttle manifold pressure sensor is not missing and not damaged, the operating parameters acquired in step S20 also include the actual post-throttle manifold pressure and the engine startup success status.

[0034] S40: Determine the manifold pressure value.

[0035] When the post-throttle manifold pressure sensor does not work properly, the preset manifold pressure pulse spectrum table is searched based on the engine speed and starting temperature to determine the manifold pressure base value; the manifold pressure base value is used as an alternative value for the intake manifold pressure to control engine starting.

[0036] Furthermore, when the post-throttle manifold pressure sensor does not work properly, the preset CURVE curve is searched according to the throttle opening to determine the manifold pressure correction value; when the engine is started, the intake manifold pressure substitute value uses the sum of the manifold pressure correction value and the manifold pressure base value, which can further improve the accuracy of the intake manifold pressure substitute value.

[0037] By using the spark-ignition engine degraded starting method in the present technical solution, considering that the intake manifold pressure is a dynamic value during the engine starting process, if a fixed substitute value is used to standardize the intake manifold pressure in the fault mode, it will cause starting difficulties or failures. Compared with the current method of directly using a fixed substitute value to standardize the current intake manifold pressure when the intake manifold pressure sensor fails, the present invention first presets the intake manifold pressure base value and correction value based on relevant characteristic parameters affecting the engine starting process, such as engine speed, starting temperature, throttle opening, etc., and improves the accuracy of the intake manifold pressure substitute value in the fault degradation mode by presetting and self-learning the intake manifold pressure, thereby realizing engine degraded starting.

[0038] In addition, during normal operation after the engine is successfully started, if the intake manifold pressure sensor fails, the intake manifold pressure can be estimated by the intake pressure before the throttle and the throttle opening, thereby achieving engine downgrade operation.

[0039] When the post-throttle manifold pressure sensor operates normally, when the engine is started, the manifold pressure value directly adopts the value obtained by the post-throttle manifold pressure sensor.

[0040] In addition, when the throttle manifold pressure sensor is working normally, if the start success status is set and there is no start-related fault, the engine speed, starting temperature and the values ​​obtained by the throttle manifold pressure sensor can be written into the corresponding positions in the preset manifold pressure pulse spectrum table. Specifically, it can be written according to the real-time recorded values ​​according to the difference calculation method of the approximate coordinate axes, and the preset manifold pressure pulse spectrum table is updated and stored in the EEPROM (electrically erasable programmable read-only memory) when the power is turned off.

[0041] Taking into account the differences in actual engine application and component aging, the preset manifold pressure pulse spectrum table is continuously optimized by self-learning the intake manifold pressure substitute value each time the engine is started, thereby improving the accuracy of the intake manifold pressure substitute value.

[0042] Furthermore, the newly learned values ​​can also be verified for credibility. After the verification is passed, the manifold pressure pulse spectrum table is automatically updated, thereby improving the effectiveness of the intake manifold pressure substitute value, ensuring that the manifold pressure value used to calculate the air intake volume and gas volume when the intake manifold pressure sensor fails reflects the pressure change trend during the startup process to the maximum extent, thereby ensuring the accuracy of the intake flow calculation in the fault degradation mode, and further ensuring the smooth startup of the engine in the intake manifold pressure sensor fault degradation mode.

[0043] It should be noted that when the post-throttle manifold pressure sensor operates normally, but the start success status is not set and / or there is a start-related fault, the actual manifold pressure obtained by the post-throttle manifold pressure sensor and the obtained engine speed and starting temperature are abandoned from being updated to the preset manifold pressure map.

[0044] The present application also provides a spark-ignition engine degraded starting device, which corresponds to the above-mentioned method embodiment. The spark-ignition engine degraded starting device uses the above-mentioned spark-ignition engine degraded starting method to start a spark-ignition engine such as a gasoline engine or a kerosene engine when the post-throttle manifold pressure sensor fails to work properly. Figure 2 This is a schematic diagram of the spark ignition engine degraded starting device provided by the present invention. Figure 2 As shown, the degradation start device 200 includes:

[0045] The manifold pressure determination module 201 is configured to collect actual manifold pressure.

[0046] The manifold pressure sensor working state determination module 202 is used to determine whether the manifold pressure sensor is working normally, that is, whether the manifold pressure determination module is normally collecting the actual manifold pressure.

[0047] The engine speed determination module 203 is used to collect the engine speed.

[0048] The startup temperature determination module 204 is configured to collect the startup temperature.

[0049] The throttle opening determination module 205 is used to collect the throttle opening.

[0050] The first storage module 206 is configured to store a preset manifold pressure map.

[0051] The second storage module 207 is configured to store a preset CURVE curve.

[0052] The control module 208 searches a preset manifold pressure spectrum table according to the engine speed and starting temperature to determine a manifold pressure base value when the post-throttle manifold pressure sensor does not operate normally, searches a preset CURVE curve according to the throttle opening to determine a manifold pressure correction value, calculates a manifold pressure substitute value according to the manifold pressure base value and the manifold pressure correction value, and uses the manifold pressure substitute value to control engine starting.

[0053] An embodiment of the present application also proposes a vehicle, which includes a processor and a memory; wherein the memory is used to store computer-executable instructions; the processor is used to execute the computer-executable instructions stored in the memory to implement the various steps performed by the ECU in the above embodiment; for details, please refer to the relevant description in the above method embodiment.

[0054] In one possible design, the memory can be either independent or integrated with the processor.

[0055] When the memory is independently provided, the vehicle further includes a bus for connecting the memory and the processor.

[0056] The embodiment of the present application further provides a computer-readable storage medium, in which computer-executable instructions are stored. When a processor executes the computer-executable instructions, the above-mentioned spark-ignition engine degraded starting method is implemented.

[0057] In the several embodiments provided herein, it should be understood that the disclosed vehicles and methods can be implemented in other ways. For example, the vehicle embodiments described above are merely illustrative. For example, the module division is merely a logical functional division. In actual implementation, there may be other division methods, such as multiple modules being combined or integrated into another system, or some features being ignored or not implemented. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or module, which may be electrical, mechanical or other forms.

[0058] Modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, that is, they may be located in one place or distributed across multiple network elements. Some or all of these modules may be selected to achieve the purpose of this embodiment based on actual needs.

[0059] In addition, the functional modules in various embodiments of the present invention may be integrated into a single processing unit, each module may exist physically separately, or two or more modules may be integrated into a single unit. The aforementioned modular units may be implemented in the form of hardware or hardware plus software functional units.

[0060] The integrated modules implemented in the form of software function modules can be stored in a computer-readable storage medium. The software function modules stored in a storage medium include a number of instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) or a processor to execute some of the steps of the methods of various embodiments of the present application.

[0061] It should be understood that the processor may be a central processing unit (CPU), other general-purpose processors, digital signal processors (DSP), or application-specific integrated circuits (ASICs). A general-purpose processor may be a microprocessor or any conventional processor. The steps of the method disclosed in the present invention may be directly implemented by a hardware processor or implemented by a combination of hardware and software modules in the processor.

[0062] The memory may include a high-speed RAM memory, and may also include non-volatile storage NVM, such as at least one disk memory, and may also be a USB flash drive, a mobile hard disk, a read-only memory, a magnetic disk or an optical disk.

[0063] The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus, or an Extended Industry Standard Architecture (EISA) bus. Buses can be divided into address buses, data buses, and control buses.

[0064] The storage medium may be implemented by any type of volatile or non-volatile memory device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk. The storage medium may be any available medium that can be accessed by a general-purpose or special-purpose computer.

[0065] An exemplary storage medium is coupled to a processor so that the processor can read information from the storage medium and write information to the storage medium. Of course, the storage medium can also be an integral part of the processor. The processor and the storage medium can be located in an application specific integrated circuit (ASIC). Of course, the processor and the storage medium can also exist as discrete components in an electronic device or a main control device.

[0066] Those skilled in the art will appreciate that all or part of the steps in the above-described method embodiments can be implemented using hardware associated with program instructions. The aforementioned program can be stored in a computer-readable storage medium. When executed, the program performs the steps of the above-described method embodiments. The aforementioned storage medium includes various media capable of storing program code, such as ROM, RAM, magnetic disks, or optical disks.

[0067] The above description is merely a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A method for starting a spark-ignition engine with a degraded state, characterized in that: include: Obtain engine speed, starting temperature and throttle opening; Check whether the manifold pressure sensor after the throttle valve is working properly; If the post-throttle manifold pressure sensor does not work properly, a preset manifold pressure map is searched based on the engine speed and the starting temperature to determine a manifold pressure base value, and a preset CURVE curve is searched based on the throttle opening to determine a manifold pressure correction value; The engine start is controlled by using the sum of the manifold pressure base value and the manifold pressure correction value as an intake manifold pressure substitute value.

2. The spark ignition engine degraded starting method according to claim 1, characterized in that: The starting temperature adopts the minimum value among the ambient temperature, engine water temperature and intake air temperature.

3. The spark ignition engine degraded starting method according to claim 1, characterized in that: If the post-throttle manifold pressure sensor operates normally, the value obtained by the post-throttle manifold pressure sensor is used to control the engine start.

4. The method for starting a spark ignition engine with degraded starting according to claim 1, characterized in that: If the throttle post-manifold pressure sensor is operating normally, the start success status is set and there are no start-related faults, the engine speed, starting temperature and the values ​​obtained by the throttle post-manifold pressure sensor are written to the corresponding positions in the preset manifold pressure map table, and the preset manifold pressure map table is updated.

5. The spark ignition engine degraded starting method according to claim 4, characterized in that: The manifold pressure map table is stored in the EEPROM of the ECU of the spark ignition engine.

6. The spark ignition engine degraded starting method according to claim 1, characterized in that: If the post-throttle manifold pressure sensor operates normally, but the start success status is not set and / or there is a start-related fault, the recorded value obtained by the post-throttle manifold pressure sensor is discarded and the preset manifold pressure map is not updated.

7. A spark-ignition engine degraded starting device, characterized in that: include: A manifold pressure determination module, configured to collect actual manifold pressure; A manifold pressure sensor working state determination module is used to determine whether the manifold pressure sensor is working normally; An engine speed determination module, used for collecting engine speed; A startup temperature determination module, used for collecting startup temperature; A throttle opening determination module is used to collect the throttle opening; A first storage module is used to store a preset manifold pressure spectrum table; The second storage module is used to store the preset CURVE curve; The control module searches a preset manifold pressure pulse spectrum table according to the engine speed and the starting temperature to determine a manifold pressure base value when the post-throttle manifold pressure sensor does not operate normally, searches a preset CURVE curve according to the throttle opening to determine a manifold pressure correction value, calculates an intake manifold pressure substitute value according to the manifold pressure base value and the manifold pressure correction value, and uses the intake manifold pressure substitute value to control engine starting.

8. A vehicle, characterized in that: include: at least one processor and memory; The memory stores computer-executable instructions; The at least one processor executes the computer-executable instructions stored in the memory, so that the at least one processor performs the spark-ignition engine degraded starting method according to any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer-executable instructions. When the processor executes the computer-executable instructions, the degraded starting method of the spark ignition engine according to any one of claims 1 to 6 is implemented.

Images