Hybrid vehicle engine shutdown fuel endurance mileage correction method and system
By calibrating the fuel range of hybrid electric vehicles with engine shutdown using HCU software strategies, the problem of inaccurate remaining range was solved, fuel efficiency was achieved, and engine uptime was extended.
Patent Information
- Application Number
- CN202511910301.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-17
- Publication Date
- 2026-02-27
AI Technical Summary
In existing hybrid vehicles, the remaining fuel range when the engine stops is inaccurate, resulting in a smaller perceived range for users, and the fuel in the tank cannot be fully utilized.
Through HCU software strategy, the remaining fuel range and fuel injection pulse width signals are received, the accumulated fuel quantity is calculated, the remaining range when the engine is stopped is calibrated, the engine start time is reasonably controlled, and the user's perceived range is extended.
It improves the accuracy of fuel range accuracy, extends the user's perception range, makes full use of fuel in the tank, and extends the engine's operating time.
Smart Images
Figure CN121572958A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of hybrid vehicle control technology, and in particular to a method and system for correcting the fuel range of a hybrid vehicle when the engine is off. Background Technology
[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.
[0003] In hybrid electric vehicles, engine start-up and shutdown are controlled by the Hybrid Control Unit (HCU). The HCU prevents engine start-up based on a 0% remaining fuel level signal.
[0004] In existing technology, when the remaining fuel level displayed on the instrument panel is close to 0, the instrument panel indicates low fuel range. However, the actual remaining fuel can still support the engine to run stably for at least tens of kilometers. The instrument panel can be set to indicate the corresponding mileage when the fuel range is low, for example, setting the remaining range to 60km. At this time, the HCU controls the engine to shut down based on the 0% remaining fuel level signal. The time from the instrument panel indicating low fuel range to the engine shutting down is relatively short, resulting in a small perceived range for the user and also causing more fuel in the tank to be unusable. Summary of the Invention
[0005] To address the aforementioned issues, this invention proposes a method and system for correcting the remaining driving range when the engine is off in a hybrid vehicle. This method calibrates the remaining driving range when the engine is off, and when a low driving range is indicated, it extends the user's perception range by prohibiting engine start-up based on actual operating conditions and fuel consumption control, thereby maximizing the use of fuel in the tank.
[0006] To achieve the above objectives, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for correcting the fuel range of a hybrid vehicle when the engine is off, comprising: Receive the current remaining fuel range and fuel injection pulse width signals, and initialize the zero fuel level calibration flag. When the remaining driving range is less than or equal to the set mileage threshold, the zero fuel level calibration flag is triggered at position one, and the cumulative fuel level after the zero fuel level calibration flag is triggered is obtained according to the fuel injection pulse width signal. Calculate the difference between the initial fuel quantity and the accumulated fuel quantity, and determine whether to prohibit engine starting based on the difference and the status of the empty fuel tank flag.
[0007] As an alternative implementation, if the current remaining fuel range is greater than the set mileage threshold, the zero fuel level calibration flag is set to zero, the fuel injection pulse width signal integration is stopped and cleared, and the engine is allowed to start.
[0008] As an alternative implementation, the initial fuel level for calibration is the difference between the remaining fuel level when the instrument triggers the low fuel range warning and the minimum available fuel level in the tank.
[0009] As an alternative implementation method, the process of determining whether to prohibit engine starting includes: The difference is greater than the set difference threshold; If the difference is greater than the set difference threshold, the engine is allowed to start; If the difference is less than or equal to the set difference threshold, then it is determined whether the empty fuel tank flag is set to 1, thereby determining whether to prohibit engine starting.
[0010] As an alternative implementation, if the empty fuel tank mark is in position 1, the engine is prohibited from starting; if the engine is running, a stop signal is sent to control the engine to stop. If the empty fuel tank mark is at position 0, the engine is allowed to start.
[0011] As an alternative implementation, if the remaining fuel percentage is 0 and the signal valid flag is valid, the empty fuel tank flag is set to 1.
[0012] Secondly, the present invention provides a hybrid vehicle engine shutdown fuel range correction system, comprising: The acquisition module is configured to receive the current remaining fuel range and fuel injection pulse width signal, and initialize the zero fuel level calibration flag. The first judgment module is configured to trigger the zero fuel level calibration flag position one when the current remaining fuel range is less than or equal to a set mileage threshold, and obtain the cumulative fuel level after the zero fuel level calibration flag position one based on the fuel injection pulse width signal. The second judgment module is configured to calculate the difference between the initial fuel quantity and the accumulated fuel quantity during calibration, and determine whether to prohibit engine starting based on the difference and the status of the empty fuel tank flag.
[0013] Thirdly, the present invention provides an electronic device including a memory and a processor, and computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, perform the method described in the first aspect.
[0014] Fourthly, the present invention provides a computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the method described in the first aspect.
[0015] Fifthly, the present invention provides a computer program product, including a computer program that, when executed by a processor, implements the method described in the first aspect.
[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: To address the issue of inaccurate remaining range when the engine is off in hybrid vehicles, this invention proposes a method and system for correcting the fuel range when the engine is off. The method uses HCU software to calibrate the remaining range when the engine is off. After the instrument panel indicates low fuel range, the HCU rationally controls the timing of engine restart prohibition based on actual operating conditions and fuel consumption, thus extending the user's perception range and allowing for more efficient use of the fuel in the tank.
[0017] When the fuel range is low, the actual fuel consumption is calculated by accumulating the fuel injection pulse width and compared with the difference from the initial fuel quantity calibrated, so that the engine can run for a longer time, making full and effective use of the remaining fuel in the fuel tank, and improving the user's perception of the time when the fuel range is low enough to stop the engine.
[0018] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description
[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0020] Figure 1 This is a flowchart of the hybrid vehicle engine shutdown fuel range correction method provided in Embodiment 1 of the present invention; Figure 2 This is a schematic diagram of the hybrid vehicle engine shutdown fuel range correction method provided in Embodiment 1 of the present invention; Figure 3 This diagram shows a comparison of the effects of the hybrid vehicle engine shutdown fuel range correction method provided in Embodiment 1 of the present invention with the prior art. Detailed Implementation
[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0022] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.
[0023] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless the context clearly indicates otherwise, the singular form is intended to include the plural form as well. Furthermore, it should be understood that the terms “comprising” and “including”, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.
[0024] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.
[0025] Example 1 This embodiment provides a method for correcting the fuel range of a hybrid vehicle when the engine is off, such as... Figures 1-2 As shown, it includes: Receive the current remaining fuel range and fuel injection pulse width signals, and initialize the zero fuel level calibration flag. When the remaining driving range is less than or equal to the set mileage threshold, the zero fuel level calibration flag is triggered at position one, and the cumulative fuel level after the zero fuel level calibration flag is triggered is obtained according to the fuel injection pulse width signal. Calculate the difference between the initial fuel quantity and the accumulated fuel quantity, and determine whether to prohibit engine starting based on the difference and the status of the empty fuel tank flag.
[0026] The method of this embodiment will be described in detail below.
[0027] Step S1: The instrument calculates the current remaining driving range based on the remaining fuel level, injection pulse width signal, and dead fuel volume, and sends the current remaining driving range to the HCU via the CAN bus.
[0028] Step S2: The HCU internally sets a zero fuel level calibration flag. After receiving the current remaining fuel range, it compares the current remaining fuel range with the set mileage threshold to determine whether the current fuel range is low, and thus determines whether fuel injection pulse width accumulation integration is required.
[0029] The mileage threshold value can be set through calibration.
[0030] The engine control unit (EMS) periodically sends the fuel injection pulse width signal to the HCU and instrument cluster via the CAN bus.
[0031] Step S3: If the current remaining fuel range is greater than the range threshold, the zero fuel level calibration flag inside the HCU is cleared, the zero fuel level calibration injection pulse width integral is stopped and cleared, and the engine is allowed to start or continue running.
[0032] Step S4: If the current remaining fuel range is less than or equal to the mileage threshold, then the zero fuel level calibration flag is set to 1, and the zero fuel level calibration injection pulse width integral is started to calculate the cumulative fuel consumption after the zero fuel level calibration flag is set to 1.
[0033] The calculation method is as follows: The engine control unit (EMS) periodically sends an instantaneous fuel injection pulse width signal Fc to the HCU at 100ms intervals. This signal represents the discrete fuel consumption. The HCU calculates the cumulative fuel quantity Fs by summing the instantaneous fuel injection pulse width signals.
[0034] Step S5: Set the calibration starting fuel quantity inside the HCU, and compare the fuel quantity difference between the calibration starting fuel quantity and the zero fuel quantity calibration injection pulse width integral in real time to determine whether the effective fuel available for stable engine operation is about to be consumed, so as to determine whether the actual remaining fuel can support stable engine operation.
[0035] Among them, the initial fuel quantity for calibration is the difference between the remaining fuel quantity when the instrument triggers the low fuel range warning and the minimum available fuel quantity in the fuel tank, which is the maximum fuel quantity that can maintain stable engine operation.
[0036] Specifically, when the remaining driving range is less than or equal to the mileage threshold, a low driving range warning is triggered to make the user aware that there is not much fuel left.
[0037] Step S6: If the difference is greater than the difference threshold, the HCU allows the engine to start.
[0038] Step S7: If the difference is less than or equal to the difference threshold, determine whether the empty fuel tank flag bit inside the engine control unit (EMS) is set to 1, and send it to the HCU.
[0039] The EMS receives the remaining fuel percentage from the instrument. When the EMS receives a remaining fuel percentage of 0 and the signal valid flag is valid, it sets the empty fuel tank flag to 1 and sends it to the HCU.
[0040] Step S7: If the empty fuel tank flag received by the HCU from the EMS is set to 1, the HCU will prevent the engine from starting. If the engine is running, the HCU will send a stop signal to control the engine to stop. If the HCU receives an empty fuel tank flag from the EMS with the flag set to 0, then the HCU allows the engine to start.
[0041] To address the issue of inaccurate remaining range when the engine is off in hybrid vehicles, this embodiment uses HCU software to calibrate the remaining range after engine shutdown. This allows the HCU to rationally control when the engine is prohibited from starting based on actual operating conditions and fuel consumption after the instrument panel indicates low fuel range. This extends the user's perceived range and ensures more efficient use of fuel in the tank. Figure 3 As shown.
[0042] When the fuel range is low, the HCU software calculates the actual fuel consumption by accumulating the fuel injection pulse width and compares the difference with the initial fuel quantity at calibration. This allows the engine to run for a longer period of time, making full and effective use of the remaining fuel in the tank and improving the user's perception of the time when the fuel range is so low that the engine has to stop.
[0043] Example 2 This embodiment provides a hybrid vehicle engine shutdown fuel range correction system, including: The acquisition module is configured to receive the current remaining fuel range and fuel injection pulse width signal, and initialize the zero fuel level calibration flag. The first judgment module is configured to trigger the zero fuel level calibration flag position one when the current remaining fuel range is less than or equal to a set mileage threshold, and obtain the cumulative fuel level after the zero fuel level calibration flag position one based on the fuel injection pulse width signal. The second judgment module is configured to calculate the difference between the initial fuel quantity and the accumulated fuel quantity during calibration, and determine whether to prohibit engine starting based on the difference and the status of the empty fuel tank flag.
[0044] It should be noted that the above modules correspond to the steps described in Embodiment 1, and the examples and application scenarios implemented by the above modules and the corresponding steps are the same, but are not limited to the content disclosed in Embodiment 1. It should also be noted that the above modules, as part of the system, can be executed in a computer system such as a set of computer-executable instructions.
[0045] In further embodiments, the following is also provided: An electronic device includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, wherein the computer instructions, when executed by the processor, perform the method described in Embodiment 1. For brevity, further details are omitted here.
[0046] It should be understood that in this embodiment, the processor can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor or any conventional processor, etc.
[0047] Memory may include read-only memory and random access memory, and provides instructions and data to the processor. A portion of memory may also include non-volatile random access memory. For example, memory may also store information about the device type.
[0048] A computer-readable storage medium for storing computer instructions, which, when executed by a processor, perform the method described in Embodiment 1.
[0049] The method in Example 1 can be directly implemented by a hardware processor, or implemented by a combination of hardware and software modules within the processor. The software modules can reside in readily available storage media in the field, such as random access memory, flash memory, read-only memory, programmable read-only memory, electrically erasable programmable memory, or registers. This storage medium is located in memory, and the processor reads information from the memory and, in conjunction with its hardware, completes the steps of the above method. To avoid repetition, a detailed description is not provided here.
[0050] A computer program product includes a computer program that, when executed by a processor, implements the method described in Embodiment 1.
[0051] The present invention also provides at least one computer program product tangibly stored on a non-transitory computer-readable storage medium. The computer program product includes computer-executable instructions, such as instructions included in program modules, which execute in a device on a target real or virtual processor to perform the processes / methods described above. Typically, program modules include routines, programs, libraries, objects, classes, components, data structures, etc., that perform specific tasks or implement specific abstract data types. In various embodiments, the functionality of program modules can be combined or divided among program modules as needed. The machine-executable instructions for the program modules can execute within a local or distributed device. In a distributed device, the program modules can reside in both local and remote storage media.
[0052] The computer program code used to implement the methods of the present invention may be written in one or more programming languages. This computer program code may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the computer or other programmable data processing device, the program code causes the functions / operations specified in the flowcharts and / or block diagrams to be implemented. The program code may be executed entirely on a computer, partially on a computer, as a stand-alone software package, partially on a computer and partially on a remote computer, or entirely on a remote computer or server.
[0053] In the context of this invention, computer program code or related data may be carried by any suitable carrier to enable a device, apparatus, or processor to perform the various processes and operations described above. Examples of carriers include signals, computer-readable media, and the like. Examples of signals may include electrical, optical, radio, sound, or other forms of propagation signals, such as carrier waves, infrared signals, etc.
[0054] Those skilled in the art will recognize that the units and algorithm steps described in connection with the various examples of this embodiment can be implemented in electronic hardware or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this invention.
[0055] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.
Claims
1. A method for correcting the fuel range of a hybrid vehicle when the engine is off, characterized in that, include: Receive the current remaining fuel range and fuel injection pulse width signals, and initialize the zero fuel level calibration flag. When the remaining driving range is less than or equal to the set mileage threshold, the zero fuel level calibration flag is triggered at position one, and the cumulative fuel level after the zero fuel level calibration flag is triggered is obtained according to the fuel injection pulse width signal. Calculate the difference between the initial fuel quantity and the accumulated fuel quantity, and determine whether to prohibit engine starting based on the difference and the status of the empty fuel tank flag.
2. The method for correcting the fuel range of a hybrid vehicle when the engine is off, as described in claim 1, is characterized in that... If the remaining fuel range is greater than the set range threshold, the zero fuel level calibration flag will be set to zero, the fuel injection pulse width signal integration will be stopped and cleared, and the engine will be allowed to start.
3. The method for correcting the fuel range of a hybrid vehicle when the engine is off, as described in claim 1, is characterized in that... The initial fuel level for calibration is the difference between the remaining fuel level when the instrument panel triggers the low fuel range warning and the minimum available fuel level in the tank.
4. The method for correcting the fuel range of a hybrid vehicle when the engine is off, as described in claim 1, is characterized in that... The process of determining whether to prohibit engine starting includes: The difference is greater than the set difference threshold; If the difference is greater than the set difference threshold, the engine is allowed to start; If the difference is less than or equal to the set difference threshold, then it is determined whether the empty fuel tank flag is set to 1, thereby determining whether to prohibit engine starting.
5. The method for correcting the fuel range of a hybrid vehicle when the engine is off, as described in claim 4, is characterized in that... If the empty fuel tank indicator is in position 1, the engine is prohibited from starting. If the engine is running, a stop signal is sent to control the engine to stop. If the empty fuel tank mark is at position 0, the engine is allowed to start.
6. The method for correcting the fuel range of a hybrid vehicle when the engine is off, as described in claim 4, is characterized in that... If the remaining fuel percentage is 0 and the signal valid flag is valid, set the empty fuel tank flag to 1.
7. A hybrid vehicle engine shutdown fuel range correction system, characterized in that, include: The acquisition module is configured to receive the current remaining fuel range and fuel injection pulse width signal, and initialize the zero fuel level calibration flag. The first judgment module is configured to trigger the zero fuel level calibration flag position one when the current remaining fuel range is less than or equal to a set mileage threshold, and obtain the cumulative fuel level after the zero fuel level calibration flag position one based on the fuel injection pulse width signal. The second judgment module is configured to calculate the difference between the initial fuel quantity and the accumulated fuel quantity during calibration, and determine whether to prohibit engine starting based on the difference and the status of the empty fuel tank flag.
8. An electronic device, characterized in that, It includes a memory and a processor, as well as computer instructions stored in the memory and running on the processor, which, when executed by the processor, perform the method according to any one of claims 1-6.
9. A computer-readable storage medium, characterized in that, Used to store computer instructions, which, when executed by a processor, perform the method described in any one of claims 1-6.
10. A computer program product, characterized in that, Includes a computer program, which, when executed by a processor, implements the method described in any one of claims 1-6.