Fuel cut-off control method of vehicle and vehicle

Abstract

The embodiment of the invention provides a fuel cut-off control method of a vehicle and the vehicle, and relates to the technical field of vehicle control. Under the condition that the vehicle meets the fuel cut-off condition, the vehicle is controlled to decelerate, in the deceleration process, if the vehicle meets the fuel reduction triggering condition, a fuel pump of the vehicle is controlled to gradually reduce fuel supply to an engine combustion chamber, and execution is stopped until the oil pressure of a fuel rail of the vehicle reaches a preset oil pressure threshold value; fuel supply to an engine combustion chamber is dynamically adjusted, so that the oil pressure of a fuel rail is maintained at a preset oil pressure threshold value. And in the process of dynamically adjusting the fuel supply to the engine combustion chamber, if it is determined that the vehicle meets the fuel cut-off execution condition, a fuel pressure relief valve of the vehicle is controlled to be opened so as to completely cut off the fuel supply to the engine combustion chamber. According to the fuel cut-off control method of the vehicle and the vehicle provided by the embodiment of the invention, sudden drop or sudden disappearance of the power of the vehicle in the process of braking by using the engine can be avoided.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a vehicle fuel cut-off control method and a vehicle. Background Art

[0002] A major drawback of current technology is the lack of a linkage mechanism between a vehicle's braking system and its powertrain. This prevents the vehicle from decelerating by cutting off power in an emergency or if the braking system fails, posing a significant threat to driving safety. With the increasing number of vehicles on the road, tens of thousands of brake-related accidents occur annually, with those caused by continued power output during braking being the most serious.

[0003] Related technologies achieve engine braking by controlling vehicle deceleration and directly requesting a fuel cut in emergency situations or when the brake system fails, thereby cutting off engine torque output. However, if a braking vehicle experiences a sudden drop in power or even a complete loss of power, it can make it difficult for the driver to control the vehicle's speed and direction, leading to more serious consequences. Therefore, preventing a sudden drop or loss of power during engine braking has become a pressing technical issue for those skilled in the art. Summary of the Invention

[0004] In view of the above problems, the present application provides a vehicle fuel cut-off control method and vehicle that overcomes the above problems or at least partially solves the above problems. The technical solution is as follows: In a first aspect, an embodiment of the present application provides a method for controlling fuel cut-off of a vehicle, comprising: Acquiring driving state information of a vehicle, and determining whether the vehicle meets a fuel cut-off condition based on the driving state information; When the vehicle meets the fuel cut-off condition, controlling the vehicle to decelerate; During the deceleration of the vehicle, determining whether the vehicle meets a fuel reduction trigger condition; if so, controlling the vehicle's fuel pump to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold; and dynamically adjusting the fuel supply to the engine combustion chamber to maintain the oil pressure in the fuel rail at the preset oil pressure threshold; During the process of dynamically adjusting the fuel supply to the engine combustion chamber, it is determined whether the vehicle meets the fuel cut-off execution condition; if so, the fuel pressure relief valve of the vehicle is controlled to open to completely cut off the fuel supply to the engine combustion chamber.

[0005] In a second aspect, an embodiment of the present application provides a fuel cut-off control device for a vehicle, comprising: an acquisition and judgment module, configured to acquire driving state information of a vehicle and, based on the driving state information, determine whether the vehicle satisfies a fuel cut-off condition; a first control module, configured to control the vehicle to decelerate when the vehicle meets a fuel cut-off condition; a first determination and control module, configured to determine whether the vehicle satisfies a fuel reduction trigger condition during deceleration of the vehicle; if so, control the vehicle's fuel pump to gradually reduce fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold; and dynamically adjust the fuel supply to the engine combustion chamber to maintain the oil pressure in the fuel rail at the preset oil pressure threshold; The second judgment and control module is used to judge whether the vehicle meets the fuel cut-off execution conditions during the process of dynamically adjusting the fuel supply to the engine combustion chamber; if so, control the fuel pressure relief valve of the vehicle to open to completely cut off the fuel supply to the engine combustion chamber.

[0006] In a third aspect, an embodiment of the present application provides a vehicle, comprising an interconnected acquisition module, a control module, and an actuator; the actuator comprising an interconnected fuel pump and a fuel pressure relief valve; the control module being connected to the fuel pump and the fuel pressure relief valve, respectively; The acquisition module is used to collect the driving status information of the vehicle; The control module is configured to obtain the driving state information and, based on the driving state information, determine whether the vehicle satisfies a fuel cut-off condition; control the vehicle to decelerate if the vehicle satisfies the fuel cut-off condition; determine whether the vehicle satisfies a fuel reduction trigger condition during the vehicle deceleration process; if so, control the vehicle's fuel pump to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold and then stops executing; dynamically adjust the fuel supply to the engine combustion chamber so that the oil pressure in the fuel rail is maintained at the preset oil pressure threshold; during the process of dynamically adjusting the fuel supply to the engine combustion chamber, determine whether the vehicle satisfies a fuel cut-off execution condition; if so, control the vehicle's fuel pressure relief valve to open so as to completely cut off the fuel supply to the engine combustion chamber.

[0007] In a fourth aspect, an embodiment of the present application provides an electronic device comprising a processor; and a memory arranged to store computer-executable instructions, wherein the computer-executable instructions are configured to be executed by the processor, and the computer-executable instructions are executed by the processor to implement the steps of the vehicle fuel cut-off control method as described in the first aspect.

[0008] In a fifth aspect, an embodiment of the present application provides a computer-readable storage medium, which is used to store computer-executable instructions. When the computer-executable instructions are executed by a processor, the steps of the vehicle fuel cut-off control method as described in the first aspect are implemented.

[0009] In a sixth aspect, an embodiment of the present application provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, it implements the steps of the vehicle fuel cut-off control method as described in the first aspect.

[0010] The technical solution provided in the embodiments of the present application obtains vehicle driving status information and can determine whether the vehicle meets the fuel cutoff conditions based on the driving status information. Once the vehicle meets the fuel cutoff conditions, the vehicle is controlled to decelerate, effectively achieving a rapid reduction in vehicle speed. This ensures that the vehicle speed is within a relatively safe range when the fuel cutoff is implemented, providing reliable protection for the safe implementation of the subsequent fuel cutoff process. During the vehicle deceleration process, if the vehicle meets the fuel reduction trigger condition, the vehicle's fuel pump is controlled to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold and stops executing. The fuel supply to the engine combustion chamber is dynamically adjusted to maintain the oil pressure in the fuel rail at the preset oil pressure threshold. During the process of dynamically adjusting the fuel supply to the engine combustion chamber, if the vehicle meets the fuel cutoff execution condition, the vehicle's fuel pressure relief valve is controlled to open to completely cut off the fuel supply to the engine combustion chamber. As can be seen, this technical solution divides the fuel cutoff process into two phases: fuel reduction and fuel cutoff. By gradually reducing the fuel supply to the engine combustion chamber, it not only reduces engine output torque to quickly reduce vehicle power, achieving the effect of engine braking and further decelerating the vehicle, but also prevents the danger of sudden power drops. Furthermore, when the fuel rail oil pressure reaches the preset oil pressure threshold and the fuel cutoff execution condition has not yet been triggered, the oil pressure is dynamically maintained to prevent sudden engine stalls, thereby avoiding the safety risks caused by a sudden loss of vehicle power. When the fuel cutoff execution condition is triggered, the vehicle's fuel pressure relief valve is opened, returning the main oil line fuel to the fuel tank, completely cutting off the engine fuel supply and forcing the vehicle into a coasting deceleration state, ensuring the greatest possible safety for both passengers and vehicles in emergency situations.

[0011] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] 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: Figure 1 is a schematic block diagram of a vehicle provided in one embodiment of the present application; Figure 2 is a schematic block diagram of a vehicle provided in another embodiment of the present application; Figure 3 is a schematic block diagram of a vehicle provided in another embodiment of the present application; Figure 4 is a schematic block diagram of a vehicle provided in another embodiment of the present application; Figure 5 is a schematic block diagram of a vehicle provided in another embodiment of the present application; Figure 6 This is a schematic flow chart of a vehicle fuel cut-off control method provided in one embodiment of the present application; Figure 7 is a schematic flow chart of a vehicle fuel cut-off control method provided in another embodiment of the present application; Figure 8 This is a structural diagram of a fuel cut-off control device for a vehicle provided in one embodiment of the present application; Figure 9 This is a schematic diagram of the hardware structure of an electronic device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0013] The following describes exemplary embodiments of the present application in more detail with reference to the accompanying drawings. Although exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0014] In related technologies, in order to solve the problem that the EPB (Electrical Park Brake) system has a long braking distance in an emergency and is easy to exit the brake, leading to traffic accidents, property damage and casualties, the accompanying driving mode will be activated to control the ESP (Electronic Stability Program) to slow down the vehicle at a preset deceleration rate, and send a fuel cut-off request signal to the EMS (Engine Management System) to cut off the engine torque output.

[0015] However, if a braking vehicle experiences a sudden drop in power or even a complete loss of power, it can make it difficult for the driver to control the vehicle's speed and direction, leading to more serious consequences. Therefore, while the braking solution in related art involves deceleration followed by fuel cut-off, the lack of clear fuel cut-off restrictions and timing still creates the risk of a sudden drop or loss of power during engine braking, reducing the safety of the braking process.

[0016] To this end, embodiments of the present application provide a vehicle fuel cutoff control method. By acquiring vehicle driving status information and, based on this driving status information, determining whether the vehicle meets fuel cutoff conditions, the method controls the vehicle to decelerate, effectively reducing its speed. This ensures that the vehicle speed remains within a relatively safe range when the fuel cutoff is implemented, providing reliable assurance for the safe implementation of the subsequent fuel cutoff process. The fuel cutoff process can also be divided into two phases: fuel reduction and fuel cutoff. By gradually reducing the fuel supply to the engine combustion chamber, the method not only reduces engine output torque to rapidly reduce vehicle power, achieving the effect of engine braking and further decelerating the vehicle, but also avoids the dangers of sudden sudden drops in vehicle power. Furthermore, when the fuel rail oil pressure reaches a preset oil pressure threshold and the fuel cutoff execution condition is not currently triggered, the method dynamically maintains a stable oil pressure, preventing sudden engine stalls and thus avoiding the safety risks associated with a sudden loss of vehicle power. After the fuel cut-off execution conditions are triggered, the vehicle's fuel pressure relief valve can be opened, the fuel in the main oil circuit can be returned to the fuel tank, the engine fuel supply can be completely cut off, and the vehicle can be forced to enter a gliding deceleration state, thus ensuring the safety of people and vehicles in emergency situations to the greatest extent.

[0017] Figure 1 This is a schematic block diagram of a vehicle provided by an embodiment of the present application, such as Figure 1 As shown, the vehicle includes a data acquisition module 10, a control module 20, and an actuator 30 connected to each other. The actuator 30 may include a fuel pump 310 and a fuel pressure relief valve 320 connected to each other. The control module 20 is connected to the fuel pump 310 and the fuel pressure relief valve 320 respectively.

[0018] In this embodiment, the acquisition module 10 is used to collect the vehicle's driving status information. The control module 20 is used to obtain the collected driving status information and, based on the driving status information, determine whether the vehicle meets the fuel cut-off conditions. If the vehicle meets the fuel cut-off conditions, the vehicle is controlled to decelerate. During the vehicle's deceleration, it is determined whether the vehicle meets the fuel reduction trigger conditions. If so, the vehicle's fuel pump 310 is controlled to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold and stops executing. The fuel supply to the engine combustion chamber is dynamically adjusted to maintain the oil pressure in the fuel rail at the preset oil pressure threshold. During the process of dynamically adjusting the fuel supply to the engine combustion chamber, it is determined whether the vehicle meets the fuel cut-off execution conditions. If so, the vehicle's fuel pressure relief valve 320 is controlled to open to completely cut off the fuel supply to the engine combustion chamber.

[0019] Alternatively, the fuel pump can be an electronic fuel pump. Compared to conventional fuel pumps, electronic fuel pumps support PWM (Pulse Width Modulation) frequency reduction control and have a shorter response time, enabling quicker response in emergency situations. For example, they can implement a 0.5-second gradual fuel cut-off, gradually reducing fuel supply without causing a sudden and dangerous drop in vehicle power.

[0020] The fuel pressure relief valve can be a high-pressure fuel rail solenoid pressure relief valve or a high-pressure direct injection solenoid pressure relief valve. Compared to conventional pressure relief valves, the high-pressure direct injection solenoid pressure relief valve has a response time of only 20ms and a resistance of up to 35MPa (megapascals), enabling rapid and reliable fuel shutoff. The high-pressure fuel rail solenoid pressure relief valve can achieve an emergency shutoff in less than 50ms, ensuring rapid cessation of fuel supply in the most critical moments.

[0021] Current fuel shutoff solutions, such as electronic throttle control, have significant response delays, typically ranging from 200-500ms, making them difficult to rapidly shut off power in emergency situations. Traditional mechanical fuel shutoff devices also fail to meet the rapid response requirements in emergency situations, with response times far exceeding the required standard of less than 100ms. Therefore, in practice, if an electronic fuel pump is used in a vehicle in conjunction with a high-pressure fuel rail solenoid pressure relief valve or a high-pressure direct injection solenoid pressure relief valve, this approach can reduce vehicle system response time and improve fuel shutoff efficiency compared to existing fuel shutoff solutions. For example, the system can respond quickly to emergencies in less than 80ms, shutting off 70% of the fuel supply in the first second and 95% within 3 seconds, effectively achieving fuel shutoff and rapidly reducing vehicle power.

[0022] In a vehicle using an embodiment of the present application, a collection module collects driving status information. The control module, by acquiring the collected driving status information, can determine whether the vehicle meets the fuel cutoff conditions based on the driving status information. Once the vehicle meets the fuel cutoff conditions, the vehicle is controlled to decelerate, effectively achieving a rapid reduction in speed. This ensures that the vehicle speed remains within a relatively safe range when the fuel cutoff is implemented, providing reliable assurance for the safe implementation of the subsequent fuel cutoff process. During the deceleration process, if the vehicle meets the fuel reduction triggering conditions, the vehicle's fuel pump is controlled to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold. The fuel pump then dynamically adjusts the fuel supply to the engine combustion chamber to maintain the oil pressure in the fuel rail at the preset oil pressure threshold. During the dynamic adjustment of the fuel supply to the engine combustion chamber, if the vehicle meets the fuel cutoff execution conditions, the vehicle's fuel pressure relief valve is controlled to open, completely cutting off the fuel supply to the engine combustion chamber. As can be seen, this technical solution divides the fuel cutoff process into two phases: fuel reduction and fuel cutoff. By gradually reducing the fuel supply to the engine combustion chamber, it not only reduces engine output torque to quickly reduce vehicle power, achieving the effect of engine braking and further decelerating the vehicle, but also prevents the danger of sudden power drops. Furthermore, when the fuel rail oil pressure reaches the preset oil pressure threshold and the fuel cutoff execution condition has not yet been triggered, the oil pressure is dynamically maintained to prevent sudden engine stalls, thereby avoiding the safety risks caused by a sudden loss of vehicle power. When the fuel cutoff execution condition is triggered, the vehicle's fuel pressure relief valve is opened, returning the main oil line fuel to the fuel tank, completely cutting off the engine fuel supply and forcing the vehicle into a coasting deceleration state, ensuring the greatest possible safety for both passengers and vehicles in emergency situations.

[0023] In a specific embodiment, Figure 2 As shown, the vehicle actuator 30 may include a fuel tank 330 , a fuel filter 340 , a high-pressure fuel pump 350 , a fuel rail 360 , a fuel injector 370 and an engine combustion chamber 380 in addition to a fuel pump 310 and a fuel pressure relief valve 320 .

[0024] Among them, the fuel pump 310 is connected between the fuel tank 330 and the fuel filter 340. The fuel filter 340, the high-pressure fuel pump 350, the fuel rail 360, the fuel injector 370, and the engine combustion chamber 380 are connected in sequence, thereby realizing the fuel in the fuel tank being transported to the engine combustion chamber to provide power for the vehicle.

[0025] The connection relationship of the fuel pressure relief valve 320 is not shown in FIG. Figure 2In application, if fuel pressure relief valve 320 is a high-pressure fuel rail solenoid pressure relief valve, the high-pressure fuel rail solenoid pressure relief valve is connected to fuel rail 360 and fuel tank 330, respectively. If fuel pressure relief valve 320 is a high-pressure direct injection solenoid pressure relief valve, the high-pressure direct injection solenoid pressure relief valve is connected to fuel injector 370 and fuel tank 330, respectively.

[0026] In a specific embodiment, if the fuel pump 310 is an electronic fuel pump 310 and the fuel pressure relief valve 320 is a high-pressure fuel rail electromagnetic pressure relief valve 320, then Figures 1 to 2 Based on the vehicle shown, Figure 3 As shown, the high-pressure fuel rail electromagnetic pressure relief valve 320 may include an electromagnetic driving device 3210 and a pressure relief valve body 3220 connected to each other. The electromagnetic driving device 3210 is connected to the control module 20. The pressure relief valve body 3220 is connected to the fuel rail 360 and the fuel tank 330 respectively.

[0027] The pressure relief valve body may include a housing, a valve core, a spring, and a sealing ring. While the vehicle is in motion, fuel in the fuel tank is pumped out by the electronic fuel pump, passing through the fuel filter, high-pressure fuel pump, fuel rail, and fuel injectors, before being delivered to the engine's combustion chamber. Opening the high-pressure fuel rail's solenoid pressure relief valve blocks the fuel flow between the electronic fuel pump and the engine's combustion chamber, allowing the pumped fuel to flow back into the tank.

[0028] In a specific embodiment, Figure 1 Based on the vehicle shown, Figure 4 As shown, the acquisition module 10 may include a brake position sensor 110, an accelerator position sensor 120, a steering wheel angle sensor 130, a vehicle speed sensor 140, an engine speed sensor 150, a fuel pressure sensor 160, a transmission gear position sensor 170, a deceleration sensor 180, and a preset emergency button 190. The brake position sensor 110, the accelerator position sensor 120, the steering wheel angle sensor 130, the vehicle speed sensor 140, the engine speed sensor 150, the fuel pressure sensor 160, the transmission gear position sensor 170, the deceleration sensor 180, and the preset emergency button 190 are respectively connected to the control module 20.

[0029] Among them, the brake position sensor 110 is used to measure brake pedal travel. The throttle position sensor 120 is used to measure throttle pedal travel. The steering wheel angle sensor 130 is used to measure steering wheel angle. The vehicle speed sensor 140 is used to measure vehicle speed. The engine speed sensor 150 is used to measure engine speed. The fuel pressure sensor 160 is used to measure vehicle oil pressure. The transmission gear position sensor 170 is used to measure transmission gear position.

[0030] Deceleration sensor 180 is used to detect vehicle deceleration during braking. Control module 20 uses this detected deceleration to calculate the current road adhesion coefficient. In practice, the road adhesion coefficient calculation method may be the same or different for different vehicle models, and this embodiment does not specifically limit this.

[0031] The preset emergency button 190 is configured to transmit a trigger signal to the control module 20 upon receiving a trigger operation by a person in the vehicle, so that the control module 20, in response to the trigger signal, marks the trigger state of the preset emergency button as triggered. In practice, the preset emergency button can be an existing virtual button or physical button on the vehicle, or a newly added virtual button or physical button on the vehicle, which is not specifically limited in this embodiment.

[0032] In a specific embodiment, the control module 20 can obtain the collected steering wheel angle, brake pedal travel, vehicle speed, accelerator pedal travel and the trigger status of the preset emergency button, thereby determining that the vehicle meets the fuel cut-off condition when the steering wheel angle of the vehicle is less than a first angle and the vehicle meets at least two trigger conditions.

[0033] Among them, the trigger conditions may include: the brake pedal stroke is greater than the first stroke threshold and the duration is greater than the first duration threshold; the vehicle speed is greater than the first speed threshold and the accelerator pedal stroke is greater than the second stroke threshold; the trigger state of the preset emergency button is triggered; and so on.

[0034] In a specific embodiment, the control module 20 can be used to monitor the real-time speed of the vehicle during the vehicle deceleration process; determine whether the real-time speed is less than the second speed threshold; if so, determine that the vehicle meets the fuel reduction trigger condition; or, Monitor a first deceleration duration of the vehicle; determine whether the first deceleration duration is greater than or equal to a second duration threshold; and if so, determine that the vehicle meets a fuel reduction trigger condition.

[0035] In one specific embodiment, the control module 20 can be configured to control the fuel pump 310 to reduce its speed based on a preset PWM control signal, thereby reducing fuel supply to the engine combustion chamber 380. During the process of reducing the speed of the fuel pump 310, the control module 20 monitors the real-time oil pressure of the fuel rail 360. If the real-time oil pressure reaches a preset oil pressure threshold, the control module 20 stops controlling the vehicle's fuel pump 310 to reduce its speed. Furthermore, the control module 20 monitors the vehicle's engine operating parameters. Based on the monitored real-time vehicle speed, real-time oil pressure, and engine operating parameters, the control module 20 dynamically adjusts the speed of the fuel pump 310 to maintain the oil pressure of the fuel rail 360 at the preset oil pressure threshold.

[0036] In a specific embodiment, the control module 20 can be used to determine whether the monitored real-time vehicle speed is less than a third speed threshold during the process of dynamically adjusting the fuel supply to the engine combustion chamber 380; if so, determine that the vehicle meets the fuel cut-off execution condition; or Monitor the vehicle's second deceleration duration; determine whether the second deceleration duration is greater than or equal to a third duration threshold; if so, determine that the vehicle meets the fuel cut-off execution condition; the second deceleration duration is: the duration corresponding to the process of gradually reducing the fuel supply to the engine combustion chamber 380 until the oil pressure in the fuel rail 360 reaches a preset oil pressure threshold.

[0037] In a specific embodiment, Figure 1 Based on the vehicle shown, Figure 5 As shown, the actuator 30 may include a vacuum energy storage device 390. The vacuum energy storage device 390 may include an electric vacuum pump 3910 and an energy storage module 3920 connected to each other. The electric vacuum pump 3910 is connected to the control module 20 and the vehicle's brake assist system 40 respectively.

[0038] The energy storage module can store energy, thereby providing energy to the electric vacuum pump when the vehicle's engine stops, so that the electric vacuum pump provides brake assistance to the vehicle's brake assist system.

[0039] The control module 20 can be used to control the vacuum energy storage device 390 to provide brake assist to the vehicle's brake assist system 40 when the fuel supply to the engine combustion chamber 380 is completely cut off.

[0040] In a specific embodiment, the control module 20 can be used to determine a deceleration control signal corresponding to the vehicle according to the driving state information when the vehicle meets the fuel cut-off condition, thereby controlling the vehicle to decelerate according to the deceleration control signal.

[0041] Among them, driving status information may include steering wheel angle, vehicle speed, engine speed, transmission gear, brake pedal travel and road adhesion coefficient.

[0042] In one specific embodiment, the deceleration control signal may include a torque reduction control signal and a downshift control signal. The control module 20 may be configured to control the vehicle's engine to reduce torque based on the torque reduction control signal; and control the vehicle's transmission to downshift based on the downshift control signal. When the engine torque is reduced and / or the transmission gear is downshifted, the vehicle's speed decreases.

[0043] In applications, the control module can use an MCU (Microcontroller Unit) with an ASIL (Automotive Safety Integrity Level) of D (ASIL levels are A / B / C / D from low to high), so that it can monitor key parameters of the vehicle in real time, such as brake pedal travel, accelerator pedal travel, steering wheel angle, vehicle speed, engine speed, oil pressure, transmission gear, road adhesion coefficient, and the trigger status of the preset emergency button, to ensure accurate perception and control of the vehicle's driving status.

[0044] Furthermore, the vehicle provided in the embodiments of the present application can utilize CAN (Controller Area Network) bus communication to ensure stable and reliable data transmission and prevent system failures caused by communication failures. A backup supercapacitor can also be provided to power the vehicle. This ensures that the vehicle can continue to operate for a period of time (e.g., 30 seconds) even after a power outage, buying valuable time for emergency response.

[0045] Based on the above-mentioned vehicle, in order to solve the technical problem that a sudden drop or disappearance of vehicle power during engine braking may easily bring safety risks, the present application provides a vehicle fuel cut-off control method.

[0046] Figure 6 This is a schematic flow chart of a method for controlling fuel cut-off of a vehicle provided by an embodiment of the present application. In this embodiment, the method for controlling fuel cut-off of a vehicle is applied to Figures 1 to 5 The vehicle shown. Figure 6 As shown, the method includes: S602: Acquire driving state information of the vehicle, and determine whether the vehicle meets the fuel cut-off condition based on the driving state information.

[0047] Among them, the vehicle's driving status information may include brake pedal travel, accelerator pedal travel, steering wheel angle, vehicle speed, engine speed, oil pressure, gearbox gear, road adhesion coefficient, trigger status of the preset emergency button, etc.

[0048] S604: When the vehicle meets the fuel cut-off condition, control the vehicle to decelerate.

[0049] If the vehicle meets the fuel cutoff conditions, it means that the vehicle is currently driving at a risk or has encountered an abnormal situation. At this time, controlling the vehicle to slow down is conducive to reducing the vehicle's speed in a timely manner, thereby reducing the vehicle's safety risks.

[0050] S606, during the vehicle deceleration process, determine whether the vehicle meets the fuel reduction trigger condition; if so, control the vehicle's fuel pump to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold. Dynamically adjust the fuel supply to the engine combustion chamber to maintain the oil pressure in the fuel rail at the preset oil pressure threshold.

[0051] It is understandable that if the vehicle does not meet the fuel reduction trigger condition, the vehicle will continue to monitor whether it meets the fuel reduction trigger condition during the vehicle deceleration process until the vehicle meets the fuel reduction trigger condition, reducing the fuel supply to the engine combustion chamber.

[0052] S608, during the process of dynamically adjusting the fuel supply to the engine combustion chamber, determine whether the vehicle meets the fuel cut-off execution conditions; if so, control the vehicle's fuel pressure relief valve to open to completely cut off the fuel supply to the engine combustion chamber.

[0053] It is understandable that if the vehicle does not meet the fuel cut-off execution conditions, the vehicle will continue to monitor whether it meets the fuel cut-off execution conditions while dynamically adjusting the fuel supply to the engine combustion chamber. Until the vehicle meets the fuel cut-off execution conditions, the vehicle's fuel pressure relief valve will be controlled to open.

[0054] The fuel reduction triggering conditions may include the vehicle's real-time speed being less than a second speed threshold and / or reaching the first braking duration corresponding to the deceleration phase. This first braking duration can be calculated based on factors such as vehicle speed, distance between the vehicle and the obstacle, and road adhesion coefficient, or it can be determined based on historical braking data for the vehicle model. The specific calculation method is not limited in this embodiment. The deceleration phase is the process of controlling the vehicle to decelerate when the fuel cutoff conditions are met.

[0055] The fuel cut-off execution conditions may include the vehicle's real-time speed being less than a third speed threshold, and / or the second braking duration corresponding to the fuel reduction phase being reached. Similar to the calculation method for the first braking duration, this embodiment does not limit the specific calculation method for the second braking duration. The fuel reduction phase, when the vehicle meets the fuel reduction trigger conditions, controls the vehicle's fuel pump to gradually reduce fuel supply to the engine's combustion chamber until the fuel rail oil pressure reaches a preset oil pressure threshold. The fuel pump then dynamically adjusts the fuel supply to the engine's combustion chamber to maintain the fuel rail oil pressure at the preset oil pressure threshold.

[0056] The technical solution provided in the embodiments of the present application obtains vehicle driving status information and can determine whether the vehicle meets the fuel cutoff conditions based on the driving status information. Once the vehicle meets the fuel cutoff conditions, the vehicle is controlled to decelerate, effectively achieving a rapid reduction in vehicle speed. This ensures that the vehicle speed is within a relatively safe range when the fuel cutoff is implemented, providing reliable protection for the safe implementation of the subsequent fuel cutoff process. During the vehicle deceleration process, if the vehicle meets the fuel reduction trigger condition, the vehicle's fuel pump is controlled to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold and stops executing. The fuel supply to the engine combustion chamber is dynamically adjusted to maintain the oil pressure in the fuel rail at the preset oil pressure threshold. During the process of dynamically adjusting the fuel supply to the engine combustion chamber, if the vehicle meets the fuel cutoff execution condition, the vehicle's fuel pressure relief valve is controlled to open to completely cut off the fuel supply to the engine combustion chamber. As can be seen, this technical solution divides the fuel cutoff process into two phases: fuel reduction and fuel cutoff. By gradually reducing the fuel supply to the engine combustion chamber, it not only reduces engine output torque to quickly reduce vehicle power, achieving the effect of engine braking and further decelerating the vehicle, but also prevents the danger of sudden power drops. Furthermore, when the fuel rail oil pressure reaches the preset oil pressure threshold and the fuel cutoff execution condition has not yet been triggered, the oil pressure is dynamically maintained to prevent sudden engine stalls, thereby avoiding the safety risks caused by a sudden loss of vehicle power. When the fuel cutoff execution condition is triggered, the vehicle's fuel pressure relief valve is opened, returning the main oil line fuel to the fuel tank, completely cutting off the engine fuel supply and forcing the vehicle into a coasting deceleration state, ensuring the greatest possible safety for both passengers and vehicles in emergency situations.

[0057] In one specific embodiment, the driving state information may include steering wheel angle, brake pedal travel, vehicle speed, accelerator pedal travel, and the triggering status of a preset emergency button. Determining whether the vehicle meets the fuel cutoff condition (i.e., S602) based on the driving state information may be performed as follows: if the vehicle's steering wheel angle is less than a first angle and the vehicle meets at least two triggering conditions, determining that the vehicle meets the fuel cutoff condition.

[0058] Among them, the trigger conditions may include: the brake pedal stroke is greater than the first stroke threshold and the duration is greater than the first duration threshold; the vehicle speed is greater than the first speed threshold and the accelerator pedal stroke is greater than the second stroke threshold; the trigger state of the preset emergency button is triggered.

[0059] In this embodiment, if the duration of the brake pedal travel exceeding the first travel threshold exceeds the first duration threshold, it indicates that the driver is performing an emergency braking operation. For example, if the brake pedal travel is greater than 90% and the duration is greater than 1.5 seconds, it can be determined that the driver is performing an emergency braking operation.

[0060] In this embodiment, if the vehicle speed is greater than a first speed threshold and the accelerator pedal travel is greater than a second travel threshold, it may indicate abnormal vehicle acceleration or driver error. For example, if the vehicle speed is greater than 30 km / h (kilometers per hour) and the accelerator pedal travel is greater than 70%, it can be determined that abnormal vehicle acceleration or driver error has occurred.

[0061] In this embodiment, the triggering state of the preset emergency button is triggered, which indicates that an emergency situation has occurred.

[0062] In the application, the first angle can be selected in combination with the specific vehicle model parameters, such as selecting 100°, 120°, etc. as the first angle.

[0063] In this embodiment, the vehicle is determined to have met the fuel cutoff condition when the vehicle's steering wheel angle is less than a first angle and the vehicle meets at least two triggering conditions. Through multi-signal cross-validation, this effectively prevents false triggering of fuel cutoffs, ensuring accurate fuel cutoff execution and minimizing impacts on normal vehicle operation. Furthermore, if the vehicle's steering wheel angle exceeds the first angle, fuel cutoff execution can be delayed. This prevents vehicle loss of control due to fuel cutoffs in unusual road conditions, such as curves, and ensures driving safety.

[0064] In one specific embodiment, driving status information may include steering wheel angle, vehicle speed, engine speed, transmission gear, brake pedal travel, and road adhesion coefficient. If the vehicle meets the fuel cutoff conditions, the vehicle is controlled to decelerate (i.e., S604), which may be performed as follows: Steps A1 and A2: Step A1: When the vehicle meets the fuel cut-off condition, a corresponding deceleration control signal for the vehicle is determined according to the driving state information.

[0065] Step A2: Control the vehicle to decelerate according to the deceleration control signal.

[0066] The deceleration control signal may include a torque reduction control signal and a downshift control signal. Step A2 may be performed as follows: controlling the vehicle's engine to reduce torque according to the torque reduction control signal; and controlling the vehicle's transmission to downshift according to the downshift control signal.

[0067] In this case, when the torque of the engine is reduced and / or the gear of the transmission is downgraded, the speed of the vehicle is reduced.

[0068] In this embodiment, the target torque of the engine can be calculated based on the steering wheel angle, vehicle speed, engine speed, brake pedal travel and road adhesion coefficient, and then a torque reduction control signal is sent to the engine ECU (Electronic Control Unit) based on the target torque to brake the vehicle through engine torque reduction and control vehicle deceleration.

[0069] The target gear of the transmission can be determined according to the vehicle speed, transmission gear and brake pedal travel, and a downshift control signal can be sent to the transmission ECU based on the target gear to brake the vehicle by downshifting the transmission and control the vehicle to decelerate.

[0070] In this embodiment, when the vehicle meets fuel-cut conditions, the corresponding torque reduction control signal and downshift control signal are determined based on driving status information. Based on these two control signals, the engine and transmission are used to brake the vehicle separately, reducing its speed. Due to the rapid response speed of direct signal control, the vehicle's deceleration efficiency is significantly improved. Furthermore, this redundant control approach (i.e., separate control of the engine and transmission to reduce vehicle speed) ensures timely deceleration, avoiding situations where poor deceleration performance can be achieved due to engine or transmission failure.

[0071] In a specific embodiment, the step of determining whether the vehicle meets the fuel reduction triggering conditions in S606 can be executed as the following step B1 or step B2. By monitoring the vehicle's driving status information, it is timely determined whether the vehicle meets the fuel reduction triggering conditions to ensure that the fuel reduction stage in the vehicle's fuel cut-off process is executed in a timely manner, thereby improving the vehicle's deceleration efficiency.

[0072] Step B1, monitoring the real-time speed of the vehicle; determining whether the real-time speed is less than a second speed threshold; if so, determining that the vehicle meets the fuel reduction triggering condition.

[0073] In this embodiment, by using the real-time vehicle speed being less than the second speed threshold as a fuel reduction trigger condition, it can ensure that the vehicle's initial speed during the fuel reduction phase meets the set safety standards, thereby avoiding fuel reduction control for vehicles at dangerous speeds and reducing safety risks during the fuel reduction phase.

[0074] Step B2, monitoring the first deceleration duration of the vehicle; determining whether the first deceleration duration is greater than or equal to a second duration threshold; if so, determining that the vehicle meets the fuel reduction trigger condition.

[0075] In this embodiment, the first deceleration duration is the first braking duration corresponding to the vehicle's deceleration stage. Since the braking distance of the vehicle is limited in an emergency, by using this braking duration as a fuel reduction trigger condition, the timely execution of the fuel reduction stage can be ensured, avoiding the vehicle's delay in starting fuel reduction control, thereby improving the vehicle's deceleration efficiency.

[0076] In a specific embodiment, the step of controlling the vehicle's fuel pump to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold in S606 is stopped; and the step of dynamically adjusting the fuel supply to the engine combustion chamber to maintain the oil pressure in the fuel rail at the preset oil pressure threshold can be performed as follows: Steps C1 to C4: In step C1 , based on a preset PWM control signal, the fuel pump is controlled to reduce its rotation speed so as to reduce the fuel supply to the combustion chamber of the engine.

[0077] For example, the preset PWM control signal's starting duty cycle can be set to 50%, the ending duty cycle can be set to 10%, and the decreasing slope is fixed at 40% / second (i.e., decreasing by 4% every 100 ms). The starting duty cycle corresponds to the fuel pump's baseline speed (i.e., the fuel pump speed during driving), and the ending duty cycle corresponds to the fuel pump's target speed (i.e., the final desired fuel pump speed).

[0078] Step C2: monitoring the real-time oil pressure of the fuel rail while the fuel pump speed is decreasing.

[0079] Step C3, when the real-time oil pressure reaches a preset oil pressure threshold, stopping the step of controlling the vehicle's fuel pump to reduce the speed; and monitoring the vehicle's engine operating parameters.

[0080] Among them, engine operating parameters may include power output stability, idle speed, whether there is abnormal sound, whether there is component damage or wear, temperature, lubrication, etc.

[0081] Step C4 , dynamically adjusting the speed of the fuel pump according to the monitored real-time vehicle speed, real-time oil pressure, and engine operating parameters, so as to maintain the oil pressure of the fuel rail at a preset oil pressure threshold.

[0082] For example, if it is detected that the vehicle's engine temperature is too low, the duty cycle needs to be increased (ie, the speed of the fuel pump needs to be increased) to maintain the oil pressure because the viscosity of the fuel is high at low temperatures.

[0083] In this embodiment, a preset PWM control signal is used to efficiently control the fuel pump to reduce speed, thereby reducing fuel supply to the engine's combustion chamber. By monitoring the vehicle's real-time oil pressure, speed, and engine operating parameters during the fuel pump speed reduction process, the system can promptly stop reducing the fuel pump speed according to the preset PWM control signal and dynamically adjust the fuel pump speed to maintain the fuel rail's oil pressure. This helps prevent sudden engine stalls and mitigates the risk of secondary accidents caused by a sudden loss of vehicle power.

[0084] In a specific embodiment, the step of determining whether the vehicle meets the fuel cut-off execution conditions in S608 can be executed as the following step D1 or step D2. By monitoring the vehicle's driving status information, it is promptly determined whether the vehicle meets the fuel cut-off execution conditions to ensure that the fuel cut-off stage in the vehicle's fuel cut-off process is executed in a timely manner, thereby improving the vehicle's deceleration efficiency.

[0085] Step D1, determining whether the monitored real-time vehicle speed is less than a third speed threshold; if the real-time vehicle speed is less than the third speed threshold, determining that the vehicle meets the fuel cut-off execution condition.

[0086] In this embodiment, by using the real-time vehicle speed being less than the third speed threshold as the fuel cut-off execution condition, it can ensure that the vehicle's initial speed during the fuel cut-off phase meets the set safety standards, thereby avoiding fuel cut-off control for vehicles at dangerous speeds and reducing the risk of secondary accidents during the fuel cut-off phase.

[0087] Step D2, monitoring the second deceleration duration of the vehicle; determining whether the second deceleration duration is greater than or equal to a third duration threshold; if so, determining that the vehicle meets the fuel cut-off execution condition.

[0088] The second deceleration time is the time duration corresponding to the process in which the fuel supply to the engine combustion chamber gradually decreases until the oil pressure in the fuel rail of the vehicle reaches a preset oil pressure threshold.

[0089] In this embodiment, the second deceleration time is the second braking time corresponding to the vehicle's fuel reduction stage. Since the braking distance of the vehicle is limited in an emergency, by using this braking time as the fuel cut-off execution condition, the timely execution of the fuel cut-off stage can be ensured, avoiding the vehicle's delay in starting to execute fuel cut-off control, thereby improving the vehicle's deceleration efficiency.

[0090] In a specific embodiment, when the fuel supply to the engine combustion chamber is completely cut off, the brake assist system of the vehicle can be provided with brake assist via the vacuum energy storage device in the vehicle.

[0091] In the event that the fuel supply to the engine combustion chamber is completely cut off, the vehicle's engine will stall. After the engine stalls, the secondary safety issue of vacuum boost failure is very likely to occur. Therefore, in the embodiments of the present application, by adding a vacuum energy storage device to the vehicle, the vacuum energy storage device can provide brake assist to the vehicle's brake assist system when the engine stalls, thus resolving the issue of vacuum boost failure after the engine stalls.

[0092] In order to more clearly illustrate the technical solution provided by the embodiment of the present application, Figure 7 The fuel cut-off control method for a vehicle provided in this application is further explained.

[0093] Figure 7 This is a schematic flow chart of a vehicle fuel cut-off control method provided by another embodiment of the present application. In this embodiment, the vehicle fuel cut-off control method is applied to Figures 1 to 5 The vehicle shown. Figure 7 As shown, the method includes: S701, obtaining vehicle driving status information.

[0094] Among them, the vehicle's driving status information may include brake pedal travel, accelerator pedal travel, steering wheel angle, vehicle speed, engine speed, oil pressure, gearbox gear, road adhesion coefficient, trigger status of the preset emergency button, etc.

[0095] S702: Determine, based on the driving state information, that the vehicle meets a fuel cut-off condition when the steering wheel angle of the vehicle is less than a first angle and the vehicle meets at least two trigger conditions.

[0096] Among them, the trigger conditions may include: the brake pedal stroke is greater than the first stroke threshold and the duration is greater than the first duration threshold; the vehicle speed is greater than the first speed threshold and the accelerator pedal stroke is greater than the second stroke threshold; the trigger state of the preset emergency button is triggered.

[0097] In this step, the driving status information may include steering wheel angle, brake pedal travel, vehicle speed, accelerator pedal travel and trigger status of a preset emergency button.

[0098] S703: Determine a torque reduction control signal and a downshift control signal corresponding to the vehicle according to the driving state information.

[0099] In this step, the driving status information may include steering wheel angle, vehicle speed, engine speed, transmission gear, brake pedal travel and road adhesion coefficient.

[0100] S704 , controlling the vehicle's engine to reduce torque according to the torque reduction control signal; and controlling the vehicle's transmission to lower gear according to the downshift control signal.

[0101] In this case, when the torque of the engine is reduced and / or the gear of the transmission is downgraded, the speed of the vehicle is reduced.

[0102] S705, when the vehicle meets the fuel reduction trigger condition, control the vehicle's fuel pump to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold and then stop executing; dynamically adjust the fuel supply to the engine combustion chamber to maintain the oil pressure in the fuel rail at the preset oil pressure threshold.

[0103] Optionally, during the execution of S704, the real-time speed of the vehicle can be monitored. When the real-time speed is less than a second speed threshold, it is determined that the vehicle meets the fuel reduction trigger condition; or, the first deceleration time of the vehicle can be monitored. When the first deceleration time is greater than or equal to a second time threshold, it is determined that the vehicle meets the fuel reduction trigger condition.

[0104] S706 , while maintaining the oil pressure of the fuel rail, if the vehicle meets the fuel cut-off execution condition, the vehicle's fuel pressure relief valve is controlled to open to completely cut off the fuel supply to the engine combustion chamber.

[0105] Optionally, while maintaining the oil pressure in the fuel rail, it can be determined whether the monitored real-time vehicle speed is less than a third speed threshold. If the real-time vehicle speed is less than the third speed threshold, it is determined that the vehicle meets the fuel cut-off execution condition; alternatively, the second deceleration time of the vehicle is monitored. If the second deceleration time is greater than or equal to the third time threshold, it is determined that the vehicle meets the fuel cut-off execution condition.

[0106] The second deceleration time is the time duration corresponding to the process in which the fuel supply to the engine combustion chamber gradually decreases until the oil pressure in the fuel rail of the vehicle reaches a preset oil pressure threshold.

[0107] S707, when the fuel supply to the engine combustion chamber is completely cut off, control the vacuum energy storage device in the vehicle to provide brake assist to the vehicle's brake assist system.

[0108] The specific implementation of the above S701-S707 has been described in detail in the above embodiments and will not be repeated here.

[0109] The technical solution of the embodiments of the present application, by acquiring vehicle driving status information, can be used to determine whether the vehicle meets the fuel cutoff conditions based on the driving status information. Therefore, if the vehicle meets the fuel cutoff conditions, the engine and transmission are used to brake the vehicle based on the corresponding torque reduction control signal and downshift control signal to reduce the vehicle's speed. This not only improves the vehicle's deceleration efficiency, but also ensures timely deceleration of the vehicle through this redundant control method, avoiding situations where poor deceleration performance due to engine or transmission failure occurs, thus providing reliable protection for the safe implementation of the subsequent fuel cutoff process. During the deceleration process, if the vehicle meets the fuel reduction triggering conditions, the vehicle's fuel pump is controlled to gradually reduce the fuel supply to the engine combustion chamber until the fuel rail oil pressure reaches a preset oil pressure threshold, and the fuel supply to the engine combustion chamber is dynamically adjusted to maintain the fuel rail oil pressure at the preset oil pressure threshold. During the dynamic adjustment of the fuel supply to the engine combustion chamber, if the vehicle meets the fuel cutoff execution conditions, the vehicle's fuel pressure relief valve is controlled to open to completely cut off the fuel supply to the engine combustion chamber. As can be seen, this technical solution divides the fuel cutoff process into two phases: fuel reduction and fuel cutoff. By gradually reducing the fuel supply to the engine combustion chamber, not only does it reduce engine output torque, rapidly reducing vehicle power and achieving engine braking, further decelerating the vehicle, but it also prevents the danger of sudden power drops. Furthermore, when the fuel rail pressure reaches a preset threshold and the fuel cutoff condition has not yet been triggered, the dynamic maintenance of the oil pressure stabilizes, preventing a sudden engine stall and thus the safety risk associated with a sudden loss of vehicle power. Once the fuel cutoff condition is triggered, the vehicle's fuel pressure relief valve opens, returning fuel from the main oil circuit to the tank, completely shutting off fuel supply to the engine and forcing the vehicle into a coasting deceleration state, thus maximizing safety for both passengers and vehicles in emergency situations. Finally, when the fuel supply to the engine combustion chamber is completely cut off, the vehicle's vacuum energy storage device provides brake assist to the vehicle's brake assist system, avoiding the problem of vacuum assist failure after engine stall. Clearly, this technical solution achieves the effect of rapidly shutting off the fuel supply while maintaining braking function in an emergency.

[0110] In addition, an embodiment of the present application also provides a fuel cut-off control device 800 for a vehicle. Figure 8 This is a schematic diagram of the structure of a vehicle fuel cut-off control device provided by an embodiment of the present application. Figure 8 As shown, the device includes: The acquisition and determination module 810 is used to obtain the vehicle's driving state information and determine whether the vehicle meets the fuel cut-off condition based on the driving state information; A first control module 820 is configured to control the vehicle to decelerate when the vehicle meets the fuel cut-off condition; The first determination and control module 830 is configured to determine whether the vehicle meets the fuel reduction trigger condition during vehicle deceleration; if so, control the vehicle's fuel pump to gradually reduce the fuel supply to the engine combustion chamber until the fuel rail pressure reaches a preset fuel pressure threshold; and dynamically adjust the fuel supply to the engine combustion chamber to maintain the fuel rail pressure at the preset fuel pressure threshold; The second judgment and control module 840 is used to judge whether the vehicle meets the fuel cut-off execution conditions during the process of dynamically adjusting the fuel supply to the engine combustion chamber; if so, control the vehicle's fuel pressure relief valve to open to completely cut off the fuel supply to the engine combustion chamber.

[0111] In a specific embodiment, the driving state information includes steering wheel angle, brake pedal travel, vehicle speed, accelerator pedal travel, and triggering state of a preset emergency button; the acquisition and determination module 810 includes: a first determining unit, configured to determine that the vehicle satisfies a fuel cutoff condition when a steering wheel angle of the vehicle is less than a first angle and the vehicle satisfies at least two triggering conditions; Among them, the trigger conditions include: the brake pedal stroke is greater than the first stroke threshold and the duration is greater than the first duration threshold; the vehicle speed is greater than the first speed threshold and the accelerator pedal stroke is greater than the second stroke threshold; the trigger state of the preset emergency button is triggered.

[0112] In one embodiment, the first determination and control module 830 includes: The first monitoring and judging unit is configured to monitor the real-time speed of the vehicle; judge whether the real-time speed is less than a second speed threshold; if so, determine that the vehicle meets the fuel reduction triggering condition; or, The second monitoring and judgment unit is used to monitor the first deceleration time of the vehicle; determine whether the first deceleration time is greater than or equal to the second time threshold; if so, determine that the vehicle meets the fuel reduction trigger condition.

[0113] In one embodiment, the first determination and control module 830 includes: a first control unit, configured to control the fuel pump to reduce its speed based on a preset PWM control signal, so as to reduce fuel supply to the vehicle; A monitoring unit for monitoring the real-time oil pressure of the fuel rail during the process of reducing the speed of the fuel pump; an execution and monitoring unit, configured to stop executing the step of controlling the vehicle's fuel pump to reduce its speed when the real-time oil pressure reaches a preset oil pressure threshold; and to monitor the vehicle's engine operating parameters; The speed adjustment unit is used to dynamically adjust the speed of the fuel pump according to the monitored real-time vehicle speed, real-time oil pressure and engine operating parameters to maintain the oil pressure in the fuel rail at a preset oil pressure threshold.

[0114] In one embodiment, the second determination and control module 840 includes: The judging and determining unit is used to judge whether the monitored real-time vehicle speed is less than a third speed threshold; if so, determine that the vehicle meets the fuel cut-off execution condition; or, The third monitoring and judgment unit is used to monitor the vehicle's second deceleration duration; determine whether the second deceleration duration is greater than or equal to a third duration threshold; if so, determine that the vehicle meets the fuel cut-off execution conditions; the second deceleration duration is: the time corresponding to the process of gradually reducing the fuel supply to the engine combustion chamber until the oil pressure in the fuel rail reaches a preset oil pressure threshold.

[0115] In a specific embodiment, the vehicle fuel cut-off control device 800 further includes: The second control module is used to control the vacuum energy storage device in the vehicle to provide brake assist to the vehicle's brake assist system when the fuel supply to the engine combustion chamber is completely cut off.

[0116] In a specific embodiment, the driving state information includes steering wheel angle, vehicle speed, engine speed, transmission gear, brake pedal travel, and road adhesion coefficient; the first control module 820 includes: a second determining unit, configured to determine a deceleration control signal corresponding to the vehicle according to the driving state information when the vehicle meets the fuel cut-off condition; The second control unit is used to control the vehicle to decelerate according to the deceleration control signal.

[0117] In a specific embodiment, the deceleration control signal includes a torque reduction control signal and a downshift control signal; the second control unit is specifically configured to: Controlling the vehicle's engine to reduce torque according to the torque reduction control signal; and controlling the vehicle's transmission to lower gear according to the downshift control signal; In this case, when the torque of the engine is reduced and / or the gear of the transmission is downgraded, the speed of the vehicle is reduced.

[0118] The technical solution provided in the embodiments of the present application obtains vehicle driving status information and can determine whether the vehicle meets the fuel cutoff conditions based on the driving status information. Once the vehicle meets the fuel cutoff conditions, the vehicle is controlled to decelerate, effectively achieving a rapid reduction in vehicle speed. This ensures that the vehicle speed is within a relatively safe range when the fuel cutoff is implemented, providing reliable protection for the safe implementation of the subsequent fuel cutoff process. During the vehicle deceleration process, if the vehicle meets the fuel reduction trigger condition, the vehicle's fuel pump is controlled to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold and stops executing. The fuel supply to the engine combustion chamber is dynamically adjusted to maintain the oil pressure in the fuel rail at the preset oil pressure threshold. During the process of dynamically adjusting the fuel supply to the engine combustion chamber, if the vehicle meets the fuel cutoff execution condition, the vehicle's fuel pressure relief valve is controlled to open to completely cut off the fuel supply to the engine combustion chamber. As can be seen, this technical solution divides the fuel cutoff process into two phases: fuel reduction and fuel cutoff. By gradually reducing the fuel supply to the engine combustion chamber, it not only reduces engine output torque to quickly reduce vehicle power, achieving the effect of engine braking and further decelerating the vehicle, but also prevents the danger of sudden power drops. Furthermore, when the fuel rail oil pressure reaches the preset oil pressure threshold and the fuel cutoff execution condition has not yet been triggered, the oil pressure is dynamically maintained to prevent sudden engine stalls, thereby avoiding the safety risks caused by a sudden loss of vehicle power. When the fuel cutoff execution condition is triggered, the vehicle's fuel pressure relief valve is opened, returning the main oil line fuel to the fuel tank, completely cutting off the engine fuel supply and forcing the vehicle into a coasting deceleration state, ensuring the greatest possible safety for both passengers and vehicles in emergency situations.

[0119] Regarding the fuel cut-off control device for a vehicle in the above embodiment, the specific manner in which each unit performs operations has been described in detail in the embodiment of the fuel cut-off control method for the vehicle, and will not be elaborated on here.

[0120] Corresponding to the methods provided in the above embodiments, based on the same technical concept, the embodiments of the present application further provide an electronic device for executing the methods provided in the above embodiments, such as Figure 9 shown.

[0121] Electronic devices may vary significantly due to different configurations or performances, and may include one or more processors 901 and memory 902. Memory 901 stores a computer program. Processor 901 is configured to execute the computer program to implement the above-described vehicle fuel cut-off control method.

[0122] It should be noted that the embodiment of the electronic device in this application and the method embodiment in this application are based on the same inventive concept, so the specific implementation of this embodiment can refer to the implementation of the corresponding method mentioned above, and the repeated parts will not be repeated.

[0123] Corresponding to the method provided in the above embodiment, based on the same technical concept, an embodiment of the present application also provides a computer-readable storage medium, which stores computer program code (including but not limited to disk storage, CD-ROM, optical storage, etc.). When the computer program code is run on a computer, the computer executes the above-mentioned related method steps to implement a vehicle fuel cut-off control method provided in the above embodiment.

[0124] An embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the above-mentioned related steps to implement the vehicle fuel cut-off control method provided by the above-mentioned embodiment.

[0125] Among them, the beneficial effects of the above embodiments can refer to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0126] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0127] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0128] In the description of this application, it should be understood that if the terms "up", "down", "front", "back", "left" and "right" are used to indicate directions or positional relationships, they are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of this application.

[0129] It should be noted that, in this application, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. It should also be noted that the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprising a..." do not exclude the presence of other identical elements in the process, method, commodity or device comprising the elements.

[0130] The above are merely embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A method for controlling fuel cut-off of a vehicle, characterized in that: include: Acquiring driving state information of a vehicle, and determining whether the vehicle meets a fuel cut-off condition based on the driving state information; When the vehicle meets the fuel cut-off condition, controlling the vehicle to decelerate; During the deceleration of the vehicle, determining whether the vehicle meets a fuel reduction trigger condition; if so, controlling the vehicle's fuel pump to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold; and dynamically adjusting the fuel supply to the engine combustion chamber to maintain the oil pressure in the fuel rail at the preset oil pressure threshold; During the process of dynamically adjusting the fuel supply to the engine combustion chamber, it is determined whether the vehicle meets the fuel cut-off execution condition; if so, the fuel pressure relief valve of the vehicle is controlled to open to completely cut off the fuel supply to the engine combustion chamber.

2. The method according to claim 1, characterized in that The driving state information includes a steering wheel angle, a brake pedal travel, a vehicle speed, an accelerator pedal travel, and a triggering state of a preset emergency button; and determining whether the vehicle meets the fuel cut-off condition based on the driving state information includes: determining that the vehicle meets the fuel cut-off condition when the steering wheel angle of the vehicle is less than a first angle and the vehicle meets at least two trigger conditions; Among them, the trigger conditions include: the brake pedal stroke is greater than the first stroke threshold and the duration is greater than the first duration threshold; the vehicle speed is greater than the first speed threshold and the accelerator pedal stroke is greater than the second stroke threshold; the trigger state of the preset emergency button is triggered.

3. The method according to claim 1, characterized in that The determining whether the vehicle meets the fuel reduction triggering condition includes: monitoring the real-time speed of the vehicle; determining whether the real-time speed is less than a second speed threshold; and if so, determining that the vehicle meets the fuel reduction trigger condition; or, Monitor a first deceleration duration of the vehicle; determine whether the first deceleration duration is greater than or equal to a second duration threshold; and if so, determine that the vehicle meets the fuel reduction trigger condition.

4. The method according to claim 3, characterized in that The step of controlling the fuel pump of the vehicle to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure of the fuel rail of the vehicle reaches a preset oil pressure threshold and then stopping the step; and dynamically adjusting the fuel supply to the engine combustion chamber so that the oil pressure of the fuel rail is maintained at the preset oil pressure threshold, includes: Based on a preset PWM control signal, controlling the fuel pump to reduce its speed so as to reduce the fuel supply to the combustion chamber of the engine; monitoring the real-time oil pressure of the fuel rail during the process of reducing the speed of the fuel pump; When the real-time oil pressure reaches the preset oil pressure threshold, stopping the step of controlling the fuel pump of the vehicle to reduce the speed; and monitoring the engine operating parameters of the vehicle; The speed of the fuel pump is dynamically adjusted according to the monitored real-time vehicle speed, the real-time oil pressure and the engine operating parameters, so that the oil pressure of the fuel rail is maintained at the preset oil pressure threshold.

5. The method according to claim 4, characterized in that The determining whether the vehicle meets the fuel cut-off execution condition includes: Determine whether the monitored real-time vehicle speed is less than a third speed threshold; if so, determine that the vehicle meets the fuel cut-off execution condition; or, Monitoring a second deceleration duration of the vehicle; determining whether the second deceleration duration is greater than or equal to a third duration threshold; and if so, determining that the vehicle meets the fuel cut-off execution condition; the second deceleration duration being the duration corresponding to the process of gradually reducing the fuel supply to the engine combustion chamber until the oil pressure in the fuel rail reaches the preset oil pressure threshold.

6. The method according to claim 1, characterized in that The method further comprises: When the fuel supply to the engine combustion chamber is completely cut off, the vacuum energy storage device in the vehicle is controlled to provide brake assist for the brake assist system of the vehicle.

7. The method according to claim 1, characterized in that The driving state information includes a steering wheel angle, a vehicle speed, an engine speed, a transmission gear, a brake pedal travel, and a road adhesion coefficient; and when the vehicle meets a fuel cut-off condition, controlling the vehicle to decelerate includes: determining a deceleration control signal corresponding to the vehicle according to the driving state information when the vehicle meets a fuel cut-off condition; The vehicle is controlled to decelerate according to the deceleration control signal.

8. The method according to claim 7, characterized in that The deceleration control signal includes a torque reduction control signal and a downshift control signal; and controlling the vehicle to decelerate according to the deceleration control signal includes: controlling the engine of the vehicle to reduce torque according to the torque reduction control signal; and controlling the transmission of the vehicle to reduce gear according to the downshift control signal; Wherein, when the torque of the engine is reduced and / or the gear position of the transmission is lowered, the speed of the vehicle is reduced.

9. A vehicle, characterized in that: The vehicle comprises an interconnected acquisition module, a control module and an actuator; the actuator comprises an interconnected fuel pump and a fuel pressure relief valve; the control module is connected to the fuel pump and the fuel pressure relief valve respectively; The acquisition module is used to collect the driving status information of the vehicle; The control module is configured to obtain the driving state information and, based on the driving state information, determine whether the vehicle satisfies a fuel cut-off condition; control the vehicle to decelerate if the vehicle satisfies the fuel cut-off condition; and during the deceleration of the vehicle, determine whether the vehicle satisfies a fuel reduction trigger condition; if so, control the vehicle's fuel pump to gradually reduce the fuel supply to the engine combustion chamber until the oil pressure in the vehicle's fuel rail reaches a preset oil pressure threshold; and dynamically adjust the fuel supply to the engine combustion chamber so that the oil pressure in the fuel rail is maintained at the preset oil pressure threshold. During the process of dynamically adjusting the fuel supply to the engine combustion chamber, it is determined whether the vehicle meets the fuel cut-off execution condition; if so, the fuel pressure relief valve of the vehicle is controlled to open to completely cut off the fuel supply to the engine combustion chamber.

10. The vehicle according to claim 9, characterized in that The actuator further includes a vacuum energy storage device; the vacuum energy storage device includes an electric vacuum pump and an energy storage module connected to each other, and the electric vacuum pump is respectively connected to the control module and the vehicle's brake boost system; The control module is further configured to control the vacuum energy storage device to provide brake assist to the vehicle's brake assist system when the fuel supply to the engine combustion chamber is completely cut off.

Images