Hybrid brake boost method, system, vehicle, and medium

Abstract

The application relates to the technical field of vehicle brake control, in particular to a hybrid brake assist method and system, a vehicle and a medium, wherein the method comprises the following steps: in response to an engine state switching instruction, determining a target state of the engine; based on a preset hybrid brake assist strategy, performing hybrid brake assist on the vehicle, and obtaining a current vacuum degree of a vacuum booster; in the case that the duration for the current vacuum degree reaching a preset vacuum degree is greater than or equal to a preset duration, determining a target assist mode according to the target state, and performing brake assist on the vehicle according to the target assist mode. Therefore, the problems that the related art lacks an engine negative pressure and electric vacuum assist collaborative control scheme, the engine negative pressure resource is not effectively utilized when the electric vacuum pump works, the power battery energy consumption is increased, and the overall energy efficiency of the brake system is reduced are solved.

Description

Technical Field

[0001] This application relates to the field of vehicle braking control technology, and in particular to a hybrid braking assist method, system, vehicle, and medium. Background Technology

[0002] Vehicle brake assist control methods are of great significance for improving driving safety and energy efficiency. Among related technologies, traditional fuel vehicles mainly rely on the engine to provide negative pressure to achieve mechanical vacuum assist, while new energy vehicles mostly use electric vacuum pumps or electromagnetic braking methods to achieve brake assist.

[0003] However, with the increasing popularity of hybrid vehicles, the relevant technologies lack control schemes to coordinate the use of engine negative pressure and electric vacuum booster. This results in the engine negative pressure resources not being effectively utilized when the electric vacuum pump is working, which increases the energy consumption of the power battery and reduces the overall energy efficiency of the braking system. Summary of the Invention

[0004] This application provides a hybrid braking assist method, system, vehicle, and medium to address the lack of a coordinated control scheme for engine negative pressure and electric vacuum assist in related technologies, which leads to the ineffective utilization of engine negative pressure resources when the electric vacuum pump is working, thereby increasing power battery energy consumption and reducing the overall energy efficiency of the braking system.

[0005] The first aspect of this application provides a hybrid braking assist method, comprising the following steps: in response to an engine state switching command, determining the target state of the engine; based on a preset hybrid braking assist strategy, performing hybrid braking assist on the vehicle and obtaining the current vacuum level of the vacuum booster; if the duration for which the current vacuum level reaches the preset vacuum level is greater than or equal to the preset duration, determining a target assist mode according to the target state, and performing braking assist on the vehicle according to the target assist mode.

[0006] Optionally, in one embodiment of this application, the method further includes: determining whether the vehicle's braking system is in an abnormal state; if the braking system is in an abnormal state, closing the vacuum pipe valve and / or the electric vacuum pump, and providing electromagnetic braking assistance to the vehicle based on a preset electromagnetic braking assistance strategy; otherwise, providing braking assistance to the vehicle based on the current state of the engine.

[0007] Optionally, in one embodiment of this application, before the duration for which the current vacuum level reaches the preset vacuum level is greater than or equal to the preset duration, the method further includes: determining the target opening degree of the vacuum tube valve in response to the target state being the working state, and controlling the vacuum tube valve according to the target opening degree; and controlling the electric vacuum pump to start in response to the target state being the non-working state.

[0008] Optionally, in one embodiment of this application, after the duration of the current vacuum level reaching the preset vacuum level is greater than or equal to the preset duration, the method further includes: turning off the electric vacuum pump in response to the target state being the working state; and turning off the vacuum tube valve in response to the target state being the non-working state.

[0009] Optionally, in one embodiment of this application, the target assist method is electric vacuum assist. Assisting the vehicle's braking according to the target assist method includes: controlling the start of an electric vacuum pump; the electric vacuum pump evacuating the vacuum booster to establish a vacuum environment; using the pressure difference of the vacuum booster to provide braking assistance to the input end of the brake master cylinder; and converting the braking assistance into braking force through the brake master cylinder and transmitting it to the brake.

[0010] Optionally, in one embodiment of this application, the target assist method is a mechanical vacuum assist method. The braking assist method for the vehicle according to the target assist method includes: opening the vacuum pipe valve; using the negative pressure of the engine to evacuate the vacuum booster to establish a vacuum environment; using the pressure difference of the vacuum booster to provide braking assist to the input end of the brake master cylinder; and converting the braking assist into braking force through the brake master cylinder and transmitting it to the brake.

[0011] Optionally, in one embodiment of this application, the target state of the engine includes an operating state or a non-operating state.

[0012] A second aspect of this application provides a hybrid braking assist system, comprising: a determining module, configured to determine a target state of the engine in response to an engine state switching command; an acquiring module, configured to provide hybrid braking assist to the vehicle based on a preset hybrid braking assist strategy and acquire the current vacuum level of the vacuum booster; and a braking module, configured to determine a target assist mode based on the target state and provide braking assist to the vehicle based on the target assist mode when the duration for which the current vacuum level reaches a preset vacuum level is greater than or equal to a preset duration.

[0013] Optionally, in one embodiment of this application, the method further includes: determining whether the vehicle's braking system is in an abnormal state; if the braking system is in an abnormal state, closing the vacuum pipe valve and / or the electric vacuum pump, and providing electromagnetic braking assistance to the vehicle based on a preset electromagnetic braking assistance strategy; otherwise, providing braking assistance to the vehicle based on the current state of the engine.

[0014] Optionally, in one embodiment of this application, the control module further includes: before the duration for which the current vacuum level reaches the preset vacuum level is greater than or equal to the preset duration, the control module is further configured to determine the target opening degree of the vacuum tube valve in response to the target state being the working state, and control the vacuum tube valve according to the target opening degree; and to control the electric vacuum pump to start in response to the target state being the non-working state.

[0015] Optionally, in one embodiment of this application, the method further includes: after the duration of the current vacuum level reaching the preset vacuum level is greater than or equal to the preset duration, the response module is used to shut down the electric vacuum pump in response to the target state being in the working state; and to close the vacuum tube valve in response to the target state being in the non-working state.

[0016] Optionally, in one embodiment of this application, the braking module is further used to control the start of the electric vacuum pump; the electric vacuum pump evacuates the vacuum booster to establish a vacuum environment; the pressure difference of the vacuum booster provides braking assistance to the input end of the brake master cylinder, and the brake master cylinder converts the braking assistance into braking force and transmits it to the brake.

[0017] Optionally, in one embodiment of this application, the braking module is further used to open the vacuum tube valve; to use the negative pressure of the engine to evacuate the vacuum booster and establish a vacuum environment; to use the pressure difference of the vacuum booster to provide braking assistance to the input end of the brake master cylinder, and to convert the braking assistance into braking force through the brake master cylinder and transmit it to the brake.

[0018] Optionally, in one embodiment of this application, the target state of the engine includes an operating state or a non-operating state.

[0019] A third aspect of this application provides a vehicle, including: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the hybrid braking assist method as described above.

[0020] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which is executed by a processor to implement the hybrid braking assist method as described above.

[0021] Therefore, this application has the following beneficial effects: First, responding to the engine's state switching command, the target state of the engine is determined, establishing a foundation for timely identification and control of changes in engine operating state, ensuring the accuracy of triggering brake assist mode switching. Second, based on a preset hybrid brake assist strategy, hybrid brake assist is applied to the vehicle, and the current vacuum level of the vacuum booster is acquired in real time, enabling dynamic control of the brake assist process and real-time monitoring of the vacuum state, providing a reliable basis for assist mode switching. Then, when the current vacuum level reaches the preset vacuum level and the duration is greater than or equal to the preset duration, the target assist mode is determined according to the target state, and the vehicle is further braked according to the target assist mode, achieving smooth switching and coordinated control between different assist modes, avoiding assist instability caused by vacuum fluctuations during brake assist switching, and improving braking continuity and safety. Thus, dynamic coordination and orderly switching between engine negative pressure assist and electric vacuum assist are achieved, solving problems such as the lack of a coordinated control scheme for engine negative pressure and electric vacuum assist in related technologies, leading to ineffective utilization of engine negative pressure resources when the electric vacuum pump is working, thereby increasing power battery energy consumption and reducing the overall energy efficiency of the braking system.

[0022] Additional aspects and advantages of this application 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 this application. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this application will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, wherein: Figure 1 This is a flowchart of a hybrid braking assist method according to an embodiment of this application; Figure 2 This is an example diagram illustrating the relationship between the hybrid brake assist system according to an embodiment of this application; Figure 3 This is a schematic diagram illustrating the operation of the electric vacuum assist method according to an embodiment of this application; Figure 4 This is a schematic diagram illustrating the operation of the mechanical vacuum assist method according to an embodiment of this application; Figure 5 This is a schematic diagram of the operation of the electromagnetic braking assist method according to an embodiment of this application; Figure 6 This is a schematic diagram of the platoon driving braking condition according to an embodiment of this application; Figure 7 This is a flowchart illustrating the specific steps of the hybrid braking assist method according to an embodiment of this application; Figure 8 This is an example diagram of a hybrid brake assist system according to an embodiment of this application; Figure 9This is a structural schematic diagram of a vehicle according to an embodiment of this application. Detailed Implementation

[0024] The embodiments of this application are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this application, and should not be construed as limiting this application.

[0025] The following description, with reference to the accompanying drawings, outlines a hybrid braking assist method, system, vehicle, and medium according to embodiments of this application. Addressing the problems mentioned in the background section, this application provides a hybrid braking assist method. In this method, firstly, in response to an engine state switching command, a target engine state is determined, establishing a foundation for timely identification and control of changes in engine operating state, ensuring the accuracy of braking assist mode switching. Secondly, based on a preset hybrid braking assist strategy, hybrid braking assist is applied to the vehicle, and the current vacuum level of the vacuum booster is acquired in real time, enabling dynamic control of the braking assist process and real-time monitoring of the vacuum state, providing a reliable basis for assist mode switching. Then, when the current vacuum level reaches a preset vacuum level and its duration is greater than or equal to a preset duration, a target assist mode is determined based on the target state, and braking assist is further applied to the vehicle according to the target assist mode, achieving smooth switching and coordinated control between different assist modes, avoiding assist instability caused by vacuum fluctuations during braking assist switching, and improving braking continuity and safety. This achieves dynamic coordination and orderly switching between engine negative pressure assist and electric vacuum assist, solving the problems of the lack of a coordinated control scheme for engine negative pressure and electric vacuum assist in related technologies, which leads to the ineffective utilization of engine negative pressure resources when the electric vacuum pump is working, thereby increasing the energy consumption of the power battery and reducing the overall energy efficiency of the braking system.

[0026] Specifically, Figure 1 This is a schematic flowchart of a hybrid braking assist method provided in an embodiment of this application.

[0027] like Figure 1 As shown, the hybrid braking assist method includes the following steps: In step S101, in response to the engine state switching command, the target state of the engine is determined.

[0028] Among them, the engine state switching command is a control signal used to trigger a change in the engine operating state. In this application, it represents the instruction information of the vehicle control system to instruct the engine to switch from the current state to another operating state. The target state of the engine is the operating mode that the engine should be in at present, as determined by the engine state switching command. In this application, it represents the working state or non-working state that the engine is ultimately set or switched to under the action of the control command.

[0029] It is understandable that by responding to the engine's state switching command and determining the engine's target state, this application can perceive changes in the power source's operating mode in real time, thereby achieving precise matching of different assist switching timings and avoiding delays or erroneous switching of the vacuum source due to changes in engine state; at the same time, it improves the real-time performance and accuracy of brake assist mode selection, ensuring that the vacuum assist system can stably output braking force under different power conditions, and reducing the risks of braking fluctuations and insufficient vacuum.

[0030] In one embodiment of this application, the target state of the engine includes an operating state or a non-operating state.

[0031] The operating state refers to the mode in which the engine is in normal ignition and continuously outputting power, which in this application represents the state in which the engine is participating in vehicle driving or maintaining operation and has the ability to generate negative pressure; the non-operating state refers to the mode in which the engine stops ignition or does not participate in power output, which in this application represents the state in which the engine does not perform effective power output and does not provide a negative pressure source for the engine.

[0032] It is understood that this application explicitly defines the engine target state as either a working state or a non-working state, making the engine state division clearer and more standardized. This facilitates the control system to quickly select the corresponding braking assist mode (mechanical vacuum assist or electric vacuum assist) according to different states, reducing state identification ambiguity, improving the determinism and execution efficiency of the control logic, and improving the response speed and execution consistency of this application during power switching by dividing the engine operating state into two categories.

[0033] In step S102, based on a preset hybrid braking assist strategy, hybrid braking assist is applied to the vehicle, and the current vacuum level of the vacuum booster is obtained.

[0034] The hybrid braking assist strategy is a set of preset control rules for selecting and switching between mechanical vacuum assist and electric vacuum assist under different engine operating conditions. In this application, it represents the control logic that coordinates the braking assist mode according to the vehicle's power state and vacuum conditions. The vacuum booster is a braking assist device that uses the pressure difference between the internal vacuum and the external atmospheric pressure to generate braking force assistance. The current vacuum level is the pressure or negative pressure state value measured inside the vacuum booster at the current moment.

[0035] It is understood that by providing braking assistance to the vehicle based on a preset hybrid braking assist strategy, the embodiments of this application can automatically select and coordinate the working modes of mechanical vacuum assist and electric vacuum assist under different engine operating conditions, thereby achieving adaptive switching and coordinated control of the braking assist source; at the same time, by obtaining the current vacuum level of the vacuum booster, the braking assist capability can be monitored in real time, providing a status basis for subsequent assist mode switching, and avoiding a decrease in braking performance due to insufficient vacuum or delayed switching.

[0036] The relationship diagram of the hybrid braking assist system in this application embodiment is as follows: Figure 2 As shown, the hybrid braking assist method in this application involves three assist strategies, including an electric vacuum assist strategy, a mechanical vacuum assist strategy, and an electromagnetic braking assist strategy.

[0037] During vehicle operation, regardless of the vehicle's operating mode, when the engine is engaged, the vehicle control system controls the opening state of the engine vacuum pipe valve in real time based on the feedback signal from the vacuum sensor. This allows the mechanical vacuum booster module to draw air from the vacuum booster using the engine's negative pressure, thereby providing braking assistance to the vehicle. When the engine switches from an in-operation state to a non-in-operation state, this application controls the electric vacuum pump to start based on the feedback signal from the vacuum sensor, so that the electric vacuum booster module pumps air to maintain the vacuum environment. After the pumping effect of the electric vacuum pump on the vacuum booster stabilizes (where the stable state is determined based on the vacuum booster's current vacuum level reaching a preset vacuum threshold and continuously meeting the preset duration, the specific determination method will be explained in detail later), during the transition phase when the engine vacuum pipe valve is still in the open state, the electric vacuum booster module and the mechanical vacuum booster module can work in an overlapping manner. After the electric vacuum booster module fully takes over the vacuum booster function and stabilizes the vacuum pressure inside the vacuum booster to the preset condition (where the stable state is determined based on the current vacuum level of the vacuum booster reaching the preset vacuum level threshold and continuously meeting the preset time, the specific determination method will be explained in detail later), the engine vacuum pipe valve is closed, thereby completing the switch from the mechanical vacuum booster module to the electric vacuum booster module.

[0038] In step S103, if the duration for which the current vacuum level reaches the preset vacuum level is greater than or equal to the preset duration, the target assistance mode is determined according to the target state, and the vehicle is braked according to the target assistance mode.

[0039] Among them, the preset vacuum degree is a target vacuum pressure threshold set to ensure the braking assist effect, and in this application, it represents a reference benchmark value for judging whether the vacuum booster has a stable braking assist capability; the duration is the continuous time interval during which the current vacuum degree is maintained above the preset vacuum degree condition; the preset duration is the minimum time threshold used to determine whether the vacuum stability state is established, and in this application, it represents the time judgment standard for ensuring that the vacuum assist system reaches stable working conditions; the target assist mode is the braking assist execution mode determined according to the target state and vacuum conditions; braking assist is the process of amplifying the braking input force through vacuum pressure difference or electric device action to assist vehicle deceleration, and in this application, it represents the process of enhancing the braking force of the braking system on the driver.

[0040] Understandably, this application introduces a dual determination mechanism of "the current vacuum level reaches the preset vacuum level and continues to meet the preset duration," so that the switching of vacuum assist is no longer based on the instantaneous state, but on the confirmed state after stability is established. This effectively avoids the problem of incorrect switching of assist mode caused by short-term fluctuations in vacuum level and improves the stability of braking control. At the same time, by dynamically selecting the target assist mode in combination with the target state, the coordinated matching of engine operation mode and braking assist mode is achieved, making the switching between mechanical vacuum assist and electric vacuum assist smoother and more reliable, reducing the risk of insufficient vacuum or assist interruption, thereby improving the continuity and safety of the vehicle's braking response.

[0041] In one embodiment of this application, before the duration for which the current vacuum level reaches the preset vacuum level is greater than or equal to the preset duration, the method further includes: determining the target opening degree of the vacuum tube valve in response to the target state being the working state, and controlling the vacuum tube valve according to the target opening degree; and controlling the electric vacuum pump to start in response to the target state being the non-working state.

[0042] Among them, the vacuum tube valve is a valve control component installed between the engine and the vacuum booster to control the airflow interruption; the target opening degree is the opening degree set by the vacuum tube valve according to the control strategy, which in this application represents the specific flow control quantity of the valve under the current operating conditions; the electric vacuum pump is an actuator that actively extracts air to form a negative pressure environment through electric drive, which in this application represents a power pumping component used to establish a vacuum environment when the engine does not provide a vacuum; the vacuum booster is a device that uses the pressure difference between the internal vacuum and the external atmospheric pressure to generate braking assistance, which in this application represents a pressure difference actuator used to amplify the braking force.

[0043] Understandably, by introducing branch control logic based on the engine's target state after vacuum stability is established, a more precise match between vacuum source control and engine operating conditions can be achieved: when the engine is running, the mechanical vacuum path can be continuously and controllably adjusted by regulating the opening of the vacuum pipe valve, improving vacuum establishment efficiency and stability; when the engine is not running, the electric vacuum pump can be started to quickly take over the electric vacuum source, thereby ensuring the vacuum booster's vacuum level remains stable, avoiding vacuum decay or supply interruption problems that may occur during the switching of a single vacuum source, improving the continuity of braking assistance, and enhancing the adaptability and reliability of the braking system under different power modes.

[0044] When the vehicle enters a working condition transition, such as when the engine switches from an operating state to a non-operating state, the engine negative pressure gradually weakens, causing the vacuum booster's internal vacuum level to gradually drop from the target value. At this time, this application controls the electric vacuum pump to start, continuously compensating for the vacuum booster by pumping air to offset the vacuum decay caused by the disappearance of engine negative pressure. The vacuum pressure inside the vacuum booster is monitored in real time by a vacuum sensor. For example, if the preset vacuum level is set to -70 kPa, when the current vacuum level is detected to reach -70 kPa, the current moment is recorded and the current vacuum level is continuously monitored. If the current vacuum level is stronger than -70 kPa (e.g., -72 kPa) and the duration reaches the preset duration (assuming 3 seconds), it is determined that the vacuum booster has entered a stable state and the electric vacuum pump has fully intervened in the vacuum level maintenance function, realizing continuous control and stable output of the vacuum boosting process. At this time, the engine vacuum pipe valve is controlled to close, isolating the engine negative pressure passage from the vacuum booster, thereby completing a smooth switch from engine negative pressure boosting to electric vacuum boosting maintenance.

[0045] Assuming the engine switches from a non-operating state to an operating state, the engine negative pressure gradually builds up and begins to act on the vacuum booster, causing the vacuum level inside the vacuum booster to gradually increase from the current maintained value and converge towards the target value. At this time, this application controls the electric vacuum pump to gradually stop working to avoid superimposing its effect with the engine negative pressure source, while the engine negative pressure continuously pumps air into the vacuum booster to restore and maintain a stable vacuum level inside the vacuum booster.

[0046] The vacuum booster's internal vacuum pressure is monitored in real time by a vacuum sensor. For example, if the preset vacuum level is -70 kPa, when the current vacuum level reaches -70 kPa, the current moment is recorded and the current vacuum level is continuously monitored. If the current vacuum level is stronger than -70 kPa (e.g., -72 kPa) and the duration reaches the preset duration (e.g., 3 seconds), it is determined that the vacuum booster has entered a stable state and the engine negative pressure has completely taken over the vacuum level maintenance function, achieving continuous control and stable output of the vacuum boosting process. At this time, the electric vacuum pump is controlled to shut down, causing it to exit the vacuum level maintenance process, thus completing a smooth switch from electric vacuum boosting to engine negative pressure boosting.

[0047] In one embodiment of this application, after the duration of the current vacuum level reaching the preset vacuum level is greater than or equal to the preset duration, the method further includes: turning off the electric vacuum pump in response to the target state being the working state; and closing the vacuum tube valve in response to the target state being the non-working state.

[0048] Understandably, after the vacuum is stably established, by controlling the closure of the electric vacuum pump and vacuum pipe valves according to the target state, the system can promptly exit the redundant vacuuming and air circuit on / off adjustment process when the engine is running and the vacuum has been stably maintained. This avoids energy waste caused by the simultaneous or repeated operation of the electric vacuum pump and mechanical vacuum source. At the same time, by closing the electric vacuum pump and vacuum pipe valves, the vacuum booster system can smoothly transition from the "establishment phase" to the "maintenance phase," reducing air circuit disturbances and pressure fluctuations, improving the vacuum stability inside the vacuum booster, thereby enhancing the continuity of braking assist output and system operating efficiency, and strengthening the overall energy consumption optimization capability of the braking system under different operating conditions.

[0049] In one embodiment of this application, the target assistance method is electric vacuum assist. Assisting the vehicle's braking according to the target assistance method includes: controlling the start of an electric vacuum pump; the electric vacuum pump evacuating the vacuum booster to establish a vacuum environment; using the pressure difference of the vacuum booster to provide braking assistance to the input end of the brake master cylinder; and converting the braking assistance into braking force through the brake master cylinder and transmitting it to the brake.

[0050] Among them, the target assist mode is the brake assist execution mode determined according to the current engine status and vacuum conditions of the vehicle, which in this application represents the control result used to select the specific brake assist source under different operating conditions; electric vacuum assist is a method of actively evacuating air by an electric vacuum pump to establish a negative pressure environment in the vacuum booster and provide brake assist; electric vacuum pump is an actuator that actively extracts air to form a vacuum environment by electric drive; vacuum booster is a pressure difference amplification device that uses the pressure difference between the internal vacuum and the external atmospheric pressure to generate brake assist; brake master cylinder is an actuator that converts the driver's brake input into hydraulic brake pressure; braking force is the force used to decelerate or stop the vehicle, which in this application represents the deceleration control force that ultimately acts on the brake actuator; brake is an actuator that converts hydraulic or mechanical force into the braking action at the vehicle wheel end, which in this application represents the actuator that ultimately achieves vehicle deceleration or stopping.

[0051] It is understood that, when the target assist method is electric vacuum assist, the embodiments of this application clearly define the complete closed-loop control process of "electric vacuum pump start-up - air extraction and pressure building - differential pressure assist - hydraulic transmission", making the establishment process of electric vacuum assist more standardized and controllable, thereby ensuring that the vacuum booster can quickly and stably form a negative pressure environment; at the same time, the assist conversion is realized by driving the brake master cylinder through differential pressure, improving the response consistency and transmission efficiency of braking force output.

[0052] A schematic diagram of the working method of the electric vacuum assist method in this application embodiment is shown below. Figure 3 As shown, the components involved include a vacuum booster, a vacuum sensor, an electric vacuum pump, an oil pressure sensor, a brake pedal, a master cylinder, and other components such as the brake. The vacuum booster is connected to the master cylinder and the vacuum sensor, and acts on the master cylinder to provide the basic conditions for brake assist. The vacuum sensor is a vacuum pressure sensor used to detect the vacuum pressure inside the vacuum booster; when the detected vacuum pressure is too low, it outputs a pressure signal.

[0053] An electric vacuum pump acts on the vacuum booster to evacuate air and establish a vacuum environment. An oil pressure sensor monitors the oil pressure in real time during brake master cylinder operation, outputting a pressure anomaly signal when an abnormality is detected.

[0054] During vehicle operation, the electric vacuum booster module switches between different engine operating states: when the engine is not in operation, the electric vacuum booster module controls the electric vacuum pump to continuously pump air from the vacuum booster to maintain the vacuum environment inside the vacuum booster, thereby achieving the braking assist function; when the engine switches from operating state to non-operating state, the electric vacuum pump intervenes in advance to compensate for the vacuum booster by pumping air to counteract the vacuum decay caused by the gradual disappearance of engine negative pressure, thereby ensuring the continuity and stability of the vacuum degree inside the vacuum booster during the switching process and avoiding insufficient or interrupted braking assist.

[0055] In one embodiment of this application, the target assistance method is a mechanical vacuum assistance method. The braking assistance of the vehicle according to the target assistance method includes: opening the vacuum pipe valve; using the negative pressure of the engine to evacuate the vacuum booster to establish a vacuum environment; using the pressure difference of the vacuum booster to provide braking assistance to the input end of the brake master cylinder; and converting the braking assistance into braking force through the brake master cylinder and transmitting it to the brake.

[0056] Among them, the mechanical vacuum assist method is a method of using the negative pressure generated during the engine intake process as a vacuum source to achieve braking assistance. In this application, it represents an assist mode that directly provides a vacuum environment based on the engine operating conditions. The negative pressure of the engine is a pressure state lower than the external atmospheric pressure generated by the airflow during the engine intake process. In this application, it represents a power source used to provide vacuum suction capability. It is understood that the embodiments of this application clarify the complete braking assist process under the mechanical vacuum assist method, enabling the engine negative pressure source to directly participate in the vacuum establishment process, thereby reducing the dependence on the external electric vacuum pump; at the same time, by controlling the opening of the engine vacuum pipe valve, efficient connection between the engine negative pressure and the vacuum booster is achieved, improving the vacuum establishment speed and stability; furthermore, the pressure difference of the vacuum booster is used to drive the brake master cylinder to output braking force, making the conversion path from mechanical energy to hydraulic energy more direct and reliable.

[0057] The mechanical vacuum booster method described in this application involves components including a vacuum booster, a vacuum sensor, a vehicle electronic control unit, an engine vacuum pipe valve, an oil pressure sensor, a brake pedal, a brake master cylinder, and other components such as the brake. A schematic diagram of the mechanical vacuum booster method is shown below. Figure 4 As shown, mechanical vacuum assist is used for brake assist control when the vehicle engine is running.

[0058] When the engine is running, the engine provides a negative pressure source. By controlling the opening of the engine vacuum pipe valve, the engine negative pressure passage is connected to the vacuum booster, thereby using the engine negative pressure to evacuate the vacuum booster to establish a vacuum environment. The vacuum booster acts on the input end of the brake master cylinder through the pressure difference formed, thereby converting the braking assistance into hydraulic braking force and transmitting it to the brake to achieve vehicle braking.

[0059] Once the engine has entered a stable operating state and fully established its negative pressure pumping capability, the electric vacuum pump is turned off to avoid interference with the engine's negative pressure source, thereby ensuring that the vacuum level inside the vacuum booster is maintained stably.

[0060] In one embodiment of this application, the method further includes: determining whether the vehicle's braking system is in an abnormal state; if the braking system is in an abnormal state, closing the vacuum pipe valve and / or the electric vacuum pump, and providing electromagnetic braking assistance to the vehicle based on a preset electromagnetic braking assistance strategy; otherwise, providing braking assistance to the vehicle based on the current state of the engine.

[0061] The braking system is an integrated braking device system used to achieve vehicle deceleration or stopping. In this application, it represents a braking control and execution set composed of a vacuum booster system, a hydraulic braking system, and an electromagnetic braking actuator. The abnormal state is an operating state in which any key component of the braking system fails, has abnormal performance, or has parameters exceeding the normal range. In this application, it represents the liquid pressure value of the brake oil line being lower than the liquid pressure threshold and the vacuum degree of the vacuum sensor being lower than the vacuum degree threshold (which can be set according to specific operating conditions). The electromagnetic braking booster strategy is a braking control scheme that directly outputs braking force through the electromagnetic brake in the event of failure of the vacuum booster system. It is a braking method that directly generates braking force through electromagnetic action to achieve vehicle deceleration. In this application, it represents a direct braking execution mode that does not rely on vacuum or hydraulic booster. The current state of the engine is the actual operating mode of the engine at the current moment.

[0062] It is understood that the embodiments of this application introduce an abnormal state determination mechanism for the braking system to achieve real-time monitoring and risk identification of the operational reliability of the vacuum booster system. This allows for timely closure of the vacuum pipe valve and / or electric vacuum pump when an abnormality is detected, preventing the continued spread of the fault state from further affecting the vacuum booster effect. Simultaneously, by switching to electromagnetic braking booster mode, the braking system can maintain basic braking capability even in the event of vacuum booster failure, constructing a braking redundancy protection path and improving the system's fault tolerance and safety lower limit. In non-abnormal situations, the corresponding braking booster mode is selected based on the current engine state to achieve efficient braking control under normal operating conditions. This significantly improves the safety, reliability, and failure protection capability of the entire vehicle braking system while ensuring the continuity of braking performance.

[0063] In one embodiment of this application, braking control is performed based on the operating state of the braking system. Specifically, it is first determined whether the vehicle's braking system is in an abnormal state. The fluid pressure value of the brake fluid line and the vacuum degree of the vacuum sensor are monitored throughout the process. If the fluid pressure value of the brake fluid line is lower than a preset fluid pressure threshold and / or the vacuum degree detected by the vacuum sensor is lower than a preset vacuum degree threshold, then the braking system is determined to be in an abnormal state.

[0064] When the braking system is determined to be in an abnormal state, the electric vacuum booster and mechanical vacuum booster braking operations are stopped, and the vacuum pipe valve and / or electric vacuum pump are closed. Based on the preset electromagnetic braking booster strategy, electromagnetic braking booster is applied to the vehicle.

[0065] Specifically, the working diagram of the electromagnetic braking assist method in this application embodiment is as follows: Figure 5 As shown, the components involved include the brake pedal, brake pedal travel sensor, electronic control unit, and electromagnetic brake. Electromagnetic brake assist is used to achieve redundant brake control when the braking system malfunctions.

[0066] In electromagnetic brake assist, the brake pedal travel sensor is used to identify the driver's braking intention and transmit the identified electrical signal to the electronic control unit; the electronic control unit is used to receive and judge the electrical signal transmitted by the brake pedal travel sensor and control the braking force output of the electromagnetic brake; the electromagnetic brake is used to receive the control signal from the electronic control unit and output braking force.

[0067] In addition, in platoon driving mode, electromagnetic brake assist also involves wheel speed sensors and radar sensors. A schematic diagram of the platoon driving braking operation is shown below. Figure 6 As shown, wheel speed sensors and radar sensors are used to acquire information on the vehicle's driving status and the distance between vehicles in front and behind. These sensors, in conjunction with the anti-lock braking system (ABS), are adjusted by an electromagnetic brake to achieve safe distance control. The ABS is a braking control system used to prevent wheel lock-up and maintain wheel rolling during vehicle braking by adjusting brake pressure. In this application, it represents a control unit that works in conjunction with electromagnetic brake assist to improve vehicle braking stability and safety.

[0068] In summary, the flowchart of the specific steps of the hybrid braking assist method in this application embodiment is as follows: Figure 7 As shown: In step S201, the vehicle starts and receives the vehicle operating mode selected by the driver, the vehicle operating mode being used to determine the basic operating state of the subsequent braking assist strategy; In step S202, the corresponding braking assist mode is determined according to the vehicle operating mode and the current state of the engine. When the engine is in working state, the system is controlled to enter the mechanical vacuum assist mode, in which the engine negative pressure is used to evacuate the vacuum booster to form braking assist. When the engine is not in working state, the system is controlled to enter the electric vacuum assist mode, in which the electric vacuum pump is used to evacuate the vacuum booster to maintain braking assist. During the above process, the oil pressure sensor and vacuum sensor monitor the operating status of the braking system in real time to determine whether there is an abnormal state. In this application, the abnormal state refers to the liquid pressure of the brake oil line being lower than a preset liquid pressure threshold and / or the vacuum degree detected by the vacuum sensor being lower than a preset vacuum threshold. In step S203, if no abnormal state of the braking system is detected, the corresponding braking assist mode is continuously executed according to the current working state of the engine, and the oil pressure and vacuum status are monitored in real time, and then the process proceeds to step S204; otherwise, the process proceeds to step S210. At this time, it is determined that neither the mechanical vacuum assist mode nor the electric vacuum assist mode can meet the braking requirements. The control system stops the above two assist modes and switches to the electromagnetic braking mode to perform braking control. The driver's braking intention is obtained by the brake pedal travel sensor, and the braking force is output by the electromagnetic brake, thereby achieving redundancy protection of the braking system. In step S204, the engine is controlled to exit the current braking engagement state and send a stop signal to the control unit. At the same time, the electric vacuum pump of the electric vacuum booster module is started to intervene in advance to compensate for the vacuum booster and control the engine vacuum pipe valve to close, so as to isolate the engine negative pressure from the vacuum booster and ensure the continuity of braking assistance. Then proceed to step S205 to re-detect the status of the braking system. If step S205 detects an abnormality, proceed to step S210; if step S205 detects no abnormality, return to the normal braking assist process. In step S206, the electric vacuum-assisted braking process corresponding to the engine not operating continues to run; In step S207, the status of the braking system continues to be monitored using the oil pressure sensor and the vacuum sensor; If an abnormality is detected in step S207, proceed to step S210; if no abnormality is detected in step S207, continue to maintain the electric vacuum assist mode and perform status monitoring, then proceed to step S208. In step S208, the electric vacuum pump is controlled to stop working and a stop signal is sent. At the same time, the engine is controlled to restart and the engine vacuum pipe valve is opened, so that the engine negative pressure takes over the vacuum booster pumping process again, realizing the switch from electric vacuum booster to mechanical vacuum booster. Then, the process proceeds to step S209. In step S209, the status of the braking system is reconfirmed; If an abnormality is detected in step S209, proceed to step S210 to switch to electromagnetic braking mode to perform braking control; if no abnormality is detected in step S209, return to the normal braking assist process. The process is now complete.

[0069] According to the hybrid braking assist method proposed in this application, firstly, in response to the engine's state switching command, the target state of the engine is determined, establishing a foundation for timely identification and control of changes in engine operating state, ensuring the accuracy of triggering braking assist mode switching; secondly, based on a preset hybrid braking assist strategy, hybrid braking assist is applied to the vehicle, and the current vacuum level of the vacuum booster is acquired in real time, realizing dynamic control of the braking assist process and real-time monitoring of the vacuum state, providing a reliable basis for assist mode switching; then, when the current vacuum level reaches a preset vacuum level and the duration is greater than or equal to a preset duration, the target assist mode is determined according to the target state, and the vehicle is further braked according to the target assist mode, realizing smooth switching and coordinated control between different assist modes, avoiding assist instability caused by vacuum fluctuations during braking assist switching, and improving braking continuity and safety. Thus, dynamic coordination and orderly switching between engine negative pressure assist and electric vacuum assist are achieved, solving the problems of related technologies lacking a coordinated control scheme for engine negative pressure and electric vacuum assist, resulting in ineffective utilization of engine negative pressure resources when the electric vacuum pump is working, thereby increasing power battery energy consumption and reducing the overall energy efficiency of the braking system.

[0070] Next, the hybrid braking assist system proposed according to the embodiments of this application is described with reference to the accompanying drawings.

[0071] Figure 8 This is a block diagram of a hybrid braking assist system according to an embodiment of this application.

[0072] like Figure 2 As shown, the hybrid braking assist system 10 includes: a determination module 100, an acquisition module 200, and a braking module 300.

[0073] Optionally, in one embodiment of this application, the system further includes: a determination module for determining whether the vehicle's braking system is in an abnormal state; if the braking system is in an abnormal state, closing the vacuum pipe valve and / or the electric vacuum pump, and providing electromagnetic braking assistance to the vehicle based on a preset electromagnetic braking assistance strategy; otherwise, providing braking assistance to the vehicle based on the current state of the engine.

[0074] Optionally, in one embodiment of this application, the method further includes: before the duration for which the current vacuum level reaches the preset vacuum level is greater than or equal to the preset duration, the control module is configured to determine the target opening degree of the vacuum tube valve in response to the target state being in the working state, and control the vacuum tube valve according to the target opening degree; and to control the electric vacuum pump to start in response to the target state being in the non-working state.

[0075] Optionally, in one embodiment of this application, the method further includes: after the duration of the current vacuum level reaching the preset vacuum level is greater than or equal to the preset duration, the response module is used to shut down the electric vacuum pump in response to the target state being in the working state; and to close the vacuum tube valve in response to the target state being in the non-working state.

[0076] Optionally, in one embodiment of this application, the braking module 300 is further used to control the start of the electric vacuum pump; the electric vacuum pump evacuates the vacuum booster to establish a vacuum environment; the pressure difference of the vacuum booster provides braking assistance to the input end of the brake master cylinder, and the brake master cylinder converts the braking assistance into braking force and transmits it to the brake.

[0077] Optionally, in one embodiment of this application, the braking module 300 is further used to open the vacuum tube valve; use the negative pressure of the engine to evacuate the vacuum booster to establish a vacuum environment; use the pressure difference of the vacuum booster to provide braking assistance to the input end of the brake master cylinder, and convert the braking assistance into braking force through the brake master cylinder and transmit it to the brake.

[0078] Optionally, in one embodiment of this application, the target state of the engine includes an operating state or a non-operating state.

[0079] It should be noted that the foregoing explanation of the hybrid braking assist method embodiment also applies to the hybrid braking assist system of this embodiment, and will not be repeated here.

[0080] According to the hybrid brake assist system proposed in this application, firstly, in response to the engine state switching command, the target state of the engine is determined, establishing a foundation for timely identification and control of changes in engine operating state, ensuring the accuracy of triggering brake assist mode switching; secondly, based on a preset hybrid brake assist strategy, hybrid brake assist is applied to the vehicle, and the current vacuum level of the vacuum booster is acquired in real time, realizing dynamic control of the brake assist process and real-time monitoring of the vacuum state, providing a reliable basis for assist mode switching; then, when the current vacuum level reaches the preset vacuum level and the duration is greater than or equal to the preset duration, the target assist mode is determined according to the target state, and the vehicle is further braked according to the target assist mode, realizing smooth switching and coordinated control between different assist modes, avoiding assist instability caused by vacuum fluctuations during brake assist switching, and improving braking continuity and safety. Thus, dynamic coordination and orderly switching between engine negative pressure assist and electric vacuum assist are achieved, solving the problems of related technologies lacking a coordinated control scheme for engine negative pressure and electric vacuum assist, resulting in ineffective utilization of engine negative pressure resources when the electric vacuum pump is working, thereby increasing power battery energy consumption and reducing the overall energy efficiency of the braking system.

[0081] Figure 9 A schematic diagram of the structure of a vehicle provided in an embodiment of this application. The vehicle may include: The memory 901, the processor 902, and the computer program stored on the memory 901 and capable of running on the processor 902.

[0082] When processor 902 executes the program, it implements the hybrid braking assist method provided in the above embodiments.

[0083] Furthermore, the vehicle also includes: Communication interface 903 is used for communication between memory 901 and processor 902.

[0084] The memory 901 is used to store computer programs that can run on the processor 902.

[0085] The memory 901 may include high-speed RAM (Random Access Memory) memory, and may also include non-volatile memory, such as at least one disk storage.

[0086] If the memory 901, processor 902, and communication interface 903 are implemented independently, then the communication interface 903, memory 901, and processor 902 can be interconnected via a bus to complete communication between them. The bus can be an ISA (Industry Standard Architecture) bus, a PCI (Peripheral Component Interconnect) bus, or an EISA (Extended Industry Standard Architecture) bus, etc. The bus can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 9 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0087] Optionally, in a specific implementation, if the memory 901, processor 902, and communication interface 903 are integrated on a single chip, then the memory 901, processor 902, and communication interface 903 can communicate with each other through an internal interface.

[0088] The processor 902 may be a CPU (Central Processing Unit), an ASIC (Application Specific Integrated Circuit), or one or more integrated circuits configured to implement the embodiments of this application.

[0089] This application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the above-described hybrid braking assist method.

[0090] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0091] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0092] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or N executable instructions for implementing custom logic functions or processes, and the scope of the preferred embodiments of this application includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as should be understood by those skilled in the art to which embodiments of this application pertain.

[0093] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any of the following techniques known in the art, or a combination thereof: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (FPGAs), field-programmable gate arrays (FPGAs), etc.

[0094] Those skilled in the art will understand that all or part of the steps of the methods implementing the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0095] Although embodiments of this application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this application. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of this application.

Claims

1. A hybrid braking assist method, characterized in that, Includes the following steps: In response to an engine state switching command, the target state of the engine is determined; Based on a preset hybrid braking assist strategy, hybrid braking assist is applied to the vehicle, and the current vacuum level of the vacuum booster is obtained. If the duration for which the current vacuum level reaches the preset vacuum level is greater than or equal to the preset duration, a target assistance mode is determined based on the target state, and braking assistance is applied to the vehicle based on the target assistance mode.

2. The hybrid braking assist method according to claim 1, characterized in that, Also includes: Determine whether the vehicle's braking system is in an abnormal state; If the braking system is in the abnormal state, the vacuum pipe valve and / or the electric vacuum pump are closed, and electromagnetic braking assistance is provided to the vehicle based on a preset electromagnetic braking assistance strategy; otherwise, braking assistance is provided to the vehicle according to the current state of the engine.

3. The hybrid braking assist method according to claim 1, characterized in that, Before the current vacuum level reaches the preset vacuum level for a duration greater than or equal to the preset duration, the method further includes: In response to the target state being the working state, the target opening degree of the vacuum tube valve is determined, and the vacuum tube valve is controlled according to the target opening degree; In response to the target state being non-working, the electric vacuum pump is controlled to start.

4. The hybrid braking assist method according to claim 1, characterized in that, After the current vacuum level reaches the preset vacuum level for a duration greater than or equal to the preset duration, the method further includes: In response to the target state being the working state, the electric vacuum pump is turned off; In response to the target state being non-operating, the vacuum tube valve is closed.

5. The hybrid braking assist method according to claim 1, characterized in that, The target assistance method is electric vacuum assistance, and the step of providing braking assistance to the vehicle according to the target assistance method includes: Control the start of the electric vacuum pump; The electric vacuum pump evacuates the vacuum booster to create a vacuum environment; The pressure difference of the vacuum booster is used to provide braking assistance to the input end of the brake master cylinder, and the brake master cylinder converts the braking assistance into braking force and transmits it to the brake.

6. The hybrid braking assist method according to claim 1, characterized in that, The target assistance method is a mechanical vacuum assistance method, and the step of providing braking assistance to the vehicle according to the target assistance method includes: Open the vacuum tube valve; The vacuum environment is established by using the negative pressure of the engine to evacuate the vacuum booster. The pressure difference of the vacuum booster is used to provide braking assistance to the input end of the brake master cylinder, and the brake master cylinder converts the braking assistance into braking force and transmits it to the brake.

7. The hybrid braking assist method according to claim 1, characterized in that, The target state of the engine includes an operating state or a non-operating state.

8. A hybrid braking assist system, characterized in that, include: A determination module is used to determine the target state of the engine in response to an engine state switching command; The acquisition module is used to provide hybrid braking assistance to the vehicle based on a preset hybrid braking assistance strategy and to acquire the current vacuum level of the vacuum booster. The braking module is used to determine a target assistance mode based on the target state and to provide braking assistance to the vehicle based on the target assistance mode when the duration for which the current vacuum level reaches the preset vacuum level is greater than or equal to the preset duration.

9. A vehicle, characterized in that, include: Storage hardware, a processor, and a computer program stored on the storage hardware and executable on the processor, the processor executing the program to implement the hybrid braking assist method as described in any one of claims 1-7.

10. A computer-readable storage medium having a computer program or instructions stored thereon, characterized in that, When the computer program or instructions are executed, they implement the hybrid braking assist method according to any one of claims 1-7.

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