CN113335256A - Auxiliary braking method, equipment, storage medium and device for automobile - Google Patents
Auxiliary braking method, equipment, storage medium and device for automobile Download PDFInfo
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- CN113335256A CN113335256A CN202110782080.0A CN202110782080A CN113335256A CN 113335256 A CN113335256 A CN 113335256A CN 202110782080 A CN202110782080 A CN 202110782080A CN 113335256 A CN113335256 A CN 113335256A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
Abstract
The invention discloses an automobile auxiliary braking method, equipment, a storage medium and a device, wherein the method comprises the following steps: determining the state of a vacuum system of a vehicle to be maintained, detecting whether a braking instruction is received or not when the state is in a failure state, and recovering braking energy when the braking instruction is received so as to realize auxiliary braking of the vehicle; according to the invention, the braking energy is recovered when the vacuum system of the vehicle to be maintained is in the failure state and the braking instruction is received, so that the braking force recovered by additionally increasing the braking energy is used for assisting braking when the vacuum booster of the hydraulic braking system fails and braking is required, the braking efficiency is improved, and the safety of the vehicle is ensured.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to an automobile auxiliary braking method, equipment, a storage medium and a device.
Background
Currently, hydraulic brake systems for automobiles generally use a vacuum booster to increase the force applied to a pedal by a driver to improve the braking effect.
However, in actual use, the vacuum booster may fail, and the braking deceleration may be excessively small, which is likely to cause danger.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide an automobile auxiliary braking method, equipment, a storage medium and a device, and aims to solve the technical problem that in the prior art, when a vacuum booster of a hydraulic braking system fails, the braking deceleration is too small, and danger is easy to occur.
In order to achieve the above object, the present invention provides an auxiliary braking method for a vehicle, the method comprising:
determining a state of a vacuum system of a vehicle to be maintained;
when the state is a failure state, detecting whether a braking instruction is received;
and when a braking instruction is received, the braking energy is recovered to realize the auxiliary braking of the automobile.
Optionally, the determining the state of the vacuum system of the vehicle to be maintained comprises:
acquiring the current vacuum degree of a vacuum cylinder of a vehicle to be maintained;
and determining the state of the vacuum system of the vehicle to be maintained according to the corresponding relation between the current vacuum degree and the preset vacuum degree interval and the state of the vacuum system.
Optionally, the performing braking energy recovery comprises:
acquiring braking energy recovery system information, and determining a maximum anti-drag torque value according to the braking energy recovery system information;
and recovering the braking energy based on the maximum anti-dragging torque value.
Optionally, the performing braking energy recovery comprises:
acquiring the weight of a vehicle to be maintained, and searching a target anti-dragging torque value corresponding to the weight from a preset torque table;
and recovering the braking energy based on the target anti-dragging torque value.
Optionally, after determining the state of the vacuum system of the vehicle to be maintained, the method further comprises:
when the state is a normal state, detecting whether a braking instruction is received;
and when a braking instruction is received, acquiring the current vehicle speed, and recovering braking energy according to the current vehicle speed and the braking instruction.
Optionally, after determining the state of the vacuum system of the vehicle to be maintained, the method further comprises:
when the state is an abnormal state, detecting whether the vehicle to be maintained is in a pre-starting state;
and when the vehicle to be maintained is not in the pre-starting state, setting a start prohibition identifier to prohibit the vehicle to be maintained from entering the pre-starting state.
Optionally, after the start prohibition flag is set, the method further includes:
controlling an electronic vacuum pump of the vehicle to be maintained to start to operate so as to adjust the current vacuum degree;
and when the adjusted current vacuum degree is detected to be smaller than or equal to a preset removal threshold value, controlling the electronic vacuum pump to stop running, and removing the start prohibition identification so as to allow the vehicle to be maintained to enter a pre-start state.
In addition, in order to achieve the above object, the present invention further provides a vehicle auxiliary braking device, which includes a memory, a processor, and a vehicle auxiliary braking program stored in the memory and operable on the processor, wherein the vehicle auxiliary braking program is configured to implement the vehicle auxiliary braking method as described above.
In addition, to achieve the above object, the present invention further provides a storage medium, which stores a vehicle auxiliary braking program, and the vehicle auxiliary braking program, when executed by a processor, implements the vehicle auxiliary braking method as described above.
In addition, in order to achieve the above object, the present invention also provides an auxiliary brake apparatus for a vehicle, including: the brake system comprises a state determining module, an instruction detecting module and an auxiliary braking module;
the state determination module is used for determining the state of a vacuum system of the vehicle to be maintained;
the command detection module is used for detecting whether a braking command is received or not when the state is a failure state;
and the auxiliary braking module is used for recovering braking energy when receiving a braking instruction so as to realize auxiliary braking of the automobile.
According to the invention, the state of the vacuum system of the vehicle to be maintained is determined, whether a braking instruction is received is detected when the state is in an invalid state, and the braking energy is recovered when the braking instruction is received, so that the braking force for recovering the braking energy can be additionally increased for auxiliary braking, the braking efficiency is improved, and the safety of the vehicle is ensured.
Drawings
FIG. 1 is a schematic diagram of an automotive auxiliary brake device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a first embodiment of an auxiliary braking method for a vehicle according to the present invention;
FIG. 3 is a schematic diagram of a braking system according to an embodiment of the auxiliary braking method for a vehicle of the present invention;
FIG. 4 is a schematic flow chart illustrating a second embodiment of an auxiliary braking method for a vehicle according to the present invention;
FIG. 5 is a schematic flow chart illustrating a third exemplary embodiment of an auxiliary braking method for a vehicle according to the present invention;
FIG. 6 is a schematic flow chart illustrating a fourth embodiment of an auxiliary braking method for a vehicle according to the present invention;
FIG. 7 is a schematic flow chart illustrating a fifth embodiment of an auxiliary braking method for a vehicle according to the present invention;
fig. 8 is a block diagram showing the construction of the first embodiment of the auxiliary brake apparatus for a vehicle according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an auxiliary braking device of an automobile in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the auxiliary braking apparatus for a vehicle may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), and the optional user interface 1003 may further include a standard wired interface and a wireless interface, and the wired interface for the user interface 1003 may be a USB interface in the present invention. The network interface 1004 may optionally include a standard wired interface, a Wireless interface (e.g., a Wireless-Fidelity (Wi-Fi) interface). The Memory 1005 may be a Random Access Memory (RAM) or a Non-volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in FIG. 1 does not constitute a limitation of the auxiliary brake device of a vehicle and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in FIG. 1, memory 1005, identified as one type of computer storage medium, may include an operating system, a network communication module, a user interface module, and a vehicle auxiliary brake program.
In the vehicle auxiliary brake device shown in fig. 1, the network interface 1004 is mainly used for connecting a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting user equipment; the vehicle auxiliary braking device calls a vehicle auxiliary braking program stored in the memory 1005 through the processor 1001 and executes the vehicle auxiliary braking method provided by the embodiment of the invention.
Based on the hardware structure, the embodiment of the auxiliary braking method for the automobile is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a first embodiment of an automobile auxiliary braking method according to the present invention, and provides the first embodiment of the automobile auxiliary braking method according to the present invention.
Step S10: the state of the vacuum system of the vehicle to be serviced is determined.
It should be understood that the main body of the method of this embodiment may be a computing service device with data processing, network communication, and program running functions, such as a Vehicle Control Unit (VCU), or other electronic devices capable of implementing the same or similar functions, which is not limited in this embodiment.
It should be noted that the vehicle in the present invention may be a new energy vehicle, and the new energy vehicle is provided with a braking system. For ease of understanding, the description will be made with reference to fig. 3, but this scheme is not limited thereto. Fig. 3 is a schematic diagram of a braking system, which is composed of a vacuum booster, a brake pedal, a brake switch, an electronic vacuum pump, a vacuum cylinder, a vacuum pump controller, a vehicle control unit, a driving motor and a power battery device. Wherein, the vacuum booster is arranged on the brake pedal and used for increasing the force applied on the pedal by the driver so as to improve the braking effect; the brake switch is arranged on a brake pedal and connected with the vehicle control unit to transmit a signal whether the brake pedal touches the vehicle control unit or not; the vacuum cylinder is connected with the vacuum booster through a vacuum hose; the electronic vacuum pump is connected with the vacuum cylinder and used for vacuumizing the vacuum cylinder; the vacuum pump controller is arranged on the vacuum cylinder and can monitor the vacuum degree of the vacuum cylinder in real time; the vacuum pump controller converts the monitored vacuum degree into an electric signal and sends the electric signal to the vehicle control unit and the electronic vacuum pump; the vehicle control unit controls the driving motor to recover braking energy, and the electric energy recovered by the motor is stored in the power battery.
It is understood that the state of the vacuum system may be a failure state, an abnormal state, or a normal state. When the state of the vacuum system is a failure state, the failure of the vacuum booster is explained; when the state of the vacuum system is an abnormal state, the abnormal work of the vacuum booster is explained; when the state of the vacuum system is an abnormal state, the vacuum booster is proved to work normally.
It should be appreciated that determining the state of the vacuum system of the vehicle to be maintained may be by the vacuum pump controller directly monitoring the vacuum pump information of the electronic vacuum pump and determining the state of the vacuum system of the vehicle to be maintained from the vacuum pump information. Wherein the vacuum pump information is used to indicate the status of the vacuum pump.
Step S20: and when the state is a failure state, detecting whether a braking instruction is received.
It should be noted that the braking command may be issued by a user through a brake pedal. For example, a user may depress a brake pedal to issue a braking command when braking is desired.
It should be understood that the detection of whether the braking instruction is received may be detection of whether a touch signal of the brake pedal uploaded by the brake switch is received, and when the touch signal of the brake pedal is received, it is determined that the braking instruction is received; and when the touch signal of the brake pedal is not received, judging that the brake command is not received.
Step S30: and when a braking instruction is received, the braking energy is recovered to realize the auxiliary braking of the automobile.
It should be understood that when the state of the vacuum system is a failure state, it indicates that the vacuum booster fails, and at this time, the force applied to the pedal by the driver cannot be increased by the vacuum booster, so that when the user needs braking, the force applied to the pedal is too small, and further, the braking force is too small, which is easy to cause danger. Therefore, the braking energy recovery is needed to perform auxiliary braking through the extra braking force generated by the braking energy recovery, so as to improve the braking efficiency and ensure the safety of the vehicle
It will be appreciated that on receipt of a braking command, the recovery of braking energy may be a preset anti-drag torque applied to the drive motor, together with the mechanical braking system, to slow the vehicle. Wherein the preset anti-drag torque can be preset.
According to the embodiment, the state of the vacuum system of the vehicle to be maintained is determined, whether a braking instruction is received or not is detected when the state is in the failure state, and the braking energy is recovered when the braking instruction is received, so that the braking force for recovering the braking energy can be additionally increased to perform auxiliary braking, the braking efficiency is improved, and the safety of the vehicle is ensured.
Referring to fig. 4, fig. 4 is a schematic flow chart of a vehicle auxiliary braking method according to a second embodiment of the present invention, and the vehicle auxiliary braking method according to the second embodiment of the present invention is proposed based on the first embodiment shown in fig. 2.
In the second embodiment, the step S10 includes:
step S101: and acquiring the current vacuum degree of a vacuum cylinder of the vehicle to be maintained.
It will be appreciated that the current vacuum level of the vacuum canister may be used to determine the status of the vacuum system of the vehicle to be serviced.
It should be appreciated that the vehicle control unit may obtain the current vacuum level of the vacuum canister of the vehicle to be serviced in real time via the vacuum pump controller.
Step S102: and determining the state of the vacuum system of the vehicle to be maintained according to the corresponding relation between the current vacuum degree and the preset vacuum degree interval and the state of the vacuum system.
It should be noted that the corresponding relationship between the preset vacuum degree interval and the vacuum system state may be preset according to actual requirements, and in this embodiment and other embodiments, specific contents thereof are not limited.
For ease of understanding, table 1 is an exemplary embodiment showing a correspondence:
TABLE 1 corresponding relationship between vacuum degree interval and vacuum system state
| Interval of vacuum degree | [-80kPa，-60kPa] | (-60kPa，-20kPa] | (-20kPa，0kPa) |
| Vacuum system status | Normal state | Abnormal state | Failure state |
For example, in the example shown in Table 1, the vacuum level may be divided into three intervals: the vacuum system state of [ -80kPa, -60kPa ], (-60kPa, -20kPa ], (-20kPa, 0kPa), wherein the vacuum system state of [ -80kPa, -60kPa ] is a normal state, the vacuum system state of (-60kPa, -20kPa ] is an abnormal state, and the vacuum system state of (-20kPa, 0kPa) is a failure state.
Referring to table 1, in a specific implementation, determining the state of the vacuum system of the vehicle to be maintained according to the current vacuum degree may be determining a vacuum degree interval in which the current vacuum degree is located, and then searching for the state of the vacuum system corresponding to the vacuum degree interval according to table 1.
For example, when the current vacuum degree is less than or equal to-60 kPa, the state of the vacuum system is determined to be a normal state; when the current vacuum degree is less than or equal to minus 20kPa and minus 60kPa, determining the state of the vacuum system as an abnormal state; and when the current vacuum degree is less than 0kPa under the condition of-20 kPa, determining the state of the vacuum system as a failure state.
The second embodiment determines the state of the vacuum system of the vehicle to be maintained according to the current vacuum degree, the preset vacuum degree interval and the corresponding relation between the vacuum system state and the current vacuum degree by acquiring the current vacuum degree of the vacuum cylinder of the vehicle to be maintained, so that the state of the vacuum system of the vehicle to be maintained can be more accurately determined, and whether the vehicle to be maintained needs auxiliary braking can be better judged.
In the second embodiment, the step S30 includes:
step S301: and when a braking instruction is received, acquiring braking energy recovery system information, and determining a maximum anti-drag torque value according to the braking energy recovery system information.
It should be noted that the braking energy recovery system information may be model information of the braking energy recovery system, and the like.
It should be appreciated that the maximum anti-drag torque values that can be generated by different models of braking energy recovery systems are different. Therefore, the maximum anti-drag torque value needs to be determined according to the model information of the braking energy recovery system.
It can be understood that the determining the maximum anti-drag torque value according to the braking energy recovery system information may be searching a preset anti-drag torque value table for the maximum anti-drag torque value corresponding to the braking energy recovery system information. The preset anti-drag torque value table comprises a corresponding relation between the braking energy recovery system information and the maximum anti-drag torque value, and the corresponding relation between the braking energy recovery system information and the maximum anti-drag torque value can be preset by a manager of the automobile auxiliary braking equipment.
Step S302: and recovering braking energy based on the maximum anti-dragging torque value so as to realize auxiliary braking of the automobile.
It should be appreciated that brake energy recovery based on the maximum anti-drag torque value may apply the anti-drag torque of the maximum anti-drag torque value to the drive motor, along with the mechanical brake system, to rapidly decelerate the vehicle.
In the second embodiment, when a braking instruction is received, the information of the braking energy recovery system is acquired, the maximum drag torque value is determined according to the information of the braking energy recovery system, and the braking energy is recovered based on the maximum drag torque value to realize the auxiliary braking of the automobile, so that the braking energy can be recovered based on the maximum drag torque value, and the braking force of the auxiliary braking is improved to realize the quick braking.
Referring to fig. 5, fig. 5 is a schematic flow chart of a vehicle auxiliary braking method according to a third embodiment of the present invention, and the vehicle auxiliary braking method according to the third embodiment of the present invention is proposed based on the first embodiment shown in fig. 2.
In the third embodiment, the step S30 includes:
step S301': and when a braking instruction is received, acquiring the weight of the vehicle to be maintained, and searching a target anti-dragging torque value corresponding to the weight from a preset torque table.
It can be understood that when the weight of the vehicle to be maintained is less than the preset full load weight, the maximum anti-drag torque value is adopted for recovering the braking energy, and the defect of overlarge braking force may exist. Therefore, the anti-dragging torque value can be adaptively adjusted according to the weight of the vehicle to be maintained, so as to ensure that the braking deceleration is not too large. The preset full load weight may be a full load weight value of the vehicle, or may be preset by a user. For example, the user may preset any one of 5.5t-6t as a preset full load weight.
It should be noted that the preset torque table includes a corresponding relationship between the weight and the anti-drag torque value, and the corresponding relationship between the weight and the anti-drag torque value may be preset by a manager of the auxiliary braking device of the vehicle.
Step S302': and recovering braking energy based on the target anti-dragging torque value so as to realize auxiliary braking of the automobile.
It should be appreciated that recovering braking energy based on the target anti-drag torque value may apply an anti-drag torque of the target anti-drag torque value to the drive motor to rapidly decelerate the vehicle in conjunction with the mechanical braking system.
In the third embodiment, when a braking instruction is received, the weight of the vehicle to be maintained is acquired, the target anti-dragging torque value corresponding to the weight of the vehicle to be maintained is searched, and braking energy is recovered based on the target anti-dragging torque value to realize auxiliary braking of the vehicle, so that the anti-dragging torque value can be adaptively adjusted according to the weight of the vehicle, and braking energy is recovered based on the adjusted anti-dragging torque value to realize matching of the braking force of auxiliary braking and the actual braking requirement, thereby overcoming the defect of poor user experience caused by overlarge braking force.
Referring to fig. 6, fig. 6 is a schematic flow chart of a fourth embodiment of the auxiliary braking method for a vehicle according to the present invention, and the fourth embodiment of the auxiliary braking method for a vehicle according to the present invention is proposed based on the first embodiment shown in fig. 2.
In the fourth embodiment, after the step S10, the method further includes:
step S20': and when the state is an abnormal state, detecting whether the vehicle to be maintained is in a pre-starting state.
It is understood that when the state of the vacuum system is abnormal, which indicates that the vacuum booster is abnormally operated, the vacuum of the vacuum booster is insufficient, and at this time, if the vehicle to be maintained is allowed to perform a pre-start state, a danger may be caused. Therefore, it is necessary to detect whether the vehicle to be maintained is in a pre-start state when the state of the vacuum system is abnormal, and set a start prohibition flag to prohibit the vehicle to be maintained from entering the pre-start state when the vehicle to be maintained is not in the pre-start state.
It should be understood that detecting whether the vehicle to be maintained is in the pre-start state may be detecting whether a READY indicator of the vehicle to be maintained is turned on, and when the READY indicator is turned on, determining that the vehicle to be maintained is in the pre-start state; and when the READY indicator lamp is not lightened, determining that the vehicle to be maintained is not in a pre-starting state.
It should be noted that, after the new energy automobile is started, no rumbling sound of the engine exists, and it is difficult for an owner to judge whether the vehicle is started successfully. Therefore, the READY indicator light is required to inform the driver whether the vehicle is successfully started normally.
It can be understood that when the vehicle is started successfully, the READY indicator lamp is turned on; when the vehicle is not started successfully normally, the READY indicator lamp is not lighted.
Step S30': and when the vehicle to be maintained is not in the pre-starting state, setting a start prohibition identifier to prohibit the vehicle to be maintained from entering the pre-starting state.
It will be appreciated that when the state of the vacuum system is abnormal, a danger may arise if the vehicle is again allowed to enter the pre-start state. Therefore, when the vehicle to be maintained is not in the pre-starting state, the start prohibition identifier needs to be set to prohibit the vehicle to be maintained from entering the pre-starting state.
In the fourth embodiment, when the state of the vacuum system is abnormal, whether the vehicle to be maintained is in a pre-starting state is detected, and when the vehicle to be maintained is not in the pre-starting state, a start prohibition identifier is set to prohibit the vehicle to be maintained from entering the pre-starting state, so that whether the vacuum system is in the abnormal state is taken as a necessary condition for whether the vehicle can enter the pre-starting state, and the danger caused by starting of the vehicle when the vacuum is insufficient is avoided.
In the fourth embodiment, after the step S30', the method further includes:
step S40': and controlling an electronic vacuum pump of the vehicle to be maintained to start to operate so as to adjust the current vacuum degree.
It should be noted that the electronic vacuum pump can pump vacuum during operation, and reduce the current vacuum degree of the vacuum cylinder.
Step S50': and when the adjusted current vacuum degree is detected to be smaller than or equal to a preset removal threshold value, controlling the electronic vacuum pump to stop running, and removing the start prohibition identification so as to allow the vehicle to be maintained to enter a pre-start state.
It should be noted that the preset release threshold may be preset by a manager of the auxiliary brake device of the vehicle, for example, the manager of the auxiliary brake device of the vehicle may set-80 kPa as the preset release threshold.
It is understood that when the adjusted current vacuum degree is detected to be less than or equal to the preset release threshold, the state of the vacuum system is adjusted to the normal state. At this time, the start prohibition flag may be released to allow the vehicle to be serviced to enter the pre-start state.
The fourth embodiment controls the electronic vacuum pump of the vehicle to be maintained to start running so as to adjust the current vacuum degree, controls the electronic vacuum pump to stop running and removes the start prohibition identifier when detecting that the adjusted current vacuum degree is less than or equal to the preset removal threshold value so as to allow the vehicle to be maintained to enter the pre-start state, and thus can reduce the current vacuum degree by controlling the electronic vacuum pump to start running when the state of the vacuum system is abnormal, and further ensure that the vehicle to be maintained can enter the pre-start state.
Referring to fig. 7, fig. 7 is a schematic flow chart of a fifth embodiment of the auxiliary braking method for a vehicle according to the present invention, and the fifth embodiment of the auxiliary braking method for a vehicle according to the present invention is proposed based on the first embodiment shown in fig. 2.
In the fifth embodiment, after the step S10, the method further includes:
step S20 ″: and when the state is a normal state, detecting whether a braking instruction is received.
It should be understood that when the state of the vacuum system is a normal state, it indicates that the vacuum booster is not failed, auxiliary braking by braking energy recovery is not needed, and only energy recovery is needed. The energy recovery can be realized by applying reverse torque to the driving motor to convert the kinetic energy of the vehicle into electric energy, so that the endurance mileage of the vehicle is improved.
It should be noted that the braking command may be issued by a user through a brake pedal. For example, a user may depress a brake pedal to issue a braking command when braking is desired.
Step S30 ″: and when a braking instruction is received, acquiring the current vehicle speed, and recovering braking energy according to the current vehicle speed and the braking instruction.
It should be noted that the current vehicle speed may be the speed of the vehicle at the current time.
It is understood that the energy recovery according to the current vehicle speed and the brake command may be to extract a brake pedal switch signal and a brake pedal opening degree from the brake command, and perform the brake energy recovery according to the current vehicle speed, the brake pedal switch signal and the brake pedal opening degree.
In the fifth embodiment, when the state is the normal state, whether a braking instruction is received is detected, when the braking instruction is received, the current vehicle speed is acquired, and braking energy recovery is performed according to the current vehicle speed and the braking instruction, so that energy recovery can be performed normally when the state of the vacuum system is the normal state.
In addition, an embodiment of the present invention further provides a storage medium, where a vehicle auxiliary braking program is stored, and the vehicle auxiliary braking program, when executed by a processor, implements the vehicle auxiliary braking method as described above.
In addition, referring to fig. 8, an embodiment of the present invention further provides an auxiliary braking device for a vehicle, where the auxiliary braking device for a vehicle includes: a state determination module 10, a command detection module 20 and an auxiliary braking module 30;
the status determination module 10 is configured to determine a status of a vacuum system of a vehicle to be serviced.
It should be noted that the vehicle in the present invention may be a new energy vehicle, and the new energy vehicle is provided with a braking system. For ease of understanding, the description will be made with reference to fig. 3, but this scheme is not limited thereto. Fig. 3 is a schematic diagram of a braking system, which is composed of a vacuum booster, a brake pedal, a brake switch, an electronic vacuum pump, a vacuum cylinder, a vacuum pump controller, a vehicle control unit, a driving motor and a power battery device. Wherein, the vacuum booster is arranged on the brake pedal and used for increasing the force applied on the pedal by the driver so as to improve the braking effect; the brake switch is arranged on a brake pedal and connected with the vehicle control unit to transmit a signal whether the brake pedal touches the vehicle control unit or not; the vacuum cylinder is connected with the vacuum booster through a vacuum hose; the electronic vacuum pump is connected with the vacuum cylinder and used for vacuumizing the vacuum cylinder; the vacuum pump controller is arranged on the vacuum cylinder and can monitor the vacuum degree of the vacuum cylinder in real time; the vacuum pump controller converts the monitored vacuum degree into an electric signal and sends the electric signal to the vehicle control unit and the electronic vacuum pump; the vehicle control unit controls the driving motor to recover braking energy, and the electric energy recovered by the motor is stored in the power battery.
It is understood that the state of the vacuum system may be a failure state, an abnormal state, or a normal state. When the state of the vacuum system is a failure state, the failure of the vacuum booster is explained; when the state of the vacuum system is an abnormal state, the abnormal work of the vacuum booster is explained; when the state of the vacuum system is an abnormal state, the vacuum booster is proved to work normally.
It should be appreciated that determining the state of the vacuum system of the vehicle to be maintained may be by the vacuum pump controller directly monitoring the vacuum pump information of the electronic vacuum pump and determining the state of the vacuum system of the vehicle to be maintained from the vacuum pump information. Wherein the vacuum pump information is used to indicate the status of the vacuum pump.
The instruction detecting module 20 is configured to detect whether a braking instruction is received when the state is a failure state.
It should be noted that the braking command may be issued by a user through a brake pedal. For example, a user may depress a brake pedal to issue a braking command when braking is desired.
It should be understood that the detection of whether the braking instruction is received may be detection of whether a touch signal of the brake pedal uploaded by the brake switch is received, and when the touch signal of the brake pedal is received, it is determined that the braking instruction is received; and when the touch signal of the brake pedal is not received, judging that the brake command is not received.
The auxiliary braking module 30 is configured to recover braking energy when receiving a braking instruction, so as to implement auxiliary braking of the vehicle.
It should be understood that when the state of the vacuum system is a failure state, it indicates that the vacuum booster fails, and at this time, the force applied to the pedal by the driver cannot be increased by the vacuum booster, so that when the user needs braking, the force applied to the pedal is too small, and further, the braking force is too small, which is easy to cause danger. Therefore, the braking energy recovery is needed to perform auxiliary braking through the extra braking force generated by the braking energy recovery, so as to improve the braking efficiency and ensure the safety of the vehicle
It will be appreciated that on receipt of a braking command, the recovery of braking energy may be a preset anti-drag torque applied to the drive motor, together with the mechanical braking system, to slow the vehicle. Wherein the preset anti-drag torque can be preset.
According to the embodiment, the state of the vacuum system of the vehicle to be maintained is determined, whether a braking instruction is received or not is detected when the state is in the failure state, and the braking energy is recovered when the braking instruction is received, so that the braking force for recovering the braking energy can be additionally increased to perform auxiliary braking, the braking efficiency is improved, and the safety of the vehicle is ensured.
In an embodiment, the state determining module 10 is further configured to obtain a current vacuum degree of a vacuum cylinder of the vehicle to be maintained, and determine a state of a vacuum system of the vehicle to be maintained according to a corresponding relationship between the current vacuum degree and a preset vacuum degree interval and a state of the vacuum system;
in an embodiment, the auxiliary braking module 30 is further configured to acquire braking energy recovery system information, determine a maximum anti-drag torque value according to the braking energy recovery system information, and recover braking energy based on the maximum anti-drag torque value;
in an embodiment, the auxiliary braking module 30 is further configured to obtain a weight of the vehicle to be maintained, search a target anti-drag torque value corresponding to the weight from a preset torque table, and recover braking energy based on the target anti-drag torque value;
in one embodiment, the auxiliary braking device for a vehicle further includes: a normal braking module;
the normal braking module is used for detecting whether a braking instruction is received or not when the state is a normal state, acquiring the current vehicle speed when the braking instruction is received, and recovering braking energy according to the current vehicle speed and the braking instruction;
in one embodiment, the auxiliary braking device for a vehicle further includes: disabling the start-up module;
the start prohibiting module is used for detecting whether the vehicle to be maintained is in a pre-start state when the state is an abnormal state, and setting a start prohibiting identifier to prohibit the vehicle to be maintained from entering the pre-start state when the vehicle to be maintained is not in the pre-start state;
in an embodiment, the start prohibition module is further configured to control an electronic vacuum pump of the vehicle to be maintained to start operating to adjust the current vacuum degree, and when it is detected that the adjusted current vacuum degree is less than or equal to a preset cancellation threshold value, control the electronic vacuum pump to stop operating, and cancel the start prohibition identifier, so as to allow the vehicle to be maintained to enter a preset start state.
Other embodiments or specific implementation manners of the auxiliary braking device for the automobile can refer to the above method embodiments, and details are not repeated herein.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, third, etc. are to be interpreted as names.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention or portions thereof that contribute to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a Read Only Memory (ROM)/Random Access Memory (RAM), a magnetic disk, an optical disk), and includes several instructions for enabling a terminal device (e.g., a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An auxiliary braking method for a vehicle, the method comprising:
determining a state of a vacuum system of a vehicle to be maintained;
when the state is a failure state, detecting whether a braking instruction is received;
and when a braking instruction is received, the braking energy is recovered to realize the auxiliary braking of the automobile.
2. The method of claim 1, wherein determining the status of the vacuum system of the vehicle to be serviced comprises:
acquiring the current vacuum degree of a vacuum cylinder of a vehicle to be maintained;
and determining the state of the vacuum system of the vehicle to be maintained according to the corresponding relation between the current vacuum degree and the preset vacuum degree interval and the state of the vacuum system.
3. The auxiliary braking method for a vehicle according to claim 1, wherein the performing braking energy recovery comprises:
acquiring braking energy recovery system information, and determining a maximum anti-drag torque value according to the braking energy recovery system information;
and recovering the braking energy based on the maximum anti-dragging torque value.
4. The auxiliary braking method for a vehicle according to claim 1, wherein the performing braking energy recovery comprises:
acquiring the weight of a vehicle to be maintained, and searching a target anti-dragging torque value corresponding to the weight from a preset torque table;
and recovering the braking energy based on the target anti-dragging torque value.
5. The vehicle auxiliary braking method according to any one of claims 1 to 4, wherein after determining the state of the vacuum system of the vehicle to be serviced, the method further comprises:
when the state is a normal state, detecting whether a braking instruction is received;
and when a braking instruction is received, acquiring the current vehicle speed, and recovering braking energy according to the current vehicle speed and the braking instruction.
6. The vehicle auxiliary braking method according to any one of claims 1 to 4, wherein after determining the state of the vacuum system of the vehicle to be serviced, the method further comprises:
when the state is an abnormal state, detecting whether the vehicle to be maintained is in a pre-starting state;
and when the vehicle to be maintained is not in the pre-starting state, setting a start prohibition identifier to prohibit the vehicle to be maintained from entering the pre-starting state.
7. The vehicle auxiliary braking method according to claim 6, wherein after the start prohibition flag is set, the method further comprises:
controlling an electronic vacuum pump of the vehicle to be maintained to start to operate so as to adjust the current vacuum degree;
and when the adjusted current vacuum degree is detected to be smaller than or equal to a preset removal threshold value, controlling the electronic vacuum pump to stop running, and removing the start prohibition identification so as to allow the vehicle to be maintained to enter a pre-start state.
8. An auxiliary brake apparatus for a vehicle, characterized by comprising: memory, processor and vehicle auxiliary brake program stored on the memory and executable on the processor, which when executed by the processor implements a vehicle auxiliary brake method according to any one of claims 1 to 7.
9. A storage medium, characterized in that the storage medium has stored thereon a vehicle auxiliary braking program which, when executed by a processor, implements a vehicle auxiliary braking method according to any one of claims 1 to 7.
10. An auxiliary brake apparatus for a vehicle, comprising: the brake system comprises a state determining module, an instruction detecting module and an auxiliary braking module;
the state determination module is used for determining the state of a vacuum system of the vehicle to be maintained;
the command detection module is used for detecting whether a braking command is received or not when the state is a failure state;
and the auxiliary braking module is used for recovering braking energy when receiving a braking instruction so as to realize auxiliary braking of the automobile.
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| CN113335256B (en) | 2022-04-22 |
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