CN116262493A - Electronic parking system and vehicle - Google Patents
Electronic parking system and vehicle Download PDFInfo
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- CN116262493A CN116262493A CN202111536634.5A CN202111536634A CN116262493A CN 116262493 A CN116262493 A CN 116262493A CN 202111536634 A CN202111536634 A CN 202111536634A CN 116262493 A CN116262493 A CN 116262493A
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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
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/68—Electrical control in fluid-pressure brake systems by electrically-controlled valves
- B60T13/683—Electrical control in fluid-pressure brake systems by electrically-controlled valves in pneumatic systems or parts thereof
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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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- Braking Systems And Boosters (AREA)
Abstract
The invention provides an electronic parking system and a vehicle, and belongs to the technical field of vehicle brake control. The device comprises a controller, a parking air bag, a first electromagnetic valve, a relay valve and a parking spring air chamber, wherein the parking air bag is directly connected with an input port of the relay valve, and is also connected with a control port of the relay valve through the first electromagnetic valve; the proportional valve is connected with a pipeline of the control port of the relay valve through a pipeline, and the output port of the proportional valve is communicated with the atmosphere. By adopting the method for conducting the proportional valve according to a certain proportion, the vehicle cannot directly reach great deceleration when the electronic parking system activates the electronic parking, so that a driver and a passenger on the vehicle can maintain a relatively stable posture, and danger is avoided.
Description
Technical Field
The invention provides an electronic parking system and a vehicle, belongs to the technical field of vehicle brake control, and particularly relates to a linear control electronic parking system.
Background
With the vigorous development of automatic driving technology, besides the core technology of automatic driving such as perception, decision making, system integration and the like, the executing parts such as steering, braking and the like are also subject to the requirements of automatic driving, and have higher requirements in the aspects of functions, performance, reliability and the like. At present, the brake-by-wire technology of the automatic driving buses is mature and is successfully applied to various large bus product lines, but for the automatic driving buses, a single service brake system cannot meet the safety and redundancy requirements of the whole bus brake, and once the service brake system fails, the automatic driving buses lose control, and unavoidable losses can be caused.
In the prior art, in order to increase the redundant function of the safety brake of a vehicle, when a driving brake system fails, the electronic parking system is directly activated to cause the vehicle to have larger braking deceleration, so that the posture of a driver or a passenger on the vehicle is unstable easily, and the safety accident is caused.
Disclosure of Invention
The invention aims to provide an electronic parking system and a vehicle, which are used for solving the problem that when a service brake system of the vehicle fails, the electronic parking system is directly activated to cause danger to passengers or drivers.
In order to achieve the above purpose, the invention provides an electronic parking system, which comprises a controller, a parking air bag, a first electromagnetic valve, a relay valve and a parking spring air chamber, wherein the parking air bag is directly connected with an input port of the relay valve and is also connected with a control port of the relay valve through the first electromagnetic valve; the controller is in control connection with the first electromagnetic valve; the output port of the relay valve is communicated with the parking spring air chamber through a pipeline, the exhaust port of the relay valve is communicated with the atmosphere, if the control port of the relay valve is in a pressurized state, the input port of the relay valve is communicated with the output port of the relay valve, and if the control port of the relay valve is in an under-pressure state, the output port of the relay valve is communicated with the exhaust port of the relay valve; the control device is characterized by further comprising a proportional valve, wherein an input port of the proportional valve is connected with a pipeline connected with a control port of the relay valve, an output port of the proportional valve is communicated with the atmosphere, and the controller is controlled to be connected with the proportional valve, so that the proportional valve is controlled to be disconnected or connected according to a certain proportion.
The original electronic parking system comprises a controller, a parking air bag, a first electromagnetic valve, a relay valve and a parking spring air chamber, wherein the parking air bag is directly connected with an input port of the relay valve, and is also connected with a control port of the relay valve through the first electromagnetic valve; the proportional valve is connected with a pipeline of the control port of the relay valve through a pipeline, and the output port of the proportional valve is communicated with the atmosphere. The controller controls the first electromagnetic valve and the proportional valve to be connected or disconnected, when the first electromagnetic valve is connected, the parking air bag increases pressure to the control port of the relay valve, so that a pressure state is achieved, the input port of the relay valve is communicated with the output port of the relay valve, the parking air bag pressurizes the parking spring air chamber, and the electronic parking is released; when the first electromagnetic valve is disconnected, the controller controls the proportional valve to be conducted according to a certain proportion, the pressure at the control port of the relay valve is released to the atmosphere, the under-pressure state is achieved, the output port of the relay valve is communicated with the exhaust port of the relay valve, the pressure of the parking spring air chamber is released to the atmosphere, and the electronic parking is activated. By adopting the method for conducting the proportional valve according to a certain proportion, the vehicle cannot directly reach great deceleration when the electronic parking system activates the electronic parking, so that a driver and a passenger on the vehicle can maintain a relatively stable posture, and danger is avoided.
Further, in the above system, when the driving brake system fails, the driving brake is performed by the electronic parking system, and the controller obtains the proportional valve initial opening corresponding to the target deceleration from the correspondence between the target deceleration and the proportional valve initial opening obtained in advance based on the obtained target deceleration, and controls the proportional valve to be turned on based on the proportional valve initial opening.
When the electronic parking system is used for carrying out service braking, the controller obtains the initial opening of the proportional valve corresponding to the target deceleration from the relation between the target deceleration which is obtained in advance and the initial opening of the proportional valve according to the target deceleration, and controls the conduction of the proportional valve according to the initial opening of the proportional valve, so that a relatively reliable initial opening can be provided when the proportional valve is conducted, and the reliability of the service braking by adopting the electronic parking system is improved.
Further, in the system, the controller obtains the target deceleration corresponding to the current vehicle speed from the corresponding relation between the pre-obtained vehicle speed and the target deceleration according to the obtained current vehicle speed of the whole vehicle.
The target deceleration required by the braking of the vehicle is obtained through the current speed of the whole vehicle and the corresponding relation between the pre-acquired speed and the target deceleration, relatively good deceleration can be provided according to the speed of the vehicle, the reliability of the electronic parking system for carrying out the service braking is improved, and the riding experience of passengers is improved.
Further, in the above system, during the process of performing the service braking by the electronic parking system, the real-time deceleration of the vehicle is detected, if the real-time deceleration of the vehicle is smaller than the target deceleration, the opening degree of the proportional valve is decreased, and if the real-time deceleration of the vehicle is larger than the target deceleration, the opening degree of the proportional valve is increased.
In the process of carrying out service braking through the electronic parking system, a control mode of feedback regulation is adopted, real-time deceleration is taken as a control target, if the real-time deceleration of the vehicle is smaller than the target deceleration, the opening of the proportional valve is reduced, and if the real-time deceleration of the vehicle is larger than the target deceleration, the opening of the proportional valve is increased. By adopting a feedback adjustment mode, the smoothness degree of vehicle braking can be ensured, and the reliability of service braking by adopting an electronic parking system is improved.
Further, in the system, the system further comprises a second electromagnetic valve, an input port of the second electromagnetic valve is communicated with a pipeline of the relay valve, an output port of the second electromagnetic valve is connected with the parking spring air chamber, an output port of the second electromagnetic valve is communicated with the atmosphere, and the controller is connected with the second electromagnetic valve in a control mode.
The electronic parking system further comprises a second electromagnetic valve, and electronic parking activation is achieved by controlling the second electromagnetic valve to be conducted, so that air pressure at a control port of the relay valve is discharged to the atmosphere at the maximum flow, the parking efficiency of electronic parking is improved, and the situation that vehicles have large brake displacement and vehicle safety is affected is avoided.
Further, in the system, in the process of parking braking through the electronic parking system, the second electromagnetic valve is controlled to be conducted, the air pressure at the control port of the relay valve is detected in real time, and when the air pressure at the control port of the relay valve reaches the set air pressure, the second electromagnetic valve is controlled to be disconnected.
When the air pressure at the control port of the relay valve is reduced to the set air pressure, the second electromagnetic valve is disconnected, so that the air pressure at the control port of the relay valve is kept, and when the electronic parking is released, the control port of the relay valve can be rapidly in a pressurized state, and the efficiency of the electronic parking release is improved.
Further, in the system, the system further comprises an emergency valve, wherein the emergency valve is connected in series on a pipeline of the first electromagnetic valve connected with the control port of the relay valve, and the exhaust port of the emergency valve is communicated with the atmosphere.
The electronic parking system is further communicated with the atmosphere through an emergency valve, when the driving brake system and the electronic parking system are in failure, the emergency valve is manually operated, the air pressure at the control port of the relay valve is reduced, the output port of the relay valve is communicated with the exhaust port of the relay valve, the parking spring air chamber is depressurized to the atmosphere, parking under emergency is completed, and the safety of the vehicle is improved.
Further, in the system, the control device further comprises a one-way valve arranged on a pipeline of the first electromagnetic valve connected with the control port of the relay valve, wherein an input port of the one-way valve is communicated with an output port of the first electromagnetic valve, and an output port of the one-way valve is communicated with the emergency valve.
The process of establishing pressure to the control port of the relay valve is buffered through the one-way valve, so that the relay valve is prevented from being greatly damaged, and the safety of the electronic parking system is improved.
Further, in the above system, the relay valve further comprises a first air pressure sensor for detecting air pressure at the control port of the relay valve, and the first air pressure sensor is arranged on a pipeline at one side of the output port of the one-way valve.
The air pressure at the control port of the relay valve can be detected through the first air pressure sensor, and when the second electromagnetic valve or the proportional valve is opened, the first air pressure sensor detects that the air pressure at the control port of the relay valve is overlarge, so that the fault of the second electromagnetic valve or the proportional valve can be judged, and the electronic parking system can be timely maintained.
Further, in the system, the system further comprises a second air pressure sensor for detecting air pressure in the parking spring air chamber, and the second air pressure sensor is arranged on a pipeline of the relay valve output port communicated with the parking spring air chamber.
The air pressure in the parking spring air chamber is detected through the second air pressure sensor, and when the output port of the relay valve is communicated with the exhaust port of the relay valve, if the air pressure in the parking spring air chamber is detected to be too high, the fault of the relay valve is judged, so that the electronic parking system is maintained in time, and the safety of the electronic parking system is improved.
Further, in the above system, a flow sensor for detecting the exhaust flow rate of the exhaust port of the proportional valve is further included, and the flow sensor is provided on a line through which the output port of the proportional valve communicates with the atmosphere.
The proportional valve is subjected to fault judgment through the flow sensor so as to improve the safety of the electronic parking system, and if the opening of the proportional valve is larger and the flow at the exhaust port of the proportional valve is lower, the proportional valve is in fault.
Further, in the above system, an alarm device connected to the controller is further included for prompting the driver or passenger of the vehicle state during the parking braking process.
The vehicle state, such as the vehicle speed, in the parking process or the braking process is prompted to a driver or a passenger through the alarm device, so that safety accidents are avoided.
Further, in the above system, the alarm device includes a voice alarm, an audible and visual alarm, and/or an AR display.
The alarm device adopts the modes of voice characters, audible and visual alarm and AR display to prompt a driver or a passenger, so that the observation is convenient.
The invention further provides a vehicle, and the electronic parking system is adopted.
Drawings
FIG. 1 is a block diagram of an electronic parking system in an embodiment of the present invention;
in the figure, 1 is an electronic parking air bag, 2 is a first electromagnetic valve, 21 is a first electromagnetic valve input port, 22 is a first electromagnetic valve output port, 3 is a one-way valve, 31 is a one-way valve input port, 32 is a one-way valve output port, 4 is an electronic parking switch, 5 is a proportional valve, 51 is a proportional valve input port, 52 is a proportional valve output port, 6 is a relay valve, 61 is a relay valve input port, 62 is a relay valve output port, 63 is a relay valve exhaust port, 64 is a relay valve control port, 7 is a second electromagnetic valve, 71 is a second electromagnetic valve input port, 72 is a second electromagnetic valve output port, 8 is an emergency valve, 81 is an emergency valve input port, 82 is an emergency valve output port, 83 is an emergency valve exhaust port, 9 is a first air pressure sensor, 10 is a second air pressure sensor, 11 and 12 are parking spring air chambers, and 13 is a flow sensor;
fig. 2 is a schematic diagram of a system state of an electronic parking system in an embodiment of the present invention when parking is activated in a manual driving state;
fig. 3 is a schematic diagram of a system state of an electronic parking system in an embodiment of the present invention when parking is released in a manual driving state;
FIG. 4 is a logic function flow diagram of an electronic parking system in an embodiment of the present invention;
fig. 5 is a schematic diagram of a system state of an electronic parking system in an embodiment of the present invention when parking is activated in an automatic driving state;
FIG. 6 is a graphical representation of the correspondence between vehicle speed and braking deceleration in an embodiment of the system of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent.
System embodiment:
the electronic parking system of the present invention, as shown in fig. 1, includes an automatic driving controller, an electronic parking air bag 1, a first solenoid valve 2, a check valve 3, a relay valve 6, a parking spring air chamber 11, and a parking spring air chamber 12. The electronic parking air bag 1 is respectively communicated with the first electromagnetic valve input port 21 and the relay valve input port 61 through pipelines, the first electromagnetic valve output port 22 is communicated with the one-way valve input port 31, the one-way valve output port 32 is connected with the relay valve control port 64 through a pipeline, the relay valve output port 62 is communicated with the parking spring air chamber 11 and the parking spring air chamber 12 through pipelines, and the relay valve exhaust port 63 is communicated with the atmosphere. The automatic driving controller is connected with the first electromagnetic valve 2 to switch the first electromagnetic valve 2 on or off, when the first electromagnetic valve 2 is on, the first electromagnetic valve input port 21 is communicated with the first electromagnetic valve output port 22, and when the first electromagnetic valve 2 is off, the first electromagnetic valve input port 21 is not communicated with the first electromagnetic valve output port 22. In this embodiment, the relay valve 6 is a differential relay valve.
The electronic parking system further comprises a second electromagnetic valve 7, wherein the second electromagnetic valve input port 71 is communicated with the one-way valve output port 32, the second electromagnetic valve output port 72 is communicated with the atmosphere, the automatic driving controller is connected with the second electromagnetic valve 7 to switch the second electromagnetic valve 7 on or off, when the second electromagnetic valve 7 is on, the second electromagnetic valve input port 71 is communicated with the second electromagnetic valve output port 72, and when the second electromagnetic valve 7 is off, the second electromagnetic valve input port 71 is not communicated with the second electromagnetic valve output port 72.
The electronic parking system further comprises a proportional valve 5, wherein the proportional valve input port 51 is communicated with the one-way valve output port 32, the proportional valve output port 52 is communicated with the atmosphere, the automatic driving controller is connected with the proportional valve 5 to switch the proportional valve 5 on or off, when the proportional valve 5 is on, the proportional valve input port 51 is communicated with the proportional valve output port 52, and when the proportional valve 5 is off, the proportional valve input port 51 is not communicated with the proportional valve output port 5.
The electronic parking system further comprises an electronic parking switch 4, a first air pressure sensor 9, a second air pressure sensor 10 and a flow sensor 13. The electronic parking switch 4 is connected with an automatic driving controller to realize parking activation and release in a manual driving mode. The first air pressure sensor 9 is arranged on a pipeline connecting the one-way valve output port 32 and the emergency valve input port 81, the second air pressure sensor 10 is arranged on a pipeline connecting the relay valve output port 62 with the parking spring air chamber, and the flow sensor 13 is arranged on a pipeline connecting the proportional valve output port 52 with the atmosphere.
The electronic parking system can realize parking activation and parking release in a manual driving mode, and can also realize parking activation and parking release functions in an automatic driving mode and a redundant braking function in the automatic driving mode.
In the manual driving mode, if the vehicle is in the electronic parking release state, at this time, the electronic parking switch 4 is not enabled, the first electromagnetic valve 2 and the second electromagnetic valve 7 are in the off state, the proportional valve 5 is in the off state, the relay valve control port 64 is in the pressurized state, the relay valve input port 61 and the relay valve output port 62 are turned on, and the electronic parking air bag 1 maintains the parking spring air chambers (11, 12) in the pressurized state.
Therefore, as shown in fig. 2, the process of implementing automatic parking activation by the electronic parking system in the manual driving mode is that the driver operates the electronic parking switch 4, so that the electronic switch 4 is enabled, the automatic driving controller sends a driving instruction to the second electromagnetic valve 7 to conduct the second electromagnetic valve 7 under the condition that the working states of the sensors are not abnormal, the second electromagnetic valve input port 71 is communicated with the atmosphere through the second electromagnetic valve output port 72, the pressure at the relay valve control port 64 is discharged from the second electromagnetic valve output port 72, the relay valve output port 62 and the relay valve exhaust port 63 are conducted under the influence of the pressure, the air pressure in the parking spring air chamber is discharged from the relay valve exhaust port 63, and the parking spring is stretched, so that automatic parking activation is implemented.
In the automatic parking activation process, the automatic driving controller collects the air pressure in the parking spring air chamber through the second air pressure sensor 10, and if the air pressure in the parking spring air chamber is smaller than the set parking air pressure, the automatic driving controller controls the second electromagnetic valve 7 to be disconnected, so that the parking activation state of the vehicle is maintained.
In the manual driving mode, if the initial state of the vehicle is the electronic parking activated state, at this time, the electronic parking switch 4 is enabled, the first electromagnetic valve 2 and the second electromagnetic valve 7 are in the off state, the proportional valve 5 is in the off state, the relay valve control port 64 is in the under-voltage state, the relay valve output port 62 and the relay valve exhaust port 63 are on, and the parking spring air chambers (11, 12) are in the under-voltage state.
Therefore, as shown in fig. 3, the electronic parking switch 4 cancels the enabling of the electronic parking system in the manual driving mode, and the automatic driving controller sends a driving instruction to the first electromagnetic valve 2 to conduct the first electromagnetic valve input port 21 and the second electromagnetic valve output port 22 under the condition that the working states of the sensors are not abnormal, so that the air pressure of the electronic parking air bag 1 is transmitted to the relay valve control port 64 through the check valve and is influenced by the relay valve input port 61 and the relay valve output port 62, the electronic parking air bag 1 continuously pressurizes the parking spring air chambers (11 and 12), the parking spring air chambers reach the pressure state, and the parking spring is compressed, so that the automatic parking is released.
In the automatic parking release process, the automatic driving controller collects the air pressure in the parking spring air chamber through the second air pressure sensor 10, and if the air pressure in the parking spring air chamber is greater than the set parking air pressure, the automatic driving controller controls the first electromagnetic valve 2 to be disconnected, so that the vehicle parking release state is maintained. The automatic driving controller also acquires the pressure at the side of the second electromagnetic valve input port 71 through the first air pressure sensor 9, and if the pressure at the side of the second electromagnetic valve input port 71 is higher than a certain pressure value, the second electromagnetic valve 7 is considered to be failed, and the automatic parking system is considered to be failed.
In the automatic driving mode, the implementation mode of the vehicle for realizing automatic parking activation and automatic parking release is consistent with the implementation mode of the vehicle for realizing automatic parking activation and automatic parking release in the manual driving mode, and the difference is that: in the manual driving mode, a driver operates the electronic parking switch to send a parking activation instruction and a parking release instruction to the automatic driving controller, and in the automatic driving mode, the automatic driving controller performs automatic driving control to realize automatic parking activation and automatic parking release.
In the electronic parking process, the air pressure at the control port 64 of the relay valve is obtained through the first air pressure sensor 9, when the air pressure at the control port of the relay valve is reduced to the set air pressure, the second electromagnetic valve 7 is disconnected, so that the air pressure at the control port 64 of the relay valve is kept, and when the electronic parking is released, the pressure state can be quickly reached at the control port of the relay valve, and the efficiency of the electronic parking release is improved.
In addition, the electronic parking system further comprises an emergency valve 8, wherein the emergency valve 8 is arranged on a pipeline with the one-way valve output port 32 connected with the relay valve control port 64, the emergency valve input port 81 is communicated with the one-way valve output port 32, the emergency valve output port 82 is communicated with the relay valve control port 64, and the emergency valve exhaust port 83 is communicated with the atmosphere.
In the emergency situation that the vehicle cannot park, such as valve faults and sensor faults, the emergency valve 8 of the vehicle can be directly opened, the pressure at the control port 64 of the relay valve is discharged from the emergency valve exhaust port 83, the control port is affected by the emergency valve, the output port 62 of the relay valve is communicated with the exhaust port 63 of the relay valve, and the pressure in the air chamber of the parking spring is discharged from the exhaust port 63 of the relay valve, so that emergency parking is realized.
During the control process of automatic parking activation and automatic parking release, the emergency valve input port 81 and the emergency valve output port 82 are normally open, thereby ensuring normal implementation of the functions of automatic parking activation and automatic parking release.
In the automatic driving mode, the electronic parking system further realizes a wire control redundant braking function before parking through a control flow shown in fig. 4, and performs fuzzy control on the release speed of the air pressure in the parking spring air chamber through linearly adjusting the opening of the proportional valve, so as to obtain different braking decelerations. The method comprises the following specific steps:
1) The autopilot controller generates braking demands according to autopilot programs, and the autopilot controller issues braking requests to EBS (Electrical Brake System) according to the braking demands and determines whether the EBS fails.
2) If the EBS system is normal, the EBS responds to a braking request issued by the automatic driving controller, braking is performed according to braking deceleration issued by the automatic controller, and after braking and stopping, the automatic driving controller activates automatic parking; if the EBS system is abnormal, the automatic driving controller obtains the current vehicle speed, obtains the braking deceleration corresponding to the current vehicle speed according to the corresponding relation between the preset vehicle speed and the braking deceleration, and carries out the next step to realize redundant braking.
3) The automatic driving controller extracts a proportional valve initial opening corresponding to the braking deceleration from a relationship between the braking deceleration, which is calibrated in advance, and the proportional valve initial opening, based on the braking deceleration. Then, as shown in fig. 5, the automatic driving controller controls the proportional valve 5 to be conducted according to a certain proportion according to the initial opening of the proportional valve, the pressure at the control port 64 of the relay valve is discharged through the input port 51 of the proportional valve and the output port 52 of the proportional valve, the output port 62 of the relay valve is conducted with the exhaust port 63 of the relay valve under the influence of the pressure, and the air pressure in the air chamber of the parking spring is discharged from the exhaust port 63 of the relay valve, thereby realizing redundant braking.
In this embodiment, considering the situation of applying the present invention on a bus, the correspondence between the vehicle speed and the braking deceleration is shown in fig. 6, the highest design vehicle speed is 69km/h, and the excessive braking deceleration is not suitable to be issued in any vehicle speed state due to the safety of passengers (partial passengers have no seats), and the braking deceleration required to be issued cannot exceed-2.5 m/s 2 But the speed is too low<6 km/h), the issued braking deceleration cannot be less than-1 m/s either 2 In order not to lead to longer braking times and distances.
According to the corresponding relation shown in fig. 6, under the condition that the vehicle speed is high, the obtained braking deceleration is relatively large, then according to the corresponding relation between the braking deceleration and the initial opening of the proportional valve, the initial opening of the proportional valve is obtained, the proportional valve is opened according to the large initial opening by the automatic driving control, the air pressure at the control port 64 of the relay valve is quickly released, the air pressure in the air chamber of the parking spring is also quickly released, the vehicle can obtain the large braking deceleration, and the vehicle speed is quickly reduced and finally parked; under the condition of lower vehicle speed, the automatic driving controller linearly adjusts the proportional valve to be opened according to the smaller initial opening, so that the vehicle can be ensured to acquire smaller braking deceleration, and the vehicle can be stably stopped.
In the process of controlling the proportional valve 7, the automatic driving controller acquires the exhaust flow rate of the proportional valve output port 52 from the flow sensor 13, and if the automatic driving controller adjusts the proportional valve to be at a larger opening degree and the exhaust flow rate of the proportional valve output port 52 is smaller, the proportional valve 7 is considered to have a fault.
4) After the vehicle is braked and stopped according to the braking deceleration, the automatic parking is activated by the automatic parking activation process.
The electronic parking system also has an alarm function, and the automatic driving controller is connected with the voice host and the audible and visual alarm and is also connected with the AR display screen through the AR host. After the automatic driving controller recognizes faults of the electromagnetic valve, the sensor and the like, fault information is forwarded to equipment such as an instrument, a central control screen, an AR display screen and the like through a gateway, and the fault of the electronic parking system is prompted to be repaired. In the process of redundant braking of the vehicle, the automatic driving controller reminds passengers of emergency parking through voice, audible and visual alarm, AR display and other modes, and safety is noted.
Vehicle embodiment:
the structure and application of the electronic parking system in the system embodiment provided by the invention are clearly understood in the description of the system embodiment, and are not repeated here.
Claims (14)
1. An electronic parking system comprises a controller, a parking air bag, a first electromagnetic valve, a relay valve and a parking spring air chamber, wherein the parking air bag is directly connected with an input port of the relay valve and is also connected with a control port of the relay valve through the first electromagnetic valve; the controller is in control connection with the first electromagnetic valve; the output port of the relay valve is communicated with the parking spring air chamber through a pipeline, the exhaust port of the relay valve is communicated with the atmosphere, if the control port of the relay valve is in a pressurized state, the input port of the relay valve is communicated with the output port of the relay valve, and if the control port of the relay valve is in an under-pressure state, the output port of the relay valve is communicated with the exhaust port of the relay valve; the intelligent control device is characterized by further comprising a proportional valve, wherein an input port of the proportional valve is connected with a pipeline connected with a control port of the relay valve, an output port of the proportional valve is communicated with the atmosphere, and a controller is controlled to be connected with the proportional valve, so that the proportional valve is controlled to be disconnected or connected according to a certain proportion.
2. The electronic parking system according to claim 1, wherein when the traveling brake system fails, the traveling brake is applied by the electronic parking system, and the controller obtains a proportional valve initial opening corresponding to the target deceleration from a correspondence between the target deceleration obtained in advance and the proportional valve initial opening, based on the obtained target deceleration, and controls the proportional valve to be turned on based on the proportional valve initial opening.
3. The electronic parking system according to claim 2, wherein the controller obtains the target deceleration corresponding to the current vehicle speed from a correspondence between a previously obtained vehicle speed and the target deceleration, based on the obtained current vehicle speed of the entire vehicle.
4. The electronic parking system according to claim 2, wherein the real-time deceleration of the vehicle is detected during the service braking by the electronic parking system, the proportional valve opening is decreased if the real-time deceleration of the vehicle is smaller than the target deceleration, and the proportional valve opening is increased if the real-time deceleration of the vehicle is larger than the target deceleration.
5. The electronic parking system of claim 1, further comprising a second solenoid valve, wherein an input port of the second solenoid valve is in communication with a conduit connecting the relay valve output port to the parking spring plenum, wherein the second solenoid valve output port is in communication with the atmosphere, and wherein the controller is in control connection with the second solenoid valve.
6. The electronic parking system according to claim 5, wherein the second electromagnetic valve is controlled to be turned on during a parking braking process by the electronic parking system, the air pressure at the control port of the relay valve is detected in real time, and the second electromagnetic valve is controlled to be turned off when the air pressure at the control port of the relay valve reaches a set air pressure.
7. The electronic parking system of claim 1, further comprising an emergency valve coupled in series with the first solenoid valve on a line connecting the relay valve control port, the emergency valve exhaust port being in communication with the atmosphere.
8. The electronic parking system of claim 7, further comprising a one-way valve disposed on a line connecting the first solenoid valve to the control port of the relay valve, the one-way valve input port being in communication with the first solenoid valve output port, the one-way valve output port being in communication with the emergency valve.
9. The electronic parking system of claim 8, further comprising a first air pressure sensor for detecting air pressure at the control port of the relay valve, the first air pressure sensor being disposed on the line on the side of the output port of the check valve.
10. The electronic parking system of claim 1, further comprising a second air pressure sensor for detecting air pressure within the parking spring air chamber, the second air pressure sensor being disposed on a line through which the relay valve output communicates with the parking spring air chamber.
11. The electronic parking system of claim 1, further comprising a flow sensor for detecting an exhaust flow rate of the proportional valve exhaust port, the flow sensor being disposed on a line through which the proportional valve output port communicates with the atmosphere.
12. An electronic parking system as claimed in claim 1, further comprising an alarm device connected to the controller for alerting a driver or passenger of the vehicle condition during the parking brake.
13. Electronic parking system according to claim 12, characterized in that the alarm means comprise a voice alarm, an audible and visual alarm and/or an AR display.
14. A vehicle characterized in that an electronic parking system as claimed in any one of claims 1-13 is employed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111536634.5A CN116262493A (en) | 2021-12-15 | 2021-12-15 | Electronic parking system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111536634.5A CN116262493A (en) | 2021-12-15 | 2021-12-15 | Electronic parking system and vehicle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116262493A true CN116262493A (en) | 2023-06-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111536634.5A Pending CN116262493A (en) | 2021-12-15 | 2021-12-15 | Electronic parking system and vehicle |
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| CN (1) | CN116262493A (en) |
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