CN111746483A - Parking brake backup unit, vehicle and parking brake method - Google Patents
Parking brake backup unit, vehicle and parking brake method Download PDFInfo
- Publication number
- CN111746483A CN111746483A CN201910237072.0A CN201910237072A CN111746483A CN 111746483 A CN111746483 A CN 111746483A CN 201910237072 A CN201910237072 A CN 201910237072A CN 111746483 A CN111746483 A CN 111746483A
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- 238000000034 method Methods 0.000 title claims abstract description 14
- 230000000087 stabilizing effect Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000001133 acceleration Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000011897 real-time detection Methods 0.000 description 1
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Classifications
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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
- B60T7/00—Brake-action initiating means
- B60T7/12—Brake-action initiating means for automatic initiation; for initiation not subject to will of driver or passenger
-
- 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
Abstract
The invention provides a parking brake standby unit, a vehicle and a parking brake method. The parking brake backup unit is connected to a controller (5) of a body electronic stability system of a vehicle, a brake caliper drive of the vehicle and a power module (4) of the vehicle, wherein the parking brake backup unit is designed to control the brake caliper drive in order to achieve a locking of the vehicle in the event of a failure of a system control module (3) of the body electronic stability system and/or a parking gear of the vehicle.
Description
Technical Field
The invention relates to the field of braking, in particular to the field of redundant parking braking systems, and particularly relates to a parking braking standby unit, a vehicle and a parking braking method.
Background
In the prior art, a redundant control logic is added to an electronic Stability system esp (electronic Stability program) with an APB-Mi (Automatic park Brake-integrated Motor gearbox, also referred to as electronic caliper) product to achieve redundant Parking Brake performance without the need to install a Parking pawl lock (p (paw) lock in the electric vehicle.
The national standard GB21670 states that a passenger car equipped with an electronic parking control system can remain parked on an 8% slope (uphill, downhill) when the controller fails, in the case of full load. To achieve this, the vehicle is equipped with a P-lock mechanism that locks the transmission so that the vehicle remains stopped when the vehicle enters P range.
Since electric vehicles do not have a transmission and APB-Mi is mass produced, it is a future trend to eliminate P-lock in view of cost, installation space, and new features of the vehicle driveline.
In current parking systems, parking is performed by using APB-Mi with a P-lock. If the P-lock is removed, then in the event of a failure of the APB-Mi Electrical Control Unit (ECU), no equipment can be used to bring the vehicle to a standstill and also not meet the standard requirements described above. Therefore, a new design is needed to avoid this risk.
CN108639038A relates to a two MCU control system who is applied to car electron parking braking, its characterized in that: the system comprises two microcontrollers, a control exchange circuit, an H-Bridge driving circuit, a parking switch circuit and a double-shaft acceleration sensor; the two microcontrollers are core modules of the electronic parking brake control system, and the two microcontrollers execute a control exchange circuit to realize the control of the parking motor by detecting signals of a parking switch circuit and a double-shaft acceleration sensor.
Disclosure of Invention
According to various aspects, the present invention aims to adapt the design of the APB-Mi ECU, add a backup control circuit and power path to ensure that in case of a first control logic or circuit or power failure, there is a backup means to control the motor on the caliper even without P-lock if necessary for bringing the vehicle to a standstill; if one APB-Mi control logic and one drive both fail, the new APB-Mi according to the invention can still bring the vehicle to a standstill and still meet the requirements of the standard GB 21670.
Furthermore, the present invention is also directed to solve or alleviate other technical problems of the prior art.
The present invention solves the above problems by providing a parking brake standby unit, a vehicle, and a parking brake method, and specifically, according to an aspect of the present invention, there is provided:
parking brake backup unit, wherein the parking brake backup unit is connected with a controller of a body electronic stability system of a vehicle, a brake caliper driver of the vehicle and a power module of the vehicle, respectively, wherein the parking brake backup unit is configured for controlling the brake caliper driver in case of a failure of a system control module of the body electronic stability system and/or a parking gear of the vehicle in order to achieve a locking of the vehicle.
According to another aspect of the invention, a vehicle is provided, wherein the vehicle has the parking brake standby unit.
According to still another aspect of the present invention, there is provided a parking brake method, wherein the parking brake method is performed by any one of the parking brake standby units described above, wherein the parking brake method includes the steps of:
after the vehicle is started, the vehicle body electronic stabilizing system of the vehicle carries out self-checking,
if a failure is detected, further determining if the parking brake backup unit has failed,
if yes, the system control module is started when parking is needed, otherwise, the parking brake standby unit is started.
Drawings
The above and other features of the present invention will become apparent with reference to the accompanying drawings, in which,
FIG. 1 shows a schematic view of an embodiment of a parking brake spare unit according to the present invention;
fig. 2 and 3 show a flow chart of an embodiment of a parking brake method according to the invention and of the prior art.
Detailed Description
It is easily understood that according to the technical solution of the present invention, a person skilled in the art can propose various alternative structures and implementation ways without changing the spirit of the present invention.
Referring to FIG. 1, a schematic diagram of one embodiment of a parking brake backup unit according to the present invention is shown. Since the specific shape and connection of the various components are not the subject of the present invention, all of the components are schematically shown in the form of structural modules for the sake of clarity and conciseness, and those skilled in the art can select the appropriate module shape and connection mode at will based on the teaching of the structural diagram. In addition, the structural diagram is given as an embodiment of the invention, and those skilled in the art can make various modifications without departing from the spirit of the invention after referring to the diagram, and the modifications are also within the scope of the invention. As shown in the figure, a system control module 3 (i.e. an original general control module) of the vehicle body electronic stability system is in signal and power connection with a controller 5 of the vehicle body electronic stability system, and the system control module 3 is also in signal connection with a left wheel brake caliper driver 7 and a right wheel brake caliper driver 8, and is in power connection with the right wheel brake caliper driver 8, and is further in power connection with the left wheel brake caliper driver 7 via the right wheel brake caliper driver 8. Furthermore, the system control module 3 is connected to a function light 6 for indicating whether it is activated or not, and the control unit 5 (here, illustratively a microcontroller) is also signal-connected to a parking request signal 11 for real-time detection of the driver's parking intention; the right wheel brake caliper driver 8 and the left wheel brake caliper driver 7 are connected with a left brake caliper 9 and a right brake caliper 10, respectively, for driving the respective brake calipers.
According to the invention, the parking brake backup unit is connected to a controller 5 of a body electronic stability system of a vehicle, to a brake caliper drive of the vehicle and to a power module 4 of the vehicle, wherein the parking brake backup unit is designed to control the brake caliper drive in order to achieve a locking of the vehicle in the event of a failure of a system control module 3 of the body electronic stability system and/or of a parking gear of the vehicle.
It should be understood that parking refers to stopping in a manner that prevents a roll or slip condition. That is, parking is also parking, but there is a limitation more than parking, i.e., the vehicle cannot roll, so that the vehicle can be kept stopped. The parking gear is then the P gear, which is used for parking, for example, for locking the gearbox gears. It uses mechanical device to lock the rotating part of the automobile, so that the automobile can not move. When the vehicle needs to stay in a fixed position for a long period of time, or before leaving the vehicle after a stop, the lever should be pushed into the "P" position. Brake calipers or brake calipers are caliper devices that have the function of decelerating, stopping or holding a moving wheel in a stopped state, for the purpose of mechanically achieving a parking effect. In addition, a vehicle body electronic stability system is a generic term for a system or a program that aims to improve the handling performance of a vehicle while effectively preventing the vehicle from running away when it reaches its dynamic limit. The electronic stabilization program can improve the safety and the controllability of the vehicle. The System helps the vehicle maintain dynamic balance by analyzing the vehicle running state information transmitted from each sensor and then sending a deviation rectifying instruction to an ABS (anti-lock Brake System) and an ASR (Acceleration Slip Regulation) System. ESP can maintain optimal vehicle stability under various conditions, with more pronounced effects in over-steer or under-steer situations. Furthermore, the power module 4 can be, for example, a (12V) small battery in a vehicle.
In order to adapt to situations in which no driver is present in the vehicle in some cases in the event of future automatic parking, parking or automatic driving, the parking brake backup unit has a backup power supply module which is configured at the power module 4 of the vehicle for supplying power to the parking brake backup unit. The power module 4 is thus adapted to a design with a back-up power supply. In this regard, the backup power supply module can be connected to the power control module 2, which is described further below, for providing backup power, while the power module 4 is connected to the existing power control module for providing the usual power support for the system control module 3.
According to the technical scheme, in the case that the system control module 3, namely an original common control module in the ESP, fails, the parking brake standby unit can send a control signal to the brake caliper driver and provide power through the corresponding power module 4 and the microcontroller 5, so that the brake caliper is activated, and standby parking is completed. It can also be seen that the parking brake backup unit interacts with corresponding components of the ESP, so that the parking brake backup unit can be integrated into the vehicle body electronic stability system in order to save and more effectively utilize the vehicle interior. Therein, 2 such brake caliper drives are shown, namely a left wheel brake caliper drive 7 and a right wheel brake caliper drive 8, for driving a left wheel brake caliper 9 and a right wheel brake caliper 10, respectively. The specific corresponding brake caliper driver and brake caliper can be determined according to the actual vehicle type. Furthermore, the solution of the invention enables to be compatible with different suppliers of brake calipers, that is to say it can work with brake calipers of different suppliers, in order to realize, for example, a parking brake system without P range.
Further, the parking brake standby unit is provided with a standby control module 1 and a power control module 2, wherein the standby control module 1 is respectively connected with the controller 5 and the brake caliper driver, and the power control module 2 is respectively connected with the controller 5, the brake caliper driver and the power module 4. In this way, the parking brake backup unit can be subdivided functionally by the backup control module 1 and the power control module 2. In the embodiment shown in the figures in particular, the backup control module 1 is connected to both the right wheel brake caliper drive 8 and the left wheel brake caliper drive 7, so as to be able to control the respective drives synchronously. In addition, the backup control module 1 and the power control module 2 are respectively connected with the right wheel brake caliper driver 8 in a backup power manner, and then are connected with the left wheel brake caliper driver 7 in a backup power manner through the right wheel brake caliper driver 8. In this regard, the power control module 2 can be configured within the overall power management module of the vehicle so that the overall status of the normal power supply and the backup power supply can be monitored. Wherein the integral power management module is connected to the system control module 3, the controller 5 and the right wheel brake caliper driver 8, respectively, for providing general power support. Thus, the power module 4 can be connected to the integral power management module to provide dual provision of normal and backup power. The power module 4 can in each case select a power line (normally also standby) for power take-off in order to ensure that in the event of failure of one of the lines the other can still function.
For example, typically the controller 5 communicates with the system control module 3, while the standby control module 1 is deactivated/deactivated, in which case parking activity is performed as in the existing APB-Mi product flow. In the failure/fault mode, a fault of the controller 5 or the system control module 3 causes the backup control module 1 to switch to an active state, in which case parking activity will be controlled by the backup control module 1.
Similarly to the system control module 3, the parking brake backup unit (e.g. the backup control module 1) is also connected to a function light 6 of the vehicle for visually indicating whether the parking brake backup unit is activated. In this case, the function light 6 can be, for example, an indicator light on the parking brake standby unit or its corresponding module, or also on the dashboard of the vehicle. In addition, the parking brake backup unit (e.g. the backup control module 1) is also configured to receive a parking request signal 11, in order to be able to still know the parking intention of the driver in real time in the event of a failure of the control unit 5. With regard to the parking request signal 11, it should be understood that such a signal can be generated not only by a switch (e.g. an on-board switch) but also by remote control, e.g. in the form of a wireless input, i.e. in some cases the vehicle owner can send the signal outside the vehicle.
Furthermore, the parking brake standby unit (for example, also the standby control module 1) is also designed to receive a wheel speed signal 12, wherein the wheel speed signal 12 can be detected by a wheel speed sensor of the vehicle. The aim of this solution is to be able to detect the operating state of the vehicle even in the event of a problem with the control unit 5 or the system control module 3. For example, in the operation of a vehicle, if it is found that the (electronic) handbrake/caliper cannot be controlled by usual means, the handbrake can be activated by means of the parking brake back-up unit and, at the same time, knowing that the vehicle is in operation, it is possible, for example, to take the "snub" mode, i.e. to control the caliper to contact the wheel briefly and frequently, in view of brake safety and handbrake, wheel life, to complete deceleration. It should be understood that other countermeasures can be taken in some special cases.
It can also be seen from the figure that the parking brake backup unit (e.g. the backup control module 1) is also connected to the system control module 3. This arrangement includes, for example, two purposes, namely facilitating the communication of the mutual state between the parking brake standby unit and the system control module 3; the parking brake backup unit can use modules without failure of the system control module 3 through signal connection (failure of the system control module 3 does not mean that all modules thereof fail, and the parking brake backup unit can know and utilize still effective modules in the system control module 3 through signal connection), such as parking caliper drive monitoring, so that the design and element unit price of the parking brake backup unit can be reduced, and therefore, under the condition that the parking brake backup unit is simple in structure, low in cost and compact, multiple functions can be still realized by utilizing the existing resources as much as possible. That is, the parking brake backup unit (e.g., the backup control module 1) need not be configured as the system control module 3, but rather may primarily accomplish parking in the event of a failure of an existing module.
It should be understood that the connection, communication and power transmission among the modules can be modified according to actual conditions (such as vehicle type).
As regards the type of brake caliper, it can relate not only to traditional mechanical brake calipers, but also to electronic calipers. That is, the brake caliper driver is an electronic caliper driver. The electronic calipers or the electronic hand brakes are the technology for realizing parking braking in an electronic control mode. The working principle of the hand brake is the same as that of a mechanical hand brake, the parking brake is controlled by the friction force generated by a brake disc and a brake pad, and the control mode is changed from the previous mechanical hand brake pull rod into an electronic button. As mentioned above, the solution according to the invention can be applied to various types of brake calipers, independently of the brake caliper manufacturer.
It should be understood that the parking brake standby unit of the present invention may be mounted on various vehicles including gasoline vehicles, diesel vehicles, passenger cars, trucks, buses, hybrid vehicles, electric vehicles, and the like. The subject of the invention is therefore also intended to protect various vehicles equipped with a parking brake backup unit according to the invention, wherein said vehicles can have P range, and also can be without P range.
Referring to fig. 2 and 3, flow charts of the prior art and an embodiment of the parking brake method according to the present invention are shown, respectively. Wherein 101 is ignition on/vehicle start, 102 is self-test, 103 is failure judgment, 104 is true judgment, 105 is false judgment, 106 is brake caliper trigger, 107 is brake caliper work, 108 is locked vehicle, 109 is P lock trigger, 110 is P gear lock work, 111 is locked vehicle; the ignition is turned on/the vehicle is started, 202 is a self-check, 203 is a failure determination, 204 is a false determination, 205 is a true determination, 206 is a trigger brake caliper, 207 is a brake caliper normal operation, 208 is a locked vehicle, 209 is a backup unit failure determination, 210 is a true determination, 211 is a false determination, 212 is a trigger brake caliper, 213 is a brake backup unit operation, and 214 is a locked vehicle.
As can be seen from fig. 2, in the prior art, parking is performed by using a brake caliper and a P-lock/P-range. Under the condition that no failure is detected by self-checking, a brake caliper is adopted; and when failure is detected, the vehicle is parked by adopting the P gear.
However, in particular in the case of a vehicle without P range (which, as mentioned above, is also a future trend), according to a further aspect of the invention (as exemplarily seen in fig. 3), the invention provides a parking brake method, wherein the parking brake method is performed by any of the parking brake backup units mentioned above, wherein the parking brake method comprises the steps of:
after the vehicle is started, the vehicle body electronic stabilizing system of the vehicle carries out self-checking,
if a failure is detected, further determining if the parking brake backup unit has failed,
if so, the system control module 3 is started when parking is required, otherwise the parking brake standby unit is started.
It can be seen that, firstly, in the failure determination 203, the failure determination as a whole, i.e. whether the original normal control module/controller fails or the parking brake backup unit/backup control module fails, is performed by self-checking (which can be done by the ESP), so that the determination result is true 205. If none is failed, a false 204 determination is output and the vehicle is locked via the brake caliper via the original mode similar to that in the prior art. If the output is true, it is further determined whether the parking brake backup unit has failed, if so, this means that the original control mode has not failed, and then go back to step 206, if not, this means that the original control mode has failed, in which case the final parking operation is completed by controlling the brake caliper operation using the parking brake backup unit. In addition, it should be noted that, after the vehicle is started, the vehicle body electronic stability system of the vehicle optionally performs periodic self-tests, so that the vehicle can be monitored throughout its operation.
In summary, the technical solution of the present invention can ensure that in case of a failure of the first control logic or circuit or power, there is a backup means for controlling the motor on the caliper even without P-lock if necessary for stopping the vehicle and still meet the requirements of the standard GB 21670.
It should be understood that all of the above preferred embodiments are exemplary and not restrictive, and that various modifications and changes in the specific embodiments described above, which would occur to persons skilled in the art upon consideration of the above teachings, are intended to be within the scope of the invention.
Claims (10)
1. Parking brake backup unit, characterized in that it is connected with a controller (5) of a body electronic stability system of a vehicle, a brake caliper drive of the vehicle and a power module (4) of the vehicle, respectively, wherein the parking brake backup unit is configured for controlling the brake caliper drive in case of failure of a system control module (3) of the body electronic stability system and/or a parking gear of the vehicle in order to achieve locking of the vehicle.
2. Parking brake backup unit according to claim 1, characterized in that it has a backup control module (1) and a power control module (2), wherein the backup control module (1) is connected with the controller (5) and the brake caliper drive, respectively, and the power control module (2) is connected with the controller (5), the brake caliper drive and the power module (4), respectively.
3. Parking brake standby unit according to claim 1, characterized in that it is also connected with a function light (6) of the vehicle for visually displaying whether the parking brake standby unit is activated or not.
4. Parking brake backup unit according to claim 1, characterized in that the parking brake backup unit is further configured for receiving a parking request signal (11) and/or a wheel speed signal (12).
5. Parking brake standby unit according to claim 1, characterized in that it is also connected with the system control module (3).
6. Parking brake standby unit according to claim 1, characterized in that the brake caliper driver is an electronic caliper driver.
7. Parking brake standby unit according to claim 1, characterized in that it has a standby power supply module configured at a power module (4) of the vehicle for powering the parking brake standby unit.
8. Parking brake standby unit according to any of claims 1-7, characterized in that the parking brake standby unit is built into the vehicle body electronic stability system.
9. Vehicle, characterized in that it has a parking brake backup unit according to claim 8.
10. Parking brake method, characterized in that it is performed by a parking brake backup unit according to any of claims 1-8, wherein it comprises the following steps:
after the vehicle is started, the vehicle body electronic stabilizing system of the vehicle carries out self-checking,
if a failure is detected, further determining if the parking brake backup unit has failed,
if yes, the system control module (3) is started when parking is needed, otherwise the parking brake standby unit is started.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237072.0A CN111746483A (en) | 2019-03-27 | 2019-03-27 | Parking brake backup unit, vehicle and parking brake method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237072.0A CN111746483A (en) | 2019-03-27 | 2019-03-27 | Parking brake backup unit, vehicle and parking brake method |
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| CN111746483A true CN111746483A (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910237072.0A Pending CN111746483A (en) | 2019-03-27 | 2019-03-27 | Parking brake backup unit, vehicle and parking brake method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112622845A (en) * | 2020-12-23 | 2021-04-09 | 万向钱潮股份有限公司 | Hot standby electronic parking brake system coordination control method |
| CN112644445A (en) * | 2020-12-18 | 2021-04-13 | 浙江合众新能源汽车有限公司 | Electronic parking braking system based on EHB and ESC double-circuit control |
| CN112744214A (en) * | 2021-01-19 | 2021-05-04 | 广州橙行智动汽车科技有限公司 | Control system and control method for remote control parking of vehicle and vehicle |
| CN114228676A (en) * | 2022-01-06 | 2022-03-25 | 安徽中车瑞达电气有限公司 | Automatic parking method and system for electric vehicle |
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| CN112622845A (en) * | 2020-12-23 | 2021-04-09 | 万向钱潮股份有限公司 | Hot standby electronic parking brake system coordination control method |
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| CN114228676A (en) * | 2022-01-06 | 2022-03-25 | 安徽中车瑞达电气有限公司 | Automatic parking method and system for electric vehicle |
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