CN107856656B

CN107856656B - Dynamic braking device and method

Info

Publication number: CN107856656B
Application number: CN201610841601.4A
Authority: CN
Inventors: 刘松山; N·契里亚尼奇
Original assignee: Continental Tamic Automotive Systems Shanghai Co ltd
Current assignee: Continental Tamic Automotive Systems Shanghai Co ltd
Priority date: 2016-09-22
Filing date: 2016-09-22
Publication date: 2021-03-19
Anticipated expiration: 2036-09-22
Also published as: CN107856656A

Abstract

The embodiment of the invention provides a dynamic brake device and a method. The dynamic brake device comprises a switch, a switch movement sensor, a control unit and an actuating mechanism. The switch multiplexes the electronic parking switch of the vehicle. The switch movement sensor is configured to detect movement information of the switch and transmit the movement information to the control unit. The control unit is configured to generate a brake control command according to the movement information and transmit the brake control command to the actuator. The actuator causes the vehicle to generate a deceleration in accordance with the brake control command, the deceleration having a value corresponding to the movement information of the movable switch member. The driver can operate the electronic parking switch to generate deceleration for the vehicle. The value of the deceleration corresponds to the movement information of the electronic parking switch to reflect the driver's desire.

Description

Dynamic braking device and method

Technical Field

The invention relates to the technical field of motor vehicles, in particular to a dynamic brake device and a dynamic brake method.

Background

Typically, the driver applies the brakes using the service brakes when the vehicle is in motion (driving). When the vehicle is in a parking state, the driver uses the parking switch to brake. However, in some situations (e.g., a foot brake failure), the driver also desires to be able to brake the running vehicle using the parking switch. At this time, for the parking system using the hand brake, only the rear wheel can be braked, which may affect safety during the running of the vehicle. For a parking system using an electronic parking switch, a signal of the electronic parking switch may be transmitted to an electronic stability controller of a vehicle, and a command for simultaneous braking of all wheels may be generated by the electronic stability controller. However, the braking process causes the deceleration generated by the vehicle to be a preset constant value and cannot be changed according to the requirements of the driver, which affects the driving experience. Also, in some cases, the safety of occupants in the vehicle may be compromised because the deceleration of the vehicle is excessive.

There is room for improvement in a dynamic brake apparatus using a parking switch.

Disclosure of Invention

The embodiment of the invention provides a dynamic brake device and a method.

According to a first aspect of the present invention, there is provided a dynamic brake device including a switch, a switch movement sensor, a control unit, and an actuator. The switch multiplexes the electronic parking switch of the vehicle. The switch movement sensor is configured to detect movement information of the switch and transmit the movement information to the control unit. The control unit is configured to generate a brake control command according to the movement information and transmit the brake control command to the actuator. The actuator causes the vehicle to generate a deceleration in accordance with the brake control command, the deceleration having a value corresponding to the movement information of the movable switch member.

In an embodiment of the invention, the control unit is an electronic stability controller of the vehicle. The actuator is a brake mechanism of the vehicle.

In an embodiment of the invention, the movement information comprises a value of the position, and the value of the deceleration corresponds to a value of the position of the switch.

In an embodiment of the invention, the movement information comprises a value of the speed, and the value of the deceleration corresponds to a value of the speed of the switch.

In an embodiment of the invention, the movement information comprises a value of position and a value of speed, the value of deceleration corresponding to the value of position and the value of speed of the switch.

In an embodiment of the invention, the value of the deceleration is equal to the sum of a first deceleration, which corresponds to the value of the position of the switch, and a second deceleration, which corresponds to the value of the speed of the switch.

In an embodiment of the invention, the second deceleration is equal to zero when the value of the position of the switch is less than the predetermined threshold.

According to a second aspect of the present invention, there is provided a dynamic braking method, comprising: acquiring movement information of an electronic parking switch; generating a brake control command according to the movement information; and according to the brake control command, enabling the vehicle to generate deceleration, wherein the value of the deceleration corresponds to the movement information.

According to the dynamic braking device and the method, during the running process of the automobile, the driver can operate the electronic parking switch to enable the automobile to generate deceleration. The value of the deceleration corresponds to the movement information of the electronic parking switch to reflect the driver's desire.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings of the embodiments will be briefly described below, it being understood that the drawings described below relate only to some embodiments of the present invention and are not limiting thereof, wherein:

FIG. 1 is a block diagram of a dynamic braking apparatus provided in an embodiment of the present invention;

FIG. 2 is a schematic diagram of the switch and position sensor shown in FIG. 1;

FIG. 3 is a schematic illustration of a first deceleration value versus switch position;

FIG. 4 is a schematic illustration of a second deceleration value versus switching speed;

FIG. 5 is a flowchart of a dynamic braking method according to an embodiment of the present invention;

fig. 6 is another flowchart of a dynamic braking method according to an embodiment of the present invention.

Detailed Description

In order to make the technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention without any inventive step, also belong to the scope of protection of the invention.

Fig. 1 is a block diagram of a dynamic braking apparatus according to an embodiment of the present invention. As shown in fig. 1, the dynamic braking apparatus 1 includes a switch 2, a switch movement sensor 3, a control unit 4, and an actuator 5. The switch 2 multiplexes an electronic parking switch of the vehicle. The switch movement sensor 3 is configured to detect movement information of the switch 2 and transmit the movement information to the control unit 4. The control unit 4 is configured to generate a brake control command according to the movement information and transmit the brake control command to the actuator 5. The actuator 5 generates a deceleration of the vehicle according to the brake control command, the value of the deceleration corresponding to the information on the movement of the movable switching member.

According to the dynamic brake device of the embodiment of the invention, a driver can operate the electronic parking switch to enable the automobile to generate deceleration during the running of the automobile. The value of the deceleration corresponds to the movement information of the electronic parking switch to reflect the driver's desire.

The control unit 3 may multiplex an Electronic Stability Controller (ESC) of the vehicle. The actuator 5 may be reused as a brake mechanism for the vehicle. Therefore, according to the dynamic brake apparatus of the embodiment of the present invention, it is possible to easily upgrade the existing dynamic brake apparatus using the electronic parking switch, and an improved dynamic brake function is realized through the installation of the switch movement sensor 3 and the upgrade of the electronic stability controller. The driver can brake the vehicle dynamically and comfortably by means of the electronic parking switch, which increases the utilization of the device. The device can be used as a backup or replacement for the service brake to perform regular braking of the vehicle, which is particularly advantageous when the service brake fails or the driver does not have the convenience to operate the service brake.

Fig. 2 is a schematic diagram of the switch and movement sensor shown in fig. 1. As shown in fig. 2, the switch 2 is lifted from the initial position, the linear distance of movement of one end of the switch 2 is L, and the angle of rotation of the switch 2 is a. The movement sensor 3 can acquire the position of the switch 2, i.e., the value of L or a, and can also acquire the speed of the switch 2, i.e., the amount of change in L or a per unit time. The control unit 4 generates a brake control command based on these values.

It should be understood that a raised electronic park switch is shown in fig. 2, but other types (e.g., push button) of electronic park switches may be used.

Fig. 3 is a schematic diagram of the relationship of the first deceleration value to the switch position. As shown in fig. 3, the control unit 4 may generate a brake control command based only on the position (L or a) of the switch 2 so that the vehicle produces the first deceleration. The value of the first deceleration of the vehicle and the value of the switch position may be in a stepwise relationship. For example, the first deceleration takes on a constant value when the value of the switch position is in the first range of values. The value of the first deceleration is linearly related to the value of the switch position when the value of the switch position is within the second range of values. For example, when the value range of a is 0 to 15 degrees (normalized expression is 0 to 0.3), the value range of the first deceleration is a constant value of 0.3 g. When the value range of a is 15-50 degrees (normalized expression is 0.3-1), the value of the first deceleration is linearly related to the switch position, and the value range is 0.3-0.6 g. It should be understood that the maximum value of a may be other values such as 60 degrees, depending on the switch type. The maximum value of the first deceleration may be other values, and 0.6g is selected here, so that the vehicle can be applied to different traveling speeds of the vehicle, and requirements for both braking and safety can be satisfied.

Fig. 4 is a schematic diagram of the relationship of the second deceleration value to the switching speed. As shown in fig. 3, the control unit 4 may also generate a brake control command to cause a second deceleration to be produced by the vehicle in dependence on the speed of the switch 2. The second deceleration of the vehicle may be in a stepwise relationship with the switching speed value. For example, the value of the switching speed comprises a plurality of ranges, each range corresponding to a constant second deceleration value. For example, when the switching speed is in a first range (e.g., 0 to 50 degrees/s), the second deceleration is 0 g. When the value of the switching speed is in a second range (for example, 50-100 degrees/s), the second deceleration is 0.1 g. When the value of the switching speed is in a third range (for example, 100-200 degrees/s), the second deceleration is in a value range of 0.2 g. When the value of the switching speed is in a fourth range (for example, 200-350 degrees/s), the second deceleration is in a value range of 0.3 g. When the switching speed is in a fifth range (e.g., >350 degrees/s), the second deceleration is in a range of 0.4 g.

The information on the speed of the switch 2 can be obtained directly by the switch movement sensor 3 or by the control unit 4 by recording and comparing values of the position of the switch 2 at different points in time.

The control unit 4 may generate brake control commands based on both the position and the speed of the switch 2. At this time, the deceleration of the vehicle is equal to: the first deceleration value corresponding to the switch position information is added to the second deceleration value corresponding to the switch speed information. After normalizing the switch position value, if the switch position value is less than 1, it is determined that the driver is not braking with full force, and only the first deceleration may be used, i.e., the second deceleration may be made equal to zero. If the switch position value is equal to 1, i.e. the driver has reached the maximum travel for a short period of time, which indicates that the driver is fully braking, the vehicle requires additional deceleration, and therefore the second deceleration value takes the above-mentioned calculated value. Meanwhile, in the embodiment of the present invention, the generated maximum deceleration value may be set to 1g to prevent additional damage.

According to the embodiment of the invention, the non-emergency situation that the driver does not brake with full force and the emergency situation that the driver brakes with full force are distinguished, and the value of the vehicle deceleration can well reflect the expectation of the driver.

Fig. 5 is a flowchart of a dynamic braking method according to an embodiment of the present invention. As shown in fig. 5, the dynamic braking method starts in step S501, and movement information of the electronic parking switch is acquired. The movement information may contain values for position and/or velocity. The movement information may be acquired by the switch movement sensor 3 described above and transmitted to the control unit 4. Then, in step S502, a brake control command is generated based on the movement information. The braking control command may be generated by the control unit 4 as described above and transmitted to the actuator 5. The control unit 4 may be an Electronic Stability Controller (ESC) of the vehicle, and the actuator 5 may be a brake mechanism of the vehicle. Finally, in step S503, the vehicle is caused to generate deceleration according to the brake control command, and the value of the deceleration corresponds to the movement information.

The movement information may comprise a value of the position, the value of the deceleration corresponding to the value of the position of the switch. The movement information may also comprise a value of the speed, the value of the deceleration corresponding to the value of the speed of the switch. The movement information may also comprise values for position and speed, the values for deceleration corresponding to the values for position and speed of the switch. The value of the deceleration may be equal to a sum of a first deceleration corresponding to a value of the position of the switch and a second deceleration corresponding to a value of the speed of the switch. The second deceleration may also be equal to zero when the value of the position of the switch is less than the predetermined threshold.

According to the dynamic braking method of the embodiment of the invention, a driver can operate the electronic parking switch to enable the automobile to generate deceleration during the running of the automobile. The value of the deceleration corresponds to the movement information of the electronic parking switch to reflect the driver's desire.

It should be understood that the dynamic braking device and method provided by the embodiment of the invention do not affect the operation mode and function of the existing electronic parking switch and other components, and the convenience of operation is improved.

Fig. 6 is another flowchart of a dynamic braking method according to an embodiment of the present invention. As shown in fig. 6, the electronic parking switch may still have two modes of operation: pressed and raised. In step S601, the operation of the electronic parking switch is determined, and if the electronic parking switch is pressed, the process proceeds to step S602, the Electronic Parking Brake (EPB) is released, and the vehicle enters a state ready for traveling. If the vehicle is lifted, the parking or dynamic braking mode is entered. At this time, in step S603, the Electronic Stability Controller (ESC) first receives other information of the vehicle, for example, vehicle speed information, and determines the vehicle speed information in step S604. When the vehicle speed is low, for example, less than 3kph, the process proceeds to step S605, and the electronic parking brake is directly activated to perform braking, so as to achieve parking. When the vehicle speed is large, for example, greater than 3kph, the process proceeds to step S606 to acquire movement information of the electronic parking switch, and then proceeds to step S607 when the movement information is available, so as to implement dynamic braking according to the dynamic braking method described above. For the driver, the operation mode is not changed, the operation result can reflect the real intention of the driver, and the safety is improved.

Further, in order to increase the stability of the dynamic braking system, when the movement information of the electronic parking switch is unreliable, the process proceeds to step S608, and the vehicle is directly caused to generate a predetermined deceleration, for example, 0.6 g. This covers the existing dynamic braking function and ensures the stability of the system.

It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A dynamic brake device comprises a switch, a switch movement sensor, a control unit and an actuating mechanism;

the method is characterized in that the switch is multiplexed with an electronic parking switch of the vehicle;

the switch movement sensor is configured to detect movement information of the switch and transmit the movement information to the control unit;

the control unit is configured to generate a brake control command according to the movement information and transmit the brake control command to the actuator;

the actuating mechanism enables the vehicle to generate deceleration according to the brake control command, and the value of the deceleration corresponds to the movement information of the switch;

the movement information includes a value of a position and a value of a speed, and the value of the deceleration corresponds to the value of the position and the value of the speed of the switch;

wherein the value of the deceleration is equal to the sum of a first deceleration corresponding to the value of the position of the switch and a second deceleration corresponding to the value of the speed of the switch;

when the value of the switch position is in a first value range, the first deceleration value is a constant value; when the value of the switch position is in the second value range, the value of the first deceleration is linearly related to the value of the switch position;

wherein the value of the switching speed comprises a plurality of ranges, each range corresponding to a constant second deceleration value;

wherein the second deceleration is equal to zero when the value of the position of the switch is less than a predetermined threshold.

2. The dynamic brake apparatus of claim 1, wherein the control unit is an electronic stability controller of a vehicle; the actuating mechanism is a brake mechanism of the vehicle.

3. A dynamic braking method, comprising:

acquiring movement information of an electronic parking switch;

generating a brake control command according to the movement information;

according to the brake control command, enabling a vehicle to generate deceleration, wherein the value of the deceleration corresponds to the movement information;