CN111038469A

CN111038469A - Electronic parking system and method

Info

Publication number: CN111038469A
Application number: CN201911403994.0A
Authority: CN
Inventors: 刘鹏坤; 狄帅; 曹树魏; 姚维; 李明安
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-04-21
Anticipated expiration: 2039-12-30
Also published as: CN111038469B

Abstract

The invention discloses an electronic parking system and a method, comprising the following steps: the device comprises a rear braking air reservoir 1, a parking braking air reservoir 2, an EBS rear axle module 3, a spring energy storage air chamber 4, a differential relay valve 5, a two-wire two-position three-way electromagnetic valve 6, an EBS braking valve 7, an electronic parking electronic control unit 8, an electronic parking switch 9, a whole vehicle communication network 10 and an EBS electronic control unit 11. The EPB is connected to the whole vehicle communication network 10, so that the combination of the EPB and the EBS is realized, and the EPB and the EBS can be mutually matched for braking.

Description

Electronic parking system and method

Technical Field

The invention relates to the field of automobile control, in particular to an electronic parking system and method.

Background

With the development of science and technology and economy, automobiles become more and more popular in daily life. In order to improve the braking performance of automobiles, particularly commercial automobiles, Electronic Brake Systems (EBS) are increasingly being used in automobiles. EBS is developed based on an anti-lock brake system and an anti-skid system, and electronic control is used for replacing the traditional mechanical transmission to control the brake system, so that a good brake effect is achieved, and the brake safety of the automobile is improved. An electronic parking brake system (EPB) can replace a traditional pull rod hand brake with an electronic hand brake button, so that a driver can operate the EPB more conveniently during parking brake. Currently, the EBS and EPB cannot cooperate with each other to perform braking, for example, when the ESB fails, the EPB cannot directly take over the ESB to perform braking or activate an anti-lock function.

Disclosure of Invention

The present invention provides an electronic parking system and method. The system and the method can effectively combine the ESB and the EPB, so that the ESB and the EPB can cooperate with each other to brake.

In order to achieve the above object, the present invention provides the following technical solutions:

a first aspect of the present invention discloses an electronic parking system, the system including: a rear braking air cylinder 1, a parking braking air cylinder 2, an EBS rear axle module 3, a spring energy storage air chamber 4, a differential relay valve 5, a two-wire two-position three-way electromagnetic valve 6, an EBS braking valve 7, an electronic parking electronic control unit 8, an electronic parking switch 9, a whole vehicle communication network 10 and an EBS electronic control unit 11,

the rear brake air cylinder 1 is connected with an air inlet of the EBS brake valve 7 through a pipeline, an air outlet of the EBS brake valve 7 is connected with a control port of the EBS rear axle module 3 through a pipeline, an air outlet of the EBS brake valve 7 is also connected with a No. 2 control port of the differential relay valve 5 through a pipeline, the rear brake air cylinder 1 is connected with an air inlet of the EBS rear axle module 3 through a pipeline, and an air outlet of the EBS rear axle module 3 is connected with a cavity A of the spring energy storage air chamber 4 through a pipeline;

the parking braking air cylinder 2 is connected with an air inlet of the double-wire two-position three-way electromagnetic valve 6 through a pipeline, an air outlet of the double-wire two-position three-way electromagnetic valve 6 is connected with a No. 1 control port of the differential relay valve 5 through a pipeline, an air inlet of the differential relay valve 5 is connected with the parking braking air cylinder 2 through a pipeline, an air outlet of the differential relay valve 5 is connected with a cavity B of the spring energy storage air chamber 4 through a pipeline, and the electronic parking electronic control unit 8 is electrically connected with a release coil and a parking coil of the double-wire two-position three-way electromagnetic valve 6 respectively;

the electronic parking switch 9 is electrically connected with the electronic parking electronic control unit 8, the whole vehicle communication network 10 is electrically connected with the electronic parking electronic control unit 8, and the EBS electronic control unit 11 is electrically connected with the whole vehicle communication network 10.

Optionally, the EBS brake valve 7 is further electrically connected to the EBS rear axle module 3, and the EBS brake valve 7 controls the opening degree of the control port of the EBS rear axle module 3 according to a brake pedal signal.

Alternatively to this, the first and second parts may,

when the automobile is braked, the EBS brake valve 7 receives a brake signal of a brake pedal, the air outlet of the EBS brake valve 7 is communicated with the control port of the EBS rear axle module 3, the air outlet of the EBS brake valve 7 conveys air to the control port of the EBS rear axle module 3 to control the air inlet and the air outlet of the EBS rear axle module 3 to be communicated, and the air in the rear brake air storage cylinder 1 enters the cavity A of the spring air storage chamber 4 to generate a braking action;

when the service brake is released, the EBS brake valve 7 receives a brake release signal of a brake pedal, the gas outlet of the EBS brake valve 7 is not communicated with the control port of the EBS rear axle module 3, the gas outlet of the EBS brake valve 7 does not convey gas to the control port of the EBS rear axle module 3 to control the gas outlet and the gas outlet of the EBS rear axle module 3 to be communicated, and the gas in the cavity A of the spring gas storage chamber 4 is exhausted to the atmosphere through the gas outlet of the EBS rear axle module 3 to release the brake function.

Alternatively to this, the first and second parts may,

when parking braking is carried out, the electronic parking switch 9 receives a parking braking signal and sends the parking braking signal to the electronic parking electronic control unit 8, the electronic parking electronic control unit 8 sends an electric signal to a parking coil of the two-wire two-position three-way electromagnetic valve 6, so that a gas outlet and a gas outlet of the two-wire two-position three-way electromagnetic valve 6 are communicated, the gas outlet of the two-wire two-position three-way electromagnetic valve 6 cannot convey gas to the No. 1 control port of the differential relay valve 5, the gas outlet and the gas outlet of the differential relay valve 5 are communicated, and gas in the cavity B of the spring gas storage chamber 4 is exhausted to the atmosphere through the gas outlet of the differential relay valve 5 and/or the gas outlet of the two-wire two-position three-way electromagnetic valve 6 to generate a braking;

when parking brake is released, the electronic parking switch 9 receives a parking brake signal and sends the parking brake release signal to the electronic parking electronic control unit 8, the electronic parking electronic control unit 8 sends an electric signal to the parking coil of the two-wire two-position three-way electromagnetic valve 6, so that the air inlet and the air outlet of the two-wire two-position three-way electromagnetic valve 6 are communicated, the air outlet of the two-wire two-position three-way electromagnetic valve 6 conveys air to the No. 1 control port of the differential relay valve 5, so that the air inlet and the air outlet of the differential relay valve 5 are communicated, and the air in the parking brake air storage cylinder 2 enters the cavity B of the spring air storage chamber 4 to release the braking effect.

Optionally, the electronic parking electronic control unit 8 obtains a service braking instruction, and reads a current vehicle speed and a current wheel speed through the vehicle communication network 10 at a first time after obtaining the service braking instruction, the electronic parking electronic control unit 8 determines whether the current vehicle speed is greater than a theoretical vehicle speed corresponding to the current wheel speed and a difference between the current vehicle speed and the theoretical vehicle speed is greater than a preset difference, if so, the electronic parking electronic control unit 8 starts anti-lock braking;

the electronic parking electronic control unit 8 is specifically configured to: the electronic parking control unit 8 sends an electric signal to a parking coil of the two-wire two-position three-way electromagnetic valve 6, so that an air inlet and an air outlet of the two-wire two-position three-way electromagnetic valve 6 are communicated, the air outlet of the two-wire two-position three-way electromagnetic valve 6 transmits air to the No. 1 control port of the differential relay valve 5, so that the air inlet and the air outlet of the differential relay valve 5 are communicated, and the air in the parking braking air storage cylinder 2 enters the cavity B of the spring air storage chamber 4 to reduce braking force; the electronic parking electronic control unit 8 sends an electric signal to the parking coil of the two-wire two-position three-way electromagnetic valve 6, so that the gas outlet and the gas outlet of the two-wire two-position three-way electromagnetic valve 6 are communicated, the gas outlet of the two-wire two-position three-way electromagnetic valve 6 cannot convey gas to the No. 1 control port of the differential relay valve 5, so that the gas outlet and the gas outlet of the differential relay valve 5 are communicated, and gas in the cavity B of the spring gas storage chamber 4 passes through the gas outlet of the differential relay valve 5 and/or the gas outlet of the two-wire two-position three-way electromagnetic valve 6 is exhausted into the atmosphere to improve braking force.

Optionally, the electronic parking electronic control unit 8 reads the pressure in the rear brake air cylinder 1 through the vehicle communication network 10, determines whether the pressure is smaller than a first pressure threshold, and if so, the electronic parking electronic control unit 8 starts anti-lock braking;

The second aspect of the invention discloses an electronic parking method, which is applied to the electronic parking system, and comprises the following steps:

when the service brake is released, the EBS brake valve 7 receives a brake release signal of a brake pedal, the gas outlet of the EBS brake valve 7 is not communicated with the control port of the EBS rear axle module 3, the gas outlet of the EBS brake valve 7 does not convey gas to the control port of the EBS rear axle module 3 to control the gas outlet and the gas outlet of the EBS rear axle module 3 to be communicated, and the gas in the cavity A of the spring gas storage chamber 4 is exhausted to the atmosphere through the gas outlet of the EBS rear axle module 3 to release the brake function;

Optionally, the EBS brake valve 7 is further electrically connected to the EBS rear axle module 3, and the method further includes:

and the EBS brake valve 7 controls the opening degree of a control port of the EBS rear axle module 3 according to the brake pedal signal.

Optionally, the method further includes:

the electronic parking electronic control unit 8 obtains a service braking instruction, reads a current vehicle speed and a current wheel speed through the whole vehicle communication network 10 at a first moment after the service braking instruction is obtained, the electronic parking electronic control unit 8 judges whether the current vehicle speed is greater than a theoretical vehicle speed corresponding to the current wheel speed or not and the difference between the current vehicle speed and the theoretical vehicle speed is greater than a preset difference, and if so, the electronic parking electronic control unit 8 starts anti-lock braking;

Optionally, the method further includes:

the electronic parking electronic control unit 8 reads the pressure in the rear brake air cylinder 1 through the whole vehicle communication network 10, determines whether the pressure is smaller than a first pressure threshold value, and if so, the electronic parking electronic control unit 8 starts anti-lock braking;

The invention discloses an electronic parking system and a method, comprising the following steps: the brake system comprises a rear brake air cylinder 1, a parking brake air cylinder 2, an EBS rear axle module 3, a spring energy storage air chamber 4, a differential relay valve 5, a two-wire two-position three-way electromagnetic valve 6, an EBS brake valve 7, an electronic parking electronic control unit 8, an electronic parking switch 9, a whole vehicle communication network 10 and an EBS electronic control unit 11, wherein the rear brake air cylinder 1 is connected with an air inlet of the EBS brake valve 7 through a pipeline, an air outlet of the EBS brake valve 7 is connected with a control port 2 of the EBS rear axle module 3 through a pipeline, an air outlet of the EBS brake valve 7 is also connected with a control port 2 of the differential relay valve 5 through a pipeline, the rear brake air cylinder 1 is connected with an air inlet of the EBS rear axle module 3 through a pipeline, and an air outlet of the EBS rear axle module 3 is connected with a cavity A of; the parking braking air cylinder 2 is connected with an air inlet of the double-wire two-position three-way electromagnetic valve 6 through a pipeline, an air outlet of the double-wire two-position three-way electromagnetic valve 6 is connected with a No. 1 control port of the differential relay valve 5 through a pipeline, an air inlet of the differential relay valve 5 is connected with the parking braking air cylinder 2 through a pipeline, an air outlet of the differential relay valve 5 is connected with a cavity B of the spring energy storage air chamber 4 through a pipeline, and the electronic parking electronic control unit 8 is respectively electrically connected with a release coil and a parking coil of the double-wire two-position three; the electronic parking switch 9 is electrically connected with the electronic parking electronic control unit 8, the whole vehicle communication network 10 is electrically connected with the electronic parking electronic control unit 8, and the EBS electronic control unit 11 is electrically connected with the whole vehicle communication network 10. According to the invention, the EPB is accessed into the whole vehicle communication network 10, so that the combination of the EPB and the EBS is realized, and the EPB and the EBS can be mutually matched for braking. The invention can lead the EPB and the EBS to be matched to achieve better braking effect and higher braking safety.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.

Fig. 1 is a schematic structural diagram of an electronic parking system according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a two-wire two-position three-way electromagnetic valve according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of a differential relay valve according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of an EBS rear axle module according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a spring energy-storing air chamber according to an embodiment of the present invention;

fig. 6 is a flowchart illustrating a temporary parking control strategy according to an embodiment of the present invention.

Detailed Description

The invention discloses an electronic parking system and a method thereof, and a person skilled in the art can take the contents of the text for reference and appropriately modify the technical details to realize the electronic parking system. It is expressly intended that all such similar substitutes and modifications which would be obvious to one skilled in the art are deemed to be included in the invention. While the methods and applications of this invention have been described in terms of preferred embodiments, it will be apparent to those of ordinary skill in the art that variations and modifications in the methods and applications described herein, as well as other suitable variations and combinations, may be made to implement and use the techniques of this invention without departing from the spirit and scope of the invention.

Fig. 1 is a schematic structural diagram of an electronic parking system disclosed in an embodiment of the present invention, where in fig. 1, 1 is a rear brake air reservoir, 2 is a parking brake air reservoir, 3 is an EBS rear axle module, 4 is a spring energy storage air chamber, 5 is a differential relay valve, 6 is a two-wire two-position three-way electromagnetic valve, 7 is an EBS brake valve, 8 is an electronic parking electronic control unit, 9 is an electronic parking switch, 10 is a vehicle communication network, and 11 is an EBS electronic control unit. In fig. 1,

ports

11 and 12 of the EBS rear axle module 3 are air inlets,

ports

21 and 22 of the EBS rear axle module 3 are air outlets,

ports

31 and 32 of the EBS rear axle module 3 are air outlets, and ports 4 of the EBS rear axle module 3 are control ports; a port 1 of the differential relay valve 5 is an air inlet, two ports 2 of the differential relay valve 5 are air outlets, a port 3 of the differential relay valve 5 is an air outlet, a port 41 of the differential relay valve 5 is a control port No. 1, and a port 42 of the differential relay valve 5 is a control port No. 2; a port 1 of the double-line two-position three-way electromagnetic valve 6 is an air inlet, a port 2 of the double-line two-position three-way electromagnetic valve 6 is an air outlet, and a port 3 of the double-line two-position three-way electromagnetic valve 6 is an air outlet; the port 1 of the EBS brake valve 7 is an air inlet, the port 2 of the EBS brake valve 7 is an air outlet, the solid line in the figure is a pipeline connection, and the dotted line is an electric connection.

As shown in fig. 1, an electronic parking system according to an embodiment of the present invention includes: a rear braking air cylinder 1, a parking braking air cylinder 2, an EBS rear axle module 3, a spring energy storage air chamber 4, a differential relay valve 5, a two-wire two-position three-way electromagnetic valve 6, an EBS braking valve 7, an electronic parking electronic control unit 8, an electronic parking switch 9, a whole vehicle communication network 10 and an EBS electronic control unit 11,

the rear brake air cylinder 1 is connected with an air inlet of the EBS brake valve 7 through a pipeline, an air outlet of the EBS brake valve 7 is connected with a control port of the EBS rear axle module 3 through a pipeline, an air outlet of the EBS brake valve 7 is also connected with a control port No. 2 of the differential relay valve 5 through a pipeline, the rear brake air cylinder 1 is connected with an air inlet of the EBS rear axle module 3 through a pipeline, an air outlet of the EBS rear axle module 3 is connected with a cavity A of the spring energy storage air chamber 4 through a pipeline, and the loop is used for service braking.

The parking braking air cylinder 2 is connected with an air inlet of the double-wire two-position three-way electromagnetic valve 6 through a pipeline, an air outlet of the double-wire two-position three-way electromagnetic valve 6 is connected with a No. 1 control port of the differential relay valve 5 through a pipeline, an air inlet of the differential relay valve 5 is connected with the parking braking air cylinder 2 through a pipeline, an air outlet of the differential relay valve 5 is connected with a cavity B of the spring energy storage air chamber 4 through a pipeline, the electronic parking electronic control unit 8 is respectively electrically connected with a release coil and a parking coil of the double-wire two-position three-way electromagnetic valve 6, and.

It should be noted that, in the case where all the components can work normally, the EBS electronic control unit 11 manages service braking, and includes: starting the anti-locking function, managing the parking brake by the electronic parking electronic control unit 8 without intervening the service brake, and calling the whole vehicle communication Network as Controller Area Network, CAN bus.

Optionally, the two-wire two-position three-way solenoid valve 6 is configured as shown in fig. 2, the port 1 is an air inlet of the two-wire two-position three-way solenoid valve 6, the port 1 is connected with the parking brake air reservoir 2 through a pipeline, the port 2 is an air outlet of the two-wire two-position three-way solenoid valve 6, the port 2 is connected with the control port No. 1 of the differential relay valve 5 through a pipeline, the port 3 is an air outlet of the two-wire two-position three-way solenoid valve 6, m is a release coil, and n is a parking coil. When parking braking is carried out, the n is electrified, and the air outlet is controlled to be communicated with the exhaust port; when the parking brake is released, the m is electrified to control the conduction of the air inlet and the air outlet.

Optionally, the differential relay valve 5 is configured as shown in fig. 3, port 1 is an air inlet of the differential relay valve 5, port 1 is connected to the parking brake air cylinder 2 through a pipeline, port 2 is an air outlet of the differential relay valve 5, port 2 is connected to the B cavity of the spring energy storage air chamber 4 through a pipeline, because the spring energy storage air chamber 4 is provided with two air chambers and the two air chambers are symmetrical as shown in fig. 1, two air outlets are respectively connected to the B cavities of the two air chambers of the spring energy storage air chamber 4, port 3 is an air outlet of the differential relay valve 5, port 41 is a control port No. 1 of the differential relay valve 5, port 41 is connected to the air outlet of the two-wire two-position three-way electromagnetic valve 6 through a pipeline, port 42 is a control port No. 2 of the differential relay valve 5, and port 42 is connected to the air outlet of the EBS brake valve. When the parking brake is carried out, the air outlet is communicated with the exhaust port. When the parking brake is released, the No. 1 control port enters gas, so that the gas inlet is opened, the gas inlet is communicated with the gas outlet, and the parking brake gas storage cylinder 2 enters the cavity B of the spring energy storage gas chamber 4. The differential relay valve 5 can also prevent the simultaneous occurrence of service braking and parking braking, when the service braking and the parking braking occur simultaneously, the air is fed into the No. 2 control port, the air is not fed into the No. 1 control port, and the air inlet is communicated with the air outlet due to the common control of the two control ports, so that the simultaneous occurrence of the two types of braking is avoided.

Optionally, the structure of the EBS rear axle module 3 is as shown in fig. 4, the

ports

11 and 12 of the EBS rear axle module 3 are air inlets, the

ports

11 and 12 are both connected to the rear brake air cylinder 1 through a pipeline, the

ports

21 and 22 of the EBS rear axle module 3 are air outlets, the

ports

21 and 22 are respectively connected to the cavities a of the two air chambers of the spring energy storage air chamber 4 through pipelines, the

ports

31 and 32 are air outlets, and the port 4 is a control port. When the vehicle is braked, the air is fed from the control port, so that the air inlet is communicated with the air outlet, and the air enters the cavity A of the spring energy storage air chamber 4 from the rear braking air cylinder 1; when the service brake is released, the air outlet is communicated with the air outlet.

Alternatively, the structure of one of the spring energy storage air chambers 4 is shown in fig. 5, the spring energy storage air chamber 4 is a symmetrical structure of two air chambers as shown in the spring air chamber in fig. 1, fig. 5 only shows one of the air chambers, and the other air chamber is similar to the structure shown in fig. 5. In fig. 5, B is a push rod, c is a conical spring, d is a diaphragm, e is a large piston, f is a spring, the cavity a is connected with the air outlet of the EBS rear axle module 3 through a pipeline through a port 11, and the cavity B is connected with the air outlet of the differential relay valve 5 through a port 12.

The working process of the spring energy storage air chamber 4 is as follows:

when the vehicle brake is carried out, compressed gas enters the cavity A from the opening 11, the pressure intensity in the cavity A is increased, the gas pushes the diaphragm d to move rightwards, the push rod b is driven to move rightwards, and the compression conical spring c moves rightwards to act on the brake arm to generate a brake effect;

when the service brake is released, the gas in the cavity A is discharged from the port 11, the pressure in the cavity A is reduced, the diaphragm d moves leftwards to drive the push rod b to move leftwards, the conical spring c gradually recovers from a compressed state and moves leftwards, and the braking action is released;

when parking braking occurs, gas in the cavity B is discharged from the 12 port, the pressure intensity in the cavity B is reduced, the large piston e moves rightwards, the spring f moves rightwards, and the push rod B moves rightwards under the action of the conical spring c to generate braking action;

when the parking and parking brake is released, air enters the cavity B from the opening 12, the pressure in the cavity B is increased, the air pushes the large piston e to the left, the compression spring f moves to the left, the push rod B moves to the left under the action of the conical spring c, and the braking action is released.

Optionally, the EBS brake valve 7 is further electrically connected to the EBS rear axle module 3, and the EBS brake valve 7 controls the opening degree of the control port of the EBS rear axle module 3 according to the brake pedal signal. It should be noted that the opening degree of the control port determines the speed of service braking, and the larger the opening degree of the control port is, the faster the service braking is.

Optionally, when the vehicle is braked, the EBS brake valve 7 receives a brake signal of a brake pedal, an air outlet of the EBS brake valve 7 is communicated with the control port of the EBS rear axle module 3, an air outlet of the EBS brake valve 7 transmits air to the control port of the EBS rear axle module 3 to control the air inlet and the air outlet of the EBS rear axle module 3 to be communicated, and the air in the rear brake air cylinder 1 enters the cavity a of the spring air cylinder 4 to generate a braking action;

when the service brake is released, the EBS brake valve 7 receives a brake release signal of a brake pedal, the gas outlet of the EBS brake valve 7 is not communicated with the control port of the EBS rear axle module 3, the gas outlet of the EBS brake valve 7 does not convey gas to the control port of the EBS rear axle module 3, the gas outlet of the EBS rear axle module 3 is controlled to be communicated with the gas outlet, and the gas in the cavity A of the spring gas storage chamber 4 is exhausted to the atmosphere through the gas outlet of the EBS rear axle module 3 to release the brake function.

Optionally, when parking braking is performed, the electronic parking switch 9 receives a parking braking signal and sends the parking braking signal to the electronic parking electronic control unit 8, the electronic parking electronic control unit 8 sends an electric signal to the parking coil of the two-wire two-position three-way electromagnetic valve 6, so that the air outlet and the air outlet of the two-wire two-position three-way electromagnetic valve 6 are communicated, the air outlet of the two-wire two-position three-way electromagnetic valve 6 cannot convey air to the control port No. 1 of the differential relay valve 5, so that the air outlet and the air outlet of the differential relay valve 5 are communicated, and air in the cavity B of the spring air storage chamber 4 is exhausted into the atmosphere through the air outlet of the differential relay valve 5 and/or the air outlet of the two-;

when the parking brake is released, the electronic parking switch 9 receives a parking brake signal and sends the parking brake release signal to the electronic parking control unit 8, the electronic parking control unit 8 sends an electric signal to the parking coil of the two-wire two-position three-way electromagnetic valve 6, so that the air inlet and the air outlet of the two-wire two-position three-way electromagnetic valve 6 are communicated, the air outlet of the two-wire two-position three-way electromagnetic valve 6 conveys air to the No. 1 control port of the differential relay valve 5, so that the air inlet and the air outlet of the differential relay valve 5 are communicated, and the air in the parking brake air storage cylinder 2 enters the cavity B of the spring air storage chamber 4 to release.

Optionally, the electronic parking electronic control unit 8 obtains a service braking instruction, and reads a current vehicle speed and a current wheel speed through the vehicle communication network 10 at a first time after obtaining the service braking instruction, the electronic parking electronic control unit 8 judges whether the current vehicle speed is greater than a theoretical vehicle speed corresponding to the current wheel speed and a difference between the current vehicle speed and the theoretical vehicle speed is greater than a preset difference, if so, the electronic parking electronic control unit 8 starts anti-lock braking;

it should be noted that the reason why the EBS electronic control unit 11 first acts is that the electronic parking electronic control unit 8 reads the vehicle speed and the wheel speed at the first time after obtaining the brake command. After the EBS ecu 11 is activated, the electronic parking ecu 8 reads the vehicle speed and the wheel speed to prevent the electronic parking ecu 8 and the EBS ecu 11 from performing anti-lock braking simultaneously. Whether the EBS can not normally perform the anti-lock braking can also be judged, and the EPB can perform the anti-lock braking when the EBS can not perform the anti-lock braking.

Specifically, besides the first moment, the present invention may also obtain the current vehicle speed and the current wheel speed at other moments after obtaining the service braking instruction, and determine whether to start the anti-lock braking according to the current vehicle speed and the current wheel speed. The interval of each time may be a fixed interval. Thus, after obtaining the braking command, the invention periodically obtains the vehicle speed and the wheel speed, and judges whether anti-lock braking is needed or not for many times.

The electronic parking electronic control unit 8 is specifically configured to: the electronic parking electronic control unit 8 sends an electric signal to a parking coil of the double-wire two-position three-way electromagnetic valve 6, so that an air inlet and an air outlet of the double-wire two-position three-way electromagnetic valve 6 are communicated, the air outlet of the double-wire two-position three-way electromagnetic valve 6 conveys air to a No. 1 control port of the differential relay valve 5, so that the air inlet and the air outlet of the differential relay valve 5 are communicated, and the air in the parking braking air storage cylinder 2 enters a cavity B of the spring air storage chamber 4 to reduce braking force; the electronic parking electronic control unit 8 sends an electric signal to the parking coil of the double-wire two-position three-way electromagnetic valve 6, so that the gas outlet and the gas outlet of the double-wire two-position three-way electromagnetic valve 6 are communicated, the gas outlet of the double-wire two-position three-way electromagnetic valve 6 cannot convey gas to the No. 1 control port of the differential relay valve 5, the gas outlet and the gas outlet of the differential relay valve 5 are communicated, and gas in the cavity B of the spring gas storage chamber 4 is exhausted into the atmosphere through the gas outlet of the differential relay valve 5 and/or the gas outlet of the double-wire two-position three-way.

It should be noted that, when the driver presses the brake, the electronic parking electronic control unit 8 reads the vehicle speed and the wheel speed, and determines whether the service braking of the EBS is failed or the service braking effect of the EBS is deteriorated due to other situations according to whether the vehicle speed and the wheel speed are matched. If the vehicle speed and the wheel speed are not matched, the EBS electronic control unit 11 is in failure or the service braking effect of the EBS is poor due to other conditions, the anti-lock function can be started, when the EBS can not brake, the EPB is used for braking, the matched braking of the EPB and the EBS is realized, and the EPB in the prior art can not be realized by an independent system.

Optionally, the electronic parking electronic control unit 8 reads the pressure in the rear brake air reservoir 1 through the vehicle communication network 10, determines whether the pressure is smaller than a first pressure threshold, and if so, the electronic parking electronic control unit 8 starts anti-lock braking;

It should be noted that the electronic parking control unit 8 determines whether the pressure in the rear brake air cylinder 1 is sufficient to support the service brake by reading the pressure in the rear brake air cylinder 1, and starts the anti-lock function if the pressure is not sufficient to support the service brake. The existing EPB system also cannot read the pressure in the rear brake air reservoir 1.

Optionally, the system provided in the embodiment of the present invention may be implemented to include: emergency braking, temporary parking, starting release, hill starting and the like.

In emergency braking, when the electronic parking switch 9 is pressed and the vehicle speed is greater than a first threshold value, the EBS electronic control unit 11 performs service braking;

when the electronic parking switch 9 is pressed and the vehicle speed is not greater than the first threshold value, the electronic parking control unit 8 performs parking braking.

When the vehicle needs to be parked frequently for a short time, the driver presses the auto parking key signal, and the determination process shown in fig. 6 needs to be performed to determine whether to activate the service brake, including:

step S101: the EBS electronic control unit 11 obtains an automatic parking key signal;

step S102: the EBS electronic control unit 11 determines whether the vehicle speed is equal to 0, and if so, performs step S103 and step S104 simultaneously, otherwise, repeats step S102.

Step S103: the EBS electronic control unit 11 determines whether the door is open, and if so, proceeds to step S105, otherwise, returns to step S102.

Step S104: the EBS electronic control unit 11 determines whether the time for stepping on the brake pedal is longer than 3 seconds, and if so, it proceeds to step S105, otherwise, it returns to step S102.

Step S105: the EBS electronic control unit 11 activates the service brakes.

And judging whether the temporary parking starts service braking or not through the process.

The steps in fig. 6 are all performed by the system provided by the embodiment of the present invention, and the EPB parking brake or the EBS service brake is performed according to the actual situation, so that the EPB and the EBS are matched with each other. The service braking and the parking braking in the process are the same as the service braking and the parking braking, and the description is omitted here.

When the vehicle starts to release, and when a driver presses an automatic parking button, the system provided by the embodiment of the invention detects an accelerator signal, the electronic parking electronic control unit 8 sends a command to the EBS rear axle module 3, so that the service brake is released, and the releasing process is the same as the service brake releasing process, and is not described again.

When starting on a hill, the system provided by the embodiment of the invention compares the driving force of the engine with the sliding force of the whole vehicle, and when the driving force is greater than the sliding force, the electronic parking electronic control unit 8 sends a command to the EBS rear axle module 3 to release the service brake and enable the vehicle to start smoothly, and the release process is the same as the service brake release process, and is not repeated herein.

The embodiment of the invention discloses an electronic parking system, which comprises: the brake system comprises a rear brake air cylinder 1, a parking brake air cylinder 2, an EBS rear axle module 3, a spring energy storage air chamber 4, a differential relay valve 5, a two-wire two-position three-way electromagnetic valve 6, an EBS brake valve 7, an electronic parking electronic control unit 8, an electronic parking switch 9, a whole vehicle communication network 10 and an EBS electronic control unit 11, wherein the rear brake air cylinder 1 is connected with an air inlet of the EBS brake valve 7 through a pipeline, an air outlet of the EBS brake valve 7 is connected with a control port 2 of the EBS rear axle module 3 through a pipeline, an air outlet of the EBS brake valve 7 is also connected with a control port 2 of the differential relay valve 5 through a pipeline, the rear brake air cylinder 1 is connected with an air inlet of the EBS rear axle module 3 through a pipeline, and an air outlet of the EBS rear axle module 3 is connected with a cavity A of; the parking braking air cylinder 2 is connected with an air inlet of the double-wire two-position three-way electromagnetic valve 6 through a pipeline, an air outlet of the double-wire two-position three-way electromagnetic valve 6 is connected with a No. 1 control port of the differential relay valve 5 through a pipeline, an air inlet of the differential relay valve 5 is connected with the parking braking air cylinder 2 through a pipeline, an air outlet of the differential relay valve 5 is connected with a cavity B of the spring energy storage air chamber 4 through a pipeline, and the electronic parking electronic control unit 8 is respectively electrically connected with a release coil and a parking coil of the double-wire two-position three; the electronic parking switch 9 is electrically connected with the electronic parking electronic control unit 8, the whole vehicle communication network 10 is electrically connected with the electronic parking electronic control unit 8, and the EBS electronic control unit 11 is electrically connected with the whole vehicle communication network 10. According to the invention, the EPB is accessed into the whole vehicle communication network 10, so that the combination of the EPB and the EBS is realized, and the EPB and the EBS can be mutually matched for braking.

Based on the electronic parking system disclosed above, the embodiment of the invention also discloses an electronic parking method, which is applied to the electronic parking system, and the method comprises the following steps:

when the automobile is braked, the EBS brake valve 7 receives a brake signal of a brake pedal, the air outlet of the EBS brake valve 7 is communicated with the control port of the EBS rear axle module 3, the air outlet of the EBS brake valve 7 transmits air to the control port of the EBS rear axle module 3 to control the air inlet and the air outlet of the EBS rear axle module 3 to be communicated, and the air in the rear brake air storage cylinder 1 enters the cavity A of the spring air storage chamber 4 to generate a braking action;

when the service brake is released, the EBS brake valve 7 receives a brake release signal of a brake pedal, the gas outlet of the EBS brake valve 7 is not communicated with the control port of the EBS rear axle module 3, the gas outlet of the EBS brake valve 7 does not convey gas to the control port of the EBS rear axle module 3, the gas outlet and the gas outlet of the EBS rear axle module 3 are controlled to be communicated, and the gas in the cavity A of the spring gas storage chamber 4 is exhausted to the atmosphere through the gas outlet of the EBS rear axle module 3 to release the brake function;

when parking braking is carried out, the electronic parking switch 9 receives a parking braking signal and sends the parking braking signal to the electronic parking electronic control unit 8, the electronic parking electronic control unit 8 sends an electric signal to a parking coil of the two-wire two-position three-way electromagnetic valve 6, so that the air outlet and the air outlet of the two-wire two-position three-way electromagnetic valve 6 are communicated, the air outlet of the two-wire two-position three-way electromagnetic valve 6 cannot convey air to the No. 1 control port of the differential relay valve 5, the air outlet and the air outlet of the differential relay valve 5 are communicated, and air in the cavity B of the spring air storage chamber 4 is exhausted to the atmosphere through the air outlet of the differential relay valve 5 and/or the air outlet of the two-wire;

the EBS brake valve 7 controls the opening degree of a control port of the EBS rear axle module 3 according to the brake pedal signal.

Optionally, the method further comprises:

the electronic parking electronic control unit 8 obtains a service braking instruction, reads the current vehicle speed and the current wheel speed through the whole vehicle communication network 10 at the first moment after the service braking instruction is obtained, the electronic parking electronic control unit 8 judges whether the current vehicle speed is greater than the theoretical vehicle speed corresponding to the current wheel speed or not and the difference between the current vehicle speed and the theoretical vehicle speed is greater than a preset difference, and if so, the electronic parking electronic control unit 8 starts anti-lock braking;

Optionally, the method further comprises:

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments. In particular, for the system embodiment, since it is substantially similar to the method embodiment, the description is simple, and for the relevant points, reference may be made to the partial description of the method embodiment.

The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention shall fall within the protection scope of the present invention.

Claims

1. An electronic parking system, characterized in that the system comprises: a rear braking air reservoir (1), a parking braking air reservoir (2), an EBS rear axle module (3), a spring energy storage air chamber (4), a differential relay valve (5), a two-wire two-position three-way electromagnetic valve (6), an EBS braking valve (7), an electronic parking electronic control unit (8), an electronic parking switch (9), a whole vehicle communication network (10) and an EBS electronic control unit (11),

the rear brake air cylinder (1) is connected with an air inlet of the EBS brake valve (7) through a pipeline, an air outlet of the EBS brake valve (7) is connected with a control port of the EBS rear axle module (3) through a pipeline, an air outlet of the EBS brake valve (7) is also connected with a No. 2 control port of the differential relay valve (5) through a pipeline, the rear brake air cylinder (1) is connected with an air inlet of the EBS rear axle module (3) through a pipeline, and an air outlet of the EBS rear axle module (3) is connected with a cavity A of the spring energy storage air chamber (4) through a pipeline;

the parking braking air reservoir (2) is connected with an air inlet of the two-wire two-position three-way electromagnetic valve (6) through a pipeline, an air outlet of the two-wire two-position three-way electromagnetic valve (6) is connected with a No. 1 control port of the differential relay valve (5) through a pipeline, an air inlet of the differential relay valve (5) is connected with the parking braking air reservoir (2) through a pipeline, an air outlet of the differential relay valve (5) is connected with a cavity B of the spring energy storage air chamber (4) through a pipeline, and the electronic parking electronic control unit (8) is respectively electrically connected with a release coil and a parking coil of the two-wire two-position three-way electromagnetic valve (6);

the electronic parking switch (9) is electrically connected with the electronic parking electronic control unit (8), the whole vehicle communication network (10) is electrically connected with the electronic parking electronic control unit (8), and the EBS electronic control unit (11) is electrically connected with the whole vehicle communication network (10).

2. The system according to claim 1, wherein the EBS brake valve (7) is further electrically connected to the EBS rear axle module (3), the EBS brake valve (7) controlling the degree of opening of a control port of the EBS rear axle module (3) in response to a brake pedal signal.

3. The system of claim 1,

when the automobile is braked, the EBS brake valve (7) receives a brake signal of a brake pedal, an air outlet of the EBS brake valve (7) is communicated with a control port of the EBS rear axle module (3), air is conveyed to the control port of the EBS rear axle module (3) from the air outlet of the EBS brake valve (7) to control the air inlet and the air outlet of the EBS rear axle module (3) to be communicated, and air in the rear brake air storage cylinder (1) enters the cavity A of the spring air storage chamber (4) to generate a braking effect;

when the service brake is released, the EBS brake valve (7) receives a brake release signal of a brake pedal, the gas outlet of the EBS brake valve (7) is not communicated with the control port of the EBS rear axle module (3), the gas outlet of the EBS brake valve (7) does not convey gas to the control port of the EBS rear axle module (3) to control the gas outlet and the gas outlet of the EBS rear axle module (3) to be communicated, and gas in the cavity A of the spring gas storage chamber (4) is exhausted to the atmosphere through the gas outlet of the EBS rear axle module (3) to release the brake function.

4. The system of claim 1,

when the parking brake is performed, the electronic parking switch (9) receives a parking brake signal and sends the parking brake signal to the electronic parking control unit (8), the electronic parking electronic control unit (8) sends an electric signal to a parking coil of the double-wire two-position three-way electromagnetic valve (6) to lead an air outlet and an air outlet of the double-wire two-position three-way electromagnetic valve (6) to be communicated, the gas outlet of the double-wire two-position three-way electromagnetic valve (6) can not convey gas to the No. 1 control port of the differential relay valve (5), so that the gas outlet of the differential relay valve (5) is communicated with the gas outlet, the gas in the cavity B of the spring gas storage chamber (4) is exhausted to the atmosphere through an exhaust port of the differential relay valve (5) and/or an exhaust port of the double-line two-position three-way electromagnetic valve (6) to generate a braking effect;

when parking brake is released, the electronic parking switch (9) receives a parking brake signal and sends the parking brake release signal to the electronic parking electronic control unit (8), the electronic parking electronic control unit (8) sends an electric signal to the parking coil of the two-wire two-position three-way electromagnetic valve (6), so that the air inlet and the air outlet of the two-wire two-position three-way electromagnetic valve (6) are communicated, the air outlet of the two-wire two-position three-way electromagnetic valve (6) is used for conveying gas to the No. 1 control port of the differential relay valve (5), so that the air inlet and the air outlet of the differential relay valve (5) are communicated, and the gas in the parking brake air storage cylinder (2) enters the B cavity of the spring air storage chamber (4) to release the brake function.

5. The system according to claim 1, wherein the electronic parking electronic control unit (8) obtains a service brake command, and reads a current vehicle speed and a current wheel speed through a vehicle communication network (10) at a first moment after obtaining the service brake command, the electronic parking electronic control unit (8) judges whether the current vehicle speed is greater than a theoretical vehicle speed corresponding to the current wheel speed and a difference between the current vehicle speed and the theoretical vehicle speed is greater than a preset difference, and if so, the electronic parking electronic control unit (8) starts anti-lock braking;

the electronic parking electronic control unit (8) is specifically configured to: the electronic parking electronic control unit (8) sends an electric signal to a parking coil of the double-wire two-position three-way electromagnetic valve (6) to enable an air inlet and an air outlet of the double-wire two-position three-way electromagnetic valve (6) to be communicated, the air outlet of the double-wire two-position three-way electromagnetic valve (6) conveys air to a No. 1 control port of the differential relay valve (5) to enable the air inlet and the air outlet of the differential relay valve (5) to be communicated, and the air in the parking braking air cylinder (2) enters a cavity B of the spring air storage chamber (4) to reduce braking force; electronic parking electronic control unit (8) send the signal of telecommunication extremely the parking coil of two three solenoid valve (6) of double-wire makes the gas outlet and the gas vent of two three solenoid valve (6) of double-wire switch on, the gas outlet of two three solenoid valve (6) of double-wire can not carry gas extremely 1 number control mouth of differential relay valve (5), makes the gas outlet and the gas vent of differential relay valve (5) switch on, the gas in the B chamber of spring gas receiver (4) passes through the gas vent of differential relay valve (5) and/or the gas vent of two three solenoid valve (6) of double-wire is arranged in the atmosphere to improve braking force.

6. The system according to claim 1, characterized in that the electronic parking electronic control unit (8) reads the pressure in the rear brake air reservoir (1) through the vehicle communication network (10), determines whether said pressure is determined to be less than a first pressure threshold value, and if so, the electronic parking electronic control unit (8) activates the anti-lock brake;

7. An electronic parking method applied to the electronic parking system according to any one of claims 1 to 6, the method comprising:

when the service brake is released, the EBS brake valve (7) receives a brake release signal of a brake pedal, the air outlet of the EBS brake valve (7) is not communicated with the control port of the EBS rear axle module (3), the air outlet of the EBS brake valve (7) does not convey air to the control port of the EBS rear axle module (3) to control the air outlet and the exhaust port of the EBS rear axle module (3) to be communicated, and the air in the cavity A of the spring air storage chamber (4) is exhausted to the atmosphere through the exhaust port of the EBS rear axle module (3) to release the brake function;

8. The method of claim 7, wherein the EBS brake valve (7) is further electrically connected with the EBS rear axle module (3), the method further comprising:

and the EBS brake valve (7) controls the opening degree of a control port of the EBS rear axle module (3) according to the brake pedal signal.

9. The method of claim 7, further comprising:

the electronic parking electronic control unit (8) obtains a service braking instruction, reads the current vehicle speed and the current wheel speed through a whole vehicle communication network (10) at the first moment after the service braking instruction is obtained, judges whether the current vehicle speed is greater than the theoretical vehicle speed corresponding to the current wheel speed or not and the difference between the current vehicle speed and the theoretical vehicle speed is greater than a preset difference, and if so, the electronic parking electronic control unit (8) starts anti-lock braking;

10. The method of claim 7, further comprising:

the electronic parking electronic control unit (8) reads the pressure in the rear brake air cylinder (1) through a whole vehicle communication network (10), determines whether the pressure is smaller than a first pressure threshold value, and if so, the electronic parking electronic control unit (8) starts anti-lock braking;