CN112046451A

CN112046451A - Brake-by-wire system and vehicle comprising same

Info

Publication number: CN112046451A
Application number: CN202010831430.3A
Authority: CN
Inventors: 帕拉尼萨米·巴尔拉杰; 拉杰什·拉仁德兰; 王川; 盛杰; 张克谦; 乔君辉; 赵辉; 王佶; 王瑞华
Original assignee: Exquisite Automotive Systems Co Ltd
Current assignee: Exquisite Automotive Systems Co Ltd
Priority date: 2020-08-18
Filing date: 2020-08-18
Publication date: 2020-12-08

Abstract

The invention relates to the field of automobile control, and provides a brake-by-wire system in an implementation mode, which comprises the following working states: a standby state, an active hold state, a timeout state, and a release state, the electronic control unit of the brake-by-wire system being configured to: and determining the working state of the brake-by-wire system according to vehicle state information and preset triggering conditions, wherein the vehicle state information at least comprises the on-position state information of a driver. The electric automobile comprising the brake-by-wire system is also provided. The embodiment of the invention can effectively reduce or avoid accidents caused by that the driver does not effectively brake when leaving the vehicle.

Description

Brake-by-wire system and vehicle comprising same

Technical Field

The invention relates to the field of automobile control, in particular to a brake-by-wire system and a vehicle comprising the same.

Background

The auto-hold function is a basic configuration for high end vehicle models. The driver may use a switch to enable and disable this function. When this automatic hold function is enabled, it can check the following conditions to hold the brake fluid pressure and thus the vehicle state: activating an automatic hold by a switch; the vehicle is stationary; the vehicle is in any gear; driver in vehicle (seat belt fastened, and door closed); EPB unclamped

The automatic hold should be released if any of the following conditions are met: 1. automatic hold by switch deactivation; 2. using an accelerator pedal; 3. the driver is leaving the car (seat belt unfastened, driver position door open); 4. opening an engine cover or opening a trunk door; 5. engaging a P gear; 6. using EPB; 7. the vehicle stopped state exceeds a certain value (5 or 10 min); 8. the vehicle stops on a steep incline.

In the prior art, the brake is always applied even when the driver does not step on the brake or the accelerator pedal. It will disable the vehicle from traveling in the D-range idle state. This patent requires the driver to propel the vehicle via an accelerator pedal. In this case, discomfort may be given to the driver. In many of the foregoing situations, driver distraction may result from forgetting to activate the EPB or engaging in a P-range before leaving the vehicle, such as making a phone call, watching a video or file on a cell phone, or the like. Meanwhile, when a driver is in emergency, the driver may forget to start the EPB or engage in the P range, for example, when a fire occurs inside or outside the vehicle, or an accident occurs in the driver or others, the driver wants to help others quickly. Current iboorsters do not consider the condition for driver departure. Therefore, when the vehicle is on a slope or is in a D gear, the vehicle can move forwards, and collision is likely to be caused, so that accidents are caused.

CAN is controller area network; ECU, electronic control unit; ESP electronic stabilization unit; VCU vehicle control unit; ETRS, selecting the range of the electronic gearbox; EPB, electronic parking brake; PTS is pedal stroke sensor; DTS is a differential travel sensor; RPS is a rotation angle position sensor.

Disclosure of Invention

In view of the above, the present invention is directed to a brake-by-wire system and a vehicle including the same, so as to at least partially solve the above problems.

In a first aspect of the present invention, a brake-by-wire system is provided, comprising the following operating states: a standby state, an active hold state, a timeout state, and a release state, the brake-by-wire system configured to: and determining the working state of the brake-by-wire system according to vehicle state information and preset triggering conditions, wherein the vehicle state information at least comprises the on-position state information of a driver.

Preferably, the presence status information is determined based on at least one of the following statuses: the opening and closing state of the vehicle door on the driver side; a driver seat belt state; the gravity sensing state of the driver seat; the operated state of the driving operation member.

Preferably, the vehicle state information and the preset trigger condition for the operating state of the brake-by-wire system to transition from the standby state to the active hold state include: all of the following conditions are satisfied: the vehicle speed is 0, and the vehicle speed is valid; the gear is not P gear, and the gear is effective; brake pedal released and PTS active; the brake-by-wire system is in a boost mode; the accelerator pedal is not used and a valid signal is received from the VCU; the driver is in-position information is valid, and the state is 'out-of-position'; the EPB is not clamped and the EPB state is valid.

Preferably, the vehicle state information and the preset trigger condition for the transition of the operating state of the brake-by-wire system from the active hold state to the timeout state include: all of the following conditions are satisfied: exceeding the active brake hold time; the driver is in-position information is valid, and the state is 'out-of-position'; the gear is switched to a P gear; the EPB is clamped.

Preferably, the vehicle state information and the preset trigger condition for the operating state of the brake-by-wire system to transition from the active hold state to the release state include: any one of the following conditions is satisfied: the driver is in-position information is valid, and the state is 'in-position'; establishing braking; the accelerator pedal state changes.

Preferably, the transition target operating states of the time-out state and the release state of the brake-by-wire system include a standby state.

Preferably, the operating state of the brake-by-wire system further includes an error state, and the brake-by-wire system is shifted to the error state when any one of the following conditions is satisfied: the pedal travel state and the corner position state of the brake-by-wire system are valid; the driver on-site information is invalid; the throttle state is invalid; the gear state is invalid; the EPB state is invalid.

Preferably, the vehicle state information and the preset trigger condition for the operating state of the brake-by-wire system to transition from the error state to the standby state include: the pedal travel state and the corner position state of the brake-by-wire system are valid; the on-site information of the driver is valid; the accelerator pedal state is valid; the gear state is effective; the EPB state is valid.

Preferably, the working state of the brake-by-wire system further includes an initial state, and the initial state includes checking a function enabling state of the brake-by-wire system and initializing all module variables, and after completion, the system is shifted to the standby state.

Preferably, the brake-by-wire system is configured to: and generating a signal for turning off the engine of the vehicle under the condition that the duration of the on-position state information of the driver is determined to be valid and the state is 'off-position' exceeds a set duration threshold and the current gear of the vehicle is D or R gear.

In a second aspect of the invention, there is also provided a vehicle comprising the brake-by-wire system described above.

Through the technical scheme provided by the invention, the following beneficial effects are achieved:

if the driver leaves the vehicle without engaging the park or gripping the EPB, the vehicle will be in a parked/stationary state. This method will prevent collisions with objects in front of or behind the vehicle if the engine torque or grade is sufficient to move the vehicle forward or backward. And when the driver leaves the vehicle for a long time, and on the premise of ensuring safety, the engine can be shut down through the VCU, so that the technical effect of saving fuel is realized.

Additional features and advantages of the invention will be set forth in the detailed description which follows.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 is a schematic diagram illustrating the transition of the operating state of a brake-by-wire system according to an embodiment of the present invention;

FIG. 2 is a schematic parameter acquisition diagram of a brake-by-wire system provided in accordance with another embodiment of the present invention;

fig. 3 is a schematic diagram illustrating the transition of the operating state of the brake-by-wire system according to another embodiment of the present invention.

Detailed Description

In addition, the embodiments of the present invention and the features of the embodiments may be combined with each other without conflict.

The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.

Example one

Fig. 1 is a schematic diagram illustrating a transition of an operating state of a brake-by-wire system according to an embodiment of the present invention, as shown in fig. 1. A brake-by-wire system, comprising the following operating states: a standby state, an active hold state, a timeout state, and a release state, the brake-by-wire system configured to: and determining a working state according to the vehicle state information and a preset trigger condition, wherein the vehicle state information at least comprises the on-position state information of a driver.

In this way, the monitoring of the on-position state information of the driver is added in the brake-by-wire system, and the control logic of the brake-by-wire system is constructed based on the on-position state information, so that accidents caused by the fact that the driver does not effectively brake when leaving the vehicle are reduced or avoided.

Specifically, the following description will be given using iBooster as an embodiment of the brake-by-wire system. Fig. 2 is a schematic diagram of parameter acquisition of a brake-by-wire system according to another embodiment of the present invention, and as shown in fig. 2, an existing iBooster system is summarized as follows: the iBooster receives brake pedal information from a PTS/DTS sensor; the iBooster interacts with the ESP and the ECU to acquire vehicle speed information and EPB state information; receiving accelerator pedal position and torque status from the VCU and ECU; receiving a driver seat belt and driver door status from the BCM and the ECU; actual gear information of the vehicle is received from the transmission ECU. The iBooster checks the smart brake activation condition and applies brake pressure on the wheels to maintain the vehicle in a stationary/stationary state. The iBooster, specifically the Electronic Control Unit (ECU) in the iBooster, through obtaining above-mentioned vehicle state information, through predetermineeing trigger condition, obtain the operating condition of drive-by-wire braking system, this operating condition includes aforementioned standby state, initiative hold state, overtime-out state and release state to move at above operating condition, realize the preset automatic braking function of iBooster with this, accomplish the intellectuality of braking.

Wherein the presence state information of the driver is determined based on at least one of the following states: the opening and closing state of the vehicle door on the driver side; the driver's seat belt status; the gravity sensing state of the driver seat; the operated state of the driving operation member. The above state information is detected by corresponding sensors in the existing vehicle, so that the vehicle does not need to be improved. When two or more of the above-mentioned methods are adopted to make combined detection, more accurate in-situ state information can be obtained.

The above-described operating states and transitions between operating states are described in detail below.

Standby state: in this state, the iBooster will not build brake pressure and the iBooster will monitor the signal and wait for a trigger condition.

An active hold state: in the active hold state, pressure is actively/autonomously established by the iBooster, which will remain for a predetermined period of time (5 minutes) after the pressure reaches a desired level to hold the vehicle, and will switch to a timeout state after a predefined time has elapsed.

A timeout state: during the timeout state, the iBooster will send an EPB request, wait for the EPB to clamp successfully, and after the EPB clamps, gradually reduce the pressure to zero, requesting the ETRS to switch to P range. This applies only to vehicles equipped with electronic transmission shifting.

And (3) releasing state: in this state, when the driver depresses the accelerator pedal, the pressure is fully released, and if the brake pedal is depressed, the iBooster will convert to a brake pressure in response to the driver request, optionally with a sound being emitted during the brake pressure release.

The preset transition triggering conditions between the working states are as follows:

the preset trigger condition for the standby state to be transferred to the active holding state comprises the following steps: all of the following conditions must be met: vehicle speed is 0 and vehicle speed is active, gear is not P (D, R or N) and gear is active, brake pedal is released and PTS is active, iBooster is in boost mode, accelerator pedal is not used and a valid signal is received from VCU, driver is not present or trying to leave vehicle (using the aforementioned state identification to identify this state) and the signal state is active, EPB is not clamped and EPB state is active.

The preset trigger condition for the active hold state to transition to the timeout state includes: all of the following conditions must be met: beyond the active brake hold time, the driver does not return to the vehicle (this state can be identified using the state identification described above), the gear is switched to P-range, and EPB is clamped.

The preset trigger condition for the active holding state to be transferred to the release state comprises the following steps: any one of the following conditions must be satisfied: the driver brakes, the driver steps on an accelerator pedal, and whether the driver returns is identified through a safety belt signal.

The preset trigger condition for the transition from the overtime state to the standby state comprises the following steps: all of the following conditions must be met: the pressure is completely released by the iBooster, and the gear is switched to the P gear and is effective.

The preset trigger condition for the release state to be transferred to the standby state comprises the following steps: automatic braking completely eliminates brake pressure.

Example two

On the basis of the operating state in the previous embodiment, an initial state and an error state are included, the initial state is used for initializing the iBooster, and the error state is used for processing when the iBooster is invalid for an external state signal

An initialization state: during initialization, the iBooster checks the iBooster function enable state and initializes all module variables.

Error state: in this state, the pressure is completely released. Alternatively, a sound may be emitted during the brake pressure release, waiting for the error to recover.

Fig. 3 is a schematic diagram illustrating the transition of the operating state of the brake-by-wire system according to another embodiment of the present invention, as shown in fig. 3. The preset transition triggering conditions between the working states are as follows:

the preset trigger condition for the active hold state to transition to the timeout state includes: at the end of initialization, the iBooster transitions from the initial state to the standby state.

The preset trigger condition for the transition from any other working state to the error state includes: any one of the following conditions must be satisfied: the driver state related signal is invalid, the iBooster state is valid (PTS and RPS states), the accelerator state is invalid, the gear state is invalid, and the EPB state is invalid

The preset trigger condition for the transition from the error state to the standby state comprises the following steps: all of the following conditions must be met: the driver's current information is valid (door state and seat belt state), the iBooster state is valid (displacement sensor, corner sensor), the accelerator pedal state is valid, the gear state is valid, the EPB state is valid.

Through the increased working state, the initialization and exception handling of the brake-by-wire system can be realized, and the robustness of the system is increased.

EXAMPLE III

The embodiment also provides a vehicle comprising the brake-by-wire system, namely the vehicle adopts the iBooster to perform brake-by-wire. The vehicle comprising the brake-by-wire system has the advantage of being capable of monitoring the presence information of a driver.

Optionally, a signal for turning off the engine of the vehicle is generated when it is determined that the duration of the presence state information of the driver is valid and the state is "not in place" exceeds a set duration threshold and the current gear of the vehicle is a D or R gear. Specifically, if the vehicle is in D or R range, and the driver leaves the vehicle, fuel is consumed, including: gasoline, diesel, battery, Gar, or other types. The iBooster in this embodiment communicates with the VCU to reduce the torque of the engine and the driver will automatically command the VCU to shut down the engine without returning for a long period of time. This embodiment will therefore save fuel.

The embodiment of the invention provides a brake-by-wire logic and system for detecting the presence information of a driver, aiming at the problem of absence of detection of the presence of the driver in the existing brake-by-wire system. The embodiments provided by the invention are applied to the braking of a vehicle, in particular to a brake-by-wire system.

As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.

The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.

These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.

Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.

It should also be noted that 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 the process, method, article, or apparatus that comprises the element.

The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A brake-by-wire system, characterized in that the brake-by-wire system comprises the following operating states: a standby state, an active hold state, a timeout state, and a release state, the brake-by-wire system configured to: and determining the working state of the brake-by-wire system according to vehicle state information and preset triggering conditions, wherein the vehicle state information at least comprises the on-position state information of a driver.

2. The brake-by-wire system according to claim 1, wherein the on-position state information of the driver is determined based on at least one of the following states:

the opening and closing state of the vehicle door on the driver side;

the driver's seat belt status;

the gravity sensing state of the driver seat;

the operated state of the driving operation member.

3. The brake-by-wire system according to claim 1, wherein the vehicle state information and preset trigger conditions for the transition of the operating state of the brake-by-wire system from the standby state to the active hold state include: all of the following conditions are satisfied:

the vehicle speed is 0, and the vehicle speed is valid;

the gear is not P gear, and the gear is effective;

brake pedal released and PTS active;

the brake-by-wire system is in a boost mode;

the accelerator pedal is not used and a valid signal is received from the VCU;

the in-place state information of the driver is valid, and the state is 'out-of-place';

the EPB is not clamped and the EPB state is valid.

4. The brake-by-wire system according to claim 1, wherein the vehicle state information and the preset trigger condition for the transition of the operating state of the brake-by-wire system from the active hold state to the timeout state include: all of the following conditions are satisfied:

exceeding the active brake hold time;

the gear is switched to a P gear;

the EPB is clamped.

5. The brake-by-wire system according to claim 1, wherein the vehicle state information and preset trigger conditions for the transition of the operating state of the brake-by-wire system from the active hold state to the release state include: any one of the following conditions is satisfied:

the in-place state information of the driver is valid, and the state is 'in-place';

establishing braking;

the accelerator pedal state changes.

6. The brake-by-wire system according to claim 1, wherein the target operating states of the brake-by-wire system in which the timeout state and the release state transition include a standby state.

7. The brake-by-wire system according to claim 1, wherein the operating state of the brake-by-wire system further includes an error state to which the operating state of the brake-by-wire system is shifted when any one of the following conditions is satisfied:

the pedal travel state and the corner position state of the brake-by-wire system are valid;

the presence status information of the driver is invalid;

the throttle state is invalid;

the gear state is invalid;

the EPB state is invalid.

8. The brake-by-wire system of claim 1, wherein the operating state of the brake-by-wire system further comprises an initial state, the initial state comprising checking the brake-by-wire system function enabled state and initializing all module variables, transitioning to the standby state upon completion.

9. The brake-by-wire system of claim 2, wherein the brake-by-wire system is configured to:

and generating a signal for turning off the engine of the vehicle under the condition that the duration of the on-position state information of the driver is determined to be valid and the state is 'off-position' exceeds a set duration threshold and the current gear of the vehicle is D or R gear.

10. A vehicle characterized in that it comprises a brake-by-wire system according to any one of claims 1 to 9.