CN114103905B - Control method, non-decoupling brake-by-wire system and vehicle - Google Patents
Control method, non-decoupling brake-by-wire system and vehicle Download PDFInfo
- Publication number
- CN114103905B CN114103905B CN202010878881.2A CN202010878881A CN114103905B CN 114103905 B CN114103905 B CN 114103905B CN 202010878881 A CN202010878881 A CN 202010878881A CN 114103905 B CN114103905 B CN 114103905B
- Authority
- CN
- China
- Prior art keywords
- pulse
- master cylinder
- control unit
- electronic control
- electronic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/74—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive
- B60T13/745—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with electrical assistance or drive acting on a hydraulic system, e.g. a master cylinder
Landscapes
- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Regulating Braking Force (AREA)
- Braking Systems And Boosters (AREA)
Abstract
The application discloses a control method, a non-decoupling brake-by-wire system and a vehicle, wherein the method comprises the following steps: the first electronic control unit acquires a first pulse oil amount needing to be discharged according to vehicle information and sends a first pulse electric signal corresponding to the first pulse oil amount to the electric control booster; wherein the vehicle information includes a position of a brake pedal and vehicle speed information; the second electronic control unit acquires a first reverse pulse torque required to act on the master cylinder according to the first pulse electric signal, and sends a second pulse electric signal corresponding to the first reverse pulse torque to the electronic stability control system so that the electronic stability control system acts the first pulse oil quantity on the master cylinder and acts the first reverse pulse torque on the master cylinder at the same time. The control method, the non-decoupling brake-by-wire system and the vehicle can solve the problem of brake pedal shaking caused by impact on the master cylinder during active pressurization or decompression compensation of the electronic stability system, and improve the brake comfort.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a control method, a non-decoupling brake-by-wire system and a vehicle.
Background
With the rapid development of automobile technology and the improvement of living standard of people, people have higher requirements on the dynamic property, the economical efficiency, the maneuverability and the comfort of automobiles, and the research on how to improve the use comfort of vehicles is in progress. Among them, the brake function, which is a function frequently used by a user in driving a vehicle, has a great influence on the use comfort of the vehicle. In a non-decoupling brake-by-wire system, a brake pedal is mechanically connected with a main cylinder, and when an electronic stabilization system acts, such as opening and closing of a valve body or coordinated energy recovery of motor action, pulse fluctuation can be caused to an oil path by the work of the electronic stabilization system, and the pulse fluctuation can be directly fed back to the main cylinder, so that the periodic fluctuation of the brake pedal is caused, and the brake comfort is influenced.
Disclosure of Invention
The invention aims to provide a control method, a non-decoupling brake-by-wire system and a vehicle, which can solve the problem of brake pedal shaking caused by impact on a master cylinder when an electronic stability system is actively pressurized or depressurized and improve the brake comfort.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
in a first aspect, an embodiment of the present invention provides a control method, which is applied to a non-decoupling brake-by-wire system, where the non-decoupling brake-by-wire system includes an electronic stability control system, an electronic control booster, a master cylinder, and a brake pedal, the electronic stability control system includes a first electronic control unit, the electronic control booster includes a second electronic control unit, and the method includes:
the method comprises the following steps that a first electronic control unit obtains a first pulse oil amount needing to be discharged according to vehicle information and sends a first pulse electric signal corresponding to the first pulse oil amount to an electric control booster; wherein the vehicle information includes a position of a brake pedal and vehicle speed information;
and the second electronic control unit acquires a first reverse pulse torque required to act on a master cylinder according to the first pulse electric signal, and sends a second pulse electric signal corresponding to the first reverse pulse torque to the electronic stability control system so that the electronic stability control system acts the first pulse oil quantity on the master cylinder and acts the first reverse pulse torque on the master cylinder at the same time.
As one of the implementation modes, the method further comprises the following steps:
the first electronic control unit recalculates the amount of second pulse oil to be discharged according to the second pulse electric signal and the first pulse oil amount, and sends a third pulse electric signal corresponding to the second pulse oil amount to the electric control booster;
and the second electronic control unit acquires a second reverse pulse torque required to act on the master cylinder according to the third pulse electric signal, and sends a fourth pulse electric signal corresponding to the second reverse pulse torque to the electronic stability control system so that the electronic stability control system acts the second pulse oil quantity on the master cylinder and acts the second reverse pulse torque on the master cylinder at the same time.
In one embodiment, the acting force of the first pulse oil amount on the master cylinder is equal to the acting force of the first reverse pulse torque on the master cylinder in magnitude, opposite in direction and same in acting time.
As one of the implementation modes, the method further comprises the following steps:
and when the first electronic control unit determines that a preset braking ending condition is met, sending a braking ending signal to the electronic control booster.
As one embodiment, the magnitude of the first pulse electrical signal is in a linear relationship with the amount of the first pulse oil liquid; the magnitude of the second pulse electric signal is in a linear relation with the first reverse pulse torque.
In a second aspect, an embodiment of the present invention provides a non-decoupling brake-by-wire system, where the system includes a brake pedal, a master cylinder connected to the brake pedal, and an electronic stability control system and an electronic booster both connected to the brake pedal and the master cylinder, where the electronic stability control system includes a first electronic control unit and a first actuator connected to the first electronic control unit, and the electronic booster includes a second electronic control unit and a second actuator connected to the second electronic control unit; wherein the content of the first and second substances,
the first electronic control unit is used for calculating a first pulse oil amount to be discharged according to the opening degree of a brake pedal and sending a first pulse electric signal corresponding to the first pulse oil amount to the second electronic control unit;
and the second electronic control unit is used for acquiring a first reverse pulse torque needing to act on a master cylinder according to the first pulse electric signal, and sending a second pulse electric signal corresponding to the first reverse pulse torque to the first electronic control unit so that the first actuator acts the first pulse oil amount on the master cylinder, and simultaneously controlling the second actuator to act the first reverse pulse torque on the master cylinder.
As one embodiment, the first electronic control unit is further configured to recalculate a second pulse oil amount to be discharged according to the second pulse electric signal and the first pulse oil amount, and send a third pulse electric signal corresponding to the second pulse oil amount to the second electronic control unit;
and the second electronic control unit is also used for acquiring a second reverse pulse torque which needs to act on a master cylinder according to the third pulse electric signal, and sending a fourth pulse electric signal corresponding to the second reverse pulse torque to the first electronic control unit so that the first actuator acts the second pulse oil amount on the master cylinder, and simultaneously controlling the second actuator to act the second reverse pulse torque on the master cylinder.
In one embodiment, the acting force of the first pulse oil amount on the master cylinder is equal in magnitude, opposite in direction and same in acting time as the acting force of the first reverse pulse torque on the master cylinder.
In one embodiment, the first electronic control unit is further configured to send a braking end signal to the second electronic control unit when it is determined that the preset braking end condition is met.
In a third aspect, embodiments of the present invention provide a vehicle comprising a non-decoupled brake-by-wire system according to the second aspect.
The control method, the non-decoupling brake-by-wire system and the vehicle provided by the embodiment of the invention are applied to the non-decoupling brake-by-wire system, the non-decoupling brake-by-wire system comprises an electronic stability control system, an electronic control booster, a master cylinder and a brake pedal, the electronic stability control system comprises a first electronic control unit, the electronic control booster comprises a second electronic control unit, and the method comprises the following steps: the method comprises the following steps that a first electronic control unit obtains a first pulse oil amount needing to be discharged according to vehicle information and sends a first pulse electric signal corresponding to the first pulse oil amount to an electric control booster; wherein the vehicle information comprises position of a brake pedal and vehicle speed information; and the second electronic control unit acquires a first reverse pulse torque required to act on a master cylinder according to the first pulse electric signal, and sends a second pulse electric signal corresponding to the first reverse pulse torque to the electronic stability control system so that the electronic stability control system acts the first pulse oil quantity on the master cylinder and acts the first reverse pulse torque on the master cylinder at the same time. So, electronic control unit of electronic stability control system is when carrying out pressure boost or pressure reduction compensation to brake oil pressure, simultaneously gives electric control booster with pulse electrical signal transmission, and electric control booster's electronic control unit is based on this pulse electrical signal and is used a reverse pulse power in master cylinder department to offset the oil pressure fluctuation, thereby when eliminating electronic stability system initiative pressure boost or decompression compensation through two electronic control unit, because of the problem of the brake pedal shake that arouses to the impact that the master cylinder caused, improved the brake travelling comfort.
Drawings
Fig. 1 is a schematic flowchart of a control method according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a non-decoupling brake-by-wire system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a non-decoupling brake-by-wire system according to an embodiment of the present invention;
fig. 4 is a schematic specific flow chart of controlling the non-decoupling brake-by-wire system according to the embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further elaborated by combining the drawings and the specific embodiments in the specification. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a control method provided for an embodiment of the present invention is applied to a non-decoupling brake-by-wire system, where the non-decoupling brake-by-wire system includes an electronic stability control system, an electronic booster, a master cylinder and a brake pedal, the brake pedal is respectively connected to the master cylinder, the electronic stability control system and the electronic booster, the master cylinder is respectively connected to the electronic stability control system and the electronic booster, the electronic stability control system includes a first electronic control unit, the electronic booster includes a second electronic control unit, and it should be noted that the non-decoupling brake-by-wire system further includes a wheel cylinder, and the control method includes the following steps:
step S101: the method comprises the following steps that a first electronic control unit obtains a first pulse oil amount needing to be discharged according to vehicle information and sends a first pulse electric signal corresponding to the first pulse oil amount to an electric control booster; wherein the vehicle information includes a position of a brake pedal and vehicle speed information;
specifically, when the electronic stability control system determines that active boosting or pressure reduction compensation is required, the first electronic control unit calculates a first pulse oil amount required to be discharged from the whole oil path to the master cylinder according to vehicle information such as the position of a brake pedal and the vehicle speed, generates a first pulse electric signal based on the first pulse oil amount, and sends the first pulse electric signal corresponding to the first pulse oil amount to the electric control booster.
It should be noted that the electronic control booster includes a second electronic control unit, and the electronic stability control system and the electronic control booster realize transmission and reception of pulse electrical signals therebetween through the first electronic control unit and the second electronic control unit. In addition, the electronic stability control system and the electronic control booster respectively comprise an actuator so as to operate the master cylinder.
Step S102: and the second electronic control unit acquires a first reverse pulse torque required to act on a master cylinder according to the first pulse electric signal, and sends a second pulse electric signal corresponding to the first reverse pulse torque to the electronic stability control system so that the electronic stability control system acts the first pulse oil quantity on the master cylinder and acts the first reverse pulse torque on the master cylinder at the same time.
Specifically, after the electronic control booster receives the first pulse electric signal sent by the electronic stability control system, the second electronic control unit obtains a first reverse pulse torque which needs to act on the master cylinder according to the first pulse electric signal, and sends a second pulse electric signal corresponding to the first reverse pulse torque to the electronic stability control system so that the electronic stability control system can act on the first pulse oil amount in the master cylinder and act on the master cylinder simultaneously, so that the electronic stability control system can act on the master cylinder through the acting force of the first pulse oil amount on the master cylinder and the electronic control booster through the acting force of the first reverse pulse torque on the master cylinder are mutually offset, and therefore the shaking of the brake pedal caused by the fluctuation of the brake oil pressure is avoided.
Here, since the electronic stability control system is hydraulically connected to the master cylinder, the electronic stability control system may apply the first pulse oil amount to the master cylinder by transmitting a corresponding pulse oil amount signal to the master cylinder. Optionally, the acting force of the first pulse oil amount on the master cylinder is equal to the acting force of the first reverse pulse torque on the master cylinder in magnitude, opposite in direction and same in acting time, so that the acting force of the first pulse oil amount on the master cylinder and the acting force of the first reverse pulse torque on the master cylinder are exactly offset with each other. In addition, the magnitude of the first pulse electric signal is in a linear relation with the first pulse oil quantity; the magnitude of the second pulse electric signal is in a linear relation with the first reverse pulse torque.
In summary, in the control method provided by the above embodiment, when the first electronic control unit of the electronic stability control system performs pressure increasing or pressure decreasing compensation on the brake oil pressure, the pulse electrical signal is sent to the electronic control booster, and the second electronic control unit of the electronic control booster acts on the master cylinder based on the pulse electrical signal to counteract the oil pressure fluctuation, so that the problem of brake pedal shaking caused by impact on the master cylinder when the electronic stability system actively increases or decreases the pressure is solved by the two electronic control units, and the brake comfort is improved.
In an embodiment, the method may further include:
the first electronic control unit recalculates the amount of second pulse oil to be discharged according to the second pulse electric signal and the first pulse oil amount, and sends a third pulse electric signal corresponding to the second pulse oil amount to the electric control booster;
and the second electronic control unit acquires a second reverse pulse torque which needs to act on a master cylinder according to the third pulse electric signal, and sends a fourth pulse electric signal corresponding to the second reverse pulse torque to the electronic stability control system so that the electronic stability control system acts the second pulse oil quantity on the master cylinder and acts the second reverse pulse torque on the master cylinder at the same time.
It can be understood that under the influence of factors such as the magnitude of the actual reverse pulse torque acting on the master cylinder, environmental fluctuations, etc., the acting force of the first pulse oil amount acting on the master cylinder and the acting force of the first reverse pulse torque acting on the master cylinder may not be completely offset, and the energy recovery coordination is not complete, at this time, the first electronic control unit of the electronic stability control system and the second electronic control unit of the electronic control booster need to continue to perform the braking control operation, so as to achieve the dynamic balance, i.e., the energy recovery coordination, of the electric brake and the hydraulic brake. The first electronic control unit of the electronic stability control system can convert the first reverse pulse torque acting on the master cylinder into the pulse oil amount correspondingly discharged by the electronic booster according to the second pulse electric signal, so that whether the acting forces of the first reverse pulse torque acting on the master cylinder and the second reverse pulse torque acting on the master cylinder are equal or not can be known, correspondingly, the first electronic control unit of the electronic stability control system recalculates the second pulse oil amount needing to be discharged according to the second pulse electric signal and the first pulse oil amount, and sends a third pulse electric signal corresponding to the second pulse oil amount to the electronic booster, and the second electronic control unit of the electronic booster obtains the second reverse pulse torque needing to act on the master cylinder according to the third pulse electric signal, so that the acting force of the second reverse pulse torque on the master cylinder can counteract the sum of the acting force of the second pulse oil amount acting on the master cylinder and the residual acting force of the first pulse oil amount on the master cylinder. It should be noted that the time difference between the third pulse electric signal corresponding to the second pulse oil amount sent to the electric control booster by the first electronic control unit of the electronic stability control system and the first pulse electric signal corresponding to the first pulse oil amount sent to the electric control booster is very short, and the time difference between the fourth pulse electric signal corresponding to the second reverse pulse torque sent to the electronic stability control system by the second electronic control unit of the electric control booster and the second reverse pulse torque acting on the master cylinder is also very short. Therefore, the shake of the brake pedal can be completely eliminated through the closed-loop control of the first electronic control unit of the electronic stabilizing system and the second electronic control unit of the electronic control booster, and the brake comfort is further improved.
In an embodiment, the method may further include: and when the first electronic control unit determines that a preset braking ending condition is met, sending a braking ending signal to the electronic control booster. Here, the preset brake end condition may be energy recovery coordination, that is, dynamic balance between electric braking and hydraulic braking is achieved. When the first electronic control unit of the electronic stability control system determines that a preset braking end condition is met, a braking end signal is sent to the electronic control booster, namely the second electronic control unit, so that the operation of the electronic control booster for applying reverse pulse torque at the main cylinder is ended.
Referring to fig. 2, the non-decoupling brake-by-wire system provided for the embodiment of the present invention includes a brake pedal 10, a master cylinder 20 connected to the brake pedal 10, and an electronic stability control system 30 and an electronic control booster 40 respectively connected to both the brake pedal 10 and the master cylinder 20, where the electronic stability control system 30 includes a first electronic control unit 301 and a first actuator 302 connected to the first electronic control unit 301, and the electronic control booster 40 includes a second electronic control unit 401 and a second actuator 402 connected to the second electronic control unit 401; wherein the content of the first and second substances,
the first electronic control unit 301 is configured to obtain a first pulse oil amount to be discharged according to vehicle information, and send a first pulse electrical signal corresponding to the first pulse oil amount to the second electronic control unit 401; wherein the vehicle information includes position of the brake pedal 10 and vehicle speed information;
the second electronic control unit 401 is configured to obtain a first reverse pulse torque that needs to be applied to the master cylinder 20 according to the first pulse electrical signal, send a second pulse electrical signal corresponding to the first reverse pulse torque to the first electronic control unit 301, so that the first actuator 302 applies the first pulse oil amount to the master cylinder 20, and control the second actuator 402 to apply the first reverse pulse torque to the master cylinder 20.
Here, when determining that active pressure-increasing or pressure-decreasing compensation is required, the first electronic control unit 301 calculates a first pulse oil amount required to be discharged from the entire oil path to the master cylinder 20 from vehicle information such as the position of the brake pedal 10 and the vehicle speed, generates a first pulse electric signal based on the first pulse oil amount, and transmits the first pulse electric signal corresponding to the first pulse oil amount to the second electronic control unit 401. After receiving the first pulse electrical signal sent by the first electronic control unit 301, the second electronic control unit 401 obtains a first reverse pulse torque that needs to be applied to the master cylinder 20 according to the first pulse electrical signal, and sends a second pulse electrical signal corresponding to the first reverse pulse torque to the first electronic control unit 301, so that the first actuator 302 applies the first pulse oil amount to the master cylinder 20, and at the same time, the second actuator 402 is controlled to apply the first reverse pulse torque to the master cylinder 20, so that the acting force of the electronic stability control system 3 on the master cylinder 20 through the first pulse oil amount and the acting force of the electronic control booster 4 on the master cylinder 20 through the first reverse pulse torque are mutually offset, and thus, the brake pedal 10 is prevented from shaking due to the fluctuation of brake oil pressure.
Here, since the electronic stability control system 30 is hydraulically connected to the master cylinder 20, the electronic stability control system 3 may apply the first pulse oil amount to the master cylinder 20 by transmitting a corresponding pulse oil amount signal to the master cylinder 20. Optionally, the acting force of the first pulse oil amount on the master cylinder 20 and the acting force of the first reverse pulse torque on the master cylinder 20 are equal in magnitude, opposite in direction and same in acting time, so that the acting force of the first pulse oil amount on the master cylinder 20 and the acting force of the first reverse pulse torque on the master cylinder 20 are exactly offset with each other. In addition, the magnitude of the first pulse electric signal is in a linear relation with the first pulse oil quantity; the magnitude of the second pulse electric signal is in a linear relation with the first reverse pulse torque.
In summary, in the non-decoupling brake-by-wire system provided in the above embodiment, when the first electronic control unit of the electronic stability control system boosts or reduces the brake oil pressure, the pulse electrical signal is sent to the electronic control booster, and the second electronic control unit of the electronic control booster applies a reverse pulse force to the master cylinder based on the pulse electrical signal to cancel the oil pressure fluctuation, so that the problem of brake pedal shaking caused by impact on the master cylinder when the electronic stability system actively boosts or reduces the pressure is solved by the two electronic control units, and the brake comfort is improved.
In one embodiment of the method of the present invention,
the first electronic control unit 301 is further configured to recalculate the amount of the second pulse oil to be discharged according to the second pulse electrical signal and the first pulse oil amount, and send a third pulse electrical signal corresponding to the second pulse oil amount to the second electronic control unit 401;
the second electronic control unit 401 is further configured to obtain a second reverse pulse torque that needs to be applied to the master cylinder 20 according to the third pulse electrical signal, send a fourth pulse electrical signal corresponding to the second reverse pulse torque to the first electronic control unit 301, so that the first actuator 302 applies the second pulse oil amount to the master cylinder 20, and control the second actuator 402 to apply the second reverse pulse torque to the master cylinder 20.
It can be understood that, under the influence of the actual reverse pulse torque acting on the master cylinder 20, environmental fluctuations, and other factors, the acting force of the first pulse oil amount acting on the master cylinder 20 and the acting force of the first reverse pulse torque acting on the master cylinder 20 may not be completely cancelled, and the energy recovery coordination is not completed, at this time, the first electronic control unit 301 and the second electronic control unit 401 need to continue to perform the brake control operation, so as to achieve the dynamic balance of the electric brake and the hydraulic brake, i.e., the energy recovery coordination. Here, with the amount of the pulse oil as a measurement standard, the first electronic control unit 301 can convert the first reverse pulse torque acting on the master cylinder 20 into the amount of the pulse oil correspondingly discharged by the electric control booster 4 according to the second pulse electric signal, so as to know whether the acting forces of the first electronic control unit 301 and the second electronic control unit 401 on the master cylinder are equal, that is, whether the amount of the pulse oil correspondingly discharged is equal, accordingly, the first electronic control unit 301 recalculates the second pulse oil amount required to be discharged according to the second pulse electric signal and the first pulse oil amount, and sends a third pulse electric signal corresponding to the second pulse oil amount to the second electronic control unit 401, and the second electronic control unit 401 obtains the second reverse pulse torque required to act on the master cylinder according to the third pulse electric signal, so that the acting force of the second reverse pulse torque on the master cylinder 20 can offset the sum of the acting force of the second pulse oil amount on the master cylinder 20 and the residual acting force of the first pulse oil amount on the master cylinder. It should be noted that a time difference between the first electronic control unit 301 sending the third pulse electric signal corresponding to the second pulse oil amount to the second electronic control unit 401 and the first pulse electric signal corresponding to the first pulse oil amount to the second electronic control unit 401 is very short, and a time difference between the second electronic control unit 401 sending the fourth pulse electric signal corresponding to the second reverse pulse torque to the first electronic control unit 301 and the second reverse pulse torque being applied to the master cylinder 20 is also very short. In this way, through the closed-loop control of the first electronic control unit 301 and the second electronic control unit 401, the brake pedal 10 shake is completely eliminated, and the braking comfort is further improved.
In one embodiment, the first electronic control unit 301 is further configured to send a braking end signal to the second electronic control unit 401 when it is determined that the preset braking end condition is met. Here, the preset brake end condition may be energy recovery coordination, that is, dynamic balance between electric braking and hydraulic braking is achieved. When the first electronic control unit 301 determines that the preset brake end condition is satisfied, a brake end signal is transmitted to the second electronic control unit 401 to end the operation of the second electronic control unit 401 to apply the reverse pulse torque at the master cylinder 20.
Based on the same inventive concept of the previous embodiment, the embodiment of the invention provides a vehicle which comprises the non-decoupling brake-by-wire system of the embodiment.
Based on the same inventive concept of the foregoing embodiments, the present embodiment describes technical solutions of the foregoing embodiments in detail through specific examples. Referring to fig. 3, which is a schematic diagram of a specific structure of the non-decoupling brake-by-wire system according to the embodiment of the present invention, the Electronic stability system includes an Electronic Control Unit (ECU), which is denoted as ECU1; the electric booster comprises an electronic control unit, which is marked as ECU2 and a displacement sensor. The ECU1 and the ECU2 can carry out pulse strategy control on the whole brake oil pressure, and the control of the dual-ECU closed-loop system is executed in the active pressurization or depressurization process of the electronic stability system. Here, the operating principle of the non-decoupled brake-by-wire system is as follows: when the electronic stabilization system is actively pressurized or depressurized and compensated, the ECU1 calculates the pulse oil liquid amount 2 and feeds back a pulse electric signal 1 to the ECU2 of the electronic control booster; the ECU2 of the electric control booster calculates pulse torque 4 according to the pulse electric signal 1 and feeds back the pulse electric signal 3 to the ECU1; the pulse oil amount 2 acts at the master cylinder simultaneously with the pulse torque 4. Wherein, the size of a pulse electric signal 1 of the electronic stabilization system and the amount 2 of pulse oil liquid are in a linear relation; the magnitude of a pulse electric signal 3 of the electric control booster is in a linear relation with a pulse torque 4; meanwhile, the acting force of the pulse oil volume 2 of the electronic stabilizing system on the main cylinder is equal to the acting force of the pulse torque of the electric control booster on the main cylinder in magnitude, opposite in direction and same in acting time.
Based on the working principle, the specific control process of the non-decoupling brake-by-wire system is as follows:
the current moment when the electronic stabilization system prepares for pressure boost compensation is recorded as the Nth moment;
at the Nth time: the electronic stabilization system sends a pulse electric signal 1 to the electric control booster, and the pulse electric signal 1 corresponds to the pulse oil amount 2 to be discharged;
time N + 1: the electric control booster calculates reverse pulse torque 4 required to act on the master cylinder according to the received pulse electric signal 1, and sends a corresponding pulse electric signal 3 to the electronic stabilizing system;
time N + 2: the electronic stabilizing system and the electric control booster simultaneously apply pulse signals to the master cylinder, the electronic stabilizing system correspondingly discharges the pulse oil liquid amount 2 at the Nth moment, and the electric control booster applies the reverse pulse torque 4 corresponding to the (N + 1) th moment; meanwhile, the electronic stabilizing system calculates the pulse oil liquid amount and the pulse electric signal required at the next moment according to the received pulse electric signal 3 at the (N + 1) th moment and the whole vehicle oil pressure;
time N + 3: the electronic control booster repeats the step at the (N + 1) th moment;
time N + 4: repeating the N +2 th moment by the electronic stabilizing system and the electric control booster;
……
moment 2N + 1: and when the electronic stabilization system monitors that the energy recovery coordination is finished, sending an ending signal to the electronic control booster.
At the same time, the interval between each time instant is extremely short.
Based on the control process, referring to fig. 4, a specific flowchart for controlling the non-decoupling brake-by-wire system provided in the embodiment of the present invention includes the following steps:
step S201: the electronic stabilization system sends a pulse electric signal at the current moment to the electric control booster, and the pulse electric signal corresponds to the pulse oil amount to be discharged;
step S202: the electric control booster calculates reverse pulse torque required to act on the master cylinder according to the pulse electric signals sent by the electronic stabilization system, and sends the corresponding pulse electric signals to the electronic stabilization system;
step S203: the electronic stabilizing system and the electric control booster simultaneously apply pulse signals to the main cylinder so that the electronic stabilizing system correspondingly discharges the pulse oil liquid amount, and the electric control booster applies corresponding reverse pulse torque;
step S204: the electronic stability system detects whether the energy recovery coordination is completed, if so, step S206 is executed, otherwise, step 205 is executed;
step S205: the electronic stabilization system calculates the pulse oil liquid amount and the pulse electric signal required at the next moment according to the pulse electric signal sent by the electric control booster and the oil pressure of the whole vehicle, and returns to execute the step S201;
step S206: the electronic stability system sends an end signal to the electronically controlled booster.
Here, through the above control flow, that is, the dual ECU closed loop control, when the electronic stability system actively boosts/decompresses the compensation, the electric control booster applies a reverse pulse force at the master cylinder, thereby offsetting the oil pressure fluctuation, avoiding the brake pedal from shaking, and thus improving the brake comfort. The non-decoupling brake-by-wire system provided by the embodiment has the following advantages: on the basis of the original brake system, a software control strategy is newly added, the hardware cost is not increased, and the original hardware structure is reserved; the brake pedal shaking in the non-decoupling brake-by-wire system is completely eliminated, namely the brake pedal shaking caused by impact on the main cylinder when the electronic stabilizing system actively boosts/decompresses and compensates is eliminated, so that the brake comfort is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
As used herein, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, including not only those elements listed, but also other elements not expressly listed.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A control method is applied to a non-decoupling brake-by-wire system, the non-decoupling brake-by-wire system comprises an electronic stability control system, an electronic control booster, a main cylinder and a brake pedal, the electronic stability control system comprises a first electronic control unit, the electronic control booster comprises a second electronic control unit, and the method comprises the following steps:
the method comprises the following steps that a first electronic control unit obtains a first pulse oil amount needing to be discharged according to vehicle information and sends a first pulse electric signal corresponding to the first pulse oil amount to an electric control booster; wherein the vehicle information includes a position of a brake pedal and vehicle speed information;
the second electronic control unit acquires a first reverse pulse torque required to act on a master cylinder according to the first pulse electric signal, and sends a second pulse electric signal corresponding to the first reverse pulse torque to the electronic stability control system so that the electronic stability control system acts the first pulse oil quantity on the master cylinder and acts the first reverse pulse torque on the master cylinder at the same time;
the acting force of the first pulse oil quantity on the master cylinder and the acting force of the first reverse pulse torque on the master cylinder are equal in magnitude, opposite in direction and same in acting time.
2. The method of claim 1, further comprising:
the first electronic control unit recalculates the amount of second pulse oil to be discharged according to the second pulse electric signal and the first pulse oil amount, and sends a third pulse electric signal corresponding to the second pulse oil amount to the electric control booster;
and the second electronic control unit acquires a second reverse pulse torque required to act on the master cylinder through the third pulse electric signal, and sends a fourth pulse electric signal corresponding to the second reverse pulse torque to the electronic stability control system so that the electronic stability control system acts the second pulse oil quantity on the master cylinder and acts the second reverse pulse torque on the master cylinder at the same time.
3. The method of claim 1, further comprising:
and when the first electronic control unit determines that a preset braking ending condition is met, sending a braking ending signal to the electronic control booster.
4. The method of claim 1, wherein the magnitude of the first pulsed electrical signal is linear with the amount of the first pulsed oil; the magnitude of the second pulse electric signal is in a linear relation with the first reverse pulse torque.
5. A non-decoupling brake-by-wire system is characterized by comprising a brake pedal, a master cylinder connected with the brake pedal, an electronic stability control system and an electric control booster, wherein the electronic stability control system and the electric control booster are respectively connected with the brake pedal and the master cylinder; wherein the content of the first and second substances,
the first electronic control unit is used for acquiring a first pulse oil amount needing to be discharged according to vehicle information and sending a first pulse electric signal corresponding to the first pulse oil amount to the second electronic control unit; wherein the vehicle information includes a position of a brake pedal and vehicle speed information;
the second electronic control unit is used for acquiring a first reverse pulse torque needing to act on a master cylinder according to the first pulse electric signal, and sending a second pulse electric signal corresponding to the first reverse pulse torque to the first electronic control unit so that the first actuator acts the first pulse oil amount on the master cylinder, and meanwhile, the second actuator is controlled to act the first reverse pulse torque on the master cylinder;
the acting force of the first pulse oil quantity on the master cylinder and the acting force of the first reverse pulse torque on the master cylinder are equal in magnitude, opposite in direction and same in acting time.
6. The system of claim 5,
the first electronic control unit is also used for recalculating the amount of second pulse oil to be discharged according to the second pulse electric signal and the first pulse oil amount and sending a third pulse electric signal corresponding to the second pulse oil amount to the second electronic control unit;
and the second electronic control unit is also used for acquiring a second reverse pulse torque which needs to act on a master cylinder according to the third pulse electric signal, and sending a fourth pulse electric signal corresponding to the second reverse pulse torque to the first electronic control unit so that the first actuator acts the second pulse oil amount on the master cylinder, and simultaneously controlling the second actuator to act the second reverse pulse torque on the master cylinder.
7. The system of claim 5, wherein the first electronic control unit is further configured to send a brake end signal to the second electronic control unit upon determining that the predetermined brake end condition is met.
8. A vehicle, characterized in that it comprises a non-decoupled brake-by-wire system according to any one of claims 5 to 7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010878881.2A CN114103905B (en) | 2020-08-27 | 2020-08-27 | Control method, non-decoupling brake-by-wire system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010878881.2A CN114103905B (en) | 2020-08-27 | 2020-08-27 | Control method, non-decoupling brake-by-wire system and vehicle |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114103905A CN114103905A (en) | 2022-03-01 |
| CN114103905B true CN114103905B (en) | 2023-03-24 |
Family
ID=80374591
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010878881.2A Active CN114103905B (en) | 2020-08-27 | 2020-08-27 | Control method, non-decoupling brake-by-wire system and vehicle |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114103905B (en) |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4563801B2 (en) * | 2002-07-09 | 2010-10-13 | コンチネンタル・テベス・アーゲー・ウント・コンパニー・オーハーゲー | Brake-by-wire actuator |
| JP2012040964A (en) * | 2010-08-20 | 2012-03-01 | Toyota Motor Corp | Vehicle brake control device |
| DE102011084746B4 (en) * | 2011-10-19 | 2021-02-11 | Ford Global Technologies, Llc | Control method for a hydraulic brake system of a motor vehicle and a brake system |
| CN109760654B (en) * | 2018-12-28 | 2023-02-03 | 上海擎度汽车科技有限公司 | Electronic hydraulic brake system control module and pressure control method |
| CN111152772B (en) * | 2020-01-02 | 2020-10-09 | 佛山市一为制动技术有限公司 | Brake system oil pressure fluctuation suppression device, brake system oil pressure fluctuation suppression device equipment and brake master cylinder |
-
2020
- 2020-08-27 CN CN202010878881.2A patent/CN114103905B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN114103905A (en) | 2022-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102529926B (en) | Brake control system and method for an electrically driven vehicle | |
| JP5604531B2 (en) | Brake booster and method and apparatus for operating the brake booster | |
| JP5320380B2 (en) | Brake device for vehicle | |
| US8123310B2 (en) | Method for controlling a brake system of a motor vehicle | |
| CN100560416C (en) | Electric power steering control setup with vehicle of the wheel slip control system that steered wheel is worked | |
| EP2371643A1 (en) | Brake device and method of controlling brake device | |
| US9199618B2 (en) | Electrohydraulic brake system and method for operating the same | |
| US9254827B2 (en) | Operation of a brake booster as a pedal simulator | |
| CN102137779B (en) | Brake control apparatus | |
| US9180780B2 (en) | Method for controlling a motor vehicle brake system | |
| JP5831486B2 (en) | Brake system | |
| CN102442288B (en) | Brakes and the method for operation brake system of car for automobile | |
| US20090302673A1 (en) | Method for operating a combined vehicle braking system | |
| JP4816085B2 (en) | Braking device for vehicle | |
| US20090069149A1 (en) | Brake force control device and method | |
| CN105189223B (en) | The control device and operation method from primary brake system of the brake force enhancing of vehicle | |
| EP1081005A3 (en) | Vehicle braking apparatus and vehicle braking method | |
| CN104684773A (en) | Method for controlling a braking system for motor vehicles | |
| CN103201146A (en) | Electric vehicle brake control device | |
| CN105073534A (en) | Electric booster device | |
| JP2002523297A (en) | A brake device that combines pressure boosting and adjustment | |
| US20120062024A1 (en) | Brake booster system for a vehicle brake system and method for operating a vehicle brake system | |
| CN114103905B (en) | Control method, non-decoupling brake-by-wire system and vehicle | |
| US20050096814A1 (en) | Method for operating a steering system for a motor vehicle and steering system | |
| CN109367395B (en) | Electrohydraulic composite braking system and control method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |