CN112026738A - Control method and device of electric power-assisted brake system and vehicle - Google Patents
Control method and device of electric power-assisted brake system and vehicle Download PDFInfo
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- CN112026738A CN112026738A CN202010921773.9A CN202010921773A CN112026738A CN 112026738 A CN112026738 A CN 112026738A CN 202010921773 A CN202010921773 A CN 202010921773A CN 112026738 A CN112026738 A CN 112026738A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T17/00—Component parts, details, or accessories of power brake systems not covered by groups B60T8/00, B60T13/00 or B60T15/00, or presenting other characteristic features
- B60T17/18—Safety devices; Monitoring
- B60T17/22—Devices for monitoring or checking brake systems; Signal devices
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K35/00—Arrangement of adaptations of instruments
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Valves And Accessory Devices For Braking Systems (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a control method of an electric power-assisted brake system, which comprises the following steps: acquiring a target deceleration of the vehicle; acquiring an actual deceleration of the vehicle; calculating a difference between the target deceleration and the actual deceleration; judging whether the difference value is greater than or equal to a first preset value; if the difference value is larger than or equal to the first preset value, the electric power-assisted braking system breaks down and sends alarm information to a whole vehicle instrument, so that when the vehicle is in an under-load state, a driver is warned in an early mode, the driver can take corresponding measures, and driving danger is avoided. The invention also discloses a control device of the electric power-assisted brake system and a vehicle.
Description
Technical Field
The embodiment of the invention relates to the technical field of vehicles, in particular to a control method and device of an electric power-assisted brake system and a vehicle.
Background
The traditional vehicle is provided with the traditional vacuum booster, the pure mechanical boosting system cannot monitor the vehicle state from the angle of the whole vehicle, and cannot give an alarm when the vehicle is in an under-load state, namely, brake fluid in a braking system of the vehicle in a sealing state leaks, or air enters a braking pipeline, so that the brake is soft and in the under-load state, and at the moment, if a driver brakes the working condition, the driver can be alarmed and dangerous to drive.
Disclosure of Invention
The invention provides a control method and a control device of an electric power-assisted brake system and a vehicle, which are used for early warning a driver when the vehicle is in an under-load state, so that the driver can take countermeasures and driving danger is avoided.
In order to achieve the above object, a first embodiment of the present invention provides a control method for an electric power-assisted brake system, including the steps of:
acquiring a target deceleration of the vehicle;
acquiring an actual deceleration of the vehicle;
calculating a difference between the target deceleration and the actual deceleration;
judging whether the difference value is greater than or equal to a first preset value;
and if the difference value is larger than or equal to a first preset value, the electric power-assisted braking system breaks down, and alarm information is sent to a whole vehicle instrument.
Optionally, the obtaining of the target deceleration of the vehicle includes:
acquiring an average value of a target deceleration of the vehicle;
the acquiring the actual deceleration of the vehicle includes:
obtaining an average value of an actual deceleration of the vehicle;
calculating the difference between the target deceleration and the actual deceleration includes:
a difference between the average value of the target deceleration of the vehicle and the average value of the actual deceleration of the vehicle is calculated.
Optionally, the obtaining of the average value of the target deceleration of the vehicle includes:
acquiring N target decelerations, summing the N target decelerations and dividing the N target decelerations by N to acquire an average value of the target decelerations of the vehicle;
the obtaining of the average value of the actual deceleration of the vehicle includes:
acquiring N actual decelerations, summing the N actual decelerations and dividing the N actual decelerations by N to acquire an average value of the actual decelerations of the vehicle; wherein N is more than or equal to 2 and is a positive integer.
Optionally, before the calculating the difference between the target deceleration and the actual deceleration, further comprising:
acquiring the speed of the vehicle;
calculating a difference between the target deceleration and the actual deceleration if the vehicle speed of the vehicle is greater than or equal to a second preset value;
and if the vehicle speed of the vehicle is less than a second preset value, returning to the step of acquiring the vehicle speed of the vehicle.
Optionally, before the calculating the difference between the target deceleration and the actual deceleration, further comprising:
acquiring the whole vehicle control state of the vehicle;
if the entire vehicle control state of the vehicle is in a steady state, a difference between the target deceleration and the actual deceleration is calculated.
Optionally, before the calculating the difference between the target deceleration and the actual deceleration, further comprising:
acquiring the opening degree of a brake pedal;
calculating a difference between the target deceleration and the actual deceleration if the brake pedal opening degree is greater than or equal to a fourth preset value;
and if the opening degree of the brake pedal is smaller than a fourth preset value, returning to the step of obtaining the opening degree of the brake pedal.
Optionally, the electric power assisting system fault further includes before sending alarm information to the whole vehicle instrument:
if the difference value is larger than or equal to the first preset value, counting the number of faults at preset time intervals;
when the continuous counting value is larger than or equal to a fifth preset value, the electric power-assisted system breaks down and sends alarm information to a whole vehicle instrument;
and clearing the counting when the continuous counting value is smaller than the fifth preset value, and restarting the step of counting the failure times at the interval preset time.
Optionally, the electric power system trouble sends alarm information to whole car instrument and includes:
and controlling an alarm lamp of the whole vehicle instrument to flash and/or controlling a buzzer of the whole vehicle instrument to buzz.
In order to achieve the above object, a second aspect of the present invention provides a control device for an electric power-assisted brake system, including:
a target deceleration obtaining module for obtaining a target deceleration of the vehicle;
an actual deceleration obtaining module for obtaining an actual deceleration of the vehicle;
a calculation module for calculating a difference between the target deceleration and the actual deceleration;
the judging module is used for judging whether the difference value is larger than or equal to a first preset value or not;
and the alarm module is used for sending alarm information to a whole vehicle instrument if the difference value is greater than or equal to a first preset value and the electric power-assisted brake system fails.
Optionally, the target deceleration obtaining module includes:
a target deceleration obtaining submodule for obtaining an average value of a target deceleration of the vehicle;
the actual deceleration obtaining module includes:
an actual deceleration obtaining submodule for obtaining an average value of actual deceleration of the vehicle;
the calculation module comprises:
a calculation submodule for calculating a difference between the average value of the target deceleration of the vehicle and the average value of the actual deceleration of the vehicle.
Optionally, the target deceleration obtaining submodule is configured to obtain N target decelerations, sum and divide the N target decelerations by N to obtain an average value of the target decelerations of the vehicle;
the actual deceleration obtaining submodule is used for obtaining N actual decelerations, summing the N actual decelerations and dividing the N actual decelerations by N to obtain an average value of the actual decelerations of the vehicle; wherein N is more than or equal to 2 and is a positive integer.
Optionally, the control device of the electric power-assisted brake system further includes:
the vehicle speed module is used for acquiring the vehicle speed of the vehicle;
a second judgment module for calculating a difference between the target deceleration and the actual deceleration if the vehicle speed of the vehicle is greater than or equal to a second preset value;
and if the vehicle speed of the vehicle is less than a second preset value, continuously acquiring the vehicle speed of the vehicle.
Optionally, the control device of the electric power-assisted brake system further includes:
the vehicle control state acquisition module is used for acquiring the vehicle control state of the vehicle;
and the third judgment module is used for calculating the difference value between the target deceleration and the actual deceleration if the whole vehicle control state of the vehicle is in a stable state.
Optionally, the control device of the electric power-assisted brake system further includes:
the brake pedal opening obtaining module is used for obtaining the brake pedal opening;
a fourth judgment module, configured to calculate a difference between the target deceleration and the actual deceleration if the brake pedal opening is greater than or equal to a fourth preset value;
and if the opening degree of the brake pedal is smaller than a fourth preset value, continuously acquiring the opening degree of the brake pedal.
Optionally, the control device of the electric power-assisted brake system further includes:
the counting module is used for counting the number of faults at preset time intervals if the difference value is greater than or equal to the first preset value;
the fifth judgment module is used for sending alarm information to a whole vehicle instrument when the continuous counting value is larger than or equal to a fifth preset value and the electric power assisting system fails;
and when the continuous counting value is smaller than the fifth preset value, clearing the counting, and restarting the interval preset time to count the failure times.
Optionally, the alarm module is used for controlling an alarm lamp of the whole vehicle instrument to flash and/or controlling a buzzer of the whole vehicle instrument to buzz.
In order to achieve the above object, a vehicle according to a third aspect of the present invention includes the control device of the electric power-assisted brake system.
According to the control method and device of the electric power-assisted brake system and the vehicle, firstly, the target deceleration of the vehicle is obtained, and the actual deceleration of the vehicle is obtained; then calculating a difference between the target deceleration and the actual deceleration; then judging whether the difference value is greater than or equal to a first preset value; if the difference value is larger than or equal to the first preset value, the electric power-assisted braking system breaks down and sends alarm information to a whole vehicle instrument, so that when the vehicle is in an under-load state, a driver is warned in an early mode, the driver can take corresponding measures, and driving danger is avoided.
Drawings
FIG. 1 is a flow chart of a method of controlling an electric power assisted brake system of an embodiment of the present invention;
FIG. 2 is a flow chart of a method of controlling an electric power assisted brake system according to an embodiment of the present invention;
FIG. 3 is a flow chart of a method of controlling an electric power assisted brake system according to another embodiment of the present invention;
FIG. 4 is a flowchart of a control method of an electric power assisted brake system according to yet another embodiment of the present invention;
FIG. 5 is a flowchart of a control method of an electric power assisted brake system according to yet another embodiment of the present invention;
FIG. 6 is a flow chart of a method of controlling an electrically assisted brake system according to yet another embodiment of the present invention;
FIG. 7 is a block schematic diagram of a control arrangement for an electric power assisted brake system in accordance with an embodiment of the present invention;
fig. 8 is a block diagram schematically illustrating a control device of an electric power assisted brake system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.
Fig. 1 is a flowchart of a control method of an electric power-assisted brake system according to an embodiment of the present invention. As shown in fig. 1, the control method of the electric power-assisted brake system includes the following steps:
s101, acquiring a target deceleration of a vehicle;
the target deceleration of the vehicle corresponds to the opening degree of the brake pedal in a one-to-one manner, and the larger the opening degree of the brake pedal is, the larger the target deceleration is, wherein the target deceleration can be obtained according to a relation curve of the opening degree of the brake pedal and the target deceleration, and the relation curve of the opening degree of the brake pedal and the target deceleration can be calibrated in advance and is prestored in the vehicle controller.
S102, acquiring the actual deceleration of the vehicle;
the actual deceleration of the vehicle may be obtained by a deceleration sensor of the vehicle.
S103, calculating a difference value between the target deceleration and the actual deceleration;
s104, judging whether the difference value is larger than or equal to a first preset value;
wherein the first preset value is preferably 0.3 g. If the first preset value is too large, the alarm is triggered under the condition that the vehicle is dangerous, if the first preset value is too small, false triggering can occur, and the alarm is also given out under the condition that the alarm is not needed, so that certain trouble is caused to a driver.
And S105, if the difference value is larger than or equal to the first preset value, the electric power-assisted brake system breaks down, and alarm information is sent to a whole vehicle instrument.
That is, if the difference between the target deceleration and the actual deceleration of the vehicle is greater than or equal to 0.3g, it is determined that the electric power-assisted brake system is faulty, and an alarm message is sent to the vehicle instrument to remind the driver, so that the driver can take certain measures, such as sending the vehicle to a maintenance shop for maintenance, etc.
Alternatively, as shown in fig. 2, the step S101 of obtaining the target deceleration of the vehicle includes:
s1011, acquiring an average value of the target deceleration of the vehicle;
wherein obtaining the average value of the target deceleration of the vehicle includes:
acquiring N target decelerations, summing the N target decelerations and dividing the N target decelerations by N to acquire an average value of the target decelerations of the vehicle; wherein N is more than or equal to 2 and is a positive integer.
For example, the driver steps on the brake pedal, obtains one target deceleration every preset time (1.5ms), and preferably, obtains three different target decelerations, sums the three different target decelerations, and divides by three to obtain an average value of the target decelerations.
The step S102 of acquiring the actual deceleration of the vehicle includes:
s1021, acquiring an average value of the actual deceleration of the vehicle;
the obtaining of the average value of the actual deceleration of the vehicle includes:
acquiring N actual decelerations, summing the N actual decelerations and dividing the N actual decelerations by N to acquire an average value of the actual decelerations of the vehicle; wherein N is more than or equal to 2 and is a positive integer.
The vehicle control unit acquires an actual deceleration value from the deceleration sensor at preset time intervals (1.5ms) every time a driver steps on a brake pedal, acquires an actual deceleration at 1.5ms intervals after the driver steps on the brake pedal until three actual decelerations are acquired, and adds and averages the three actual decelerations to calculate and acquire an actual deceleration average value of the vehicle.
Calculating the difference between the target deceleration and the actual deceleration at step S103 includes:
and S1031, calculating a difference value between the average value of the target deceleration of the vehicle and the average value of the actual deceleration of the vehicle.
For example, the target deceleration of the vehicle is 0.3g, 0.5g, 0.4g for three times, respectively, and the average value of the target deceleration of the vehicle is 0.4 g. The actual decelerations corresponding to the three target decelerations are 0.3g, 0.4g, 0.2g, respectively, and the average value of the actual decelerations of the vehicle is 0.3 g. The difference value between the two is 0.1g and less than 0.3g, and at the moment, no alarm is given.
The target deceleration of the vehicle is 0.3g, 0.5g, 0.4g for three times, respectively, and the average value of the target deceleration of the vehicle is 0.4 g. The actual decelerations corresponding to the three target decelerations are 0.1g, 0.1g, 0.1g, respectively, and the average value of the actual decelerations of the vehicle is 0.1 g. The difference between the two is 0.3g and is equal to 0.3g, and at the moment, the vehicle gives a fault alarm.
Alternatively, as shown in fig. 3, before calculating the difference between the target deceleration and the actual deceleration, that is, before step S103, the method further includes:
s106, acquiring the speed of the vehicle;
s107, if the vehicle speed of the vehicle is greater than or equal to a second preset value, calculating a difference value between the target deceleration and the actual deceleration;
and if the vehicle speed of the vehicle is less than the second preset value, returning to the step S106.
The second preset value is preferably 30Km/h, i.e. the calculation of the difference between the target deceleration and the actual deceleration is only initiated if the vehicle speed value of the vehicle is greater than 30 Km/h.
Alternatively, as shown in fig. 4, before calculating the difference between the target deceleration and the actual deceleration, that is, before step S103, the method further includes:
s108, acquiring the whole vehicle control state of the vehicle;
s109, if the entire vehicle control state of the vehicle is in a steady state, a difference between the target deceleration and the actual deceleration is calculated.
Whether the Control state of the whole Vehicle is in a stable state or not can be judged according to whether an activation signal such as an ABS (Anti-lock Braking System), a VDC (Vehicle dynamic Control), an HBA (Hydraulic Brake assist System) and the like of the Vehicle is obtained or not, if one of the signals is activated, the current Vehicle speed of the Vehicle is unstable and is in states such as bump, shake, slip and inclination, and after the working condition is identified, in order to avoid misjudgment, the functional diagnosis needs to be shielded under the working condition, and the calculation of the difference value between the target deceleration and the actual deceleration is not carried out. If one of the signals of the ABS, the VDC and the HBA is not acquired to be activated, the vehicle is in a general urban road condition or a climbing road condition, the control state of the whole vehicle is in a stable state, and at the moment, the difference value between the target deceleration and the actual deceleration is calculated.
Alternatively, as shown in fig. 5, before calculating the difference between the target deceleration and the actual deceleration, that is, before step S103, the method further includes:
s110, obtaining the opening degree of a brake pedal;
s111, if the opening degree of the brake pedal is larger than or equal to a fourth preset value, calculating a difference value between the target deceleration and the actual deceleration;
and if the opening degree of the brake pedal is smaller than the fourth preset value, returning to the step of obtaining the opening degree of the brake pedal.
The fourth preset value is preferably 2%, that is, the calculation of the difference between the target deceleration and the actual deceleration is performed only when the driver depresses the brake pedal with a certain opening degree.
Optionally, as shown in fig. 6, before the failure of the electric power assisting system and sending the alarm information to the vehicle instrument, that is, before step S105, the method further includes:
s112, if the difference value is larger than or equal to the first preset value, counting the number of faults at preset time intervals;
s113, when the continuous counting value is larger than or equal to a fifth preset value, the electric power assisting system breaks down and sends alarm information to a whole vehicle instrument;
and S114, when the continuous counting value is smaller than the fifth preset value, clearing the counting, and restarting the step of counting the failure times at preset time intervals.
That is, the difference between the target deceleration and the actual deceleration is calculated every predetermined time (5ms), and a malfunction alarm and a non-malfunction state occur. After 5ms fault judgment is carried out once, if the fault alarm state is the fault alarm state, the count of the fault alarm state is increased by 1, and when the continuous count is more than or equal to three times, namely the continuous three times are all the fault alarm states, the electric power-assisted system is in fault, and alarm information is sent to a whole vehicle instrument.
And when the continuous counting is less than three times, namely, the continuous counting is in a fault alarm state for two times, and the counting in the fault alarm state is cleared when the continuous counting is in a non-fault alarm state for the third time, and the counting in the fault alarm state is repeated. And sending alarm information to the whole vehicle instrument until the continuous counting of the fault alarm state is more than three times. Thereby avoiding false triggering of a fault alarm condition.
Optionally, step S105 is performed when the electric power assisting system fails, and sending the alarm information to the vehicle instrument includes:
and controlling an alarm lamp of the whole vehicle instrument to flash and/or controlling a buzzer of the whole vehicle instrument to buzz.
Fig. 7 is a block diagram schematically illustrating a control apparatus of an electric power-assisted brake system according to an embodiment of the present invention, and as shown in fig. 7, the control apparatus of the electric power-assisted brake system includes:
a target deceleration obtaining module 101 for obtaining a target deceleration of the vehicle;
an actual deceleration obtaining module 102 for obtaining an actual deceleration of the vehicle;
a calculation module 103 for calculating a difference between the target deceleration and the actual deceleration;
the judging module 104 is configured to judge whether the difference is greater than or equal to a first preset value;
and the alarm module 105 is used for sending alarm information to a whole vehicle instrument if the difference value is greater than or equal to the first preset value, and the electric power-assisted brake system breaks down.
Alternatively, as shown in fig. 8, the target deceleration obtaining module 101 includes:
a target deceleration obtaining submodule 1011 for obtaining an average value of the target deceleration of the vehicle;
the actual deceleration obtaining module 102 includes:
an actual deceleration obtaining submodule 1021 for obtaining an average value of the actual deceleration of the vehicle;
the calculation module 103 includes:
a calculation sub-module 1031 for calculating a difference between the average value of the target deceleration of the vehicle and the average value of the actual deceleration of the vehicle.
Optionally, the target deceleration obtaining sub-module 1011 is configured to obtain N target decelerations, sum and divide the N target decelerations by N to obtain an average value of the target decelerations of the vehicle;
an actual deceleration obtaining submodule 1021 for obtaining N actual decelerations, summing the N actual decelerations and dividing by N to obtain an average value of the actual decelerations of the vehicle; wherein N is more than or equal to 2 and is a positive integer.
Alternatively, as shown in fig. 8, the control device of the electric power assisted brake system further includes:
the vehicle speed module 106 is used for acquiring the vehicle speed of the vehicle;
a second determination module 107 for calculating a difference between the target deceleration and the actual deceleration if the vehicle speed of the vehicle is greater than or equal to a second preset value;
and if the vehicle speed of the vehicle is less than the second preset value, continuously acquiring the vehicle speed of the vehicle.
Alternatively, as shown in fig. 8, the control device of the electric power assisted brake system further includes:
the vehicle control state acquisition module 108 is used for acquiring the vehicle control state of the vehicle;
and a third determination module 109 for calculating a difference between the target deceleration and the actual deceleration if the entire vehicle control state of the vehicle is in a steady state.
Alternatively, as shown in fig. 8, the control device of the electric power assisted brake system further includes:
a brake pedal opening obtaining module 110, configured to obtain a brake pedal opening;
a fourth judgment module 111, configured to calculate a difference between the target deceleration and the actual deceleration if the brake pedal opening is greater than or equal to a fourth preset value;
and if the opening degree of the brake pedal is smaller than the fourth preset value, continuously acquiring the opening degree of the brake pedal.
Alternatively, as shown in fig. 8, the control device of the electric power assisted brake system further includes:
a counting module 112, configured to count the number of failures at a preset time interval if the difference is greater than or equal to a first preset value;
the fifth judging module 113 is configured to send alarm information to the vehicle instrument when the continuous count value is greater than or equal to a fifth preset value and the electric power assisting system fails;
and the clearing counting module 114 is used for clearing counting when the continuous counting value is smaller than the fifth preset value, and restarting to count the failure times at preset time intervals.
Optionally, the alarm module 105 is configured to control an alarm lamp of the vehicle instrument to flash and/or control a buzzer of the vehicle instrument to buzz.
The embodiment of the third aspect of the invention also provides a vehicle, which comprises the control device of the electric power-assisted brake system.
The product can execute the method provided by any embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method.
In summary, according to the control method, the control device and the vehicle of the electric power-assisted brake system provided by the embodiment of the invention, firstly, the target deceleration of the vehicle is obtained, and the actual deceleration of the vehicle is obtained; then calculating a difference between the target deceleration and the actual deceleration; then judging whether the difference value is greater than or equal to a first preset value; if the difference value is larger than or equal to the first preset value, the electric power-assisted braking system breaks down and sends alarm information to a whole vehicle instrument, so that when the vehicle is in an under-load state, a driver is warned in an early mode, the driver can take corresponding measures, and driving danger is avoided.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (10)
1. A control method of an electric power-assisted brake system is characterized by comprising the following steps:
acquiring a target deceleration of the vehicle;
acquiring an actual deceleration of the vehicle;
calculating a difference between the target deceleration and the actual deceleration;
judging whether the difference value is greater than or equal to a first preset value;
and if the difference value is larger than or equal to a first preset value, the electric power-assisted braking system breaks down, and alarm information is sent to a whole vehicle instrument.
2. The control method of an electric power assisted brake system according to claim 1, characterized in that the obtaining of the target deceleration of the vehicle includes:
acquiring an average value of a target deceleration of the vehicle;
the acquiring the actual deceleration of the vehicle includes:
obtaining an average value of an actual deceleration of the vehicle;
calculating the difference between the target deceleration and the actual deceleration includes:
a difference between the average value of the target deceleration of the vehicle and the average value of the actual deceleration of the vehicle is calculated.
3. The control method of an electric power assisted brake system according to claim 2, characterized in that obtaining an average value of the target deceleration of the vehicle includes:
acquiring N target decelerations, summing the N target decelerations and dividing the N target decelerations by N to acquire an average value of the target decelerations of the vehicle;
the obtaining of the average value of the actual deceleration of the vehicle includes:
acquiring N actual decelerations, summing the N actual decelerations and dividing the N actual decelerations by N to acquire an average value of the actual decelerations of the vehicle; wherein N is more than or equal to 2 and is a positive integer.
4. The control method of an electric power assisted brake system according to claim 1 or 2, characterized by, before the calculating the difference between the target deceleration and the actual deceleration, further comprising:
acquiring the speed of the vehicle;
calculating a difference between the target deceleration and the actual deceleration if the vehicle speed of the vehicle is greater than or equal to a second preset value;
and if the vehicle speed of the vehicle is less than a second preset value, returning to the step of acquiring the vehicle speed of the vehicle.
5. The control method of an electric power assisted brake system according to claim 4, characterized by, before the calculating the difference between the target deceleration and the actual deceleration, further comprising:
acquiring the whole vehicle control state of the vehicle;
if the entire vehicle control state of the vehicle is in a steady state, a difference between the target deceleration and the actual deceleration is calculated.
6. The control method of an electric power assisted brake system according to claim 5, characterized by, before the calculating the difference between the target deceleration and the actual deceleration, further comprising:
acquiring the opening degree of a brake pedal;
calculating a difference between the target deceleration and the actual deceleration if the brake pedal opening degree is greater than or equal to a fourth preset value;
and if the opening degree of the brake pedal is smaller than a fourth preset value, returning to the step of obtaining the opening degree of the brake pedal.
7. The method for controlling the electric power-assisted brake system according to claim 1, wherein before the electric power-assisted system fails and sends alarm information to a vehicle instrument, the method further comprises:
if the difference value is larger than or equal to the first preset value, counting the number of faults at preset time intervals;
when the continuous counting value is larger than or equal to a fifth preset value, the electric power-assisted system breaks down and sends alarm information to a whole vehicle instrument;
and clearing the counting when the continuous counting value is smaller than the fifth preset value, and restarting the step of counting the failure times at the interval preset time.
8. The method for controlling the electric power-assisted brake system according to claim 1, wherein the step of sending alarm information to a vehicle instrument when the electric power-assisted brake system fails comprises the steps of:
and controlling an alarm lamp of the whole vehicle instrument to flash and/or controlling a buzzer of the whole vehicle instrument to buzz.
9. A control device of an electric power assisted brake system, characterized by comprising:
a target deceleration obtaining module for obtaining a target deceleration of the vehicle;
an actual deceleration obtaining module for obtaining an actual deceleration of the vehicle;
a calculation module for calculating a difference between the target deceleration and the actual deceleration;
the judging module is used for judging whether the difference value is larger than or equal to a first preset value or not;
and the alarm module is used for sending alarm information to a whole vehicle instrument if the difference value is greater than or equal to a first preset value and the electric power-assisted brake system fails.
10. A vehicle characterized by comprising the control device of the electric power assisted brake system according to claim 9.
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| CN202010921773.9A CN112026738A (en) | 2020-09-04 | 2020-09-04 | Control method and device of electric power-assisted brake system and vehicle |
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| CN202010921773.9A CN112026738A (en) | 2020-09-04 | 2020-09-04 | Control method and device of electric power-assisted brake system and vehicle |
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