CN102849059B - Electronic parking braking method and braking releasing method - Google Patents
Electronic parking braking method and braking releasing method Download PDFInfo
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- CN102849059B CN102849059B CN201110177777.1A CN201110177777A CN102849059B CN 102849059 B CN102849059 B CN 102849059B CN 201110177777 A CN201110177777 A CN 201110177777A CN 102849059 B CN102849059 B CN 102849059B
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Abstract
The invention discloses an electronic parking braking method, which comprises the following steps of: an electronic control unit receives a braking instruction; the electronic control unit controls a motor to be electrified and started, and simultaneously drives a screw to rotate, so that a barrel pushes a piston to move towards the direction of a friction plate; and when a motor current collected by the electronic control unit reaches a first preset current value I1, the electronic control unit controls the motor to stop rotating. The invention also discloses an electronic parking braking releasing method, which comprises the following steps of: the electronic control unit receives a braking releasing instruction; the electronic control unit controls the motor to be electrified and started, and simultaneously drives the screw to move away from the direction of the friction plate; and when the motor current collected by the electronic control unit reaches a second preset current value I2, a second preset time is delayed, and the electronic control unit controls the motor to stop rotating. The electronic parking braking method and braking releasing method disclosed by the invention do not need additional hardware, but have high working efficiency, and can save energy.
Description
Technical field
The invention belongs to car brakeing field, be specifically related to a kind of electronic parking braking method and brake off method.
Background technology
Along with the continuous progress of auto technology, increasing automobile gradually becomes electronic type from traditional Mechanical course and controls, and electronic brake system utilizes electric energy to realize the function of traditional emergency brake system.Existing electronic brake system as shown in Figure 1, generally comprise ECU (Electrical Control Unit) (not shown), motor 1, for subtracting motor speed, increasing the drive assembly 2 of motor output torque, screw rod 3, swivel nut 4, piston 5 and friction lining (friction lining is not shown in FIG.), when vehicle need be braked, ECU (Electrical Control Unit) controls motor and rotates forward, drive bolt rotary to make swivel nut push piston to move toward the direction of friction lining simultaneously, thus control the braking of friction lining; And when vehicle needs brake off, ECU (Electrical Control Unit) controls motor reversal, drive bolt rotary to retreat, until piston does not have pressure, and produce some gaps and stop, now piston just can not have application force to friction lining, namely reaches the brake off of vehicle simultaneously.
Braking and brake off is realized well in order to make above-mentioned existing brake system, there has been following two kinds of electronic brake systems, the first is, the basis of existing electronic brake system adds the rotation number of turns motor speed sensor for directly measuring motor, like this when car brakeing and brake off, ECU (Electrical Control Unit) passes through surveyed turning collar numerical control motor stalls.The method not only makes hardware configuration complicated, adds cost, and, the wheel place natively very little in position, not too applicable; Second method is, limit point is provided with between screw rod and swivel nut, namely vehicle is when brake off, and swivel nut need be got back to limit point rear motor and could stop, but along with the wearing and tearing of friction lining, its thickness is more and more thinner, swivel nut is then made to get back to the stroke of limit point also more and more longer, in like manner, the stroke spent when also increasing braking next time, because this increasing the work-hours of motor, waste the energy.
Summary of the invention
For solving the above-mentioned technical matters that existing electronic brake system exists, providing one does not need additionally to increase hardware and work efficiency is high, energy-conservation electronic parking braking method and brake off method.
Technical scheme of the present invention is:
A kind of electronic parking braking method, comprises the following steps:
Step S1: ECU (Electrical Control Unit) receives braking instruction;
Step S2: ECU (Electrical Control Unit) controls electrical power and starts, drives bolt rotary to make swivel nut push piston simultaneously and moves toward the direction of friction lining, when the current of electric of ECU (Electrical Control Unit) collection reaches the first pre-set current value I1, controls motor stalls.
Further, current value when described first pre-set current value I1 can provide needed for vehicle for motor maximum parking power.
Further, described step S2 is specially:
ECU (Electrical Control Unit) controls electrical power and starts, drive bolt rotary to make swivel nut push piston to move toward the direction of friction lining simultaneously, and ECU (Electrical Control Unit) when reaching the second pre-set current value I2 from current of electric timing, when current of electric reaches the first pre-set current value I1, record timing time t;
ECU (Electrical Control Unit) judges whether this time t is less than or equal to the first Preset Time, when this time, t was less than or equal to the first Preset Time, explanation has hydraulic efficiency pressure system to participate in braking, ECU (Electrical Control Unit) controls motor stalls, and ECU (Electrical Control Unit) is when detecting that hydraulic efficiency pressure system has neither part nor lot in work, control motor to be again energized startings, and when current of electric reaches the first pre-set current value I1 again, stopping electric machine rotation;
When this time, t was greater than the first Preset Time, illustrate that then ECU (Electrical Control Unit) controls motor stalls without hydraulic pressure participation braking.
Further, described first Preset Time is 0.8s-1.2s, described second pre-set current value I2 is less than or equal to 5/3 of motor idle electric current value, and the second pre-set current value I2 is at current of electric corresponding to t1 moment, wherein at the variable quantity of the time period current of electric of t1-1ms-t1 within the scope of 0.02A-0.03A.
A kind of electronic parking brake off method, comprises the following steps:
Step T1: ECU (Electrical Control Unit) receives brake off instruction;
Step T2: ECU (Electrical Control Unit) controls electrical power and starts, drives screw rod to move to the direction away from friction lining simultaneously, when the current of electric of ECU (Electrical Control Unit) collection reaches the second pre-set current value I2, after time delay second Preset Time, controls motor stalls.
Further, described second pre-set current value I2 is less than or equal to 5/3 of motor idle electric current value, and the second pre-set current value I2 is at current of electric corresponding to t1 moment, wherein at the variable quantity of the time period current of electric of t1-1ms-t1 within the scope of 0.02A-0.03A; Described second Preset Time is 0.7s-1s.
Further, described step T2 is specially:
ECU (Electrical Control Unit) controls electrical power and starts, and drives screw rod to move to the direction away from friction lining simultaneously, and ECU (Electrical Control Unit) timing from electric motor starting, when current of electric reaches the second pre-set current value I2, record timing time s;
ECU (Electrical Control Unit) judges whether this time s is less than or equal to the 3rd Preset Time, and when this time, s was less than or equal to the 3rd Preset Time, illustrated that hydraulic efficiency pressure system participates in braking, ECU (Electrical Control Unit) stops operating after controlling motor time delay the 4th Preset Time;
When this time, s was greater than the second Preset Time, illustrate that then ECU (Electrical Control Unit) stops operating after controlling motor time delay the 5th Preset Time without hydraulic pressure participation braking.
Further, described 3rd Preset Time is 0.5s-0.9s, and described 4th Preset Time gets the difference of time a and time s, and described 5th Preset Time is 0.3s-0.4s, and wherein, time a is 1.2s-1.5s.
Advantage of the present invention: from the technical scheme of above-mentioned electronic parking braking method and brake off method, during braking, when the current of electric of ECU (Electrical Control Unit) collection reaches the first pre-set current value I1, control motor stalls, and during brake off, when the current of electric of ECU (Electrical Control Unit) collection reaches the second pre-set current value I2, after time delay second Preset Time, control motor stalls.Relative to prior art, the scheme of this braking and brake off does not only need to increase extra hardware, decrease system cost, and no matter whether friction lining weares and teares, according to the method for braking of the present invention and brake off, all can be issued to the object of braking and brake off in the prerequisite not extending braking and minimizing brake off stroke, therefore, relative to prior art, it is high that the present invention also has work efficiency, and energy-conservation effect.
Accompanying drawing explanation
Fig. 1 is the structural representation of existing electronic brake system.
The method flow diagram that Fig. 2 provides for electronic parking braking method of the present invention.
The method flow diagram of the preferred embodiment that Fig. 3 provides for electronic parking braking method of the present invention.
The method flow diagram that Fig. 4 provides for electronic parking brake off method of the present invention.
The method flow diagram of the preferred embodiment that Fig. 5 provides for electronic parking brake off method of the present invention.
Detailed description of the invention
In order to make technical matters solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Existing electronic brake system is when braking or brake off, the general rotation number of turns being measured motor by the motor speed sensor set up, or specifically determining to stop the exact time of electric machine rotation by being provided with limit point (scape technology of specifically passing away part) between screw rod and swivel nut, namely reaching the object of braking or brake off.But, not only make hardware configuration complicated by the method for setting up motor speed sensor, add cost, and, the wheel place natively very little in position, not too applicable; By being provided with the method for limit point between screw rod and swivel nut, because vehicle is when brake off, swivel nut need be got back to limit point rear motor and could stop, therefore along with the wearing and tearing of friction lining, its thickness is more and more thinner, then make swivel nut get back to the stroke of limit point also more and more longer, in like manner, the stroke spent when also increasing braking next time, namely adds the work-hours of motor, wastes the energy.
Applicant of the present invention, on existing electronic brake system basis, have passed through research many times, and finally invented one electronic parking braking method and brake off method better, its concrete technical scheme is as described below:
A kind of electronic parking braking method, comprises the following steps:
Step S1: ECU (Electrical Control Unit) receives braking instruction;
Step S2: ECU (Electrical Control Unit) controls electrical power and starts, drives bolt rotary to make swivel nut push piston simultaneously and moves toward the direction of friction lining, when the current of electric of ECU (Electrical Control Unit) collection reaches the first pre-set current value I1, controls motor stalls.
A kind of electronic parking brake off method, comprises the following steps:
Step T1: ECU (Electrical Control Unit) receives brake off instruction;
Step T2: ECU (Electrical Control Unit) controls electrical power and starts, drives screw rod to move to the direction away from friction lining simultaneously, when the current of electric of ECU (Electrical Control Unit) collection reaches the second pre-set current value I2, after time delay second Preset Time, controls motor stalls.
From such scheme, electronic parking braking method of the present invention and brake off method are determined when by the size of motor current value to stop electric machine rotation, when namely braking, when the current of electric of ECU (Electrical Control Unit) collection reaches the first pre-set current value I1, control motor stalls; During brake off, when the current of electric of ECU (Electrical Control Unit) collection reaches the second pre-set current value I2, after time delay second Preset Time, control motor stalls.Like this relative to prior art, the scheme of this braking and brake off does not only need to increase extra hardware, decrease system cost, and no matter whether friction lining weares and teares, according to the method for braking of the present invention and brake off, all can be issued to the object of braking and brake off in the prerequisite not extending braking and minimizing brake off stroke, therefore, relative to prior art, it is high that the present invention also has work efficiency, and energy-conservation effect.
Understand well to make those skilled in the art and realize technical scheme of the present invention, describing technology contents of the present invention below in conjunction with accompanying drawing in detail with the form of specific embodiment.
As shown in Figure 2, electronic parking braking method comprises the following steps:
Step S1: ECU (Electrical Control Unit) receives braking instruction;
Be understandable that, braking instruction herein can by chaufeur manually or foot operation do, such as, when the vehicle is stopped, click parking switch P, namely to ECU (Electrical Control Unit) export braking instruction.
Step S2: ECU (Electrical Control Unit) controls electrical power and starts, drives bolt rotary to make swivel nut push piston simultaneously and moves toward the direction of friction lining, when the current of electric of ECU (Electrical Control Unit) collection reaches the first pre-set current value I1, controls motor stalls.
Will be understood that, above-mentioned first pre-set current value I1 is current value when motor can provide the maximum parking power needed for vehicle, and it is obtained by many experiments, and stored in ECU (Electrical Control Unit).
Existing vehicle, the independent employing electronic brake had, and some vehicles, when electronic brake, hydraulic efficiency pressure system also participates in having braked.But, after parking terminates, chaufeur also have left vehicle, and namely hydraulic braking is just cancelled automatically, electronic brake is now then needed to realize separately braking, otherwise may bring and slip the serious consequence of car, therefore, in order to the different braking method adopted for vehicle parking, all safety arrestment can be realized, the invention provides one preferably electronic parking braking method, as shown in Figure 3, the method comprises the following steps:
Step 21: ECU (Electrical Control Unit) receives braking instruction;
Step 22: ECU (Electrical Control Unit) controls electrical power and starts, drive bolt rotary to make swivel nut push piston to move toward the direction of friction lining simultaneously, and ECU (Electrical Control Unit) when reaching the second pre-set current value I2 from current of electric timing, when current of electric reaches the first pre-set current value I1, record timing time t;
It should be noted that, timing time t herein refers to current of electric timing from the second pre-set current value I2, until accumulation timing time during the first pre-set current value I1.
Step 23: judge whether this time t is less than or equal to the first Preset Time, when this time, whether t was less than or equal to the first Preset Time, has illustrated that hydraulic efficiency pressure system participates in braking, has performed step 24, otherwise illustrated that non-hydraulic system participates in braking, performed step 25;
Step 24: ECU (Electrical Control Unit) controls motor stalls, and when ECU (Electrical Control Unit) detects that hydraulic efficiency pressure system has neither part nor lot in braking, controls motor and to be again energized starting, and when current of electric reaches the first pre-set current value I1 again, stopping electric machine rotation, process ends;
Be understandable that, by existing multiple method, above-mentioned ECU (Electrical Control Unit) detects whether hydraulic efficiency pressure system participates in braking, such as by detecting the signal whether participating in braking that hydraulic efficiency pressure system self sends, or by detecting the action etc. of brake pedal, not doing at this and introducing one by one.
Step 25: ECU (Electrical Control Unit) controls motor stalls.
Be understandable that, above-mentioned first pre-set current value I1 is current value when motor can provide the maximum parking power needed for vehicle; Above-mentioned first Preset Time refers to the braking time needed for the electronic brake not having hydraulic efficiency pressure system to participate in, and it is preferably 0.8s-1.2s; Above-mentioned second pre-set current value I2 is less than or equal to 5/3 of motor idle electric current value, and the second pre-set current value I2 is at current of electric corresponding to t1 moment, wherein at the variable quantity of the time period current of electric of t1-1ms-t1 within the scope of 0.02A-0.03A.Above-mentioned first pre-set current value I1, the second pre-set current value I2 and the first Preset Time are all obtained by many experiments, and all stored in ECU (Electrical Control Unit).It should be noted that at this, above-mentioned motor idle electric current value refer to motor not bringing onto load time the current value that rotates.
As shown in Figure 4, a kind of electronic parking brake off method, comprises the following steps:
Step T1: ECU (Electrical Control Unit) receives brake off instruction;
Be understandable that, brake off instruction herein can by chaufeur manually or foot operation do, such as when the engine is started, while stepping on brake pedal, click switch P, namely export brake off instruction to ECU (Electrical Control Unit).
Step T2: ECU (Electrical Control Unit) controls electrical power and starts, drives screw rod to move to the direction away from friction lining simultaneously, when the current of electric of ECU (Electrical Control Unit) collection reaches the second pre-set current value I2, after time delay second Preset Time, controls motor stalls.
Be understandable that, above-mentioned second pre-set current value I2 is less than or equal to 5/3 of motor idle electric current value, and the second pre-set current value I2 is at current of electric corresponding to t1 moment, wherein at the variable quantity of the time period current of electric of t1-1ms-t1 within the scope of 0.02A-0.03A, above-mentioned second Preset Time is 0.7s-1s.Above-mentioned second pre-set current value I2 and the second Preset Time are all obtained by many experiments, and all stored in ECU (Electrical Control Unit).
In like manner, existing vehicle is when electronic parking removes car braking, hydraulic efficiency pressure system is likely had to participate in, hydraulic efficiency pressure system is not likely had to participate in braking, therefore, in order to the different braking method (namely having the brake off method that hydraulic efficiency pressure system participates in or do not have hydraulic efficiency pressure system to participate in) adopted for vehicle brake off, all can realize fully brake off function, the invention provides a kind of method of preferred electronic parking brake off, as shown in Figure 5, the method comprises the following steps:
Step 41: ECU (Electrical Control Unit) receives brake off instruction;
Step 42: ECU (Electrical Control Unit) controls electrical power and starts, drive screw rod to move to the direction away from friction lining, ECU (Electrical Control Unit) is timing from electric motor starting simultaneously, when current of electric reaches the second pre-set current value I2, record timing time s;
It should be noted that, timing time s herein refers to timing from electric motor starting, until current of electric is to accumulation timing time during the first pre-set current value I1.
Step 43: judge whether be less than or equal to the 3rd Preset Time as this time s, when this time, s was less than or equal to the 3rd Preset Time, has illustrated that hydraulic efficiency pressure system participates in braking, has performed step 44, otherwise illustrated that non-hydraulic system participates in braking, performed step 45;
Step 44: ECU (Electrical Control Unit) stops operating after controlling motor time delay the 4th Preset Time, process ends;
Step 45: ECU (Electrical Control Unit) stops operating after controlling motor time delay the 5th Preset Time.
Be understandable that, above-mentioned second pre-set current value I2 is less than or equal to 5/3 of motor idle electric current value, and the second pre-set current value I2 is at current of electric corresponding to t1 moment, wherein at the variable quantity of the time period current of electric of t1-1ms-t1 within the scope of 0.02A-0.03A; Above-mentioned second Preset Time is 0.7s-1s, above-mentioned 3rd Preset Time refers to the electronic parking brake off not having hydraulic efficiency pressure system to participate in, the time needed for the second pre-set current value I2 is reached from electric motor starting to current of electric, it is preferably 0.5s-0.9s, above-mentioned 4th Preset Time gets the difference of time a and time s, above-mentioned 5th Preset Time is 0.3s-0.4s, and wherein, time a is 1.2s-1.5s.Be understandable that, above-mentioned second pre-set current value I2, the second Preset Time, the 3rd Preset Time, the 4th Preset Time and the 5th Preset Time are all obtained by many experiments, and all stored in ECU (Electrical Control Unit).
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (6)
1. an electronic parking braking method, is characterized in that, comprises the following steps:
Step S1: ECU (Electrical Control Unit) receives braking instruction;
Step S2: ECU (Electrical Control Unit) controls electrical power and starts, drive bolt rotary to make swivel nut push piston to move toward the direction of friction lining simultaneously, and ECU (Electrical Control Unit) when reaching the second pre-set current value I2 from current of electric timing, when current of electric reaches the first pre-set current value I1, record timing time t;
ECU (Electrical Control Unit) judges whether this time t is less than or equal to the first Preset Time, when this time, t was less than or equal to the first Preset Time, explanation has hydraulic efficiency pressure system to participate in braking, ECU (Electrical Control Unit) controls motor stalls, and ECU (Electrical Control Unit) is when detecting that hydraulic efficiency pressure system has neither part nor lot in work, control motor to be again energized starting, and when current of electric reaches the first pre-set current value I1 again, stop electric machine rotation, wherein, the first Preset Time refers to the braking time needed for the electronic brake not having hydraulic efficiency pressure system to participate in;
When this time, t was greater than the first Preset Time, illustrate that then ECU (Electrical Control Unit) controls motor stalls without hydraulic pressure participation braking.
2. electronic parking braking method according to claim 1, is characterized in that, described first pre-set current value I1 is current value when motor can provide the maximum parking power needed for vehicle.
3. electronic parking braking method according to claim 2, it is characterized in that, described first Preset Time is 0.8s-1.2s, described second pre-set current value I2 is less than or equal to 5/3 of motor idle electric current value, and the second pre-set current value I2 is at current of electric corresponding to t1 moment, wherein at the variable quantity of the time period current of electric of t1-1ms-t1 within the scope of 0.02A-0.03A.
4. an electronic parking brake off method, is characterized in that, comprises the following steps:
Step T1: ECU (Electrical Control Unit) receives brake off instruction;
Step T2: ECU (Electrical Control Unit) controls electrical power and starts, drives screw rod to move to the direction away from friction lining simultaneously, and ECU (Electrical Control Unit) timing from electric motor starting, when current of electric reaches the second pre-set current value I2, record timing time s;
ECU (Electrical Control Unit) judges whether this time s is less than or equal to the 3rd Preset Time, when this time, s was less than or equal to the 3rd Preset Time, explanation has hydraulic efficiency pressure system to participate in braking, ECU (Electrical Control Unit) stops operating after controlling motor time delay the 4th Preset Time, wherein, 3rd Preset Time refers to the electronic parking brake off not having hydraulic efficiency pressure system to participate in, and reaches the time needed for the second pre-set current value I2 from electric motor starting to current of electric;
When this time, s was greater than the second Preset Time, illustrate that then ECU (Electrical Control Unit) stops operating after controlling motor time delay the 5th Preset Time without hydraulic pressure participation braking.
5. electronic parking brake off method according to claim 4, it is characterized in that, described second pre-set current value I2 is less than or equal to 5/3 of motor idle electric current value, and the second pre-set current value I2 is at current of electric corresponding to t1 moment, wherein at the variable quantity of the time period current of electric of t1-1ms-t1 within the scope of 0.02A-0.03A; Described second Preset Time is 0.7s-1s.
6. electronic parking brake off method according to claim 5, is characterized in that, described 3rd Preset Time is 0.5s-0.9s, described 4th Preset Time gets the difference of time a and time s, described 5th Preset Time is 0.3s-0.4s, and wherein, time a is 1.2s-1.5s.
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| CN201110177777.1A CN102849059B (en) | 2011-06-29 | 2011-06-29 | Electronic parking braking method and braking releasing method |
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| CN201110177777.1A CN102849059B (en) | 2011-06-29 | 2011-06-29 | Electronic parking braking method and braking releasing method |
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| CN102849059B true CN102849059B (en) | 2015-06-24 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107264489B (en) * | 2017-05-17 | 2019-08-23 | 广汽本田汽车有限公司 | Emergency release method and device for electronic brake system |
| CN109649366B (en) * | 2018-12-11 | 2020-02-14 | 湖南三一智能控制设备有限公司 | Sliding vehicle braking method, sliding vehicle braking device and vehicle |
| CN110509855B (en) * | 2019-08-19 | 2022-01-07 | 一汽解放汽车有限公司 | Flexible footboard device and vehicle |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391603A (en) * | 2008-10-27 | 2009-03-25 | 浙江亚太机电股份有限公司 | Electric-controlled unit for vehicle electric halt vehicle brake system |
| CN101823481A (en) * | 2010-03-31 | 2010-09-08 | 奇瑞汽车股份有限公司 | Electronic parking brake system and control method thereof |
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| JP4998344B2 (en) * | 2008-03-19 | 2012-08-15 | 株式会社アドヴィックス | Parking brake control device |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101391603A (en) * | 2008-10-27 | 2009-03-25 | 浙江亚太机电股份有限公司 | Electric-controlled unit for vehicle electric halt vehicle brake system |
| CN101823481A (en) * | 2010-03-31 | 2010-09-08 | 奇瑞汽车股份有限公司 | Electronic parking brake system and control method thereof |
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