CN104670203A - Control system and method for improving abnormal automobile start flutter noise based on driving force - Google Patents
Control system and method for improving abnormal automobile start flutter noise based on driving force Download PDFInfo
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- CN104670203A CN104670203A CN201510070420.1A CN201510070420A CN104670203A CN 104670203 A CN104670203 A CN 104670203A CN 201510070420 A CN201510070420 A CN 201510070420A CN 104670203 A CN104670203 A CN 104670203A
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- wheel speed
- vehicle
- starting
- flutter
- drive torque
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/04—Conjoint control of vehicle sub-units of different type or different function including control of propulsion units
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W10/00—Conjoint control of vehicle sub-units of different type or different function
- B60W10/18—Conjoint control of vehicle sub-units of different type or different function including control of braking systems
- B60W10/184—Conjoint control of vehicle sub-units of different type or different function including control of braking systems with wheel brakes
- B60W10/188—Conjoint control of vehicle sub-units of different type or different function including control of braking systems with wheel brakes hydraulic brakes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units, or advanced driver assistance systems for ensuring comfort, stability and safety or drive control systems for propelling or retarding the vehicle
- B60W30/18—Propelling the vehicle
- B60W30/20—Reducing vibrations in the driveline
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/06—Combustion engines, Gas turbines
- B60W2710/0666—Engine torque
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- B60W2710/00—Output or target parameters relating to a particular sub-units
- B60W2710/18—Braking system
- B60W2710/182—Brake pressure, e.g. of fluid or between pad and disc
Abstract
The invention relates to a control system and a control method for improving an abnormal automobile start flutter noise based on a driving force. The system is respectively connected with a braking pedal and a braking main cylinder, and is arranged on an automobile braking system and a power assembly or a driving force control system; the system comprises a braking force detection module, a start driving torque control module, wheel speed sensors, an engine, an automatic gearbox and a differential-decelerator assembly, wherein the wheel speed sensor is arranged on each automobile wheel; the engine, the automatic gearbox and the differential-decelerator assembly are sequentially connected in a transmission manner; the differential-decelerator assembly is connected with the automobile wheels; the start driving torque control module is respectively connected with the braking force detection module, the engine, the automatic gear and the wheel speed sensors. Compared with the prior art, the control system and the control method for improving the abnormal automobile start flutter noise based on the driving force have the advantages of significant effects, simple construction and low cost.
Description
Technical field
The present invention relates to brake system of car Control Technique of Vibration and Noise field, especially relate to a kind of control system and the method for improving vehicle starting flutter abnormal sound based on propulsive effort.
Background technology
Along with socioeconomic development, the raising of Living consumption, automobile is required for increasing user, and user also improves gradually for the requirement of automotive performance, meeting on the basic basis used, more and more values the vibration noise traveling comfort of automobile.
Automobile low speed starting Flutter Problem is a kind of vibration noise problem appearing at Automatic Transmission brake system of car, and its basic reason occurred is because brake friction material coefficient of static friction is greater than dynamic friction coefficient.The factor affecting automobile low speed starting flutter abnormal sound includes: the frictional behavior of friction material, the vibration characteristic of drg, the vibration characteristic of suspension system, the K & C characteristic of fore suspension and rear suspension, the attitude of suspension and the size of drive torque when starting to walk initial, if change the frictional behavior of friction material, then significantly can change the deceleration and stopping performance of vehicle, if change the vibration characteristic of drg or suspension system, then can have influence on other vibration noise performances of brake system, if change the K & C characteristic of fore suspension and rear suspension, then can have influence on the handling stability of vehicle.
When driver Automatic Transmission automobile remains static, and time release brake pedal makes automobile slowly start gradually, the lock torque exported due to drive torque and the brake system of now power drive system output can act on axle drive shaft simultaneously, cause friction pairs of brake position stick slip vibration can occur, affect the vibration noise traveling comfort of vehicular drive.
A large amount of theory and experimentation analysis shows, drive torque is larger, and so stick slip vibration is violent, and vehicle low speed starting flutter abnormal sound problem is obvious.So, need searching way, when ensureing that vehicle start does not slip by slope, delaying the output time of propulsive effort as far as possible, and reducing the size of propulsive effort.
Summary of the invention
Object of the present invention be exactly in order to overcome above-mentioned prior art exist defect and a kind of Be very effective, simple structure, with low cost control system and the method for improving vehicle starting flutter abnormal sound based on propulsive effort are provided.
Object of the present invention can be achieved through the following technical solutions:
A kind of control system improving vehicle starting flutter abnormal sound based on propulsive effort, this system is connected with brake pedal and master brake cylinder respectively, be arranged on brake system of car and dynamic assembly or Traction control system, this system comprises braking forces measuring module, starting drive torque control module, the driving engine being arranged on the wheel speed sensors on wheel and being in transmission connection successively, Automatic Transmission and subtract poor assembly, the described poor assembly that subtracts is connected with wheel, described starting drive torque control module respectively with braking forces measuring module, driving engine, Automatic Transmission is connected with wheel speed sensors.
Described braking forces measuring module comprises the displacement pickup be arranged on brake pedal and the hydraulic pressure transducer being arranged on master brake cylinder mouth, and described displacement pickup and hydraulic pressure transducer are connected with starting drive torque control module respectively.
Described starting drive torque control module comprises signal gathering unit, data processing unit and performance element, described signal gathering unit is connected with data processing unit, displacement pickup, hydraulic pressure transducer and wheel speed sensors respectively, and described performance element is connected with data processing unit, driving engine and Automatic Transmission respectively.
Improve a control method for vehicle starting flutter abnormal sound based on propulsive effort, comprise the following steps:
1) the drive torque control module that starts to walk obtains the wheel speed signal that wheel speed sensors records, and judges whether the wheel speed of vehicle is less than limit value e, and if so, then vehicle remains static, and carry out step 2), if not, then return step 1);
2) the drive torque control module that starts to walk obtains automobile braking force status signal by displacement pickup and hydraulic pressure transducer, judges that whether chaufeur demand braking force is higher than limit value P
1, if so, then automatic Automatic Transmission to be hung in neutral, and meet stablize the prerequisite of idling under reduce engine idle rotational 10%, then carry out step 3) if not, then return step 2);
3) judge that whether chaufeur demand braking force is lower than limit value P
2, and still constantly reduce, if so, then judge that chaufeur has starting intention, and automatically Automatic Transmission hung up driving shelves, carry out step 4), if not, then return step 3);
4) judge whether the wheel speed signal of wheel speed sensors reaches limit value V
0or whether demand braking force is lower than P
3, if so, then vehicle completes starting, and engine idle rotational is returned to normal value, if not, then returns step 4).
When the drive torque control module of starting to walk judge vehicle remain static and chaufeur do not start to walk intention time, if wheel speed sensors detects that wheel reverses, then judgement vehicle slips by slope, and Automatic Transmission is hung up driving shelves, and carry out step 4).
Described limit value e is the minimum measurement rotating speed of wheel speed sensors, described P
1the oil pressure producing master brake cylinder under 0.2g braking deceleration for making vehicle and produce, described P
2for MTP when vehicle idling is started to walk corresponding to the chatter phenomenon disappearance moment, described P
3span be P
2a thirtieth to two 1/10th, V of value
0for 40% of wheel speed when vehicle level land idling travels.
Compared with prior art, the present invention has the following advantages:
One, Be very effective: the present invention adopts the mode changing automatic transmission gear shift strategy and engine idle rotational, effectively reduce the chatter phenomenon of automobile low rate start, and can not affect the deceleration and stopping performance of automobile, handling stability can with other vibration noise performances.
Two, simple structure, with low cost: native system structure is simple, among the Traction control system (TCS) that can be integrated in multiple Powertrain control easily.
Accompanying drawing explanation
Fig. 1 is system architecture schematic diagram of the present invention.
Fig. 2 is control implementation result figure of the present invention.
Fig. 3 is embodiment of the present invention lumped parameter model schematic diagram.
Fig. 4 is the braking loading condition of the embodiment of the present invention.
Fig. 5 is that the embodiment of the present invention opens speed of a motor vehicle design sketch before and after system.
Fig. 6 is that the embodiment of the present invention opens system porpoise acceleration/accel design sketch.
Wherein, 1, displacement pickup, 2, hydraulic pressure transducer, 3, drive torque control module, 4, wheel speed sensors, 31, signal gathering unit, 32, data processing unit, 33, performance element, 51, driving engine, 52, Automatic Transmission, 53, poor assembly is subtracted.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.Should be understood that the present embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further illustrated.
Embodiment 1:
Below in conjunction with specific embodiment, set forth working process of the present invention and the mechanism of action further.Should be understood that the present embodiment is only not used in for illustration of the present invention to limit the scope of the invention.In addition should be understood that those skilled in the art can make various changes or modifications the present invention, and these equivalent form of values fall within the application's appended claims limited range equally after the content of having read the present invention's instruction.Below in conjunction with accompanying drawing illustrated embodiment, the present invention is further illustrated.
When driver Automatic Transmission automobile remains static, and time release brake pedal makes automobile slowly start gradually, the lock torque exported due to drive torque and the brake system of now power drive system output can act on axle drive shaft simultaneously, cause friction pairs of brake position stick slip vibration can occur, affect the vibration noise traveling comfort of vehicular drive.
A large amount of theory and experimentation analysis shows, drive torque is larger, and so stick slip vibration is violent, and vehicle low speed starting flutter abnormal sound problem is obvious.So, need searching way, when ensureing that vehicle start does not slip by slope, delaying the output time of propulsive effort as far as possible, and reducing the size of propulsive effort.
As shown in Figure 1, a kind of control system improving vehicle starting flutter abnormal sound based on propulsive effort, this system is connected with brake pedal and master brake cylinder respectively, this system comprises braking forces measuring module, starting drive torque control module 3, is arranged on the wheel speed sensors 4 on wheel and the driving engine 51 be in transmission connection successively, Automatic Transmission 52 and subtracts poor assembly 53, subtract poor assembly 53 to be connected with wheel, starting drive torque control module 3 is connected with braking forces measuring module, driving engine 51, Automatic Transmission 52 and wheel speed sensors 4 respectively.
Braking forces measuring module comprises the displacement pickup 1 be arranged on brake pedal and the hydraulic pressure transducer 2 being arranged on master brake cylinder mouth, and displacement pickup 1 and hydraulic pressure transducer 2 are connected with starting drive torque control module 3 respectively.
Starting drive torque control module 3 comprises signal gathering unit 31, data processing unit 32 and performance element 33, signal gathering unit 31 is connected with data processing unit 32, displacement pickup 1, hydraulic pressure transducer 2 and wheel speed sensors 4 respectively, and performance element 33 is connected with data processing unit 32, driving engine 51 and Automatic Transmission 52 respectively.
This system both can be installed on separately on brake system of car and dynamic assembly, can be integrated in again among some Traction control system that can realize Powertrain control (TCS).
For the automobile of an Automatic Transmission f-w-d, the control method of this control system specifically comprises the following steps:
1) the drive torque control module that starts to walk obtains the wheel speed signal that wheel speed sensors records, and judge whether the wheel speed of vehicle is less than limit value e, limit value e is the minimum measurement rotating speed of wheel speed sensors, if, then vehicle remains static, carry out step 2), if not, then return step 1);
2) the drive torque control module that starts to walk obtains automobile braking force status signal by displacement pickup and hydraulic pressure transducer, judges that whether chaufeur demand braking force is higher than limit value P
1, P
1the oil pressure producing master brake cylinder under 0.2g braking deceleration for making vehicle and produce, if so, then automatic Automatic Transmission to be hung in neutral, and meet stablize the prerequisite of idling under reduce engine idle rotational 10%, then carry out step 3) if not, then return step 2);
3) judge that whether chaufeur demand braking force is lower than limit value P
2, P
2for MTP when vehicle idling is started to walk corresponding to the chatter phenomenon disappearance moment, and still constantly reduce, if, then judge that chaufeur has starting intention, and automatically Automatic Transmission is hung up driving shelves, carry out step 4), if not, then step 3 is returned);
4) judge whether the wheel speed signal of wheel speed sensors reaches limit value V
0or whether demand braking force is lower than P
3, V
0for 40%, P of wheel speed when vehicle level land idling travels
3span be P
2a thirtieth of value, if so, then vehicle completes starting, and engine idle rotational is returned to normal value, if not, then returns step 4).
When the drive torque control module of starting to walk judge vehicle remain static and chaufeur do not start to walk intention time, if wheel speed sensors detects that wheel reverses, then judgement vehicle slips by slope, and Automatic Transmission is hung up driving shelves, and carry out step 4).
Embodiment 2:
In step 4) in, judge whether whether the wheel speed signal of wheel speed sensors reach limit value V0 or demand braking force lower than P3, V0 be vehicle level land idling when travelling wheel speed 40%, the span of P3 is 1/20th of P2 value, and if so, then vehicle completes starting, and engine idle rotational is returned to normal value, if not, then return step 4), all the other steps in the present embodiment are identical with embodiment 1.
Fig. 2 is the control implementation result figure of the inventive method, when brake-pressure is greater than limit value P
1, and when wheel speed is 0, judge stationary vehicle, hang neutral and turn down engine idle rotational, when brake-pressure is less than limit value P
2, and when still having downswing, judging that automobile is about to starting, change speed gear box is hung and is driven shelves, when wheel speed is more than V
0, judge that vehicle completes starting, engine idle rotational recovers normal.
In order to exceed under the prerequisite affecting automobile brake perfrmance, handling stability energy and vibration noise performance, improve automobile low speed starting flutter abnormal sound problem as far as possible, therefore proposing by changing the loading regime of drive torque, namely changing automatic transmission gear shift strategy and engine idle rotational and improving automobile low speed and to start to walk the Active Control Method of flutter abnormal sound.
Carry out simulation analysis to this control system as shown in Figure 3, this model is lumped parameter model, and vehicle is in the Automatic Transmission automobile of idling mode, if when braking force is 0, vehicle can continue to advance.By controlling braking force, can regulation speed, in simulation analysis, load damped condition as shown in Figure 4, total braking force is with the state assignment of brake-power balance coefficient 0.75 to antero posterior axis drg, and friction pair attribute is coefficient of static friction 0.45, dynamic friction coefficient 0.35.
Brake system loads braking force from 5s, and from 10s, wheel speed, lower than limit value e=5r/min, assert that vehicle remains static; And learn from brake-pressure sensor, brake-pressure is higher than limit value P
1=20kN, so according to step 2), change speed gear box is placed in N shelves and cuts off power, and engine speed is reduced by 10%, engine output torque declines.
56s rises, and braking force sensor detects brake-pressure lower than P
2=0.45kN, and the rate of change of brake-pressure is negative, assert that chaufeur has starting intention, change speed gear box is placed in D shelves, starts starting.
When vehicle is in 60s, brake-pressure sensor detects that brake-pressure is lower than P
3=0.02kN, assert that vehicle completes starting, engine speed returns to initial value.
Fig. 5 and Fig. 6 is before and after system is opened, and chatter phenomenon comparison diagram of starting to walk during starting, chooses x
vspeed and x
bfacceleration/accel, represent the vibration acceleration of the speed of a motor vehicle and drg, after can finding to open system, vehicle start is slightly delayed, but the starting chatter phenomenon of front brake is greatly improved.
Claims (6)
1. one kind is improved the control system of vehicle starting flutter abnormal sound based on propulsive effort, this system is connected with brake pedal and master brake cylinder respectively, it is characterized in that, this system comprises braking forces measuring module, starting drive torque control module (3), the driving engine (51) being arranged on the wheel speed sensors (4) on wheel and being in transmission connection successively, Automatic Transmission (52) and subtract poor assembly (53), the described poor assembly (53) that subtracts is connected with wheel, described starting drive torque control module (3) respectively with braking forces measuring module, driving engine (51), Automatic Transmission (52) is connected with wheel speed sensors (4),
Automobile is after stopping-down in start-up course, the signal that described starting drive torque control module (3) obtains wheel speed sensors (4) and braking forces measuring module respectively judges, improves vehicle starting flutter abnormal sound by reducing driving engine (51) idling speed and Automatic Transmission (52) being linked into neutral.
2. a kind of control system improving vehicle starting flutter abnormal sound based on propulsive effort according to claim 1, it is characterized in that, described braking forces measuring module comprises the displacement pickup (1) be arranged on brake pedal and the hydraulic pressure transducer (2) being arranged on master brake cylinder mouth, and described displacement pickup (1) and hydraulic pressure transducer (2) are connected with starting drive torque control module (3) respectively.
3. a kind of control system improving vehicle starting flutter abnormal sound based on propulsive effort according to claim 2, it is characterized in that, described starting drive torque control module (3) comprises signal gathering unit (31), data processing unit (32) and performance element (33), described signal gathering unit (31) respectively with data processing unit (32), displacement pickup (1), hydraulic pressure transducer (2) is connected with wheel speed sensors (4), described performance element (33) respectively with data processing unit (32), driving engine (51) is connected with Automatic Transmission (52).
4. the application control method improving the control system of vehicle starting flutter abnormal sound based on propulsive effort as claimed in claim 3, is characterized in that, comprise the following steps:
1) the drive torque control module that starts to walk obtains the wheel speed signal that wheel speed sensors records, and judges whether the wheel speed of vehicle is less than limit value e, and if so, then vehicle remains static, and carry out step 2), if not, then return step 1);
2) the drive torque control module that starts to walk obtains automobile braking force status signal by displacement pickup and hydraulic pressure transducer, judges that whether chaufeur demand braking force is higher than limit value P
1, if so, then automatic Automatic Transmission to be hung in neutral, and meet stablize the prerequisite of idling under reduce engine idle rotational 10%, then carry out step 3) if not, then return step 2);
3) judge that whether chaufeur demand braking force is lower than limit value P
2, and still constantly reduce, if so, then judge that chaufeur has starting intention, and automatically Automatic Transmission hung up driving shelves, carry out step 4), if not, then return step 3);
4) judge whether the wheel speed signal of wheel speed sensors reaches limit value V
0or whether demand braking force is lower than P
3, if so, then vehicle completes starting, and engine idle rotational is returned to normal value, if not, then returns step 4).
5. a kind of control method improving vehicle starting flutter abnormal sound based on propulsive effort according to claim 4, it is characterized in that, when the drive torque control module of starting to walk judge vehicle remain static and chaufeur do not start to walk intention time, if wheel speed sensors detects that wheel reverses, then judge that vehicle slips by slope, Automatic Transmission is hung up driving shelves, and carry out step 4).
6. a kind of control method improving vehicle starting flutter abnormal sound based on propulsive effort according to claim 4, is characterized in that, described limit value e is the minimum measurement rotating speed of wheel speed sensors, described P
1the oil pressure producing master brake cylinder under 0.2g braking deceleration for making vehicle and produce, described P
2for MTP when vehicle idling is started to walk corresponding to the chatter phenomenon disappearance moment, described P
3span be P
2a thirtieth to two 1/10th, V of value
0for 40% of wheel speed when vehicle level land idling travels.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510070420.1A CN104670203B (en) | 2015-02-10 | 2015-02-10 | It is a kind of to improve the control system and method for vehicle starting flutter abnormal sound based on driving force |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510070420.1A CN104670203B (en) | 2015-02-10 | 2015-02-10 | It is a kind of to improve the control system and method for vehicle starting flutter abnormal sound based on driving force |
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| Publication Number | Publication Date |
|---|---|
| CN104670203A true CN104670203A (en) | 2015-06-03 |
| CN104670203B CN104670203B (en) | 2017-08-25 |
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| CN201510070420.1A Active CN104670203B (en) | 2015-02-10 | 2015-02-10 | It is a kind of to improve the control system and method for vehicle starting flutter abnormal sound based on driving force |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107908871A (en) * | 2017-11-15 | 2018-04-13 | 同济大学 | A kind of braking chatter suppressing method based on chassis angle assembly Transient Dynamics |
| CN110015279A (en) * | 2017-12-27 | 2019-07-16 | 罗伯特·博世有限公司 | Brake NVH countermeasure |
| CN113911119A (en) * | 2021-11-05 | 2022-01-11 | 上海数脉科技有限责任公司 | Starting brake noise elimination system and method |
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| CN103419772A (en) * | 2013-08-29 | 2013-12-04 | 合肥工业大学 | Electric automobile starting system and control method thereof |
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| CN1322640A (en) * | 2000-05-09 | 2001-11-21 | 现代自动车株式会社 | Method for shifting into neutral gear with automatic governor at the time of first stopping speed |
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| Publication number | Publication date |
|---|---|
| CN104670203B (en) | 2017-08-25 |
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