CN201457349U - Electronic machinery hydraulic brake system of automobile - Google Patents
Electronic machinery hydraulic brake system of automobile Download PDFInfo
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- CN201457349U CN201457349U CN200920110660XU CN200920110660U CN201457349U CN 201457349 U CN201457349 U CN 201457349U CN 200920110660X U CN200920110660X U CN 200920110660XU CN 200920110660 U CN200920110660 U CN 200920110660U CN 201457349 U CN201457349 U CN 201457349U
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Abstract
The utility model relates to an electronic machinery hydraulic brake system of an automobile, which belongs to the technical field of automobile fabrication, and comprises four wheel brake actuating mechanisms, a brake operating mechanism, a front wheel speed sensor, a rear wheel speed sensor, an alarm lamp and an electronic control unit, wherein the four wheel brake actuating mechanisms are used for receiving the brake signal of the electronic control unit and realizing the braking to the wheels; the brake operating mechanism comprises a pedal sensation imitator and a pedal signal sensor, wherein the pedal sensation imitator is used to provide pedal sensation for a driver when the driver treads down a brake pedal, and the pedal signal sensor is used to collect the brake signal of the driver; the front wheel speed sensor and the rear wheel speed sensor are used for receiving the rotating speed signal of the wheel; the alarm lamp is used for receiving and displaying the alarm information of the electronic control unit; and the electronic control unit is used for calculating the brake force applied on each wheel according to various received signals. The electronic machinery hydraulic brake system has an independent wheel brake actuating mechanism for each wheel, has higher reliability, greatly reduces machinery reduction rate, has higher forward efficiency and reverse efficiency, is more convenient to control, and has excellent expandability.
Description
Technical field
The utility model relates to a kind of vehicle electromechanical hydraulic braking system, belongs to field of automobile.
Background technology
Along with the development of automotive technology, line control brake system becomes the development tendency of brake system of car gradually.In the moving system of On-line Control, the action that chaufeur is stepped on brake pedal only has the effect that braking intention signal is provided, and braking energy is directly provided by the energy source beyond the chaufeur.The brake efficiency of line control brake system has been cancelled the vacuum servo structure than the brake efficiency height of traditional braking system, has reduced the volume and weight of system, can realize initiatively braking, and convenient with following traffic control system network is connected.
At present, the technology of line control brake system is still immature, also is in the constantly perfect stage.The implementation of the brake-by-wire that proposes mainly contains two kinds at present: electro-hydraulic brake (EHB) and electric mechanical braking (EMB).They respectively have advantage, but also exist significantly not enough.The EHB system relies on high pressure accumulator to produce brake fluid pressure, in case high pressure accumulator lost efficacy, reveals as inner nitrogen, then can have a strong impact on the brake efficiency of brake system.The emergency brake system of EHB failure mode has not only increased the complexity of system, and owing to be the manpower hydraulic brake system, its brake efficiency is lower.The EMB system does not have braking liquid, is pure electromechanical braking system.The implementation that EMB generally takes is to rely on wheel motor to drive a cover planetary gear speed-reduction to increase and turn round mechanism, a cover conversion of motion mechanism, a cover lever boosting mechanism and directly slipper is pressed onto and produces braking force on the brake disc.Because this three cover slows down and to increase the existence of turning round mechanism, the mechanical reduction of EMB system is bigger than very, this will reduce system just, adverse efficiency, thereby require motor to have bigger power, increased the weight of system, power supply is also had higher requirement.In addition, big mechanical reduction than also can make system just, adverse efficiency has bigger gap (adverse efficiency is less than forward efficiency), thereby the hesitation of aggravation mechanical system input and output has reduced the system linearity degree, has strengthened the difficulty of control.In addition, owing to do not re-use hydraulic braking, traditional drg can not continue to use in EMB, must the new drg of exploitation.
Deficiency based on existing line control brake system, the utility model proposes new line control brake system: the electric mechanical hydraulic brake system, this system learns from other's strong points to offset one's weaknesses to the system of EHB and EMB, comprehensive advantage between the two, reliability can either be guaranteed, the power requirement of braking can be reached again.
Summary of the invention
The purpose of this utility model is to propose a kind of vehicle electromechanical hydraulic braking system, change the structure of existing automobile line control brake system, it is compared with the EHB system of existing employing high pressure accumulator have higher reliability, compare with existing EMB system and to have higher mechanical efficiency, and system linear degree height, control are convenient, still can use under existing drg and vehicle power.
The vehicle electromechanical hydraulic braking system that the utility model proposes comprises:
Four wheel braking actuating units are used to receive the speed-slackening signal of electronic control unit, and realize the braking to wheel, and the wheel braking actuating unit links to each other with electronic control unit by supply line; Four wheel braking actuating units are installed on the base plate of automobile body;
Brake operating mechanism, form by brake pedal, pedal sense simulator and pedal signal sensor, be used for after chaufeur is stepped on described brake pedal, pedal sense simulator provides the pedal sense similar to the traditional vacuum energy assisted braking system for chaufeur, pedal signal sensor acquisition chaufeur is stepped on the speed-slackening signal that described brake pedal produces, by electronic circuit this speed-slackening signal is passed to electronic control unit, brake operating mechanism is installed in vehicle driver's right crus of diaphragm downside;
Wheel speed sensors is used to receive the tach signal of wheel, and tach signal is sent to electronic control unit, and the wheel speed sensors of front-wheel is installed on the steering swivel, and the wheel speed sensors of trailing wheel is installed on the spindle nose of rear axle;
Steering wheel angle sensor is used for receive direction dish angular signal, and angular signal is sent to electronic control unit, is installed on the Steering gear;
Yaw-rate sensor is used to receive the yaw velocity signal, and the yaw velocity signal is sent to electronic control unit, is installed near the vehicle floor of vehicle barycenter.
The lateral acceleration sensor is used to receive lateral acceleration signal, and lateral acceleration signal is sent to electronic control unit, is installed together with yaw-rate sensor;
Alarm lamp is used to receive the alarm message of electronic control unit, and shows that alarm lamp is installed on the pilot dash board;
Electronic control unit is used to receive the driver pedal signal of pedal signal sensor acquisition, the wheel speed signal that wheel speed sensors is gathered, the angular signal that steering wheel angle sensor is gathered, the yaw velocity signal of yaw-rate sensor collection and the lateral acceleration signal of lateral acceleration sensor acquisition; Electronic control unit receives throttle signal, accelerator pedal signal, engine rotational speed signal and the engine torque signal of vehicle motor; Judge the braking intention of chaufeur according to pedal signal wherein, calculate the sliding ratio of wheel according to wheel speed signal wherein, judge the intention that turns to of chaufeur according to steering wheel angle signal wherein, calculate the yaw velocity size and the lateral acceleration size of vehicle according to wherein yaw velocity signal and lateral acceleration signal, throttle signal in conjunction with vehicle motor, accelerator pedal signal, engine rotational speed signal and engine torque signal, calculate the braking force that each wheel is applied, and control the voltage of the motor of each wheel braking actuating unit, and then control motor output torque; When system broke down, electronic control unit sent alarm message, made alarm lamp show that electronic control unit is installed in the vehicle engine compartments.
In the above-mentioned control system, described wheel braking actuating unit is made up of hydraulic pressure connecting line and drg between motor, big nut, ram seat, leading screw, push rod, piston, piston cylinder, piston cylinder and the drg, and described motor links to each other with described electronic control unit by supply line; The output shaft relative fixed of described leading screw and motor, the same axle mounting of leading screw, ram seat and piston cylinder, piston cylinder are fixed on the base plate of automobile body, are connected with drg by the hydraulic pressure connecting line; Described leading screw stretches in the ram seat, and described big nut and leading screw are meshing with each other, big nut and ram seat relative fixed; Ram seat links mutually by described push rod and described piston, and piston places piston cylinder.
The vehicle electromechanical hydraulic braking system that the utility model proposes, have the following advantages: each wheel all has separately independently wheel braking actuating unit, even certain wheel braking actuating unit lost efficacy, remaining wheel braking actuating unit still can be implemented braking insusceptibly, therefore compare with the EHB system that adopts high pressure accumulator, have higher reliability; The pure mechanical reduction of existing EMB system's employing increases the output torque of turning round mechanism's amplification motor provides braking force, wheel braking actuating unit of the present utility model then adopts mechanical reduction to increase to turn round mechanism and hydraulic efficiency pressure system together to amplify the output torque of motor, wherein mechanical reduction increases and turns round the rolling screw mechanism that mechanism has included only the motion transformation, therefore compare mechanical reduction than reducing greatly with existing EMB system, have just higher, adverse efficiency, requirement to power of motor is lower than EMB system, existing vehicle power still can use in the utility model, the system linearity degree is better than EMB system, control conveniently, and existing drg still can use in the utility model.In addition, brake system of the present utility model has favorable expansibility, function that can expanding system, by and intelligent transportation system (TMS) integrated, can realize the chassis Body Control, thereby reach the initiatively function of braking.Therefore the utlity model has good prospects for application.
Description of drawings
Fig. 1 is the structural representation of the utility model brake system.
Fig. 2 is the structural representation of brake actuator in the utility model brake system.
Among Fig. 1 and Fig. 2, the 1st, brake pedal, the 2nd, pedal sense simulator, the 3rd, pedal signal sensor, the 4th, wheel braking actuating unit, the 5th, sensor, wherein 51 is wheel speed sensors, the 52nd, and steering wheel angle sensor, the 53rd, yaw-rate sensor, the 54th, the lateral acceleration sensor, the 6th, alarm lamp, the 7th, motor, the 8th, big nut, the 9th, ram seat, the 10th, leading screw, the 11st, push rod, the 12nd, piston, the 13rd, piston cylinder, the 14th, the hydraulic pressure connecting line between piston cylinder and the drg, the 15th, drg (plate disc brake or drum brake mechanism), the 16th, piston packing ring, the 17th, bolt, the 18th, nut.
The specific embodiment
The vehicle electromechanical hydraulic braking system that the utility model proposes, its structure comprises as shown in Figure 1:
Four wheel braking actuating units 4 are used to receive the speed-slackening signal of electronic control unit, and realize the braking to wheel, and the wheel braking actuating unit links to each other with electronic control unit by supply line; Four wheel braking actuating units are installed on the base plate of automobile body;
Brake operating mechanism, form by brake pedal 1, pedal sense simulator 2 and pedal signal sensor 3, be used for after chaufeur is stepped on described brake pedal, pedal sense simulator 2 provides the pedal sense similar to the traditional vacuum energy assisted braking system for chaufeur, pedal signal sensor 3 is gathered chaufeur and is stepped on the speed-slackening signal that described brake pedal 1 produces, by electronic circuit this speed-slackening signal is passed to electronic control unit, brake operating mechanism is installed in vehicle driver's right crus of diaphragm downside;
Wheel speed sensors 51 is used to receive the tach signal of wheel, and tach signal is sent to electronic control unit, and the wheel speed sensors of front-wheel is installed on the steering swivel, and the wheel speed sensors of trailing wheel is installed on the spindle nose of rear axle;
Steering wheel angle sensor 52 is used for receive direction dish angular signal, and angular signal is sent to electronic control unit, is installed on the Steering gear;
Yaw-rate sensor 53 is used to receive the yaw velocity signal, and the yaw velocity signal is sent to electronic control unit, is installed near the vehicle floor of vehicle barycenter.
Alarm lamp 6 is used to receive the alarm message of electronic control unit, and shows that alarm lamp is installed on the pilot dash board;
Electronic control unit is used to receive driver pedal signal, the wheel speed signal that wheel speed sensors 51 is gathered, the angular signal that steering wheel angle sensor 52 is gathered, the yaw velocity signal of yaw-rate sensor 53 collections and the lateral acceleration signal that lateral acceleration sensor 54 is gathered that pedal signal sensor 3 is gathered; Electronic control unit receives throttle signal, accelerator pedal signal, engine rotational speed signal and the engine torque signal of vehicle motor; Judge the braking intention of chaufeur according to pedal signal wherein, calculate the sliding ratio of wheel according to wheel speed signal wherein, judge the intention that turns to of chaufeur according to steering wheel angle signal wherein, calculate the yaw velocity size and the lateral acceleration size of vehicle according to wherein yaw velocity signal and lateral acceleration signal, throttle signal in conjunction with vehicle motor, accelerator pedal signal, engine rotational speed signal and engine torque signal, calculate the braking force that each wheel is applied, and control the electric moter voltage of each wheel braking actuating unit, and then control motor output torque; When system broke down, electronic control unit sent alarm message, made alarm lamp show that electronic control unit is installed in the vehicle engine compartments.
In the utility model brake system, the structure of wheel braking actuating unit is made up of hydraulic pressure connecting line 14 between motor 7, big nut 8, ram seat 9, leading screw 10, push rod 11, piston 12, piston cylinder 13, piston cylinder and the drg and drg 15 as shown in Figure 2.Motor 7 links to each other with described electronic control unit by supply line.The output shaft relative fixed of leading screw 10 and motor, leading screw 10, ram seat 9 and piston cylinder 13 same axle mountings, piston cylinder 13 is fixed on the body bottom panel of vehicle, is connected with drg 15 by hydraulic pressure connecting line 14.Leading screw 10 stretches in the ram seat 9.Big nut 8 is meshing with each other with leading screw 10, big nut 8 and ram seat 9 relative fixed.Ram seat 9 links mutually by push rod 11 and piston 12, and piston 12 places piston cylinder 13, and seal ring 16 is installed on the piston 12.
Pedal signal sensor in the utility model brake system can be a pedal stroke sensor, also can be the treadle effort sensor, perhaps both and usefulness.Electronic control unit can adopt the XC164 16-bit single-chip processor of Infineon company, and the power supply of micro controller system is the Vehicular accumulator cell group.
Brake actuator 4 in the utility model brake system, comprise motor, rotatablely moving of motor output is converted into hydraulic pressure connecting line and drg between straight-line mechanism, push-rod piston mechanism, piston cylinder, piston cylinder and the drg, drg can adopt existing conventional plate disc brake or drum brake mechanism.In the brake actuator rotatablely moving of motor output is converted into straight-line mechanism is a rolling screw mechanism on principle, screw rod is that leading screw 10 is rotating parts, with the output shaft driven rotary of the fixing back of the output shaft of described motor by motor; Big nut 8 is olinear motion parts, and it is connected by bolt or other modes with the ram seat 9 of push-rod piston mechanism, adopts bolt 17 and nut 18 fixing among the embodiment of the present utility model.Big nut 8 promotes piston 12 crank motion in piston cylinder 13 of push-rod piston mechanism.
Electronic circuit comprises supply line and control signal circuit.Alarm lamp can display alarm information when mistake appears in system.
Below introduce the working process of the utility model brake system:
After chaufeur was stepped on brake pedal 1, pedal sense simulator 2 provided the pedal sense similar to the traditional vacuum energy assisted braking system for chaufeur, and pedal signal sensor 3 is gathered speed-slackening signal and passed to described electronic control unit.Electronic control unit also receives the wheel speed signal of wheel speed sensors collection, the steering wheel angle signal that steering wheel angle sensor is gathered, the yaw velocity signal that yaw-rate sensor is gathered, the lateral acceleration signal of lateral acceleration sensor acquisition, and with the driving engine communication, receive throttle signal, accelerator pedal signal, engine rotational speed signal, engine torque signal, the motor that calculates braking force size that each wheel should apply and cooresponding with it each wheel braking actuating unit according to the ESP control policy should apply the size of voltage.The size of the PWM ripple dutycycle of the voltage that applies to motor by control realizes that control applies the size of voltage to motor, thus the output torque size of control motor.Rolling screw mechanism is converted into straight-line motion with rotatablely moving of motor output, and has played to slow down and increase the effect of turning round, and makes the output torque of motor be converted into the thrust that acts in the push-rod piston mechanism.This thrust is further amplified by the hydraulic efficiency pressure system in the brake actuator (comprising hydraulic pressure connecting line 14, drg 15 between piston cylinder 13, piston cylinder and the drg), and act on the drg, act on the brake disc (or brake wheel) by the slipper in the drg.The size of the voltage that applies on the motor by control reach in the control brake device slipper to the purpose of brake disc (or brake wheel) thrust size, thereby the size of control brake power realizes the ESP control process.When system broke down, electronic control unit sent alarm message, and alarm lamp is shown.
Should be noted that at last, the above specific embodiment is only unrestricted in order to the explanation the technical solution of the utility model, although the utility model is had been described in detail with reference to specific embodiment, those of ordinary skill in the art is to be understood that, can make amendment or be equal to replacement the technical solution of the utility model, and not breaking away from the spirit and scope of technical solutions of the utility model, it all should be encompassed in the middle of the claim scope of the present utility model.
Claims (2)
1. vehicle electromechanical hydraulic braking system is characterized in that this brake system comprises:
Four wheel braking actuating units are used to receive the speed-slackening signal of electronic control unit, and realize the braking to wheel, and the wheel braking actuating unit links to each other with electronic control unit by supply line; Four wheel braking actuating units are installed on the base plate of automobile body;
Brake operating mechanism, form by brake pedal, pedal sense simulator and pedal signal sensor, be used for after chaufeur is stepped on described brake pedal, pedal sense simulator provides the pedal sense similar to the traditional vacuum energy assisted braking system for chaufeur, pedal signal sensor acquisition chaufeur is stepped on the speed-slackening signal that described brake pedal produces, by electronic circuit this speed-slackening signal is passed to electronic control unit, brake operating mechanism is installed in vehicle driver's right crus of diaphragm downside;
Wheel speed sensors is used to receive the tach signal of wheel, and tach signal is sent to electronic control unit, and the wheel speed sensors of front-wheel is installed on the steering swivel, and the wheel speed sensors of trailing wheel is installed on the spindle nose of rear axle;
Steering wheel angle sensor is used for receive direction dish angular signal, and angular signal is sent to electronic control unit, is installed on the Steering gear;
Yaw-rate sensor is used to receive the yaw velocity signal, and the yaw velocity signal is sent to electronic control unit, is installed near the vehicle floor of vehicle barycenter;
The lateral acceleration sensor is used to receive lateral acceleration signal, and lateral acceleration signal is sent to electronic control unit, is installed together with yaw-rate sensor;
Alarm lamp is used to receive the alarm message of electronic control unit, and shows that alarm lamp is installed on the pilot dash board;
Electronic control unit is used to receive the driver pedal signal of pedal signal sensor acquisition, the wheel speed signal that wheel speed sensors is gathered, the angular signal that steering wheel angle sensor is gathered, the yaw velocity signal of yaw-rate sensor collection and the lateral acceleration signal of lateral acceleration sensor acquisition; Electronic control unit receives throttle signal, accelerator pedal signal, engine rotational speed signal and the engine torque signal of vehicle motor; Judge the braking intention of chaufeur according to pedal signal wherein, calculate the sliding ratio of wheel according to wheel speed signal wherein, judge the intention that turns to of chaufeur according to steering wheel angle signal wherein, calculate the yaw velocity size and the lateral acceleration size of vehicle according to wherein yaw velocity signal and lateral acceleration signal, throttle signal in conjunction with vehicle motor, accelerator pedal signal, engine rotational speed signal and engine torque signal, calculate the braking force that each wheel is applied, and control the electric moter voltage of each wheel braking actuating unit, and then control motor output torque; When system broke down, electronic control unit sent alarm message, made alarm lamp show that electronic control unit is installed in the vehicle engine compartments.
2. brake system as claimed in claim 1, it is characterized in that wherein said wheel braking actuating unit is made up of motor, big nut, ram seat, leading screw, push rod, piston, piston cylinder and drg, described motor links to each other with described electronic control unit by supply line; The output shaft relative fixed of described leading screw and motor, the same axle mounting of leading screw, ram seat and piston cylinder, piston cylinder are fixed on the base plate of automobile body, are connected with drg by the hydraulic pressure connecting line; Described leading screw stretches in the ram seat, and described big nut and leading screw are meshing with each other, big nut and ram seat relative fixed; Ram seat links mutually by described push rod and described piston, and piston places piston cylinder.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920110660XU CN201457349U (en) | 2009-08-06 | 2009-08-06 | Electronic machinery hydraulic brake system of automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200920110660XU CN201457349U (en) | 2009-08-06 | 2009-08-06 | Electronic machinery hydraulic brake system of automobile |
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| Publication Number | Publication Date |
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| CN201457349U true CN201457349U (en) | 2010-05-12 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN200920110660XU Expired - Lifetime CN201457349U (en) | 2009-08-06 | 2009-08-06 | Electronic machinery hydraulic brake system of automobile |
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| CN (1) | CN201457349U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108146416A (en) * | 2017-11-29 | 2018-06-12 | 北京汽车股份有限公司 | Electronic braking method, system, vehicle and electronic brake pedal |
-
2009
- 2009-08-06 CN CN200920110660XU patent/CN201457349U/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108146416A (en) * | 2017-11-29 | 2018-06-12 | 北京汽车股份有限公司 | Electronic braking method, system, vehicle and electronic brake pedal |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20100512 Effective date of abandoning: 20090806 |