(3.2.2)--44 45制动系统执行机构装配.ppt
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1、页数:1Page:1Assembly of Actuator of Brake System Assembly of Actuator of Brake System Assembly of Actuator of Brake System Assembly of Actuator of Brake System Vehicle assembly and debuggingVehicle assembly and debugging页数:2Page:2ContentsContents Structure and Working Principle of Speed Sensor Structu
2、re and Working Principle of Speed Sensor Structure and Working Principle of Electronic Parking ActuatorStructure and Working Principle of Electronic Parking Actuator Assembly of Electronic Parking Brake System Assembly of Electronic Parking Brake System 页数:3Page:3 Structure and Working Principle of
3、Wheel Speed Sensor Structure and Working Principle of Wheel Speed Sensor I.Function of Wheel Speed Sensor 1.The function of the wheel speed sensor is to detect the speed of the wheels and input the speed signal to the ABS electronic control unit.The ECU calculates the speed of the wheels based on th
4、e signal from the wheel speed sensor.ABS ECU II.Structure and Working Principle of Wheel Speed Sensor 2.There are two types of wheel speed sensors in common use:Electromagnetic and Hall-effect types.:页数:4Page:4Wheel speed sensorWheel speed sensor1.Electromagnetic Wheel Speed Sensor 1.Electromagnetic
5、 Wheel Speed Sensor 1.1.The automobile wheel speed sensor is usually mounted at the wheel.The figure shows the shape of an electromagnetic wheel speed sensor,which generally consists of a magnetic induction sensor head and a ring gear.The ring gear is a moving part that is typically mounted on the h
6、ub or axle to rotate with the wheel.There is a certain clearance,which is generally around 1 mm,between the magnetic pole of the sensor head and the end face of the ring gear.LMM页数:5Page:52.Hall-effect Wheel Speed Sensor 2.Hall-effect Wheel Speed Sensor 2.2.A Hall-effect wheel speed sensor consists
7、of a sensor head and a ring gear.The sensor head is composed of the permanent magnet,Hall element and electronic circuits.The magnetic field lines of the permanent magnet pass through the Hall element to the gear,which makes the gear a magnetic collector.When the gear is located at the position show
8、n in figure(a),the magnetic field lines through the Hall element are dispersed,and the magnetic field is relatively weak.(a)When the gear is located at the position shown in figure(b),the magnetic field lines through the Hall element are concentrated,and the magnetic field is relatively strong.(b)(a
9、)Weak magnetic field at Hall element (b)Strong magnetic field at Hall element(a)(b)Magnetic Circuit of Hall-effect Wheel Speed Sensor Hall element Hall element Permanent Permanent magnetmagnet Hall elementHall element Permanent Permanent magnetmagnet Ring gearRing gear Ring Ring geargear 页数:6Page:6F
10、eatures of Hall-effect wheel speed sensor Features of Hall-effect wheel speed sensor Features of Hall-effect wheel speed sensorStrong resistance to electromagnetic wave interference-High response frequencyThe amplitude value amplitude value of the output signal of the output signal voltage is not af
11、fected voltage is not affected by the speed.by the speed.页数:7Page:7Function and Working Principle of Electronic Parking Actuator The electronic parking brake system,referred to as the EPB system,removes the traditional hand-operated or foot-operated parking mechanism and instead uses an electronical
12、ly controlled button to control the parking brake.EPB EPB So for drivers,the biggest advantage of this new parking brake system is its convenience of operation.From the control function aspect,the safety performance of the vehicle is greatly improved because the parking brake system is fully and ele
13、ctrically reformed and the parking brake system can be jointly controlled with other control systems,such as electronic stability control(ESC).(ESC)Moreover,a variety of control functions within the brake system are achieved electronically.Such advantages are unmatched by the traditional mechanical
14、parking systems.页数:8Page:8I.Basic Control Function of EPB 1.EPBBasic Control Function of EPB EPBStatic Clamping and Releasing FunctionDrive Away Assist(DAA)(DAA)Electronic Controlled Deceleration(ECD)(ECD)Rear Wheel Unlock(RWU)(RWU)Maintenance Function页数:9Page:91-Actuator;2-Caliper;3-Indicator;4-Con
15、trol unit ECU;5-EPB switch1-;2-;3-;4-ECU;5-EPB Diagram of integrated caliper-type electronic parking brake system II.Structure of Electronic Parking Brake System II.Structure of Electronic Parking Brake System 2.2.1.Integrated Caliper-type Electronic Parking Brake System 1.The integrated caliper-typ
16、e electronic parking brake system abandons the steel cable of the steel cable traction type parking brake system and utilizes a wire for signal transmission,thus facilitating vehicle assembly process and the simplification of parking brake system.Its structure is shown in the figure.页数:10Page:10The
17、figure below shows the structure of the drive components of the caliper-type electronic parking brake system of the Volkswagen Magotan sedan.It consists of an electric motor,a drive belt,a speed reduction mechanism,a mandrel screw,and a brake piston.The actuating components of the entire electronic
18、parking brake system are located on the rear wheel brake calipers and the signals are conducted via wires.Volkswagen Magotan Structure of Drive Components of Volkswagen Magotan Electronic Handbrake Volkswagen MagotanMotor Driving torque Brake piston Drive belt Mandrel screw Braking force of brake di
19、sc Speed reduction mechanism 页数:11Page:11Integrated caliper-type electronic parking brake systemIntegrated caliper-type electronic parking brake system When the driver presses the electronic parking brake button,the control module of the electronic parking brake receives a signal from the button.If
20、the current driving status of the vehicle meets the conditions preset in the computer,the control module applies 12V to activate the motor of the actuator.The torque released by the electric motor is transmitted to the mandrel screw through the speed reduction mechanism,and the mandrel screw drives
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