BỘ GIÁO DỤC VÀ ĐÀO TẠO TRƯỜNG ĐẠI HỌC SƯ PHẠM KỸ THUẬT TP.HCM Diagnosis Technician >> Brake >> ABS, EBD and BA TIỂU LUẬN ĐIỀU KHIỂN TỰ ĐỘNG HỆ THỐNG PHANH ABS ANTILOCK BRAKING SYSTEM KS HUỲNH PHƯỚC SƠN Thaùng 03.2004 Diagnosis Technician >> Brake >> ABS, EBD and BA NỘI DUNG: I ĐẶT VẤN ĐỀ GIỚI THIỆU VỀ HỆ THỐNG PHANH ABS LỊCH SỬ PHÁT TRIỂN CỦA HỆ THỐNG PHANH ABS II NGUYÊN LÝ ĐIỀU KHIỂN Diagnosis Technician >> Brake >> ABS, EBD and BA Control Idea of ABS (Anti-lock Brake System) General ABS slip tolerance : Braking force : Cornering force Cornering force Braking force Dry concrete Wet asphalt Dry concrete Wet asphalt Ice Ice 20 40 60 80 100 Slip ratio (%) Vehicle speed - Wheel speed Slip ratio = Vehicle speed 100 % (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General 4.Combination meter (Built-in warning light) 6.Deceleration sensor 3.Speed sensor 1.Skid Control ECU 2.Brake actuator 5.Stop light switch 4WD vehicle Speed sensor (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General Skid Control ECU 4.Combination meter (Built-in warning light) 6.Deceleration sensor 3.Speed sensor 1.Skid Control ECU 2.Brake actuator 5.Stop light switch 4WD vehicle Speed sensor (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General Brake actuator 4.Combination meter (Built-in warning light) 6.Deceleration sensor 3.Speed sensor 1.Skid Control ECU 2.Brake actuator 5.Stop light switch 4WD vehicle Speed sensor (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General Speed sensor 4.Combination meter (Built-in warning light) 6.Deceleration sensor 3.Speed sensor 1.Skid Control ECU 2.Brake actuator 5.Stop light switch 4WD vehicle Speed sensor (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA FGFGFGFG Construction General Combination meter 4.Combination meter (Built-in warning light) 6.Deceleration sensor 3.Speed sensor 1.Skid Control ECU 2.Brake actuator 5.Stop light switch 4WD vehicle Speed sensor HINT: When the Skid Control ECU has Failed (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General Stop light switch 4.Combination meter (Built-in warning light) 6.Deceleration sensor 3.Speed sensor 1.Skid Control ECU 2.Brake actuator 5.Stop light switch 4WD vehicle Speed sensor (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General Deceleration sensor(Some models only.) 4.Combination meter (Built-in warning light) 6.Deceleration sensor 3.Speed sensor 1.Skid Control ECU 2.Brake actuator 5.Stop light switch 4WD vehicle Speed sensor (1/1) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU General Brake fluid level warning switch Stop light switch Brake actuator Speed sensors Skid Control ECU Speed sensors Speed meter ABS warning light DLC3 Brake system warning light Combination meter (1/4) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU Control Vehicle speed A B Speed C D Wheel speed + Wheel acceleration rate Signal Reduction Holding Increase Wheel cylinder hydraulic pressure Time (sec.) (2/4) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU Vehicle speed A B Speed C D Wheel speed + Wheel acceleration rate Signal Reduction Holding Increase Wheel cylinder hydraulic pressure Time (sec.) (2/4) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU Vehicle speed A B Speed C D Wheel speed + Wheel acceleration rate Signal Reduction Holding Increase Wheel cylinder hydraulic pressure Time (sec.) (2/4) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU Vehicle speed A B Speed C D Wheel speed + Wheel acceleration rate Signal Reduction Holding Increase Wheel cylinder hydraulic pressure Time (sec.) (2/4) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU Vehicle speed A B Speed C D Wheel speed + Wheel acceleration rate Signal Reduction Holding Increase Wheel cylinder hydraulic pressure Time (sec.) (2/4) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU Front right BA Front left BA ON OFF ON OFF Front right Reduction ON OFF Solenoid system Front right Holding ON OFF Front left Reduction ON OFF Front left Holding ON OFF Rear right Reduction ON OFF Rear right Holding ON OFF Rear left Reduction ON OFF Rear left Reduction ON OFF Motor ON OFF Condition before the initial check Check start Solenoid check Check end (3/4) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU : Light ON Item ABS EBD BA : Light OFF Skid Control ECU ABS warning light Brake system warning light Code 72 C1272 / 72 ON OFF DLC3 TC DLC3 CG (4/4) Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator General View from A View from B View from C Motor Brake actuator Skid control ECU Cross section from A view Pressure holding solenoid valve Brake assist switching solenoid valve Pump Pressure reduction solenoid valve Cross section from B view Reservoir Cross section from C view (1/3) Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator Operation ABS & VSC & TRC & BA brake actuator Brake master cylinder Pressure sensor Brake assist switching valve Holding valve Holding valve Holding valve Reduction valve Skid Control ECU Reduction valve Reservoir Holding valve Pump Pump Reduction valve Brake assist switching valve Reduction valve Reservoir Speed sensors Front left Rear right Front left wheel or rear right wheel system Rear left Front right Front right wheel or rear left wheel system Deceleration sensor (4WD vehicle) (2/3) ... 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