Tiểu luận Điều khiển tự động Hệ thống phanh ABS

Diagnosis Technician >> Brake >> ABS, EBD and BABỘ GIÁO DỤC VÀ ĐÀO TẠO TRƯỜNG ĐẠI HỌC SƯ PHẠM KỸ THUẬT TP.HCM TIỂU LUẬN ĐIỀU KHIỂN TỰ ĐỘNG HỆ THỐNG PHANH ABS ANTILOCK BRAKING SYSTEM KS. HUỲNH PHƯỚC SƠN Tháng 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 General Control Idea of ABS (Anti-lock Brake System) (1/1) Br ak in g fo rc e ABS slip tolerance : Braking force : Cornering force Dry concrete Wet asphalt Dry concrete Wet asphalt Ice Ice C or ne rin g fo rc e 0 20 40 60 80 100 Slip ratio (%) Slip ratio = Vehicle speed - Wheel speed Vehicle speed 100 % Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General (1/1) 1.Skid Control ECU 6.Deceleration sensor 4.Combination meter (Built-in warning light) 3.Speed sensor 5.Stop light switch 2.Brake actuator 4WD vehicle 3. Speed sensor Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General (1/1) 1.Skid Control ECU 6.Deceleration sensor 4.Combination meter (Built-in warning light) 3.Speed sensor 5.Stop light switch 2.Brake actuator 4WD vehicle 1. Skid Control ECU 3. Speed sensor Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General (1/1) 1.Skid Control ECU 6.Deceleration sensor 4.Combination meter (Built-in warning light) 3.Speed sensor 5.Stop light switch 2.Brake actuator 4WD vehicle 2. Brake actuator 3. Speed sensor Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General (1/1) 1.Skid Control ECU 6.Deceleration sensor 4.Combination meter (Built-in warning light) 3.Speed sensor 5.Stop light switch 2.Brake actuator 4WD vehicle 3. Speed sensor 3. Speed sensor Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General (1/1) 1.Skid Control ECU 6.Deceleration sensor 4.Combination meter (Built-in warning light) 3.Speed sensor 5.Stop light switch 2.Brake actuator 4WD vehicle 4. Combination meter HINT: When the Skid Control ECU has Failed 3. Speed sensor FGFGFGFG Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General (1/1) 1.Skid Control ECU 6.Deceleration sensor 4.Combination meter (Built-in warning light) 3.Speed sensor 5.Stop light switch 2.Brake actuator 4WD vehicle 5. Stop light switch 3. Speed sensor Diagnosis Technician >> Brake >> ABS, EBD and BA Construction General (1/1) 1.Skid Control ECU 6.Deceleration sensor 4.Combination meter (Built-in warning light) 3.Speed sensor 5.Stop light switch 2.Brake actuator 4WD vehicle 6. Deceleration sensor(Some models only.) 3. Speed sensor Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU (1/4) Brake fluid level warning switch 1. General Stop light switch Speed sensors Brake actuator Skid Control ECU DLC3 Speed meter ABS warning light Brake system warning light Combination meter Speed sensors Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU (2/4) Speed 2. Control Vehicle speed A B C D Wheel speed + - Wheel acceleration rate Reduction Holding IncreaseS ig na l Wheel cylinder hydraulic pressure Time (sec.) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU (2/4) Speed Vehicle speed A B C D Wheel speed + - Wheel acceleration rate Reduction Holding IncreaseS ig na l Wheel cylinder hydraulic pressure Time (sec.) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU (2/4) Speed Vehicle speed A B C D Wheel speed + - Wheel acceleration rate Reduction Holding IncreaseS ig na l Wheel cylinder hydraulic pressure Time (sec.) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU (2/4) Speed Vehicle speed A B C D Wheel speed + - Wheel acceleration rate Reduction Holding IncreaseS ig na l Wheel cylinder hydraulic pressure Time (sec.) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU (2/4) Speed Vehicle speed A B C D Wheel speed + - Wheel acceleration rate Reduction Holding IncreaseS ig na l Wheel cylinder hydraulic pressure Time (sec.) Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU (3/4) S ol en oi d sy st em Front right BA Front left BA Front right Reduction ON OFF ON OFF ON OFF 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 Diagnosis Technician >> Brake >> ABS, EBD and BA Control Skid Control ECU (4/4) : Light ON Item : Light OFF ABS warning light Brake system warning light ABS EBD BA Skid Control ECU DLC3 C1272 / 72 Code 72 ON OFF TC DLC3 CG Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator (1/3) View from C View from A View from B Brake actuator Skid control ECU Motor Cross section from A view Pressure holding solenoid valve Brake assist switching solenoid valve Pressure reduction solenoid valve Cross section from B view Pump Reservoir Cross section from C view 1. General Diagnosis Technician >> Brake >> ABS, EBD and BA Operation Brake Actuator (2/3) Brake master cylinder 2. Operation ABS & VSC & TRC & BA brake actuator Pressure sensor Brake assist switching valve Brake assist switching valve Holding valve Holding valve Holding valve Holding valve Reduction valve Reduction valve Reduction valve Reduction valve Skid Control ECU Front left wheel or rear right wheel system Rear right Rear left Front right Front right wheel or rear left wheel system Speed sensors Deceleration sensor (4WD vehicle) Pum p Pum p Front left Reservoir Reservoir