路虎车身电气系统培训课件.pdf

车身电气系统培训 Slide 1 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical signals Slide 2 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical Signals Examples of electrical signals:- •Analogue signals •DC •AC •Digital signals •PWM •Pulse frequency •CAN Bus Slide 3 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical Signals - Analogue - DC •Heated rear window switch •Fog lamp switch •Air condition request •Any potentiometer （电压计） •Any resistive feedback circuit e.g coolant temp sensor Slide 4 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical Signals - Analogue - DC As seen on an oscilloscope 5 VOLTAGE LINEAR CHANGE FROM A SENSOR 0 Slide 5 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical Signals - Analogue - AC •Crankshaft position sensor •Pulse generator distributor •Wheel speed sensor •Internal winding of an alternator (not output) Slide 6 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical Signals - Analogue - AC Crankshaft sensor output As seen on an oscilloscope Slide 7 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical Signals - Digital - PWM •Temperature gauge •Oxygen sensor heater circuit •Idle air control valve •Heated door mirror circuit •Purge valve Slide 8 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical Signals - Digital - PWM As seen on an oscilloscope Slide 9 © Land Rover 2003. Presenter / File name 10/17/2015 5:04 PM Electrical Signals - Digital - FDSW Frequency dependent squ