雷克萨斯gx470起动保持功能英文培训课件.ppt

1、,Engine,Engine Control System Cranking Hold Function Once the ignition switch is turned to the START position, this control continues to operate starter until engine starts,Starter,Ignition Switch,Engine starts,“Start”,Operate,Operates Automatically,“ON”,Stop,Engine,Engine Control System Cranking Ho

2、ld Function System Diagram,ST,ACC,NE,THW,Park/Neutral Position Switch,Audio & Illumination,Starter Relay,Starter,Engine Coolant Temp. Sensor,Crankshaft Position Sensor,ACC Cut Relay,Ignition Switch,Engine ECU (ECM),ST,ACC,NE,THW,Park/Neutral Position Switch,Audio & Illumination,Starter Relay,Starter

3、,Engine Coolant Temp. Sensor,Crankshaft Position Sensor,ACC Cut Relay,Ignition Switch,Engine ECU (ECM),Engine,Engine Control System Cranking Hold Function The ACC cut relay cuts off the ACC circuit while engine is cranking to prevent the accessory illumination from operating intermittently,Engine,En

4、gine Control System Cranking Hold Function (Operation),Ignition Switch,Starter Relay,ACC Cut Relay,NE Signal,Time,Start,Automatically Controlled,Judgment,0.2 sec. or more,ON,Reference,Engine Control System Cranking Hold Function Judgment of the engine starting,Engine Coolant Temp. (C),Judgment Level

5、 (rpm),500,900,0,Reference Value!,Confidential,Engine,Engine Control System Cranking Hold Function The maximum cranking time will be changed with engine coolant temp.,Reference Value!,Engine Coolant Temp. (C),Max. Cranking Time (sec.),When engine coolant temp. is lower, the time limit is longer,5,0,

6、Confidential,Engine,Engine Control System Cranking Hold Function If the engine is already running, the ECM will not energize to the starter relay,Start,Ignition Switch,ON,OFF,Engine is already running,700 rpm,Starter Relay,NE Signal,Engine,Engine Control System Cranking Hold Function If the engine s

7、peed becomes 1200 rpm or more while cranking, the ECM turns off a starter relay to prevent starter overrun,Time,1200 rpm,Driver operates intentionally,OFF,Starter Relay,NE Signal,Start,Ignition Switch,ON,Engine,Engine Control System Cranking Hold Function When a starter is intentionally operated by the driver, the ECM turns off a starter relay after 30 sec. in order to prevent starter overheating,Starter Rela