System Description: Description
The knock control prevents the occurrence of knock caused by fuel quality and operating conditions and securely starts the engine. When knock occurs, the ignition timing of applicable cylinder is adjusted in retard direction.
ECM performs the knock control according to the following sensors and signals.
- Knock sensor 1 and 2
- Intake camshaft position sensor (intake camshaft position)
- Exhaust camshaft position sensor (exhaust camshaft position)
- Engine coolant temperature sensor
- Charge air temperature sensor upstream of throttle valve
- Charge air temperature sensor downstream of throttle valve
- Pressure sensor downstream of throttle valve (Engine load)
- Accelerator pedal position sensor (Load requirement from the driver)
- Crankshaft position sensor (Engine speeds and crankshaft position)
In addition, torque control conditions are added.
Knock control has control items and functions as follows.
- Ignition timing adjustment
- Knock control adjustment
- Functions for knock sensors malfunction