Section Two. Sensor Signal Collection System
One. Description
The function of signal collection system is to provide to the ECM the working status of
the engine and vehicle and the driver’s requirements on power and auxiliary functions.
The following signals are currently adopted for the system:
- Engine speed and crank shaft position sensor
- Camshaft position sensor
- Knock sensor
- Oxygen sensor
- Throttle position sensor
- Air intake manifold pressure sensor
- Air intake temperature sensor
- Engine cooling fluid temperature sensor
- Vehicle speed sensor
Two. Engine speed and crank shaft position sensor (CPS)
No. 20
No. 50
No. 01
No. 01
1. Functions and principles
The crank angle sensor output is used to determine crank
shaft position and turning speed.
The engine speed and crank shaft position sensors are
electromagnetic sensors and located near the crank shaft,
working together with the 58x gear ring on the crank
shaft. When the crank shaft turns, the 58x gear tip and
gear trough passes the sensor in different length. The
sensor feels the magnetic resistance variations and gives
out variable output signals. The notch on the 58x gear
ring corresponds with the upper limit of the engine.
When the first cylinder upper limit is reached, the sensor faces the lower edge of the 20
th
tooth of the 58x gear ring. ECM uses this signal to determine the position and speed of
the crank shaft.