Page 326 - Mechanic Diesel - TT

MECHANIC DIESEL - CITS

Sensors for engine management system

1 Mass Airflow Sensors.
2 Wheel Speed Sensors.
3 Camshaft Sensors.
4 Crankshaft Sensors.

6 Knock Sensors.
7 Pressure Sensors.
8 Oxygen Sensors.
9 Eccentric Shaft Sensors.

Parts of Engine Management System (All sensors,
actuators, pumps) & their function

Objectives: At the end of this lesson you shall be able to
• locate and explain parts of engine management system.

Engine management system sensors, actuators and pumps
Sensor

In automotive vehicles, sensors are used to measure the operating conditions and changes of the vehicles.
Mainly following types of sensor are used in vehicles:
1 Oxygen sensor: Oxygen sensor is used to estimate the proportion of analysed oxygen. The concentration of
the gases emitted can also be measured.
2 Crank sensor: This electronic device is used to monitor internal combustion engines and their rotational
speed. Through this, the pulverizing speed of the piston and valve can also be monitored. Cold temperature
sensor: This type of sensor is used to measure the temperature of lubricant present in the engine of vehicles.
3 Cold Temperature sensor: This type of sensor is used to measure various temperatures like fuel temperature,
coolant temperature, intake temperature, coolant temperature etc.
4 Vehicle speed sensor: The speed of vehicles is measured with this sensor.
5 Injection pump speed sensor: This type of sensor is used to monitor the rotation speed of the pump.
6 Fuel rack position sensor: This type of sensor is used to monitor the position of the fuel bank.

7 Air flow sensor: Air flow sensor is used to measure the rate of air flow coming into the fuel injection engine.
Apart from all the above sensors, some other sensors like fuel pressure sensor, air cleaner vacuum pressure
sensor, brake pedal sensor, clutch pedal sensor, driver input switch sensor are also used in vehicles.

Actuators:
Actuators are used to transfer electrical signals into mechanical action. Electromagnetic actuators are used in
electronic diesel control systems. These types of actuators are located on the fuel pump. Sensors are used in
boost pressure actuators, butterfly valve actuators, exhaust gas recirculation actuators etc. to transfer electrical
signals into mechanical action.
Electrical Fuel Feed Pump:

Battery operated fuel pump can be installed at any convenient location. These are of two types – diaphragm and
Bellows.

313

CITS : Automotive - Mechanic Diesel - Lesson 98 - 103