Group 23 EMS 2
Design and function
Unit injector The unit injectors are located under the valve cover, mounted in the cylinder head. The engine’s fuel requirement is analyzed up to 100 times per second (depending on engine rpm). The amount of fuel injected into the engine and the injection timing are electronically controlled via the unit injector’s solenoid controlled fuel valves. This means that the engine always receives the correct volume of fuel in all operating conditions, which offers lower fuel consumption, minimal exhaust emissions etc.
Alternator The alternator is belt driven and is located at the left front of the engine. The alternator’s voltage regulator is equipped with a sensor system. The sensor system compares the charging voltage between the alternator’s B+ and Bterminals, with the voltage between the battery’s positive and negative poles. The voltage regulator then compensates the voltage drop in the cables between the alternator and battery by increasing the charging voltage at the alternator, if necessary.
Starter The starter is mounted on the flywheel housing on the engine’s right side. During starting, a gear on the starter rotor shaft is moved axially so that it engages with the ring gear on the engine’s flywheel. The axial movement as well as the activation of the starter is controlled by a solenoid on the starter motor. The starter solenoid in turn is connected via the starter relay, which is activated when the starter key is turned to position III/the starter button is pressed.
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