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Management ignition system
| Fig. 9.4. Elements of the system of management of ignition: 2/14 - the relay system of the engine; 3/1 - the ignition switch; 4/1 - the engine control unit Fenix 5.1; 4 / 17-1, 4 / 17-2 - the ignition coil; 8.20 - ignition capacitor; 11/2 - the fuse box in the passenger compartment; 24/20 - 22-pin harness connector of the passenger compartment (C) of the engine compartment harness (A) (gray); 24/27 - 12-pin connector wiring harness in the engine compartment (A) harness the engine control module (ECM); 31/25 - prong from the control unit fuel injection system
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In Fig. 9.4 presents controls the ignition system Fenix 5.1 and approximate their location. Electrical wiring elements is shown on the color tab. The control unit calculates the ignition timing and controls the operation of the switch, receiving signals from the following sensors. The switch breaks the primary current of the ignition coil 4/17 (Fig. 9.4), inducing a high voltage in the secondary winding. High-voltage pulses are distributed and applied to the spark plug. At BU sensors send signals to the following: - Speed sensor and crankshaft position; - The camshaft position sensor; - A pressure sensor in the intake manifold; - The air temperature sensor; - Coolant temperature of the engine; - Throttle position sensor; - Knock sensors; - BU automatic transmission. Ignition timing is constant during engine start-up. When the engine is already running and the car starts moving, CU calculates the optimum angle advance based on engine speed, load and temperature. BU has no control over the work of the knock sensors until such time as the engine warms up to operating temperature. If the cylinder starts knocking, the ignition timing is reduced to its termination, and then is restored to normal advance or return to the detonation. If these measures have been insufficient to stop detonation, the fuel injection amount increases, thereby decreasing the combustion temperature. Before switching transmission automatic transmission sends a request to the control unit torque control what BU responds briefly decrease the ignition timing. BU also sends a confirmation signal to the gearbox control unit, which in turn provides a gear change. Changing the timing advance can be from 3 ?� to 27 ?� depending on the engine load. Along with the switch CU serves to regulate the current of the ignition coil, ensuring consistently optimal energy storage, regardless of engine speed.
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