 printable version
Management of fuel system
| Fig. 9.1. Engine Management System Fenix 5.1: 2/14 - the relay system of the engine; 3/1 - the ignition switch; 4/1 - block engine control system Fenix 5.1; 6/13 - the fuel pump; 7/15 - heated oxygen sensor (NO2S); 7/21 - speed sensor (RPM) gasoline engine; 7/22 - Sensor Manifold Absolute Pressure (MAP sensor); 7/23 - coolant temperature of the engine (ECT); 7/24 - air temperature sensor input; 7/25 - throttle position sensor; 7/26 - knock sensor (KS); 7/27 - the camshaft position sensor; 8/2 - a regulator of idling (IAC); 8/6, 8/7, 8/8, 8/9 - injectors; 8/12 - purge valve of the coal filter (CP); 10/51 - warning lamp exhaust gas temperature; 11/2 - the fuse box in the passenger compartment; 24/20 - 22-pin connector harness of the passenger compartment (C), the wiring in the engine compartment (A) (gray); 24/23 - 22-pin connector harness of the passenger compartment; 24/27 - 12-pin connector wiring harness in the engine compartment (A) - harness the engine control module (ECM); 24/33 - 4-pin harness the engine control module (UST) (B) (Q); 31/25 - prong under the dashboard
|
BU provides operation of the main relay 2/14 (Fig. 9.1), the fuel pump and injectors 6/13 8 / 6.8 / 7, 8/8, 8/9, receiving signals from the following sensors: - Speed sensor and crankshaft position 7/21; - The camshaft position sensor 7/27; - Pressure Sensor 7/22; - The air temperature sensor 7/24; - Coolant temperature sensor Engine 7/23; - The throttle position sensor 7/25; - Oxygen sensor 7/15. BU provides a system main relay operation when the ignition. Simultaneously, the fuel pump for approximately 1 s; this time is enough to create the desired fuel pressure. When cranking the engine speed sensor and the crankshaft position and the camshaft give appropriate signals to the ECU, which provides the fuel pump and the opening of the injectors for fuel injection when the speed sensor and the crankshaft position indicates the presence in the TDC. During start-up rig counts duration of injection based on engine temperature, air pressure and engine speed. After starting the engine the duration of injection is calculated based on engine speed, battery voltage, engine temperature and load, the resulting estimates the intake manifold pressure, air temperature, and the throttle opening. BU simultaneously sets the sequential injection once per operating cycle, when open the corresponding nozzle. When calculating the fuel injection quantity is also provided to the correction signal from the oxygen sensor after reaching the operating temperature. The BU includes compensation program change the battery voltage, acceleration, full load, and the fuel cut during engine braking, along with the presence of adaptive functions using information about the optimal amount of fuel injection for different traffic conditions. The unit uses this information for the introduction of amendments and compensatory allowances for wear and tear components, which minimizes the emission of toxic gases and reduce the time required to carry out maintenance work and adjustments. If knocking exceeds the limit, the amount of injected fuel increases and the combustion process is calm. To prevent damage to the engine fuel injection is stopped if the speed exceeds a permissible value. When the air conditioning compressor or the inclusion of transfer BU immediately increases the amount of fuel injected to compensate for the increase in load and thus ensure continued idling speed.
| 
