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CONTROL SYSTEM 01–40–37 01–40 GENERATOR CONTROL OUTLINE [LF] E5U014000000N52 • Idling stability and the corresponding load performance have been improved by optimum control of generator voltage according to engine operation and electrical load conditions. • The PCM determines the engine operation and electrical load conditions based on the input signals from input devices shown in the figure below and controls the excitation time of the generator field coils. End Of Sie GENERATOR CONTROL BLOCK DIAGRAM [LF] E5U014000000N53 End Of Sie GENERATOR CONTROL OPERATION [LF] E5U014000000N54 Determination of Field Coil Excitation Time • By sending a duty signal to the power transistor built into the generator, the PCM increases and • The field coil excitation current changes according to changes in the power transistor Control • To maintain optimum battery voltage, the PCM calculates the target excitation current based on the targeted generator current (target generated current) and the generator rotation speed at the time. • The generator rotation speed is calculated from the generator pulley and crankshaft pulley ratios, and the engine speed. • The PCM compares the target battery voltage (regulating voltage) calculated from the intake airflow temperature, engine speed and vehicle speed with the current battery voltage and, based on this difference, • When an electrical load is applied, the target rotation speed increases during idling because the battery voltage decreases due to the increased power consumption. End Of Sie PCM IAT SENSOR ECT SENSOR CKP SENSOR VEHICLE SPEED SIGNAL GENERATOR (TERMINAL BATTERY FIELD COIL EXCITATION TARGET EXCITATION GENERATOR TARGET GENERATED TARGET BATTERY VOLTAGE DEVIATION CURRENT BATTERY GENERATOR (TERMINAL E5U140ZT5011 1 CYCLE EXCITATION TIME C3U0140S029 |