Generator Control System Description
Precautions: General safety (00)
Generator control system consists of a generator (1), electric load current sensor (ENG A-STOP model) (5) and ECM (4).
ECM controls generated electricity (adjusting voltage of IC regulator (2)) so that it is suitable for the engine and electric load conditions. To prevent drop in idling speed that would result from quick increase in electric load and consequent increase in engine load, ECM performs a control so that the generator output increases gradually. In the case of a temporary increase in electricity generation demand while driving, ECM performs a control to limit operation of the generator and thus limits increase in load on the engine to maintain the engine performance whenever necessary (during acceleration, for example).
Operation
ECM optimally controls the generator output voltage by changing the excitation current and regulated voltage based on the following information.
•Engine condition (ECT, vehicle speed, engine speed, TP, etc.) (7)
•Battery voltage (ECM power voltage) (8)
•Electric load condition (blower motor, rear end door window defogger, headlights, radiator cooling fan, A/C compressor, etc.) (9)
•Field coil (3) control duty which indicates the operation rate of the field coil
•The signal to the “LIN” terminal of the generator adjusts the regulating voltage of the IC regulator, which in turn controls the duty ratio of the field coil and thus the output voltage (“B” terminal output) of the generator.
•Battery voltage (ECM power voltage) (8)
•Electric load condition (blower motor, rear end door window defogger, headlights, radiator cooling fan, A/C compressor, etc.) (9)
•Field coil (3) control duty which indicates the operation rate of the field coil
•The signal to the “LIN” terminal of the generator adjusts the regulating voltage of the IC regulator, which in turn controls the duty ratio of the field coil and thus the output voltage (“B” terminal output) of the generator.
(For more information on the generator output voltage, refer to Charging System in Section 1J.)
Furthermore, the generating condition of the generator is controlled to the optimum level using the electric load current sensor which detects the electrical load condition (current consumption) linearly even when a sudden electrical load variation occurs and thus the engine load is reduced.
| [A]: | ENG A-STOP model | 10. | Combination meter | 12. | ENG A-STOP control module |
| 6. | Battery | 11. | CAN driver |