In a control apparatus of a vehicle AC generator, a flip-flop for receiving a clock pulse with a constant period and a control pulse is used. The clock pulse sets the control period at the constant period, and decides an on timing of the power transistor in this control period. The control pulse de
In a control apparatus of a vehicle AC generator, a flip-flop for receiving a clock pulse with a constant period and a control pulse is used. The clock pulse sets the control period at the constant period, and decides an on timing of the power transistor in this control period. The control pulse decides an off timing. A load response control circuit performs a load response control to adjust an on time ratio of the power transistor from a lower limit to an upper limit in accordance with an increase in load, and a second control signal circuit adjusts the on time ratio from a regulated value close to the upper limit to the upper limit.
대표청구항▼
What is claimed is: 1. A control device for a vehicle AC generator which outputs a rectified AC output and feeds it to an on-board battery and electric loads of a vehicle, the control device comprising: a power transistor for controlling a field current of the vehicle AC generator; a flip-flop for
What is claimed is: 1. A control device for a vehicle AC generator which outputs a rectified AC output and feeds it to an on-board battery and electric loads of a vehicle, the control device comprising: a power transistor for controlling a field current of the vehicle AC generator; a flip-flop for on/off controlling the power transistor in each of control periods repeated at a constant period; and a generation rate monitor circuit for monitoring an on time ratio of the power transistor in each of the control periods to monitor a generation rate, wherein the flip-flop receives a clock pulse with a constant period and a control pulse, the clock pulse sets the control period and decides an on timing of the power transistor in the control period, and the control pulse decides an off timing of the power transistor in the control period. 2. The control device for the vehicle AC generator according to claim 1, wherein the flip-flop includes a first input for receiving the clock pulse, a second input for receiving the control pulse, and an output for driving the power transistor. 3. The control device for the vehicle AC generator according to claim 2, further comprising a voltage control circuit connected to the second input of the flip-flop, wherein the voltage control circuit supplies the control pulse to the second input of the flip-flop in each of the control periods. 4. The control device for the vehicle AC generator according to claim 3, wherein the voltage control circuit adjusts a position of the control pulse with respect to the clock pulse in accordance with a battery voltage of the on-board battery. 5. The control device for the vehicle AC generator according to claim 4, wherein the voltage control circuit includes a comparator, and the comparator compares the battery voltage with a reference voltage to generate the control pulse. 6. The control device for a vehicle AC generator according to claim 5, wherein the control pulse supplied at the second input of the flip-flop decides the off timing of the power transistor and the clock pulse with the constant period sets the control period at the constant period and decides the on timing of the power transistor. 7. The control device for a vehicle AC generator according to claim 5, wherein the comparator is positioned in the voltage control circuit. 8. The control device for a vehicle AC generator according to claim 1, wherein output from the flip-flop turns on and off the power transistor. 9. The control device for a vehicle AC generator according to claim 1, wherein the generation rate monitor circuit is connected to the collector of the power transistor. 10. A control device for a vehicle AC generator which outputs a rectified AC output and feeds it to an on-board battery and electric loads of a vehicle, the control device comprising: a voltage control device for repeatedly giving, at a constant period, control periods to a power transistor for controlling a field current of the vehicle AC generator and for adjusting an on time ratio of the power transistor in each of the control periods to control a generation rate; and a generation rate monitor circuit for monitoring the generation rate, wherein the voltage control device includes a load response control circuit for controlling the generation rate in accordance with an increase in load, the load response control circuit includes a first and a second control signal circuits, the first control signal circuit performs a load response control for adjusting the generation rate between a lower limit and an upper limit in accordance with the increase in the load, and the second control circuit performs, in a case where the load response control is released, a regulated load response control for adjusting the generation rate between a regulated value closer to the upper limit than to the lower limit and the upper limit in accordance with the increase in the load. 11. The control device for the vehicle AC generator according to claim 10, wherein the voltage control device includes a flip-flop for on/off controlling the power transistor, the flip-flop sets the control period by a clock pulse with a constant period, decides an on timing of the power transistor in the control period, and decides an off timing of the power transistor in the control period by a control pulse, and the load response control circuit adjusts a position of the control pulse with respect to the clock pulse, and adjusts an on time ratio of the power transistor in the control period. 12. The control device for the vehicle AC generator according to claim 11, wherein the voltage control device includes a voltage control circuit for supplying the control pulse to the flip-flop, the voltage control circuit includes a first and a second off timing control circuits, the first off timing control circuit adjusts a position of the control pulse with respect to the clock pulse in accordance with a battery voltage of the on-board battery, and the second off timing control circuit adjusts the position of the control pulse with respect to the clock pulse by the load response control circuit. 13. The control device of the vehicle AC generator according to claim 10, wherein the load response control circuit includes a load response control counter, and the load response control counter counts load response control clocks and includes an output for generating the control pulse when a count value reaches a count target value. 14. The control device for the vehicle AC generator according to claim 13, wherein the load response control counter includes a reset output and a reset input, and generates a reset output when a specified number of the load response control clocks are counted after the count value reaches the count target value, and the first control signal circuit is connected to the reset output, increases and holds the count target value by the reset output, resets the counter value, and performs the load response control. 15. The control device for the vehicle AC generator according to claim 14, wherein the second control signal circuit is connected to the reset input of the load response control counter, and the regulated load response control is performed from the regulated value. 16. The control device for the vehicle AC generator according to claim 10, wherein the lower limit is set to a generation rate of 0%, and the upper limit is set to a generation rate of 100%. 17. The control device for the vehicle AC generator according to claim 16, wherein the regulated value is set to a generation rate of 90 to 100%. 18. The control device for the vehicle AC generator according to claim 17, wherein the regulated value is set to a generation rate of approximately 95%. 19. The control device for the vehicle AC generator according to claim 10, wherein the regulated load response control is performed in a limited regulation period of 100 msec or less from the increase in the load.
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이 특허에 인용된 특허 (30)
Watanabe, Yasuyuki; Konishi, Toshiya; Ogino, Toshiyo, AC generator control system for vehicle.
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