System for controlling generator for vehicle
First Claim
1. A control system for a vehicular generator comprising:
- a generator that is installed on a vehicle and has an armature coil and a field coil;
a battery that is installed on said vehicle so as to be charged by a power generation voltage output from said armature coil; and
a control circuit that has a voltage detection circuit for detecting a terminal voltage of said battery, and adjusts said power generation voltage to a predetermined voltage by controlling to turn a field current supplied to said field coil on and off in accordance with the terminal voltage of said battery;
wherein a single control terminal is provided on said control circuit;
an external control unit is connected to said control terminal;
said external control unit supplies either one of a ground signal, an open signal and a pull-up signal to said control terminal as a control signal in accordance with the terminal voltage of said battery and an operating condition of said vehicle; and
said control circuit serves to make said generator into a power generation stop state by interrupting said field current in response to said ground signal supplied to said control terminal, adjust said power generation voltage to a first control voltage for normal time by controlling to turn said field current on and off in response to said open signal supplied to said control terminal, and adjust said power generation voltage to a second control voltage higher than said first control voltage by controlling to turn said field current on and off in response to said pull-up signal supplied to said control terminal.
1 Assignment
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Accused Products
Abstract
A control system for a vehicular generator is provided which can be simplified in construction as the entire system to achieve cost reduction by using only a single control terminal that takes in a control signal from outside and by employing the control signal composed of only three kinds of signals. The system includes a generator 2 having an armature coil 202 and a field coil 201, a battery 4 to be charged by a power generation voltage, and a control circuit 1A that adjusts the power generation voltage by controlling to turn a field current supplied to the field coil 201 on and off in accordance with a battery voltage. A single control terminal C is provided on the control circuit 1A, and an external control unit 5 is connected to the control terminal C. The external control unit 5 supplies either one of a ground signal, an open signal and a pull-up signal to the control terminal C as a control signal in accordance with the battery voltage and an operating condition of the vehicle. The control circuit 1A interrupts the field current to stop power generation in response to the ground signal, adjust the power generation voltage to a first control voltage for normal time in response to the open signal, and adjusts the power generation voltage to a second control voltage higher than the first control voltage in response to the pull-up signal.
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Citations
4 Claims
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1. A control system for a vehicular generator comprising:
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a generator that is installed on a vehicle and has an armature coil and a field coil;
a battery that is installed on said vehicle so as to be charged by a power generation voltage output from said armature coil; and
a control circuit that has a voltage detection circuit for detecting a terminal voltage of said battery, and adjusts said power generation voltage to a predetermined voltage by controlling to turn a field current supplied to said field coil on and off in accordance with the terminal voltage of said battery;
wherein a single control terminal is provided on said control circuit;
an external control unit is connected to said control terminal;
said external control unit supplies either one of a ground signal, an open signal and a pull-up signal to said control terminal as a control signal in accordance with the terminal voltage of said battery and an operating condition of said vehicle; and
said control circuit serves to make said generator into a power generation stop state by interrupting said field current in response to said ground signal supplied to said control terminal, adjust said power generation voltage to a first control voltage for normal time by controlling to turn said field current on and off in response to said open signal supplied to said control terminal, and adjust said power generation voltage to a second control voltage higher than said first control voltage by controlling to turn said field current on and off in response to said pull-up signal supplied to said control terminal. - View Dependent Claims (2, 3, 4)
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Specification