JPH0564536B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is particularly directed to a power generation control device for a vehicle alternator that externally detects the running state of a vehicle or the charging state of a battery, and controls power generation based on the signals detected. It is related to.

(Prior Art and Background of the Invention) Conventionally, as a power generation control device for this type of vehicle alternator, a vehicle generator control device has been proposed in U.S. Pat. This power generation control device has an adjustment voltage switching terminal in the voltage control device and a circuit that switches the adjustment value based on a signal from the terminal, and this adjustment voltage switching terminal detects the driving state of the vehicle using various sensors. It is connected to the computer (CPU) that switches the adjustment voltage.
The regulated voltage is switched by turning on and off the regulated voltage, and a separate terminal called the regulated voltage switching terminal is required, resulting in high cost.

Further, as a conventional power generation control device for a vehicle alternator having a regulating voltage switching function, there is one having a configuration as shown in the electric circuit diagram shown in FIG. In FIG. 1, 1 is an excitation drive transistor, 12
The output voltage of the alternator is detected at the cathode terminal of the Zener diode 11. Reference numeral 15 denotes a transistor that detects the input to the adjustment voltage switching terminal C. 7 is a computer (ECU) that detects the driving state of the car.

To explain the operation of the conventional power generation control device with the above configuration, the normal regulated voltage value, e.g.
At 14.5V, the adjustment voltage switching terminal C is open, so the transistor 15 is on. When the car is accelerating or idling, the adjustment voltage is lowered to suppress the load current of the generator in order to reduce the drive torque of the generator and improve driving performance.
At that time, the signal from the ECU 7 to the adjustment voltage switching terminal C is low, and the transistor 15 is turned off. Therefore, the voltage dividing ratio of the voltage dividing point 12' with respect to the generator output terminal (B terminal) is changed, and the regulated voltage is controlled at a value lower than normal.

As mentioned above, in the conventional power generation control device shown in FIG. 1, the voltage division ratio of the generator output voltage is changed depending on the state of the regulated voltage switching terminal C, and the regulated voltage is switched. There is a problem in that a separate terminal called an adjustment voltage switching terminal is required compared to a device without a voltage adjustment terminal, which increases the number of terminals and increases the cost.

(Object of the present invention) In view of the above-mentioned problems, the present invention uses a conventional voltage control device that does not have a regulation voltage switching function, and switches the regulation voltage by intermittent control of the IG terminal according to an external signal. It is an object of the present invention to provide a power generation control device for a vehicle alternator which is advantageous in terms of cost and the ability to use conventional voltage control devices in common.

(Structure of the Present Invention) The present invention provides a power supply terminal intermittent transistor (a power supply terminal intermittent transistor) which is intermittent-controlled by a signal from a computer 7 that detects the running state of the vehicle and the battery voltage, between the battery and the power supply terminal (IG). 2 semiconductor switches) 6 are provided.

(Example) Hereinafter, an example of the present invention shown in the drawings will be described. FIG. 2 is an electric circuit diagram showing the configuration of an embodiment of the power generation control device for a vehicle alternator according to the present invention, in which 1 is an excitation drive transistor, 2 is a comparator that determines the detection of power generation, and 3 is the comparator 2. The output terminal 4 is a drive transistor for the charge lamp 16. 5 is a delay circuit for preventing the charge lamp from turning on due to IG terminal intermittent control. 6 is
A transistor 7 for determining the IG terminal has various sensors and a voltage detection terminal 8 for the battery 14 for detecting the running state of the vehicle using a computer (ECU). 9 and 10 are generator output voltages (B terminal voltage)
11 is a Zener diode, and 12' is a point where the voltage is divided by the voltage dividing resistors 9 and 10.

Next, the operation of the power generation control device according to the present invention having the above configuration will be explained. Computer (ECU) 7
functions to switch the adjustment voltage depending on the driving condition of the car. Normally, the power supply terminal IG intermittent transistor 6 is on, and the alternator is connected to the voltage control device.
Power generation is controlled by turning on and off the excitation drive transistor 1 using a regulating voltage (for example, 14.5V) set in the REG. The operation at this time is that the generator starts generating electricity, the generator output voltage rises, the voltage is divided by the voltage dividing resistors 9 and 10, and the voltage at the voltage dividing point 12' is the Zener diode 11. When the voltage exceeds the voltage, the Zener diode 11 becomes conductive and the excitation transistor 1 is cut off. Then, the excitation current decreases and the generator output voltage decreases, and when the potential at the voltage dividing point 12' becomes lower than the Zener potential, the Zener diode 11 is cut off, the excitation drive transistor 1 becomes conductive, and the generator output voltage increases.
The above operation is repeated to control the generator output to a constant value. However, during acceleration, idling, etc., the ECU
7 determines whether to switch the adjustment voltage, detects the battery voltage using the battery voltage detection terminal 8, which is one of the input signal terminals of the sensor of the ECU, and switches the power supply intermittent transistor 6 on and off, thereby setting the voltage in advance in the ECU 7. Power generation is controlled using a lower regulation voltage (e.g. 12.5V) than normal.

In addition, in the conventional power generation control device for the generator of the vehicle alternator shown in FIG. 1, power generation is detected by detecting the 1-phase terminal voltage of the armature coil of the generator from the power generation detection terminal (P terminal). and power supply terminal
This is done by comparing the voltage generated by the power supplied from the IG with a comparator 2. As a result of comparison by the comparator 2, when the generator output voltage is higher than the power generation detection voltage (6V, for example), the charge lamp 16 is turned off, and when it is lower, the charge lamp 16 is turned on. When the power supply terminal IG is controlled intermittently using the circuit shown in Figure 1, if the power supply terminal intermittent transistor is turned off for a long time, the voltage at the power generation detection terminal (P terminal) decreases, and this intermittent transistor The moment it is turned on, the power generation detection circuit may determine that power generation has stopped and the charge lamp 16 may turn on. In consideration of this, the circuit shown in FIG. 2 according to the present invention is provided with a delay circuit 5 that prevents the charge lamp from lighting due to power supply terminal intermittent control. For a certain period of time after the power supply terminal intermittent transistor 6 is turned on, the transistor 5' constituting the delay circuit 5
is turned on, so the comparator 2 has a function of cutting off the on signal to the charge lamp drive transistor 4 when power generation is stopped. A differential waveform of the power supply terminal intermittent waveform is generated at the base of the transistor 5' by the resistor and capacitor in the delay circuit 5.

As in this embodiment, if a delay circuit consisting of a transistor 5' and a resistor capacitor is provided between the power supply terminal IG and the charge lamp drive transistor (third semiconductor switch) 4, the power supply terminal intermittent transistor (second semiconductor switch) It is possible to prevent the charge lamp 16 from turning on during the intermittent control by the semiconductor switch) 6.

(Effects of the present invention) The present invention enables variable regulation voltage power generation control by using a conventional voltage control device that does not have a regulation voltage switching function as is, and makes it possible to use a common voltage control device without requiring separate terminals. It has a great effect in terms of cost.

[Brief explanation of the drawing]

FIG. 1 is an electric circuit diagram of a conventional power generation control device for a vehicle alternator, and FIG. 2 is an electric circuit diagram showing the configuration of an embodiment of the power generation control device for a vehicle alternator according to the present invention. . 13... Excitation winding, 1... Excitation drive transistor (first semiconductor switch), IG... Power supply terminal, 4... Charge lamp drive transistor (third semiconductor switch), 7... Computer (ECU), 6... Power supply terminal intermittent transistor (second semiconductor switch), 11... Zener diode.

Claims (1)

[Claims] 1 For vehicles, which includes an alternator that has an excitation winding 13 and charges an on-vehicle battery, a first semiconductor switch 1 connected to one end of the excitation winding, and a drive circuit that drives the first semiconductor switch. In a power generation control device for an alternator, a second semiconductor is connected intermittently between a battery and a power supply terminal (IG) of the drive circuit by a signal from a computer (ECU) 7 that detects the running state of the vehicle and the battery voltage. An alternating current for a vehicle characterized in that a switch 6 is provided, and when the second semiconductor switch is turned on, power generation is controlled at a normal set voltage, and when the second semiconductor switch is turned on, power generation is controlled at a voltage lower than the normal set voltage. Generator power generation control device.