JPS58179134A - Charger for automotive battery - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a charging device for a vehicle battery, and more particularly, to a charging device for a vehicle battery that controls charging according to the driving state of the vehicle.

A vehicle is equipped with a battery and a generator as a power source for an engine starting system, an ignition system, and many other electrical devices. The generator is driven by the engine via a belt, and when the amount of power generated is less than the load on the battery (1), the battery acts as a power source and discharges, and when the amount of power generated is greater than the load, the generator is the only power source. The battery is charged by the generator. A voltage regulator used in conjunction with a generator controls the current flowing through the field coil of the generator, thereby controlling the generated voltage and supplying appropriate power to various electrical devices. It has a charging function.

First, a conventional example of a battery charging device will be explained with reference to FIG. 1, and its problems will also be mentioned.

The generator 2 is a rotating field type generator in which the magnetic poles driven by the engine 1 rotate. When a current is passed through the field coil 21, which is a 4M excitation coil in the rotor core 20,
The rotors 22 and 23 are magnetized to form north and south poles.

A slip ring 24 and a brush 24a are provided to pass current through the field coil 21 of the rotating rotor.

A stator 25 is disposed outside the rotor, and a stator coil 26, which is a power generation (2) coil, is wound around the stator 25. Since AC voltage is generated in the stator coil 26, the rectifier 3
rectified by When the generated voltage is higher than the terminal voltage of the battery 5, the battery 5 can be charged by that amount.

The regulator 4 is the output voltage of the generator 2 or the battery 5
It has the function of controlling the voltage by detecting the terminal voltage of and controlling the field current.

In other words, the voltage generated by the generator 2 activates the cutout relay in the regulator 4 to control the maximum charging current.

However, in conventional charging devices, the regulator is not controlled in consideration of vehicle running conditions such as constant speed, braking, deceleration, acceleration, or sudden acceleration. When braking or decelerating, if the amount of power generation fi2 is large, the braking energy and deceleration energy are simply converted into thermal energy and are discarded, and are not used effectively.

Further, even when accelerating suddenly, charging is performed if the amount of power generated by the generator is small, resulting in a loss of output from the engine due to the generator, which also has an adverse effect on acceleration response.

In other words, since the generator 2 is driven by the engine, charging can be stopped when a load is applied to the engine, and conversely, charging can be actively performed when a load is to be applied to the engine.

However, conventional batteries lacked sufficient durability to withstand instantaneous high current charging, so it was not possible to instantaneously flow a large current through the battery even during braking, etc. It was adjusted to keep the terminal voltage constant.

In recent years, the characteristics of batteries have improved, and they now have sufficient durability even when large currents are passed instantaneously.

Furthermore, a battery has a characteristic that once the terminal voltage is increased significantly, the battery does not return to its original state for a while even if this voltage is removed. That is, after a large charging current is passed, charging is not promoted even if the state returns to normal, so if the vehicle is charged during braking, etc., it will not be charged during constant speed driving, and output loss can be reduced.

(3) Therefore, an object of the present invention is to provide a charging device for a vehicle battery that can perform -C charging control according to the driving state of the vehicle.

In order to achieve the above object, a vehicle battery charging device according to the present invention drives a generator using part of the engine output to charge the battery. It consists of a sensor that detects information that causes deceleration and information that causes acceleration, and a control voltage circuit that judges the sensor output and increases the field coil current during deceleration and decreases the field coil current during acceleration. has been done.

According to the above configuration, the object of the present invention can be completely achieved.

Hereinafter, the present invention will be explained in more detail with reference to the drawings and the like.

FIG. 2 is a block diagram showing an embodiment of the vehicle battery charging control device of the present invention.

Generate electricity using part of the output of engine 1! After the excitation coil 21 of No. 2 is rotated and rectified by the rectifier 4 (5) (4), if the voltage is higher than the terminal voltage of the battery 5, the battery 5 is charged by that amount.

The deceleration state of the vehicle is detected by the deceleration element sensor 7, and a detection signal from the deceleration element sensor 7 is input to the control voltage circuit 6.

In the control voltage circuit 6, when the deceleration signal from the deceleration element sensor 7 is input, the field current flowing through the excitation coil 21 is increased to increase the amount of power generation. On the other hand, when the deceleration signal is not input, the field current is reduced to reduce the amount of power generation.

As a result, the amount of charge is reduced during normal driving, idling, and acceleration when fuel consumption is an issue, and conversely, fuel consumption is low, but during deceleration when engine braking performance is required, the charging load is increased to recover energy. It assists in measuring energy braking.

The inventor of the present invention conducted experiments with various control voltage heights and obtained the following results.

Charging performance cannot be unnecessarily increased in terms of battery life, and considering the general usage of vehicles, it is inconvenient to reduce charging (6) to zero during idling, constant speed driving, etc. Understood. Compared to the current charging amount, when idling, constant speed, etc., the current charging amount is less than 1/2,
It was found that 3 times or more is appropriate when decelerating.

FIG. 3 is a block diagram showing a second embodiment of the charging device according to the present invention.

In the first embodiment, a deceleration element sensor 7 for detecting deceleration is provided to detect deceleration, and determination is made based on the absence of a signal from the deceleration element sensor 7 at times other than deceleration.

On the other hand, in the second embodiment of °C1, the temperature is idling.

In order to further reduce the amount of charge required when driving at a constant speed, this technology focuses on the fact that even more fuel savings can be achieved by separating conditions when the fuel consumption rate is high, such as during acceleration, and controlling the amount of charge to a lesser extent. .

That is, in addition to the deceleration element sensor 7, the acceleration element sensor 8
is installed to detect that the vehicle is accelerating (an acceleration signal is input to the control voltage circuit 6, and the field current in the excitation coil 21 is slightly increased compared to when the speed is constant, increasing the amount of charge).

FIG. 4 is a block diagram showing a third embodiment of the charging device according to the present invention.

In the thirteenth embodiment, the running state of the vehicle is further detected using various sensors, and the control voltage is finely set and controlled according to the running state of the vehicle.

The operating state detection sensor 9 is basically a vacuum switch 91 that detects the suction negative pressure of the intake manifold. Air flow meter 92 for detecting intake air amount. A rotation speed sensor 93 that detects the engine rotation speed from the ignition coil. It consists of a vehicle speed sensor 94 provided in the transmission section and a battery voltage needle 95 of the battery 5.

Furthermore, the driving state detection sensor 9 can also use information from a throttle position sensor that detects the throttle valve opening, a water temperature sensor that detects the engine cooling water temperature, etc. to analyze the driving state of the vehicle in more detail.

In the control voltage circuit 6, each sensor ＼ (
), and determines the appropriate field coil current in stages according to the driving condition of the vehicle.
1 is excited to control the amount of charge.

As explained in detail above, according to the present invention, the battery charging device can be controlled according to the driving condition of the vehicle, so the driving force of the generator during constant speed and acceleration can be reduced, and the output loss of the engine during driving can be reduced. This has the effect of reducing fuel consumption and ultimately improving fuel efficiency.

Furthermore, since the current in the excitation coil is increased during deceleration and a load is applied to the engine, it can also serve as an auxiliary engine brake.

[Brief explanation of the drawing]

FIG. 1 is a circuit diagram showing a conventional example of a charging device for a vehicle battery, FIG. 2 is a block diagram showing a first example of a charging control device for a vehicle battery according to the present invention, and FIG. FIG. 4 is a block diagram showing a second embodiment of the vehicle battery charging control device of the present invention, and FIG. 4 is a block diagram showing a third embodiment of the vehicle battery charging control device of the present invention. (9) (8) 1... Engine 2... Generator 21...
Excitation coil 26... Generator coil 4... Rectifier 5... Battery 6... Control voltage circuit
7...Deceleration element sensor 8...Acceleration element sensor
9... Driving status element sensor patent applicant Suzuki Motor Co., Ltd. agent Patent attorney Hisashi Inoro (10)

Claims (1)

[Claims] In a vehicle battery charging device that drives a generator using part of the output of an engine to charge a battery, a sensor detects information that causes deceleration and information that causes acceleration from the running state of the vehicle; A charging control device for a vehicle battery, comprising a control voltage circuit that judges sensor output and increases field coil current during deceleration and decreases field coil current during acceleration.