JP4974077B2 - Vehicle generator control device - Google Patents

Description

The present invention relates to a generator control device for a vehicle that controls a generator of a vehicle to recover deceleration energy and realize an improvement in fuel consumption performance. Vehicle power generation capable of preventing overcharge and overdischarge with a simple configuration without requiring a special external input / output signal regarding means for preventing overcharge and overdischarge of the battery due to the influence of changes The purpose of this invention is to provide a machine control device.

In order to improve the acceleration performance and fuel consumption performance of the vehicle, it is preferable to control the operating state of the generator serving as the engine load.
That is, when the vehicle is accelerated, the generator load is reduced to improve the acceleration performance, and when the vehicle is decelerated, the generator load is intentionally increased to regenerate the kinetic energy of the vehicle as the amount of electricity charged to the battery. Has been devised. As a result, the amount of electricity charged in the battery that was reduced during vehicle acceleration is recovered during deceleration, and at the same time, the kinetic energy that has been lost by the brakes and engine brakes can be regenerated as the amount of electricity. Driving fuel efficiency is improved.

By the way, when the generator load control method as described above is used, the generator load is simply reduced at the time of acceleration of the vehicle, or at the same time the generator load at the time of deceleration is increased. Such a problem is known to occur.

First, the running state of the vehicle is irregular, and the time ratio between the acceleration period and the deceleration period cannot be specified. Accordingly, if the operation state in which the acceleration period is longer than the deceleration period is continued, the period during which the generator load is reduced by the generator control increases and the battery is overdischarged.
On the contrary, if the operation state in which the deceleration period is longer than the acceleration period is continued, the period during which the generator load is increased by the generator control increases and the battery is overcharged, which may cause deterioration or damage of the battery.

Secondly, the operation state of the lights or electrical components of the vehicle is irregular, and the power consumption of the entire vehicle cannot be specified. Therefore, it is clear that the battery is overcharged when the generator load increase control during deceleration by the generator control is performed in a state where the current consumption is small.
Conversely, if the generator load reduction control during acceleration is performed with a large current consumption, there is a problem that the battery is overdischarged.

In view of this problem, various solutions have been proposed.
As an example of the solution, the generator load, that is, the power consumption of the vehicle is detected from the continuity of the switching means for controlling the field current of the generator mounted on the vehicle, and the power generation time for the running state of the vehicle is detected. There is something that optimizes.
Japanese Examined Patent Publication No. 4-63639

In addition, it has been proposed to provide a consumption current detecting means including a current sensor or the like to measure the electric load amount of the vehicle and to control the generator load according to the current value or the integrated value of the consumption current.
JP 2001-173481 A

Further, there is a method of controlling the power generation command value of the generator corresponding to the traveling state of the vehicle by the traveling state detecting unit, that is, the target charging voltage of the battery, in three stages by using the traveling state detecting unit of the vehicle.
Japanese Patent Laid-Open No. 2003-061400

However, according to the method for optimizing the generator load control in the prior art as described above, from the switching state of the field current control means of the generator, the detected value of the current sensor, or the ON / OFF state of the electric load of the vehicle, etc. A means for measuring the current consumption of the vehicle is required. Therefore, additional signal input wiring is required to detect such a state, and an electric circuit or sensor for processing those electric signals is required, resulting in an increase in cost.

In addition, in order to analyze the vehicle running state in detail and control the generator, since a sophisticated computing function is required as the running state detecting means, a computing means such as a microprocessor and peripheral circuits are required, There was a problem of incurring the same cost increase.

The present invention has been made in view of the above, and does not include vehicle current consumption measuring means and does not optimize generator load control in accordance with the running state of the vehicle such as an acceleration period and a deceleration period. It is possible to prevent overcharge and overdischarge of a battery, and as a result, to provide a generator control device with a simple configuration at a low price.

In order to solve the above-mentioned problem, the invention described in claim 1 is a control device for a vehicle generator that charges a battery by a generator driven by an engine of the vehicle, and the generator control device generates a battery voltage. Input voltage boosting means for boosting the battery voltage; addition means and subtraction means for adding / subtracting a predetermined voltage to / from the battery voltage; average value calculating means for averaging the battery voltage for a predetermined period; Acceleration / deceleration detection means for detecting acceleration / deceleration, and timer circuit means for outputting an ON signal for a predetermined period when the acceleration / deceleration detection means detects acceleration or deceleration of the vehicle. The output voltage of the average value calculation means is input to the battery voltage detection terminal of the generator during a period when the output of the generator is OFF.
On the other hand, when acceleration / deceleration of the vehicle is detected by the acceleration / deceleration detecting means, the output voltage of the adding means or subtracting means is supplied to the battery of the generator during a certain ON period set by the timer circuit means. Input to the voltage detection terminal.

The gist of the present invention is that a known constant voltage charging method is optimal for a lead-sealed battery generally used in a vehicle, and a battery for a predetermined long time including a generator load control period. The average voltage value is measured, and the average voltage value of the battery is input to the battery voltage detection terminal of the generator during all periods except the generator load increase / decrease control period during the vehicle acceleration / deceleration period. It is in.

As a result, according to the present invention, during the period when the load control of the generator is not performed, the battery average voltage value including the period during which the load control of the generator is performed is used as the battery voltage detection terminal input voltage of the generator. With this configuration, the average value of the battery charging voltage over a long period of the vehicle traveling period can be matched with the target charging voltage of the battery by the reference voltage built in the generator.

As described above, the electric load operating state of the vehicle and the acceleration / deceleration duration time ratio are unspecified during the period in which the generator load increase / decrease control is performed with the acceleration / deceleration of the vehicle. Overcharge or over discharge occurs.
However, according to the present invention, the average battery charge voltage over a long period including the battery voltage during overcharge and overdischarge acts so as to match the target charge voltage defined by the generator. As a result, the average battery voltage in the actual running state of the vehicle coincides with the target charging voltage of the generator, and the battery can be prevented from being overcharged or discharged.

In addition, in order to obtain the above-described effect, the vehicle generator control device of the present invention includes an input means for an electric load operating state signal and a consumption current signal of the vehicle, a means for calculating a ratio of the acceleration / deceleration period of the vehicle, and the like. There is no need. Therefore, since an input / output wiring for an external signal or an added electronic circuit is not required, the cost is not increased.

Hereinafter, specific embodiments of a vehicle generator control device (hereinafter referred to as a “generator control device”) of the present invention will be described in detail with reference to the drawings.

In FIG. 1, reference numeral 100 denotes a generator mounted on the vehicle, which incorporates a reference voltage source (not shown) that defines a target charging voltage of the battery. The G terminal of the generator 100 is connected to the ground part of the vehicle body, and the B terminal is connected to the battery 200 to supply a charging current to the battery 200.

Reference numeral 300 denotes a generator control device according to the present invention, which takes in a signal of a known idle switch S1 provided outside and supplies operating power to the generator control device 300 via an ignition switch S2. It is configured. Further, the terminal voltage of the battery 200 is input to the generator control device 300 by the external wiring connected in the vicinity of the battery 200, and at the same time, the S terminal of the generator 100 from the generator control device 300, that is, the battery voltage detection terminal. And a desired control voltage is input to the terminal.

The generator 100 acts to control the charging current of the battery 200 by controlling the field current of the generator 100 according to the difference between the input voltage value to the S terminal and the reference voltage.

The generator control device 300 includes a timer circuit means 301 that generates each timing signal in response to the signal from the idle switch S 1, an adder circuit means 302 that adds a predetermined voltage to the terminal voltage of the battery 200, Subtraction circuit means 304 for subtracting a predetermined voltage from the terminal voltage, further, average value calculation means 303 for averaging the terminal voltage of the battery 200 for a predetermined long time, and addition circuit means 302 or subtraction circuit means 304 or average value calculation Switching circuit means 306a to 306c for switching each output voltage of the means 303 and outputting it to the S terminal of the generator 100. In addition, a booster circuit for boosting the operating power supplied to the generator control device 300 via the ignition switch S2. And means 305.

Next, referring to FIG. 2, the operation of the generator control device of the present invention will be described.

S1 in FIG. 2 represents the state of an idle switch that is turned on in the vicinity of the fully closed state in conjunction with the opening degree of a known throttle valve mounted on the engine of the vehicle, and T1 to T3 are timer circuit means. 301 is a timing signal generated.

When the signal S1 is "L", that is, when the throttle valve of the vehicle is fully closed, the outputs T3 and T1 of the timer circuit means 301 are "L" and T2 outputs "H". . Since the outputs T1, T2, and T3 are connected to the switching circuit means 306a, 306b, and 306c, respectively, the switching circuit means 306b is turned on and the other switching circuit means 306a and 306c are turned off. Yes.

Therefore, since the generator control device 300 supplies the output voltage Vavg of the average value calculation means 303 to the battery voltage detection terminal S of the generator 100 during idling of the vehicle, the reference built in the generator 100 is provided. The battery 200 is charged by the generator 100 so that the voltage and the voltage Vavg are equal.
In this case, the load factor of the generator 100 is α% determined by the electric load state of the vehicle.

Next, when the driver operates the accelerator pedal and the vehicle shifts to the acceleration state, the idle switch S1 is turned OFF and the signal S1 becomes “H”. Accordingly, the output signals T1, T2, and T3 from the timer circuit means 301 become T1 = "L", T2 = "L", and T3 = "H" during the period t1, respectively, so that the switching circuit means 306a is turned on. It becomes.

In addition, it is preferable that the value of the period t1 is normally set to about 10 seconds.

Accordingly, the adding circuit means 302 supplies a voltage obtained by adding a predetermined voltage (+ ΔV) obtained from the boosting circuit means 305 to the terminal voltage VB of the battery 200 to the battery voltage detection terminal S of the generator 100. Acts like

However, since the voltage at the battery voltage detection terminal S of the generator 100 is higher than the reference voltage during the period t1 immediately after the vehicle shifts to the acceleration state, the charging current from the generator 100 to the battery 200 is increased. As a result, the load factor of the generator 100 becomes approximately 0%.
As a result, power loss during vehicle acceleration is reduced and fuel efficiency is improved. However, at this time, the terminal voltage VB of the battery 200 gradually decreases as shown in FIG. 2 in accordance with the electric power supplied to the electric load of each part (not shown) of the vehicle.

When the period t1 is completed, the signals T1, T2, and T3 from the timer circuit means 301 are T1 = “L”, T2 = “H”, and T3 = “L”, respectively. Since the machine control device 300 outputs the output voltage Vavg of the average value calculation means 302 to the battery voltage detection terminal S of the generator 100, the generator 100 has the voltage Vavg equal to the reference voltage. Thus, the battery 200 is charged. Further, the load factor of the generator 100 at this time is similarly α%.

After the acceleration state (including the steady running state), when the idle switch is turned on and the vehicle shifts to the deceleration state, the signal S1 becomes “L”. As a result, the output signals T1, T2, and T3 from the timer circuit means 301 are T1 = “H”, T2 = “L”, and T3 = “L” during the period t2, respectively, so that the switching circuit means 306c is turned on. It becomes.

In addition, it is preferable that the value of the period t2 is normally set to about 10 seconds.

Accordingly, the subtracting circuit means 304 operates to output a voltage obtained by subtracting a predetermined voltage (−ΔV) from the terminal voltage VB of the battery 200 to the battery voltage detection terminal S of the generator 100.

However, since the voltage at the battery voltage detection terminal S of the generator 100 is lower than the reference voltage during the period t2 immediately after the vehicle shifts to the deceleration state, the charging current from the generator 100 to the battery 200 increases. Thus, the load factor of the generator 100 is approximately 100%.
As a result, energy during vehicle deceleration is regenerated to the battery 200. However, at this time, the terminal voltage VB of the battery 200 rises as shown in FIG.

When the period t2 is completed, the signals T1, T2, and T3 from the timer circuit means 301 are again set to T1 = "L", T2 = "H", and T3 = "L", respectively, during the idle period or period Similarly to the end of t1, the generator control device 300 supplies the output voltage Vavg of the average value calculating means 303 to the battery voltage detection terminal S of the generator 100, and the generator 100 is supplied with the voltage Vavg. And the battery 200 are charged so that the reference voltage becomes equal.
Further, the load factor of the generator 100 at this time similarly acts so as to return to α%.

By the way, in the situation where the electric load current consumption of the vehicle is extremely small, the amount of decrease in the terminal voltage VB of the battery 200 during the generator load reduction control period t1 during vehicle acceleration is extremely small as shown in the period t1 in FIG. Almost no.

Similarly, in a situation where the electric load current consumption of the vehicle is extremely small, the terminal voltage VB of the battery 200 rapidly increases during the generator load increase control period t2 during vehicle deceleration as shown by the period t2 in FIG.

However, when the acceleration / deceleration as shown in the figure is repeated in a situation where the electric load current consumption of the vehicle is small, the voltage Vavg averaged over the entire period of the terminal voltage of the battery 200 is represented by the period t1 and The voltage is higher than the battery terminal voltage VB in a period other than the period t2.

As is clear from the above, when the electric load current consumption of the vehicle is small, the period excluding the generator load reduction control period t1 when the vehicle is accelerated and the generator load increase period t2 when the vehicle is decelerated ( In a case where the terminal voltage VB of the battery 200 is directly supplied to the battery voltage detection terminal S of the generator 100 during the idle period or the steady running period of the vehicle, the voltage VB Since the battery 200 is charged so that the reference voltage built in the generator 100 is equal, the “Vavg−reference voltage” becomes the overcharge voltage of the battery 200 as a result.

Conversely, when the electric load current consumption of the vehicle is large, or when the deceleration period of the vehicle is smaller than the period t2, the voltage Vavg becomes smaller than the battery voltage VB and the battery 200 is overdischarged. That should be easily understood.

Therefore, the generator control device 300 according to the present invention includes all periods (idle periods or periods) except the generator load reduction control period t1 when the vehicle is accelerated and the generator load increase period t2 when the vehicle is decelerated. The average value Vavg of the battery voltage including the period during which load control of the generator is being performed from the average value calculation means 303 with respect to the battery voltage detection terminal S of the generator 100 in the normal running period of the vehicle). The battery voltage detection terminal input voltage of the generator is used.

Thus, the battery charging voltage targeted by the generator 100 in the period excluding the generator load reduction control period t1 during acceleration of the vehicle and the generator load increase period t2 during deceleration of the vehicle is the Vavg. Acts to be equal to the reference voltage.

In other words, the charging voltage of the battery 200 during the period excluding the generator load reduction control period t1 during acceleration of the vehicle and the generator load increase period t2 during vehicle deceleration is between the periods t1 and t2. The value of the generator load α during the idling or steady running of the vehicle is determined by automatically absorbing the average value fluctuation of the generated battery charging voltage.

The details of the average value calculation means 303 are realized by a known low-pass filter circuit including a resistor 3031 and a capacitor 3032 and a buffer amplifier 3033 from an input terminal 303a of the average value calculation means 303 as shown in FIG.

The time constant of the low-pass filter circuit is preferably about 10 minutes.

However, it is known that an average value calculation circuit using such a low-pass filter circuit is accompanied by a phase lag between the input / output signals of the average value calculation circuit, and the control voltage of the generator 100 is generated at a constant cycle due to the phase lag. “Hunting” that repeats vertical movement may occur.

Therefore, the average value calculation means 303 used in the generator control device 300 of the present invention is configured to add a phase advance control means by a capacitor 3034 and a resistor 3035 so as to output an average value voltage from the terminal 303b. ).
Thereby, hunting of the control voltage of the generator 100 can be prevented.

As described above, the generator control device according to the present invention does not include vehicle current consumption measuring means or the like, and does not include any means for optimizing generator load control according to the running state of the vehicle. Regardless of the value of the battery voltage due to overcharge or overdischarge during the generator load increase / decrease control period at the time of acceleration / deceleration, the battery voltage for a predetermined long time is set to the target charge voltage based on the reference voltage built in the generator. Therefore, overcharge and overdischarge of the battery do not occur.

Further, since the vehicle current consumption measuring means and the running state detecting means are not required, there is an excellent effect that a generator control device having a simple configuration can be provided at a low price.

The embodiment of the vehicle generator control device of the present invention is not limited to the configuration disclosed in the present embodiment, and can be modified and applied without departing from the gist of the present invention.
For example, it goes without saying that the generator control device of the present invention may be built in the generator or integrated with other equipment such as a known engine control device.
Moreover, it is within a range that can be easily analogized by those skilled in the art that the idle switch can detect the acceleration / deceleration state of the same purpose from a known throttle position sensor or a known vehicle speed signal.
Further, the adding circuit means 302, the average value calculating means 303, the subtracting circuit means 304, and the like can be replaced with a calculation element such as a known microprocessor.

It is a figure showing the structure of the generator control apparatus for vehicles of this invention. It is an operation | movement timing chart of the generator control apparatus for vehicles of this invention. It is detailed explanatory drawing of an average value calculating means.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Generator 200 Battery 300 Generator control apparatus 301 Timer circuit means 302 Adder circuit means 303 Average value calculating means 304 Subtraction circuit means 305 Booster circuit means 306a-306c Switching circuit means S1 Idle switch S2 Ignition switch

Claims (2)

A control device for a vehicle generator that charges a battery by a generator driven by a vehicle engine, the generator control device receiving a battery voltage and boosting the battery voltage; and An adding circuit means and a subtracting circuit means for adding / subtracting a predetermined voltage to / from a battery voltage; an average value calculating means for averaging the battery voltage for a predetermined period; an acceleration / deceleration detecting means for detecting acceleration / deceleration of the vehicle; Timer circuit means for outputting an ON signal for a predetermined period when the deceleration detection means detects acceleration or deceleration of the vehicle, and calculates the average value during a period when the output of the timer circuit means is OFF. When the acceleration / deceleration of the vehicle is detected by the acceleration / deceleration detection means, the timer circuit means outputs the output voltage of the means to the voltage detection terminal of the generator. It is characterized in that the generator load is controlled by acting to input the output voltage of the adder circuit means or the subtractor circuit means to the voltage detection terminal of the generator during a predetermined ON period. A vehicle generator control device. 2. The vehicle generator control according to claim 1, wherein said average value calculating means comprises phase correcting means such as correcting a signal phase delay between input and output signals in said average value calculating means. apparatus.

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