JP2006314178A - Controller of generator for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To regenerate brake energy effectively during brake operation of a vehicle while ensuring operation stability under deceleration state of the vehicle when charging of a battery is accelerated by raising the generation voltage of a generator when the vehicle is in deceleration state thereby increasing the amount of power generation. <P>SOLUTION: The controller 10 of a generator 20 driven through an engine to supply power to a battery 21 and an electric load 22 for a vehicle comprises a section 12 for detecting deceleration state of the vehicle, a section 11 for controlling the output voltage from the generator to Hi voltage under deceleration state of the vehicle and to Lo voltage under non-deceleration state, and a slip estimation section 13 for calculating a slip coefficient based on a parameter value related to slipperiness of the wheel. When the vehicle transits from non-deceleration state to deceleration state, the voltage control section controls the output voltage from the generator depending on the slip coefficient such that the Hi voltage becomes lower for higher slipperiness. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for a vehicular generator that controls a dynamo that is driven by an engine and can supply power to an on-vehicle battery and an electric load for the vehicle.

  As a control device for such a vehicle generator, while the power generation voltage of the generator during vehicle travel was conventionally controlled to be constant, the power generation voltage of the generator is increased when the vehicle is in a deceleration state, When the vehicle is not in a decelerating state (that is, in a non-decelerating state), a configuration is known in which control is performed to reduce the generated voltage (see, for example, Patent Document 1).

By controlling the power generation voltage of the generator in this way, the amount of power generated by the generator increases when the vehicle is decelerated, and the charging of the battery is promoted, while the amount of power generated by the generator decreases when the vehicle is not decelerated. And charging to the battery is suppressed. Thereby, the regeneration of the braking energy at the time of vehicle braking can be achieved, and as a result, the fuel consumption characteristics of the engine can be improved.
JP-A-5-137275

  In the prior art disclosed in Patent Document 1, as described above, when the vehicle is in a decelerating state, the power generation voltage of the generator is set to be high. Will increase. Corresponding to this increase in engine load, a so-called engine brake has the same effect (that is, the action of braking force on the vehicle) on the running state of the vehicle.

  By the way, when the traveling vehicle decelerates, if the braking force by the brake becomes excessive, the wheel is locked and slippage occurs between the wheel and the road surface, which adversely affects the steering stability of the vehicle. This is well known. Such wheel slip is caused by a vehicle traveling on a so-called low μ road (that is, a slippery road) having a small coefficient of friction between the wheel and the road surface, such as a frozen paved road surface. This is likely to occur when stopping (especially sudden stop). Further, even when the steering angle at the time of turning of the vehicle is large, the wheel slip easily occurs.

  As described above, when the power generation voltage of the generator is set to be high when the vehicle is in a deceleration state, the engine generated by the power generation of the generator is used in addition to the braking force generated by the driver's braking operation when the vehicle is decelerating. A kind of engine brake accompanying the increase in load acts, and the braking force on the wheels increases while the driver is not particularly conscious. For this reason, the slip of the wheel is likely to occur, and there is a problem that it may adversely affect the steering stability of the vehicle. This becomes more prominent as the road surface becomes slippery.

  Therefore, the present invention secures steering stability in the deceleration state of the vehicle when the power generation amount is increased by increasing the power generation voltage of the generator when the vehicle is in the deceleration state to promote charging of the battery. The purpose of this invention is to enable effective regeneration of braking energy during vehicle braking.

  For this reason, the control device for a vehicle generator according to the first aspect of the present invention (first invention) controls a generator that is driven by an engine and can supply electric power to a vehicle-mounted battery and a vehicle electrical load. A control device for a generator for a vehicle, the operation state detection means for detecting the operation state of the vehicle, and the output voltage of the generator, the battery is charged when the operation state of the vehicle is in a deceleration state. Voltage control means that controls to the first voltage to be promoted and can be controlled to a second voltage that suppresses charging of the battery when the driving state of the vehicle is in a non-decelerated state; Parameter value detecting means for detecting a parameter value to be detected, and slip estimating means for estimating the ease of slipping of the wheel based on the parameter value. When the driving state of the vehicle shifts from the non-decelerating state to the decelerating state, the voltage control unit is more likely to slip depending on the ease of slipping of the wheels estimated by the slip estimation unit. The output voltage of the generator is controlled so that the voltage becomes low.

  The invention according to claim 2 of the present application (second invention) is that, in the first invention, the parameter value includes at least an outside air temperature, and the slip estimating means estimates that the wheel is likely to slip as the outside air temperature is lower. It is characterized by doing.

  The invention according to claim 3 of the present application (third invention) is the first or second invention, wherein the voltage control means changes the output voltage of the generator from the second voltage to the first voltage. An adjustment function for adjusting the change speed is provided, and when the vehicle driving state shifts from the non-decelerating state to the decelerating state, the changing speed of the output voltage is adjusted to be slower as the wheels are more likely to slip. , Is characterized by that.

  Still further, the invention of claim 4 (fourth invention) is the slip according to any one of the first to third inventions, when the driving state of the vehicle shifts from the non-decelerating state to the decelerating state. When the ease of wheel slip estimated by the estimating means exceeds a predetermined value set in advance, the output voltage of the generator is controlled to a third voltage that is equal to or higher than the second voltage and lower than the first voltage, In addition, until the engine is stopped, execution of control by the voltage control unit corresponding to the case where the driving state of the vehicle is in a deceleration state is prohibited.

According to the first invention of the present application, when the vehicle is in a decelerating state, the power generation voltage of the generator is increased to increase the amount of power generation to promote charging of the battery. When shifting to the deceleration state, according to the ease of slipping of the wheel estimated based on the parameter value related to the ease of slipping of the wheel, the first charge that promotes charging of the battery as the slipping becomes easier. The output voltage of the generator is controlled so that the voltage is lowered.
In other words, when the vehicle is in a decelerating state, the power generation voltage of the generator is increased to increase the amount of power generation to promote charging of the battery. Is suppressed. As a result, in addition to the braking force generated by the driver's braking operation, a kind of engine brake is generated along with an increase in engine load due to the power generation of the generator, and the braking force on the wheels increases without the driver being particularly conscious of the vehicle. This adversely affects the steering stability of the vehicle. As a result, it is possible to effectively regenerate the braking energy at the time of vehicle braking and contribute to the improvement of the fuel consumption characteristics of the engine while ensuring the steering stability in the deceleration state of the vehicle.

  In addition, according to the second invention of the present application, basically, the same operational effects as the first invention can be achieved. In particular, the parameter value related to the ease of slipping of the wheel includes at least the outside air temperature, and the slip estimation means estimates that the wheel is likely to slip as the outside air temperature is lower. Occurrence can be estimated easily, reliably and at low cost.

  Furthermore, according to the third invention of the present application, basically the same operational effects as those of the first or second invention can be obtained. In particular, the voltage control means has an adjustment function for adjusting a change speed when the output voltage of the generator is changed from the second voltage to the first voltage, and the driving state of the vehicle shifts from the non-deceleration state to the deceleration state. In doing so, the change speed of the output voltage is adjusted to be slower as the wheel slips more easily. Therefore, as the wheel slips more easily, the increase rate of the engine load due to the power generation of the generator becomes slower, and it can be more effectively suppressed that the steering stability of the vehicle is adversely affected.

  Still further, according to the fourth invention of the present application, basically the same effect as any one of the first to third inventions can be achieved. In particular, when the vehicle driving state shifts from the non-decelerating state to the decelerating state, if the estimated ease of wheel slipping exceeds a predetermined value set in advance, the output voltage of the generator is the second value. Since it is controlled to a third voltage that is equal to or higher than the voltage and lower than the first voltage, a certain effect can be obtained with respect to regeneration of braking energy during vehicle braking, although it is inferior to the case of being controlled to the first voltage. In this case, until the engine is stopped, the execution of control by the voltage control means corresponding to the case where the driving state of the vehicle is in a decelerating state is prohibited, so that adverse effects on the steering stability of the vehicle are avoided. Can do. That is, if the estimated ease of wheel slipping exceeds a predetermined value set in advance, the vehicle is controlled until the engine stops while ensuring a certain effect on the regeneration of braking energy during vehicle braking. Stability can be ensured.

Embodiments of the present invention will be described below with reference to the accompanying drawings.
FIG. 1 is a block diagram schematically showing the configuration of a control system for a vehicle generator according to the present embodiment. As shown in the figure, the vehicle generator control system includes a control unit 10 mainly composed of a microcomputer, for example, and an on-vehicle generator 20 (so-called alternator) is mounted on the control unit 10. Are connected so that signals can be exchanged. A vehicle-mounted battery 21 and various vehicle electrical loads 22 are electrically connected to the generator 20.

  The generator 20 is driven by a vehicle engine and can supply power to the battery 21 and the vehicle electrical load 22. The structure and operation of the generator 20 are the same as those well known in the art. . The battery 21 is, for example, a so-called lead battery using sulfuric acid as an electrolyte, which is also similar to a known battery.

The control unit 10 is connected to various sensors, measurement meters, devices, and the like in order to detect parameter values related to the driving state of the vehicle and the ease of wheel slipping while the vehicle is running.
That is, an accelerator opening sensor 31 (throttle opening sensor) that detects an accelerator opening (for example, an opening of a throttle valve in an engine intake passage), a vehicle speed sensor 32 that detects a vehicle speed, and an outside air temperature sensor 33 that detects an outside air temperature. The steering angle sensor 34 for detecting the steering angle, and the current location information unit 35a and the weather information unit 35b of the navigation device 35 mounted on the vehicle are connected to the control unit 10 so as to be able to exchange signals. These sensors and meters are all similar to known ones. As the outside air temperature sensor 33, for example, an intake air temperature sensor for detecting the temperature of intake air of the engine can be used.

  From the accelerator opening detected by the accelerator opening sensor 31 and the vehicle speed detected by the vehicle speed sensor 32, it can be determined whether or not the driving state of the vehicle is a deceleration state. That is, when the accelerator opening is zero and the vehicle speed is not zero, it can be determined that the driving state of the vehicle is a deceleration state. On the other hand, when the above conditions are not satisfied with respect to the accelerator opening and the vehicle speed, it can be determined that the driving state of the vehicle is not a deceleration state (non-deceleration state).

The outside air temperature detected by the outside air temperature sensor 33 and the steering angle detected by the rudder angle sensor 34 cause the wheels to be locked while the vehicle is running, causing slippage between the wheels and the road surface. It is related to an event that becomes easy, and can be considered as a kind of parameter related to this “ease of slipping”.
In other words, when the outside air temperature is lowered, and particularly when the outside air temperature is lowered to the road surface freezing temperature, the road surface during traveling becomes a low μ road that is very slippery, and the wheel is very slippery. On the other hand, when the outside air temperature is considerably higher than the road surface freezing temperature, there is no possibility that the wheel slips due to the road surface freezing. Further, when the steering angle is small at the time of turning of the vehicle, it is difficult for the wheel to slip due to turning of the vehicle. However, if the steering angle is increased to a certain extent, the wheel is more likely to slip.

Further, the current vehicle location information obtained by the current location information unit 35a of the navigation device 35 and the weather information obtained by the weather information unit 35b can also be considered as a kind of parameter related to the “ease of slipping”.
That is, it is possible to obtain information on warnings and warnings about heavy snow, heavy rain, floods, etc. from the weather information, and from such information and the current location information, whether the warnings or warnings exist near the current location of the vehicle. Can know. When these warnings and warnings are issued, it can be determined that the road surface is slippery and wheel slipping is likely to occur.

More preferably, the control unit 10 includes a voltage control unit 11, a deceleration state detection unit 12, and a slip estimation unit 13 therein.
The voltage control unit 11 controls the output voltage of the generator 20, and, as shown in FIG. 5, in order to promote charging of the battery 21 when the driving state of the vehicle is in a deceleration state, While the vehicle is controlled to a relatively high first voltage (Hi voltage) and the vehicle is not in a decelerated state (non-decelerated state), a relatively low second voltage ( Lo voltage).

In the present embodiment, the Hi voltage that promotes charging of the battery 21 and the Lo voltage that suppresses charging of the battery 21 are set to, for example, 14.5 volts and 12.5 volts, respectively.
As will be described later, in this embodiment, in order to accelerate charging of the battery 21 between the Hi voltage and the Lo voltage to some extent, not as in the Hi voltage, as indicated by a broken line in FIG. The third voltage (Mid voltage: for example, 13 volts) is set, and the voltage control unit 11 can control the output voltage of the generator 20 to any one of the Hi, Mid, and Lo.

  The deceleration state detection unit 12 detects whether or not the driving state of the vehicle is a deceleration state based on the accelerator opening detected by the accelerator opening sensor 31 and the vehicle speed detected by the vehicle speed sensor 32. In the deceleration state detection unit 12, as described above, when the accelerator opening is zero and the vehicle speed is not zero, it is determined that the driving state of the vehicle is in a deceleration state. When the above condition is not satisfied, it is determined that the driving state of the vehicle is not a deceleration state (non-deceleration state).

  The slip estimation unit 13 also detects the outside air temperature detected by the outside air temperature sensor 33, the steering angle detected by the steering angle sensor 34, and the current position information unit 35a of the navigation device 35. The ease of slipping of the wheel is estimated based on parameter values related to the ease of slipping of the wheel, such as the current location information and weather information (that is, navigation information) obtained by the weather information unit 35b.

  In this embodiment, for each of the outside temperature, the steering angle, and the navigation information, coefficients (outside temperature coefficient, steering angle coefficient, and navigation coefficient) that increase as the wheels easily slip are set, and these three coefficients are multiplied. In addition, the “product” is used as a slip coefficient, and the ease or difficulty of slipping is estimated according to the magnitude of the slip coefficient. Instead of this, a “sum” obtained by adding the three coefficients may be used as the slip coefficient.

  The slip estimation unit 13 has reference data such as a coefficient table (or map) as a reference for determining the three coefficient values based on the input data of the outside air temperature, the steering angle, and the navigation information. Each of the input data values is compared with a coefficient table to determine three coefficient values. As described above, these coefficient values are set so as to increase as the wheel easily slips. The reference data such as the coefficient table (or map) may be stored in a readable manner in an external storage device provided outside the slip estimation unit 13 or the control unit 10. good.

In the case of outside air temperature data, as described above, it is estimated that the wheel slips more easily as the outside air temperature is lower, and coefficient values of, for example, 1 to 3 are determined as outside air temperature coefficients according to the data value of the outside air temperature.
As described above, the parameter value related to the ease of slipping of the wheel includes at least the outside air temperature, and the slip estimation unit 13 estimates that the wheel is likely to slip as the outside air temperature is low. The occurrence of road surface freezing can be estimated easily, reliably and at low cost.

In the case of the steering angle, as described above, it is estimated that the larger the steering angle, the easier the wheel slips, and a coefficient value of 1-3, for example, is used as a steering angle coefficient according to the data value of the steering angle. Determine. Furthermore, for navigation information, as described above, it is presumed that the more the weather warning or warning is issued in the vicinity of the current location of the vehicle, the more likely the wheel slips, and the presence and type of the warning or warning. For example, a coefficient value of 1 to 5 is determined as a navigation coefficient.
As described above, the “product” obtained by multiplying the above three coefficients is used as a slip coefficient, and the ease of slipping / difficulty is estimated according to the magnitude of the slip coefficient.

  In the present embodiment, the voltage controller 11 preferably has an adjustment function for adjusting a change speed when changing the output voltage of the generator 20 from the second voltage (Lo voltage) to the first voltage (Hi voltage). And when the vehicle driving state shifts from the non-decelerating state to the decelerating state, the change speed of the output voltage of the generator 20 becomes slower as the wheels are more likely to slip (that is, the larger the slip coefficient). It is supposed to be adjusted so that

  That is, as schematically shown in the graph of FIG. 4, when the slip coefficient is small, the rising speed of the power generation voltage (output voltage) of the generator 20 is high and set to “fast”, but the slip coefficient is large. As a result, the rising speed decreases step by step. When the slip coefficient exceeds a preset reference value, the ascending speed is set to the lowest “slow”.

  As described above, when the voltage control unit 11 has an adjustment function for adjusting the change speed when the output voltage of the generator is changed from the Lo voltage to the Hi voltage, the vehicle driving state shifts from the non-decelerating state to the decelerating state. If the wheel is more likely to slip (as the slip coefficient is larger), the output voltage change speed is adjusted to be slower, so that the more the wheel is more likely to slip, the more the engine load increases due to power generation by the generator 20. It is possible to more effectively prevent the speed from becoming slow and the steering stability of the vehicle from being adversely affected.

  In the present embodiment, more preferably, the voltage control unit 11 is more likely to slip the wheel estimated by the slip estimation unit 13 when the driving state of the vehicle shifts from the non-deceleration state to the deceleration state. In other words, when the slip coefficient exceeds a preset reference value, a third (Mid) output voltage of the generator 20 is equal to or higher than the second (Lo) voltage and lower than the first (Hi) voltage. ) It is configured to control to voltage.

That is, as schematically shown in the graph of FIG. 3, the voltage control unit 11 operates the vehicle as a normal power generation voltage (output voltage) control within a range where the slip coefficient is equal to or less than a preset reference value. Is in a decelerating state, the output voltage of the generator 20 is controlled to a relatively high Hi voltage in order to promote charging of the battery 21, while the driving state of the vehicle is not in a decelerating state (non-decelerating state). In that case, in order to suppress the charging of the battery 21, the voltage is controlled to a relatively low Lo voltage.
As can be seen from the graph of FIG. 3, in the present embodiment, the Hi voltage itself is controlled to decrease stepwise as the slip coefficient increases in the range where the slip coefficient is not more than the reference value. The

  However, when the slip coefficient exceeds the reference value, the output voltage of the generator 20 is controlled to a third voltage (Mid voltage) that is higher than the Lo voltage and lower than the Hi voltage, and until the engine stops. The execution of the control by the voltage control unit 11 corresponding to the case where the driving state of the vehicle is in the deceleration state is prohibited.

  Thus, when the driving state of the vehicle shifts from the non-decelerating state to the decelerating state, if the estimated ease of slipping of the wheels (slip coefficient) exceeds a preset reference value, the generator Since the output voltage of 20 is controlled to a Mid voltage that is equal to or higher than the Lo voltage and lower than the Hi voltage, a certain effect is obtained with respect to regeneration of braking energy during vehicle braking, although it is inferior to the case of being controlled to the Hi voltage. In this case, until the engine is stopped, the execution of control by the voltage control unit 11 corresponding to the case where the driving state of the vehicle is in a decelerating state is prohibited, so that adverse effects on the steering stability of the vehicle are avoided. be able to. In other words, when the estimated ease of wheel slipping exceeds a preset reference value, the vehicle is controlled until the engine stops while ensuring a certain effect on the regeneration of braking energy during vehicle braking. Stability can be ensured.

In the vehicular generator control system configured as described above, basically, when the driving state of the vehicle shifts from the non-decelerating state to the decelerating state, the wheel slip estimated by the slip estimating unit 13 is performed. Depending on the ease (slip coefficient), the output voltage of the generator 20 is controlled so that the Hi voltage decreases as the slip easily occurs.
Next, the operation of the control system for the vehicle generator according to the present embodiment will be described with reference to the flowchart of FIG.

When the control starts, first, various detection signals and measurement signals are read in step S1. That is, at least the accelerator opening, the vehicle speed, the outside air temperature, the steering operation angle, the current vehicle location information, and the weather information are read.
Next, in step S2, it is determined whether the driving state of the vehicle is a deceleration state based on the accelerator opening and the vehicle speed. If the determination result is YES (deceleration state), in step S3, the slip estimator 13 estimates the ease of wheel slip (that is, calculates the slip coefficient).

  Then, in step S4, it is determined whether or not the ease of slipping (slip coefficient) exceeds a preset reference value. If the determination result is YES, the wheel is in a state where it is likely to slip. Therefore, in step S5, the output voltage of the generator 20 is controlled toward the Mid voltage, and a certain degree of regeneration is performed with respect to the braking energy of the vehicle, although it is inferior at the time of the Hi voltage (see FIG. 3). At this time, the rising speed of the output voltage is set to the slowest [slow] (see FIG. 4).

  Thereafter, in step S6, it is determined whether or not the output voltage of the generator 20 has reached the Mid voltage. If the determination result is YES, in step S7, the generation voltage control according to the vehicle deceleration state is executed. Prohibited until stop. Thereby, the steering stability of the vehicle is ensured until the engine is stopped while ensuring a certain effect on the regeneration of the braking energy at the time of vehicle braking. When the determination result in step S6 is NO, each step from step S1 to S5 is repeatedly executed.

  Further, when the determination result in step S4 is NO, the ease of slipping (slip coefficient) is within the range below the reference value, and the wheel is not particularly easily slipped. Therefore, in step S8, The output voltage of the generator 20 is controlled toward the Hi voltage, and effective regeneration is performed for the braking energy of the vehicle. At this time, the Hi voltage is set to decrease stepwise as the slip coefficient increases (see FIG. 3). Moreover, the rising speed of the output voltage is adjusted stepwise according to the ease of slipping of the wheel (slip coefficient). In other words, the higher the slip coefficient is, the easier the wheel slips, and the higher the output voltage rises, the closer to [slow] (see FIG. 4).

  On the other hand, if the determination result in step S2 is NO, the vehicle is not in a deceleration state in the first place. Therefore, in step S9, the output voltage of the generator 20 is set to the Lo voltage so as to suppress charging of the battery 21. Controlled. At this time, the output voltage changing speed (falling speed) is set to the fastest [fast: fixed value].

  As described above, according to the present embodiment, when the vehicle is in a decelerating state, the vehicle is operated in the case where the power generation voltage of the generator 20 is increased to increase the amount of power generation and the charging of the battery 21 is promoted. When the state transitions from the non-decelerating state to the decelerating state, the slipping is likely to occur according to the ease of slipping of the wheel (slip coefficient) estimated based on the parameter value related to the ease of slipping of the wheel. The output voltage of the generator 20 is controlled so that the Hi voltage that promotes charging of the battery 21 is lowered.

  That is, when the vehicle is in a decelerating state, the power generation voltage of the generator 20 is increased to increase the amount of power generation to promote the charging of the battery 21, so that the wheels are more likely to slip (the higher the slip coefficient), An increase in engine load due to power generation by the generator 20 is suppressed. As a result, in addition to the braking force generated by the driver's braking operation, a kind of engine brake is generated along with an increase in engine load due to power generation by the generator 20, and the braking force on the wheels is increased while the driver is not particularly conscious. An adverse effect on the steering stability of the vehicle is effectively suppressed. As a result, it is possible to effectively regenerate the braking energy at the time of vehicle braking and contribute to the improvement of the fuel consumption characteristics of the engine while ensuring the steering stability in the deceleration state of the vehicle.

  It should be noted that the present invention is not limited to the above embodiment, and various modifications and variations can be made without departing from the scope of the present invention.

  The present invention relates to a control device for a vehicular generator that controls a dynamo that is driven by an engine and can supply power to a vehicle-mounted battery and a vehicular electrical load. When the vehicle is in a decelerating state, the generator In the case where the power generation voltage is increased to increase the amount of power generation and the charging of the battery is promoted, the braking energy at the time of vehicle braking can be effectively regenerated while ensuring the steering stability in the deceleration state of the vehicle. It can be effectively used as a control device for generators for vehicles such as automobiles including buses and trucks.

1 is a block configuration diagram schematically showing the configuration of a control system for a vehicle generator according to an embodiment of the present invention. It is a flowchart explaining the action | operation of the said control system. It is a graph which shows typically the relation between a slip coefficient and the power generation voltage of a generator. It is a graph which shows typically the relation between a slip coefficient and the rate of rise of power generation voltage of a generator. It is a graph which shows typically the relation between the driving state of vehicles, and the power generation voltage of a generator.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Control unit 11 Voltage control part 12 Deceleration state detection part 13 Slip estimation part 20 Generator 21 Battery 22 Electric load for vehicles 31 Accelerator opening degree sensor 32 Vehicle speed sensor 33 Outside temperature sensor 34 Rudder angle sensor 35 Navigation apparatus 35a Present location information part 35b Weather Information Department

Claims (4)

A vehicle generator control device that controls a generator driven by an engine and capable of supplying electric power to a vehicle-mounted battery and a vehicle electrical load,
Driving state detection means for detecting the driving state of the vehicle;
The output voltage of the generator is controlled to a first voltage that promotes charging of the battery when the vehicle operating state is in a decelerating state, and when the vehicle operating state is in a non-decelerating state, the battery is controlled. Voltage control means capable of controlling the second voltage to suppress charging to
Parameter value detecting means for detecting a parameter value related to the ease of slipping of the wheel;
Slip estimation means for estimating the ease of slipping of the wheel based on the parameter value,
When the driving state of the vehicle shifts from the non-decelerating state to the decelerating state, the voltage control means causes the first voltage to be more slippery according to the ease of slipping of the wheels estimated by the slip estimation means. The output voltage of the generator is controlled so that the
A control device for a vehicle generator.   2. The control device for a vehicular generator according to claim 1, wherein the parameter value includes at least an outside air temperature, and the slip estimation means estimates that the wheel is more likely to slip as the outside air temperature is lower. The voltage control means has an adjustment function of adjusting a change speed when changing the output voltage of the generator from the second voltage to the first voltage,
When the driving state of the vehicle shifts from the non-decelerating state to the decelerating state, the change speed of the output voltage is adjusted to be slower as the wheels easily slip.
The control device for a vehicle generator according to claim 1 or 2. When the vehicle driving state shifts from the non-decelerating state to the decelerating state, if the ease of slipping of the wheels estimated by the slip estimating means exceeds a predetermined value, the generator The voltage control corresponding to the case where the output voltage of the vehicle is controlled to a third voltage that is equal to or higher than the second voltage and lower than the first voltage, and the vehicle is in a decelerating state until the engine is stopped. 4. The control device for a vehicular generator according to claim 1, wherein execution of control by the means is prohibited.

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