JP2861652B2 - Control device for vehicle generator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for controlling a generated voltage of a vehicle generator.

[0002]

2. Description of the Related Art In a generator provided in an automobile or the like, a generated voltage is controlled in accordance with an electric load and operating conditions, so that a power supply voltage stored in a battery is maintained at a predetermined value or more (Japanese Patent Laid-Open Publication No. Hei. No. 136550, reference).

[0003] As this type of control device, a command value for lowering the generated voltage is output to the generator under an operating condition with a high engine load such as during acceleration to reduce the engine load required to drive the generator. Then, there was one that did not impair the acceleration performance.

When the acceleration time exceeds a reference value, the output of a command value for lowering the generated voltage is prohibited to prevent the power supply voltage from lowering.

[0005]

However, in such a conventional control device, when accelerating operation is repeated, for example, when climbing a long sloping road, a decrease command value of the generated voltage is obtained by observing the acceleration time. Even if the power generation voltage is prohibited, the generation voltage reduction command value is output again at the time of re-acceleration, so that the operation time when the generation voltage is low may increase in total, and there is a concern that the voltage stored in the battery may be significantly reduced. Was.

An object of the present invention is to solve the above problems by focusing on the above problems.

[0007]

According to the present invention, as shown in FIG. 1, a means 2 for controlling a generated voltage of a generator 1 based on operating conditions and an output time T ₁ of a command value for decreasing the generated voltage are integrated. Means 3 for integrating the output time T ₂ of the command value which does not lower the generated voltage, and means 4 for integrating the output integrated time differences T ₂ -T
Means 5 for comparing ₁ with a reference value, and the integrated time difference T ₂ -T
Means 6 for prohibiting the output of a command value for decreasing the generated voltage when ₁ becomes equal to or less than the reference value.

Further, as shown in FIG. 2, means 2 for controlling the generated voltage of the generator 1 from the operating conditions, means 7 for integrating the time t ₁ during which the power supply voltage is lower than the reference value, Means 8 for integrating the above time t ₂ , means 9 for comparing each integrated time difference t ₂ -t ₁ with a reference value, and generating voltage when the integrated time difference t ₂ -t ₁ becomes equal to or less than the reference value. Means 10 for inhibiting the output of a command value for reducing the

[0009]

[Action] By controlling the power generation voltage while viewing the output integrated time difference T ₂ -T ₁ of the generation voltage command value, if for example such as climbing a long hill, that lower operating time of the generator voltage and the total is increased While avoiding, it is possible to increase the acceleration performance by lowering the power generation voltage. Also, by controlling the generated voltage while observing the difference in the accumulated accumulated time of the power supply voltage, similarly, it is possible to avoid an increase in the operation time when the generated voltage is low in total, and to prevent the voltage stored in the battery from being significantly reduced. Can be prevented.

[0010]

Embodiments of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 3, the control device 15 controls the vehicle speed,
Each detection signal such as an engine speed, an engine cooling water temperature, an electric load, and a power supply voltage is input, and a command value of a generated voltage is output to the generator 1. The generator 1 is driven by the engine, and a driving load corresponding to the command value of the generated voltage is applied to the engine. The control device 15 gradually changes the generated voltage command value according to these operating conditions, or switches the generated voltage command value to, for example, one of 13V and 14V.

The control device 15 basically controls the power supply voltage so as not to be lower than a predetermined value according to the electric load. However, a command value for reducing the generated voltage under a high engine load operating condition such as acceleration. Is output so as not to impair the acceleration performance.

The control device 15 integrates the output time T ₁ of the command value for reducing the power generation voltage to, for example, ₁₃ V in order to prevent the power supply voltage from dropping significantly under the operating conditions under which the acceleration operation is repeated. the output time of the command value does not decrease the power generation voltage, for example, as a 14 V T ₂ integrated, each output integrated time difference T ₂ -T ₁ was compared with a reference value,
When the accumulated time difference T ₂ −T ₁ is equal to or larger than the reference value, the output of the command value for decreasing the generated voltage is prohibited.

This control will be described with reference to the flowchart of FIG.

In step 1, an integrated time difference T ₂ −T ₁ between the integrated value T ₁ of the output time of the command value for decreasing the generated voltage and the integrated value T ₂ of the output time of the command value for not reducing the generated voltage is used as a reference value ( (For example, 10 seconds).

If it is determined in step 1 that the accumulated time difference T ₂ -T ₁ is longer than 10 seconds, the process proceeds to step 2 to determine whether the vehicle is accelerating.

If it is determined in step 2 that the vehicle is accelerating, the flow advances to step 3 to output a command value for reducing the generated voltage to, for example, 12V. Then the process proceeds to Step 4, it integrates the output time T ₁ of the instruction value to reduce the power generation voltage.

On the other hand, if it is determined in step 1 that the accumulated time difference T ₂ -T ₁ is within 10 seconds, the process proceeds to step 5 and outputs a normal command value for increasing the power generation voltage to, for example, 14V. Then proceed to step 6 integrates the output time T ₂ of the command value does not reduce the power generation voltage.

If it is determined in step 2 that the vehicle is not accelerating, a normal command value for increasing the power generation voltage to 14 V is output in step 5 and
Willing integrating the output time T ₂ of the command value does not reduce the power generation voltage.

In this way, by controlling the generated voltage while observing the output integrated time difference T ₂ -T ₁ of each command value,
For example, when climbing a long slope, when the power supply voltage is sufficiently high, the power generation voltage is reduced to improve the acceleration performance, while avoiding an increase in the total operation time when the power generation voltage is low, and the voltage stored in the battery. Can be prevented from being significantly reduced.

Next, as another embodiment, the control device 15
In order to prevent the power supply voltage from dropping remarkably under the operating conditions under which the acceleration operation is repeated, the time t _{1 at} which the power supply voltage is lower than the reference value (for example, ₁₃ V) is integrated, and when the power supply voltage is higher than the reference value. Integrate a certain time t ₂ ,
Each accumulated time difference t ₂ -t ₁ is compared with a reference value, and when the accumulated time difference t ₂ -t ₁ becomes equal to or less than a reference value (for example, 10 seconds), output of a command value for decreasing the generated voltage is prohibited.

This control will be described with reference to the flowchart of FIG.

In step 11, the power supply voltage VB is set to 13V
It is determined whether it is lower.

If it is determined in step 11 that the power supply voltage VB is lower than 13 V, the process proceeds to step 12 and the time t ₁ during which the power supply voltage VB is lower than ₁₃ V is integrated.

On the other hand, in step 11, the power supply voltage VB becomes 13
If it is determined that more than V, the power supply voltage VB is integrating the time t ₂ is more than 13V proceeds to step 13.

Then, the process proceeds to a step 14, wherein the power supply voltage V
The accumulated time difference t ₂ −t ₁ between the time t _{1 when} B is lower than ₁₃ V and the time t _{2 when} the power supply voltage VB is ₁₃ V or more is compared with a reference value (for example, 10 seconds).

In step 14, the accumulated time difference t ₂ -t ₁ is 10
If it is determined that the time is longer than the second, the process proceeds to step 15 to determine whether or not the vehicle is accelerating.

If it is determined in step 15 that the vehicle is accelerating,
Proceeding to step 16, a command value for reducing the generated voltage to, for example, 12 V is output.

On the other hand, at step 14, the accumulated time difference t ₂ -t ₁
Is determined to be within 10 seconds, the routine proceeds to step 17, where a normal command value for increasing the generated voltage to, for example, 14V is output.

If it is determined in step 15 that the vehicle is not accelerating, the process proceeds to step 17 to output a normal command value for increasing the generated voltage.

By controlling the generated voltage while watching the power supply voltage VB in this manner, for example, when climbing a long slope, if the acceleration operation is repeated as shown in FIG. Is repeated at the boundary, but when the accumulated time difference t ₂ −t ₁ becomes equal to or more than the reference value, the generated voltage is increased to 14 V to avoid an increase in the total operating time of the generated voltage, It is possible to prevent the voltage of the battery from dropping remarkably.

[0032]

As described above, according to the present invention, in a control apparatus for a vehicle generator, for example, by controlling the generated voltage while monitoring the output integrated time difference T ₂ -T ₁ of the generated voltage command value, for example, on a long slope. When the power supply voltage is sufficiently high, the power generation voltage is reduced and the acceleration performance is improved, while avoiding an increase in the total operation time when the power generation voltage is low, and the battery voltage drops significantly. Can be prevented.

The power supply voltage k variation integrated time difference t ₂ -t ₁
Similarly, by controlling the generated voltage while monitoring the voltage, it is possible to avoid an increase in the operation time when the generated voltage is low as a whole, and to prevent a significant decrease in the voltage of the battery.

[Brief description of the drawings]

FIG. 1 is a diagram corresponding to claims of the present invention.

FIG. 2 is a diagram corresponding to claims of the present invention.

FIG. 3 is a configuration diagram showing an embodiment of the present invention.

FIG. 4 is a flowchart showing control contents.

FIG. 5 is a flowchart showing control contents in another embodiment.

FIG. 6 is a timing chart showing the same operation.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 generator 2 power generation voltage control device 3 power generation voltage reduction control time T ₁ integration means 4 normal power generation voltage control time T ₂ integration means 5 T ₂ -T ₁ comparison means 6 voltage reduction control means 7 power supply voltage reduction time Means for integrating t ₁ 8 Means for integrating rise time t ₂ of power supply voltage 9 Means for comparing t ₂ -t ₁ 10 Means for controlling voltage drop

──────────────────────────────────────────────────続 き Continuation of front page (58) Field surveyed (Int.Cl. ⁶ , DB name) H02P 9/00-9/30 H02J 7/14-7/32 F02D 29/00-29/06

Claims (2)

(57) [Claims] 1. A means for controlling a generated voltage of a generator from operating conditions, and an output time T _{1 of} a command value for reducing the generated voltage.
, A means for integrating the output time T ₂ of the command value that does not lower the generated voltage, and a means for integrating each output integrated time difference T ₂ −T
Means for comparing ₁ with a reference value, and the accumulated time difference T ₂ -T ₁
Means for prohibiting the output of a command value for lowering the generated voltage when the value becomes equal to or less than a reference value. Wherein the means for controlling the power generation voltage of the generator from operating conditions, and means for power supply voltage to the integrated low time t ₁ from the reference value, means for accumulating the time power supply voltage is greater than or equal to the reference value t ₂ Means for comparing each integrated time difference t ₂ -t ₁ with a reference value, and means for prohibiting output of a command value for reducing the generated voltage when the integrated time difference t ₂ -t ₁ becomes equal to or less than the reference value. A control device for a vehicle generator, comprising: