JP2003134894A - Controller for vehicle generator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the change of running torque while changing the quantity of power generation in a generator, letting it follow the change of request for generated power. SOLUTION: A power generation command being set based on electrical load energy, etc., is converted into requested generation torque by the number of revolutions (rpm) of the generator. Then, an engine torque command is compensated by the amount of the requested generation torque, while the requested generation torque is processed with a filter of a time constant equivalent to the response delay of actual engine torque to the engine torque command, thus power generation of the generator is controlled by the requested torque command, having passed the filter in question.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a vehicular generator driven by an engine that generates a driving force for a vehicle.

[0002]

2. Description of the Related Art Conventionally, in a generator driven by an engine that generates a driving force for a vehicle, a generator for a vehicle configured to control the amount of power generated by the generator in accordance with a generated power demand (electric load energy demand). A machine control device is known (see Japanese Patent Laid-Open No. 2001-169476).

In the above generator control device, the power consumption of the power generator is detected so that the difference between the current consumption and the power generation current is within a predetermined value. Was configured to control.

[0004]

By the way, in the case of a configuration in which the amount of power generation is changed by following the required change in the generated power as in the above configuration, the generated load torque changes with the required change in the amount of power generation. The running torque of the vehicle changes by the amount of change in the power generation load torque. In this way, when the running torque changes irrespective of the accelerator operation by the driver when the demand for power generation changes, the driver feels uncomfortable. There was a problem that it was necessary to cancel the accelerator operation.

Here, if the amount of power generated by the generator is made constant regardless of the electric load state, the above problem can be avoided, but in this case, the insufficient amount of power generated must be dealt with by charging and discharging the battery. Will be required. Therefore, repeated charging and discharging of the battery causes deterioration of efficiency and a decrease in battery life, and it becomes necessary to provide a large battery capacity. Furthermore, when the battery fails, the vehicle characteristics change rapidly. There is a problem that it will end up.

The present invention has been made in view of the above problems, and runs while changing the amount of power generated by a generator driven by an engine that generates the driving force of a vehicle in accordance with the required change in the generated power. An object of the present invention is to provide a control device for a vehicle generator that can avoid a change in torque.

[0007]

Therefore, according to the first aspect of the invention, the amount of power generation in the generator driven by the engine that generates the driving force of the vehicle is controlled according to the required value.
The configuration is such that the output of the engine is corrected when the power generation amount required value of the generator changes. According to the above configuration, the power generation amount of the generator is controlled according to the required value, and the output torque of the engine is corrected when the power generation load torque changes with the change of the required power generation amount value.

According to the second aspect of the invention, the required amount of power generation is subjected to transient response delay correction, and the amount of power generation in the generator is controlled according to the corrected required value. According to the above configuration, the output torque of the engine is corrected according to the change in the power generation amount required value, while the transient response delay correction is performed on the power generation amount required value to control the power generation amount in the generator.

According to a third aspect of the present invention, the transient response delay correction corrects the power generation amount required value with a time constant corresponding to the response delay of the engine output with respect to the engine output correction command. According to the above configuration, the required value in the power generation amount control of the generator changes in response to the fact that the actual engine output changes with a delay in response to the engine output torque correction command according to the change in the power generation amount required value. Will be done.

According to a fourth aspect of the invention, the required power generation amount value is provided as a required power generation torque according to the rotation speed of the generator. According to the above configuration, the power generation amount of the generator is controlled according to the required power generation torque, while the output torque of the engine is corrected by the change in the required power generation torque. In the invention according to claim 5, the required power generation torque is
The configuration is such that the correction is set according to the power generation efficiency of the generator.

According to the above configuration, the required power generation torque is corrected by the power generation efficiency (loss such as friction) of the generator, the amount of power generation of the generator is controlled by the corrected required power generation torque, and the correction is performed. The output torque of the engine is corrected by the amount of change in the required power generation torque. In the invention according to claim 6, the power generation efficiency is estimated according to the rotation speed of the generator and the required power generation torque.

According to the above configuration, different power generation efficiencies are estimated depending on the rotational speed of the generator and the required power generation torque, and the required power generation torque is corrected according to the estimated power generation efficiency.

[0013]

According to the first aspect of the present invention, the output torque of the engine is corrected by the amount of change in the power generation load torque that accompanies the change in the required power generation amount, so that the vehicle running torque when the required power generation amount changes. There is an effect that the change of can be avoided and the drivability of the vehicle can be improved.

According to the second aspect of the present invention, the power generation load torque can be changed in correspondence with the delay in the change of the actual output torque with respect to the engine output torque correction command.
There is an effect that the change in the vehicle running torque due to the change in the required power generation amount can be offset by the correction of the engine output torque. According to the invention described in claim 3, the effect that the power generation load torque and the engine output torque are accurately synchronized and changed, and the change in the vehicle running torque due to the change in the required power generation amount can be offset with high accuracy. There is.

According to the fourth aspect of the invention, there is an effect that the engine output torque can be accurately corrected by the amount of change in the generated load torque. According to the invention described in claim 5, by correcting the required power generation torque according to the power generation efficiency, it is possible to accurately control the power generation amount of the generator in accordance with the request.

According to the invention described in claim 6, it is possible to accurately correct the required power generation torque according to the power generation efficiency in response to different power generation efficiencies depending on the rotation speed of the generator and the required power generation torque. There is.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. FIG. 1 is a system configuration diagram showing a control system of a vehicle engine and a vehicle generator according to an embodiment. In the system shown in FIG. 1, an engine 1 is mounted on a vehicle for generating drive torque, and drive wheels (not shown) are driven via an output shaft 1a of the engine 1.

The engine 1 is provided with a generator 2 which is driven by the engine 1 to generate electric power. The engine 1 and the generator 2 are connected by a power transmission system using gears. Specifically, a gear 4 rotatably supported by the crankshaft 3 of the engine 1 and a gear 6 rotatably supported by a drive shaft 5 of the generator 2 mesh with each other, and the generator 4 is driven by the gears 4 and 6. It is rotationally driven by the engine 1.

The power transmission system from the engine 1 to the generator 2 is not limited to the structure using the above-mentioned gear, but a combination of a pulley and a belt can be used, for example. The control unit 11 including a microcomputer outputs an engine torque command to the engine controller 12 based on the required driving force based on the accelerator opening degree and the like.

Upon receipt of the engine torque command, the control unit 11 controls the opening degree of an electronically controlled throttle valve (not shown) that performs intake throttle in order to generate a torque corresponding to the commanded torque demand value in the engine 1. By adjusting the intake air amount of the engine 1,
Further, the air-fuel ratio of the combustion mixture is controlled by controlling the fuel injection amount by a fuel injection valve (not shown).

However, as the control of the engine 1 corresponding to the engine torque command, there are various known engine output torques that can change the known engine output torque, such as the control of the intake air amount by changing the operating characteristic of the intake valve and the control of the ignition timing. Control can be applied. Further, the control unit 11 sets a required power generation torque based on various required power generation amount setting information, and outputs a power generation torque command (power generation control signal) to the generator 2.

The generator 2 supplies electric power to various electric loads such as an electric power steering and an electric auxiliary driving device (auxiliary driving motor) and charges the battery 7. The load controller 13 that controls the various electric loads 8 outputs a request for electric load energy to the control unit 11 as required power generation amount setting information.

Further, the battery state / battery balance energy information from the battery controller 14 that controls the charging of the battery 7 is input to the control unit 11 as required power generation amount setting information.
Further, the control unit 11 receives a detection signal from a rotation speed measurement sensor 15 that detects an engine rotation speed (rpm).

The rotation speed measuring sensor 15 is the engine 1
By detecting a detected portion provided at a constant angle on the periphery of the signal plate 16 pivotally supported by the output shaft 1a of
A pulse signal is generated for each of the detected parts. The control unit 11 measures the generation cycle of the pulse signal or the number of generations of the pulse signal within a predetermined time to obtain the engine rotation speed rpm (engine rotation speed).
Is calculated.

Here, based on the block diagram of FIG.
The details of the setting process of the engine torque command and the power generation torque command in the control unit 11 will be described. In FIG. 2, the required generated power estimation unit 110 estimates the required generated power based on the electric load energy request information and the battery state / battery balance energy information, and outputs the generated power command based on the estimation result.

Specifically, as shown in FIG. 3, the electric load energy demands of various electric loads are summed up, and further,
The generated power command is set by adding the battery balance energy information (= generated power amount-consumed energy) to this. On the other hand, the generator shaft rotation speed calculation unit 111 calculates the generator rotation speed (rpm) based on the detection signal from the rotation speed measurement sensor 15.

Specifically, the rotation speed measuring sensor 15
Engine speed calculated based on the detection signal from
m) is converted into a generator shaft speed (rpm) based on the gear ratio (or pulley ratio). The generated power command is converted into the required power generation torque in the generator 2 by being divided by the generator rotation speed (rpm).

The required power generation torque is multiplied by the gain for engine torque correction and then added to the engine torque command value, while the time constant filter corresponding to the transient response delay of the actual output torque with respect to the engine torque command is added. After being processed by 112, the generator 2 is used as a power generation torque command.
Is output to. For example, as shown in FIG. 4, when the electric load demand increases, the demand of the engine output torque is increased and corrected, and the increase of the power generation load torque is compensated by the increase of the engine output torque. It should not change as the load demand changes.

However, since the actual engine output torque changes with a delay with respect to the engine output torque command, if the requested power generation torque is output as it is, the power generation load torque is increased by the relatively quick response power generation torque command. However, the change in the actual engine output torque will be delayed, and the running torque will fluctuate. Therefore, in order to change the power generation load torque in response to the change in the actual engine output torque due to the correction of the engine output torque command, the required power generation torque is subjected to response delay correction and then output to the generator 2. is there.

As a result, the engine output torque can be changed by accurately following the change in the generated load torque, and the running torque can be stabilized without being affected by the change in the generated torque command (FIG. 4). reference). Therefore, the running torque fluctuates when the demand for generated power changes, so that the driver does not feel uncomfortable, and the driver needs to offset the fluctuation in the running torque due to the demand change in the amount of power generation by the accelerator operation. Since it does not occur, the drivability of the vehicle can be improved.

By the way, the amount of power generation actually obtained with respect to the required power generation torque of the power generator 2 is actually smaller than the required power generation power due to a loss such as friction in the power generator 2. Therefore, as in the second embodiment shown in the block diagram of FIG. 5, it is preferable to apply a correction corresponding to the loss in the generator 2 to the required power generation torque.

In the second embodiment shown in FIG. 5, a map in which the power generation efficiency (%) is stored in advance corresponding to the required power generation torque and the generator rotation speed (rpm) is provided, and the required power generation torque and power generation at that time are provided. Search the power generation efficiency corresponding to the machine speed (rpm). Then, the required power generation torque is divided by the power generation efficiency to obtain a required power generation torque in which a loss component such as friction is added, and the engine torque command is corrected according to the required power generation torque corrected by the power generation efficiency. The required power generation torque corrected by the efficiency is subjected to response delay correction and output to the generator 2.

As described above, if the required power generation torque is corrected by the power generation efficiency, the actual power generation amount close to the power generation required value can be obtained as shown in FIG. 6, and the power generation amount can be accurately controlled. can do. In the above embodiment, the required generated power is converted into the required generated torque, and the engine torque command is corrected based on the required generated torque. However, simply, the engine torque command is calculated based on the required generated power. May be corrected.

Further, instead of performing the response delay correction by processing the required power generation torque with a filter, the required power generation torque may be weighted averaged and the weighted average value may be output to the generator 2. Furthermore, in the above embodiment, the required power generation torque is always added to the engine torque command. However, the engine torque command is corrected with a correction value according to the change margin of the required power generation torque, and then the correction value is gradually reduced. Therefore, the engine torque command may be corrected only when the required power generation torque changes.

[Brief description of drawings]

FIG. 1 is a system configuration diagram showing a control system for a vehicle engine and a generator according to an embodiment.

FIG. 2 is a block diagram showing details of setting control of an engine torque command and a power generation torque command in the embodiment.

FIG. 3 is a block diagram showing a process of estimating required generated power according to the embodiment.

FIG. 4 is a time chart showing control characteristics and effects in the embodiment.

FIG. 5 is a block diagram showing setting control of an engine torque command and a power generation torque command in the second embodiment.

FIG. 6 is a diagram for explaining the effect of the second embodiment.

[Explanation of symbols]

1 ... engine 2 ... Generator 3 ... crankshaft 4, 6 ... Gear 5 ... Drive shaft 7 ... Battery 8 ... Electric load 11 ... Control unit 12 ... Engine controller 13 ... Load controller 14 ... Battery controller 15 ... Rotation speed measurement sensor 110 ... Required generated power estimation unit 111 ... Generator rotation speed calculation unit 112 ... Filter

Claims (6)

[Claims] 1. A controller for a vehicle generator that controls the amount of power generation in a generator driven by an engine that generates a driving force of a vehicle in accordance with a required value, wherein when the required amount of power generation changes, A controller for a vehicle generator, which corrects the output of the engine. 2. The vehicular generator according to claim 1, wherein a transient response delay correction is applied to the power generation amount demand value, and the power generation amount in the generator is controlled according to the corrected demand value. Control device. 3. The vehicular power generation according to claim 2, wherein the transient response delay correction corrects the power generation amount required value with a time constant corresponding to a response delay of an engine output with respect to an engine output correction command. Machine control device. 4. The vehicle generator according to any one of claims 1 to 3, wherein the power generation amount required value is given as a required power generation torque according to the rotation speed of the generator. Control device. 5. The control device for a vehicle generator according to claim 4, wherein the required power generation torque is corrected and set according to the power generation efficiency of the power generator. 6. The control device for a vehicle generator according to claim 5, wherein the power generation efficiency is estimated in accordance with a rotation speed of the generator and a required power generation torque.