JP3055439B2 - Power generation control device for hybrid electric vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To charge a battery before the charging rate of a power source is lowered even when the temperature of the power source is low or the power source is deteriorated by controlling the generator on the basis of the operating state of a vehicle and the real output of the motor. SOLUTION: When the real output D is judged lower than the set real output value, operation commands are output to an engine 4 and a generator 5, power generation is started to execute the charging of a battery 1. Accordingly, when the charging rate A of the battery 1 reaches a predetermined value or less, the generation is immediately started to execute charging, and hence the output decrease of the motor 3 can be prevented. If the output of the motor 3 is insufficient for the driver's desired output, the generation is started to execute charging. Thus, even if the charging rate A of the battery 1 is sufficient, if the temperature of the battery 1 is low or the battery 1 is deteriorated, the generation is started to execute charging, and hence the output decrease of the motor 3 can be effectively prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generation control device for generating power in a hybrid electric vehicle using a motor as a driving source for driving without the output of the motor being reduced by a mounted generator.

[0002]

2. Description of the Related Art A hybrid electric vehicle using a motor as a driving source is driven by a motor using a battery (battery) as a power source, and the battery is charged by a generator operated by a prime mover. This ensures the output of the motor. In general, a hybrid electric vehicle travels by driving an electric motor only with a battery, or by driving an electric generator by a prime mover to charge the battery from the electric generator while supplying electric power from the generator to the electric motor. There are cases. Usually, the vehicle is driven by driving the electric motor only with the battery, and when the charging rate of the battery becomes equal to or less than a preset value, the generator is operated to charge the battery. This allows the hybrid electric vehicle to maintain a predetermined power performance.

[0003]

In a conventional power generation control device for a hybrid electric vehicle, a battery is charged by a generator based on a charging rate so that the output of the motor maintains a predetermined power performance. . However, when the temperature of the battery is low or the battery is deteriorated, the output of the battery is reduced even if the charging rate exceeds a preset value, and the output of the electric motor is reduced, and power performance such as acceleration and speed is reduced. There is a possibility that it will decrease.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide a power generation control device for a hybrid electric vehicle that can perform power generation in a state where the output of a motor does not decrease.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides an electric motor driven by power supply from a power supply device to drive driving wheels of a vehicle, and an electric motor connected to the power supply device and the electric motor. In a hybrid electric vehicle equipped with a generator for supplying the motor and a prime mover that operates the generator by being driven, an operating state detecting unit that detects an operating state of the vehicle, and an actual output generated in the electric motor. An actual output detecting means for detecting, and an operation of the generator by driving the prime mover based on an operating state of the vehicle detected by the operating state detecting means and an actual output of the motor detected by the actual output detecting means. Control means for controlling the operation state detecting means.
The vehicle set based on information detected by the step
To the instruction output to the actual output detection means.
The ratio with the actual output of the electric motor is set at a preset ratio.
Rate and drive the prime mover based on the result of the comparison.
A function of controlling the operation of the generator by
The actual output of the motor is insufficient for the required output of the state.
When it is determined that there is a
It is characterized by supplying electricity to the power supply device .

Further, the power supply device has a power storage function of storing electricity by being charged by the generator, and the power supply device is provided with a storage amount detecting means for detecting a remaining capacity of electricity, and the control means is provided with the control means. After comparing the state of charge of electricity detected by the charged amount detection means with a predetermined value set in advance, the power generation by driving the prime mover based on the detection information of the operation state detection means and the actual output detection means. A feature is provided that controls the operation of the machine, and a difference occurs between the actual output and the instruction output that is the driving state of the vehicle even when the remaining capacity of electricity of the power supply device is equal to or greater than a predetermined value. In such a case, the generator is operated by the prime mover to charge the power supply device.

[0007] Also, the hybrid electric vehicle, an electric motor for driving the driving wheels of the vehicle is operated by feeding from the power supply, a generator for supplying electricity to said power supply device and the electric motor is operated A power generator for driving the generator , wherein a maximum output of the generator is smaller than a maximum allowable input of the motor. Then, when the control unit performs a comparison with the set ratio, when it is determined that the actual output of the electric motor detected by the actual output detection unit is equal to or less than a preset actual output value, It may have a function of starting the operation of the generator by driving the prime mover,
When the actual output of the motor is equal to or less than a preset actual output value, the operation of the generator is started and the output of the motor can be secured. Further, as the driving state detecting means, an operation detecting means for detecting an operating state of the vehicle by a driver and a running state detecting means for detecting a running state of the vehicle are applied.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration of a hybrid electric vehicle provided with a power generation control device according to one embodiment of the present invention, FIG. 2 is a block configuration of the control device, and FIG. FIG. 4 shows a flow chart, and a graph showing the state of the output of the electric motor with respect to the elapsed time.

As shown in FIG. 1, a battery 1 as a power supply is mounted on a hybrid electric vehicle, and the battery 1 is electrically connected to a motor 3 as a motor via a motor controller 2. The motor 3 is connected to a drive wheel side of a vehicle (not shown), and the hybrid electric vehicle runs by driving the motor 3. On the other hand, an engine 4 as a prime mover is mounted on the hybrid electric vehicle, and the output side of the engine 4 includes a battery 1 and a motor 3.
The generator 5 which supplies electricity to the power supply is connected. When the generator 5 is operated by driving the engine 4, the battery 1 is charged. The operations of the engine 4 and the generator 5 are controlled based on a command from the control device 6.

On the other hand, the accelerator pedal 7 is provided with an accelerator opening sensor 8 as operation detecting means, and an output corresponding to the amount of depression of the accelerator pedal 7 by the driver is input to the motor controller 2 and the control device 6. An instruction output to the motor 3 is set in the motor controller 2 by an output signal of the accelerator opening sensor 8, and the motor 3 is driven according to the instruction output to the motor 3. The motor controller 2 is provided with an actual output detecting means 9 for detecting an actual output (actual output) of the motor 3. A motor instruction output is inputted to the control device 6 and the motor detected by the actual output detecting means 9 is inputted. 3 is input. Also, battery 1
Is provided with a remaining capacity meter 10 as a charged amount detecting means, and the remaining capacity meter 10 detects the remaining capacity of the battery 1. The detection information of the remaining capacity meter 10 is input to the control device 6.

As shown in FIG. 2, the control device 6 is provided with a calculation means 11, a determination means 12, and an instruction means 13. The calculation unit 11 receives the detection information of the actual output detection unit 9 and the output signal of the accelerator opening sensor 8, and the determination unit 12 detects the detection information of the remaining capacity meter 10 and the calculation unit 11.
Is input. Further, the control device 6 includes a storage unit 14, and the storage unit 14 stores various preset values. The information stored in the storage unit 14 is input to the determination unit 12, the calculation result information is compared with the storage information, and the determination result information is input to the instruction unit 13. The instruction unit 13 outputs an operation instruction to the engine 4 and the generator 5 based on the input determination result information.

That is, the determination means 12 includes the remaining capacity meter 10
, The charging rate A of the battery 1 is input.
The storage means 14 previously stores a lower limit value (predetermined value) a of the remaining capacity of electricity of the battery 1, and the determination means 12 compares the predetermined value a stored in the storage means 14 with the charging rate A, and remaining capacity of that look like if sufficient or not is determined.

An instruction output P, which is the acceleration or speed required of the vehicle, is obtained by the motor controller 2 based on the information of the output signal of the accelerator opening sensor 8 and calculated by the arithmetic means 11.
The actual output D of the motor 3 is input to the calculating means 11 based on the detection information of the actual output detecting means 9. In the arithmetic means 11, the actual output D and the instruction output P
Is calculated (actual output D / instruction output P). The storage unit 14 previously stores a set value (set ratio b) of the ratio B between the actual output D and the instruction output P of the motor 3, and the determination unit 12 compares the ratio B with the set ratio b. By comparing the ratio B with the set ratio b, the driver's accelerator pedal 7
Output corresponding to the amount of depression is that looks like whether obtained by the motor 3 is judged.

Further, the storage means 14 stores a lower limit set value (set actual output value) c of the actual output D of the motor 3, and the judging means 12 compares the actual output D of the motor 3 with the set actual output value c. is, that look like whether the actual output D of the motor 3 is reached the limit is determined.

Although the accelerator opening sensor 8 which directly reflects the driver's intention has been described as an example of the driving state detecting means, the output control of the motor 3 is performed irrespective of the depression of the accelerator pedal 7 when traveling uphill. In the case of a vehicle or the like that is controlled so as to keep the output of the vehicle constant, the driving is performed based on information instructed to the motor 3, that is, based on information of running state detecting means for detecting the running state of the vehicle. Ru also possible der to determine the state. The maximum amount of electric power generated by the generator 5 is Ru der smaller than the allowable maximum input of the motor 3.

The operation of the power generation start process by the above-described power generation control device will be described with reference to FIGS.

As shown in FIG. 3, in step S1, it is determined whether or not the charging rate A of the battery 1 exceeds a predetermined value a, and it is determined that the charging rate A of the battery 1 is not more than the predetermined value a. In this case, the process proceeds to step S2. Step S
In step 2, an operation command is output to the engine 4 and the generator 5 based on various conditions, power generation is started by controlling the exciting current, and the battery 1 is charged (power generation is started).

If it is determined in step S1 that the charging rate A of the battery 1 has exceeded the predetermined value a, the process proceeds to step S1.
Proceeding to 3, the ratio B is compared with the set ratio b. That is, it is determined whether or not the ratio B (actual output D / instruction output P) between the actual output D and the instruction output P computed by the computing means 11 is smaller than the set ratio b stored in the storage means 14 in advance. Is determined. If it is determined that the ratio B is smaller than the set ratio b, the output of the motor 3 is insufficient for the driver's requested output, so the process proceeds to step S4 and proceeds to the process leading to the start of power generation. If it is determined in step S3 that the ratio B is greater than the set ratio b, an output of the motor 3 substantially corresponding to the output required by the driver has been obtained. Return.

In step S4, it is determined whether or not the actual output D of the motor 3 is lower than the set actual output value c. That is,
As shown in FIG. 4, the actual output D
Decreases over time, and the actual output D of the current motor 3
Is smaller than the set actual output value c, which is the lower limit set value. In step S4, the actual output D is equal to the set actual output value c.
If it is determined that the actual output D is lower than the point S shown in FIG. 4, the process proceeds to step S2, where an operation command is output to the engine 4 and the generator 5, and power generation is started. Then, charging of the battery 1 is executed.

Therefore, according to the above-described power generation control device,
When the charging rate A of the battery 1 becomes equal to or less than the predetermined value a, power generation is started immediately and charging is performed.
A decrease in the output of the motor 3 can be prevented. Further, in the above-described power generation control device, even if the charging rate A of the battery 1 exceeds the predetermined value a, the ratio between the actual output D of the motor 3 and the command output P required according to the depression amount of the accelerator pedal 7 When B is larger than the set ratio b, that is, when the output of the motor 3 is insufficient for the driver's requested output, power generation is started and charging is performed. For this reason, even if the charging rate A of the battery 1 is sufficient, when the temperature of the battery 1 is low or when the battery 1 is deteriorated, power generation is started and charging is performed. Can be prevented. In addition, when the output of the motor 3 is insufficient for the output required by the driver, the charging is executed if the actual output D is lower than the lower limit set value. Can be prevented. As a result, power can be generated in a state where the output of the motor 3 does not decrease, and the power performance of the hybrid electric vehicle does not decrease.

In the above embodiment, the actual output of the motor 3 is compared with the output required by the driver, and the ratio B (actual output D / instruction output P) of the actual output D and the instruction output P is compared with the set ratio b. However, the actual output D and the instruction output P may be directly compared by calculation. Further, the determination as to whether the actual output D is lower than the lower limit set value (step S4) is omitted, and when the actual output of the motor 3 is insufficient with respect to the output requested by the driver, the power generation is immediately started. Alternatively, the charging may be performed.

[0022]

According to the power generation control device for a hybrid electric vehicle of the present invention, the operation of the generator is controlled on the basis of the driving state of the vehicle and the actual output of the motor. When the output is insufficient, power generation can be started. Further, when the actual output of the electric motor becomes insufficient with respect to the operation state, power generation can be started to charge the power supply device. For this reason, even when the temperature of the power supply device is low or the power supply device is deteriorated, charging can be performed before the charging rate of the power supply device decreases. As a result, a decrease in the output of the electric motor does not occur, and a decrease in the power performance of the hybrid electric vehicle can be prevented. The maximum power generation amount of the generator is maximum allowable input is smaller than the electric motor, the electric motor under normal running conditions in order not operated at the maximum output, it is possible to generate a sufficient amount of power generation, yet those of lightweight small Therefore, it is possible to lengthen the travel of the power supply device by power storage.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a hybrid electric vehicle including a power generation control device according to one embodiment of the present invention.

FIG. 2 is a block diagram of a control device.

FIG. 3 is a flowchart of a power generation start process.

FIG. 4 is a graph showing a state of an output of a motor with respect to an elapsed time.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Battery 2 Motor controller 3 Motor 4 Engine 5 Generator 6 Control device 7 Accelerator pedal 8 Accelerator opening sensor 9 Actual output detection means 10 Remaining capacity meter 11 Calculation means 12 Judgment means 13 Instruction means 14 Storage means

Claims (3)

(57) [Claims] An electric motor which is driven by power supply from a power supply device to drive driving wheels of a vehicle, a generator which supplies electricity to the power supply device and the electric motor, and which operates the generator by being driven A driving state detecting means for detecting a driving state of the vehicle, an actual output detecting means for detecting an actual output generated in the electric motor, and a driving state detected by the driving state detecting means. Control means for controlling the operation of the generator by driving the prime mover based on the driving state of the vehicle and the actual output of the electric motor detected by the actual output detection means , wherein the control means comprises: Detected by state detection means
Instruction output to the vehicle set based on the received information
And the motor output detected by the actual output detection means.
Compare the ratio with the actual output with the preset ratio,
The power generation by driving the prime mover based on the result of the comparison
A function to control the operation of the motor is provided, and the actual output of the
When it is determined that the
A power generation control device for a hybrid electric vehicle, wherein power is supplied to a vehicle and the power supply device. 2. The power supply device has a power storage function of storing electricity by being charged by the generator, and the power supply device includes a storage amount detection unit that detects a remaining amount of electricity, and the control unit includes After comparing the state of charge of electricity detected by the charged amount detection means with a predetermined value set in advance, the power generation by driving the prime mover based on the detection information of the operation state detection means and the actual output detection means. The power generation control device for a hybrid electric vehicle according to claim 1, further comprising a function of controlling operation of the electric vehicle. Wherein the hybrid electric vehicle, an electric motor for driving the driving wheels of the vehicle is operated by feeding from the power supply, a generator for supplying electricity to said power supply device and the electric motor, to be operated The power generation control device for a hybrid electric vehicle according to claim 1, further comprising: a power generation device having a motor that drives the power generation device, and a maximum output of the power generation device is smaller than a maximum allowable input of the motor. .