JP3167880B2 - Hybrid car power generator - Google Patents

Abstract

PURPOSE: To provide the generator for a hybrid vehicle in which the generating output of the generator can be enhanced without supplying excess voltage to a battery and an on-vehicle electric component using the battery as its power source while obtaining the regenerative brake force of a traveling motor and which can effectively generate corresponding to the power consumption of the battery. CONSTITUTION: The generator for a hybrid vehicle comprises a target generating amount setter 19 for setting the value obtained by subtracting the dynamically generating amount of a traveling motor 2 from a predetermined reference generating amount of the allowable voltage supply amount or less of a battery 1 and an on-vehicle electric component 3 using the battery 1 as a power source at the time of regeneratively braking of the motor 2, as the target generating amount of the generator 6, and a target number-of-revolutions setter 20 for setting the target number of revolutions of the engine 5 from the amount 19, wherein the engine 5 and the generator 6 are controlled according to the target generating amount and the target number of revolutions.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a power generator for a hybrid vehicle.

[0002]

2. Description of the Related Art In an electric vehicle that runs by the driving force of a running electric motor that uses a battery as a power source, a vehicle is provided with a generator that uses an engine as a driving source. There is known a so-called hybrid vehicle in which the battery is charged or power consumption of the battery is suppressed by supplying power to various on-vehicle electrical components using the power as a power source. In this type of hybrid vehicle, the engine and the generator are controlled so that the generator generates power at a constant power generation output, or a power generation output corresponding to the driving power of the vehicle accompanied by battery power consumption is generated. Control of an engine and a generator is performed so as to be tight.

On the other hand, in an electric vehicle including this type of hybrid vehicle, when decelerating or braking during running, it is usual to perform regenerative braking of a running motor and recover the regenerative power output to a battery. Is being done. Therefore,
In the above-described hybrid vehicle that performs regenerative braking of the traveling motor, only the power output of the generator is supplied to the battery or the like when the traveling motor is driven, while the generator is regenerated during the regenerative braking of the traveling motor. Not only the power output of
The regenerative power output of the traveling motor is also supplied to the battery and the like.

[0004] On the other hand, if power is supplied to the battery or the vehicle-mounted electric components beyond the allowable power supply amount, the battery or the vehicle-mounted electric components may be deteriorated or damaged.

[0005] For this reason, in the conventional hybrid vehicle, the power generation output of the generator is suppressed to a low level in consideration of the regenerative power output during regenerative braking of the traction motor, whereby the amount of power supplied to the battery and the like is reduced. Therefore, even when the regenerative braking of the traveling motor increases, the allowable power supply amount of the battery or the like is not exceeded.

However, since the power generation output of the generator is suppressed to a low level, the amount of power supplied to a battery or the like when driving the traveling motor with power consumption tends to be insufficient, and the charging of the battery and its power There is a disadvantage that the consumption cannot be efficiently and sufficiently suppressed.

In this case, in order to increase the power output of the generator, it is conceivable to minimize the regenerative power output by the regenerative braking of the driving motor, but the regenerative braking force of the driving motor is reduced. This is not preferable because it affects the braking force of the vehicle.

[0008]

SUMMARY OF THE INVENTION In view of the foregoing, the present invention has been made in consideration of such a situation that a regenerative braking force of a traveling electric motor is secured and a battery or a vehicle-mounted electric component using the same as a power source is supplied without excessive power supply to a generator. It is an object of the present invention to provide a power generation device for a hybrid vehicle that can achieve high output and can generate power accurately in response to power consumption of a battery.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a vehicle which travels by the driving force of a traveling motor powered by a battery and which is regeneratively braked during deceleration or braking during the traveling. A hybrid vehicle, in which a generator having an engine as a driving source is mounted on a vehicle performing power supply, and a power output of the generator is supplied to the battery and on-vehicle electrical components using the battery as a power source. At the time of regenerative braking, the regenerative power generation amount of the traveling motor was subtracted from the reference power generation amount of the generator set in advance to supply power to the battery and the on-vehicle electric components at or below the allowable power supply amount of the battery and the on-vehicle electric components. A target power generation amount setting means for obtaining a value as a target power generation amount of the generator, and causing the generator to generate power with the target power generation amount obtained by the target power generation amount setting means. Characterized in that a power generation control means for controlling the engine and the generator in order.

The reference power generation amount is determined in accordance with the vehicle speed of the hybrid vehicle so as to increase as the vehicle speed increases. The target power generation amount setting means determines that at least the power consumption of the traveling motor is substantially constant. The reference power generation amount is obtained as the target power generation amount when the traveling motor is driven during constant speed running.

Further, the target power generation amount setting means increases or decreases the reference power generation amount according to the power consumption of the driving motor when the driving motor is driven. The obtained power generation amount is obtained as the target power generation amount.

Further, the power generation control means determines a target rotation speed of the engine for generating electric power at the target power generation amount determined by the target power generation amount setting means in accordance with the target power generation amount. And controlling the engine so as to operate the engine at the determined target rotation speed.

[0013]

According to the present invention, at the time of regenerative braking of the traveling electric motor, the target electric power generation amount setting means sets the target electric power generation amount of the traveling electric motor based on the reference electric power generation amount of the generator and the allowable electric power supply amount of the battery and the vehicle-mounted electric components. A value obtained by subtracting a regenerative power generation amount is obtained as a target power generation amount of the generator, and at this time, the engine and the generator are controlled by the power generation control unit so as to generate the generator with the target power generation amount. The sum of the power generation output of the generator and the regenerative power output of the traveling motor is the reference power generation amount, which is supplied to the battery and the on-vehicle electrical components. Therefore, the amount of power supplied to the battery and the on-vehicle electrical components does not exceed the allowable amount of power supply, and the amount of regenerative power generated by the traveling motor is maintained as it is.

In this case, the reference power generation amount is determined according to the vehicle speed of the hybrid vehicle so as to increase as the vehicle speed increases, and the reference power generation amount at the time of constant speed running at least when the power consumption of the driving motor becomes substantially constant. By calculating a reference power generation amount corresponding to the vehicle speed as the target power generation amount when driving the driving motor, the vehicle speed increases and the battery power consumption increases when driving the driving motor. As a result, the generator generates power with a larger target power generation amount, and power supply to a battery or the like is performed appropriately. Then, for example, when the regenerative braking of the traveling motor is performed for deceleration or braking of the vehicle from the constant speed traveling state of the hybrid vehicle, the sum of the power generation amount of the generator and the regenerative power generation of the traveling motor becomes Since the power generation amount of the generator is controlled so that the reference power generation amount corresponds to the vehicle speed at that time, the power supply to the battery and the like is appropriately maintained at the allowable power supply amount or less.

Further, when the driving motor is driven, the reference power generation amount is increased or decreased according to the power consumption of the driving motor when the reference power generation amount is equal to or less than the allowable power supply amount of the battery and the vehicle-mounted electric components. When obtaining the power generation amount, even when the battery power consumption becomes large, for example, when the vehicle is accelerating, the power generation is performed using the power generation amount corresponding to the battery power consumption within the allowable power supply amount of the battery or the like. The power can be supplied to the battery by causing the machine to generate power.

Further, the power generation control means includes means for obtaining a target rotation speed of the engine for causing the generator to generate power at the target power generation amount in accordance with the target power generation amount. When the engine is operated, the target rotation speed is determined based on the load of the engine.For example, the driving state of the traveling motor is shifted from a driving state to a regenerative braking state, and the power generation amount of the generator is reduced. When reducing the reference power generation amount by the regenerative power generation amount of the traveling motor, the engine speed is controlled according to the decrease in the engine load due to the reduction in the power generation amount. As a result, the rotation speed of the engine is controlled with a stable change in behavior without the occurrence of a blow-up or the like.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a system configuration diagram of a hybrid vehicle equipped with the power generation device of the present embodiment, FIG. 2 is a diagram for explaining the operation of the hybrid vehicle of FIG. 1, and FIG. 3 is a target of the power generation device of the hybrid vehicle of FIG. FIG. 4 is a diagram showing a map for obtaining a power generation amount, and FIG. 4 is a diagram showing an operation state of the power generation device when the hybrid vehicle of FIG. 1 is running.

Referring to FIG. 1, a hybrid vehicle A of this embodiment has a battery 1, a traveling motor 2 (traveling motor) powered by battery 1, and on-vehicle electrical components powered by battery 1. 3, a drive control device 4 for controlling the drive of the drive motor 2, and a power generator 7 having a generator 6 (generator) driven by the engine 5 as a drive source.

The battery 1 and the traveling motor 2 are connected via a motor power supply control unit 8 including an inverter circuit for controlling the amount of power supply therebetween.

The traveling motor 2 is connected to a pair of drive wheels 10, 10 of the hybrid vehicle A via a transmission 9, and transmits the driving force to the drive wheels 10, 10 via the transmission 9 to drive the hybrid vehicle A. Let me run.

The travel control device 4 comprises a microcomputer or the like. The travel control device 4 includes an accelerator sensor 11 for detecting an accelerator operation amount A.
A brake switch 12 for detecting a brake operation;
Detection signals are input from a vehicle speed sensor 13 for detecting the vehicle speed VCAR. The travel control device 4 basically controls the power supply amount from the battery 1 to the travel motor 2 so as to generate the drive force corresponding to the accelerator operation amount A and the vehicle speed VCAR to the travel motor 2. Control is performed via the unit 8.

The traveling control device 4 is adapted to operate the motor when the brake switch 12 detects that the brake operation has been performed or when the accelerator operation amount A obtained from the accelerator sensor 11 is reduced. The regenerative braking of the traveling motor 2 is performed via the power supply control unit 8, and the power output of the traveling motor 2 by the regenerative braking is supplied to the battery 1 and the on-vehicle electrical component 3 via the motor power supply control unit 8. In this case, the traveling control device 4 performs regenerative braking of the traveling motor 2 such that the regenerative power generation amount of the traveling motor 2 becomes a power generation amount corresponding to the vehicle speed VCAR as shown by a solid line a in FIG. The larger the vehicle speed VCAR, the greater the amount of regenerative power generated. Therefore, as the vehicle speed VCAR increases,
The braking force during regenerative braking increases.

The traveling control device 4 includes a vehicle speed sensor 13
And outputs a signal indicating that the vehicle speed VCAR is obtained during regenerative braking of the traveling motor 2 to the power generation management device 15 of the power generation device 7 to be described later.

The power generator 7 includes, in addition to the engine 5 and the generator 6, a generator power supply control unit 14 including an inverter circuit for controlling the amount of power supplied from the generator 6 to the battery 1 and the on-vehicle electrical components 3. Power generation management device 15 that performs overall management and control of the operation of the engine 5 and the generator 6 at the time of operation, and an engine controller 1 that controls the operation of the engine 5 in accordance with instructions from the power generation management device 15
6 (hereinafter, referred to as an ECU 16), and a generator controller 17 (hereinafter, referred to as a GCU 17) that controls the operation of the generator 6 through a generator power supply control unit 14 in accordance with an instruction from the power generation management device 15. Generator 6 is connected to a crankshaft (not shown) of engine 5.

Power generation management device 15, ECU 16 and GCU
Reference numeral 17 denotes a microcomputer or the like. The power generation management device 15 includes a vehicle speed VCAR detected by the vehicle speed sensor 13 from the travel control device 4.
And a detection signal of a motor power detector 18 for detecting the power consumption PM of the traveling motor 2 based on the conduction current and the conduction voltage of the traveling motor 2 detected by a current sensor or a voltage sensor (not shown). Is entered.
Then, the power generation management device 15 has, as its functional configuration,
Given vehicle speed VCAR and power consumption PM of traveling motor 2
Power generation setting section 19 (target power generation setting means) for obtaining a target power generation of the generator 6 based on the engine power, and an engine 5 necessary for generating power from the generator 6 with the target power generation.
A target rotation speed setting unit 20 for obtaining the target rotation speed of
The ECU 16 and the GC
Instruct U17.

In this case, the ECU 16 controls the power generation management device 1
5, a throttle operation amount of the engine 5 for operating the engine 5 at the target rotation speed is determined based on a target power generation amount and a target rotation speed designated by the control unit 5 in accordance with a predetermined arithmetic expression or the like;
According to the determined throttle operation amount, the throttle operation of the engine 5 is performed via an actuator (not shown).

The GCU 17 supplies power from the generator 6 to the battery 1 and the like at the target power generation amount in accordance with a predetermined arithmetic expression or the like based on the target power generation amount and the target rotation speed instructed by the power generation management device 15. The power supply amount of the generator 6 is determined, and the power supply control of the generator 6 is performed via the generator power supply control unit 14 according to the determined power supply amount.

It should be noted that the power generation management device 15, the ECU 16 and the GCU 17 correspond to the power generation control means 2 corresponding to the configuration of the present invention.
1.

Next, the operation of the power generator 7 of the hybrid vehicle A according to the present embodiment will be described.

When the hybrid vehicle A is running, the target power generation amount setting unit 19 of the power generation management device 15 determines the vehicle speed VCAR and the power consumption PM of the traveling motor 2 given from the traveling control device 4 and the motor power detector 18, respectively. The target power generation amount is obtained according to a predetermined map shown in FIG.

Here, in the map of FIG. 3, the power consumption PM of a positive value indicates the power consumption when the driving motor 2 is driven, and the power consumption PM of a negative value indicates the regenerative braking of the driving motor 2. Power consumption at the time, that is, the regenerative power generation amount. In the map shown in FIG. 3, the target power generation amount is basically determined so that the target power generation amount increases as the vehicle speed VCAR increases. In particular, the constant speed of the hybrid vehicle A driven by the traveling motor 2 is determined. The target power generation during traveling (at this time, the power consumption PM of the traveling motor 2 is determined to be a certain positive value corresponding to the vehicle speed VCAR) has a characteristic shown by a solid line b in FIG. Stipulated. Here, a solid line b in FIG. 2 indicates a reference power generation amount of the generator 6, and the reference power generation amount corresponds to the traveling motor 2 at a constant speed at each vehicle speed VCAR accompanied by the power consumption of the traveling motor 2. The power generation amount of the generator 6 is set so as not to exceed the allowable power supply amount (rated value) of the battery 1 and the on-vehicle electrical component 3 while supplying power to the battery 1 in accordance with the power consumption PM of the battery 6.

Further, in the map shown in FIG.
The target power generation amount at various power consumptions PW of the traveling motor 2 at R is set to a value obtained by increasing or decreasing the reference power generation amount according to the power consumption PM within the allowable power supply amount of the battery 1 or the like. Specifically, the power consumption PM is set to increase as the positive value increases. In particular, during regenerative braking when the power consumption PM of the traveling motor 2 becomes a negative value, the target power generation at each vehicle speed VCAR is calculated from the reference power generation indicated by the solid line b in FIG. 2 corresponding to the vehicle speed VCAR. A value obtained by subtracting the amount of regenerative power generated by the traveling motor 2 indicated by the solid line a in the figure corresponding to the vehicle speed VCAR is determined.

In the power generation management device 15 that has obtained the target power generation amount according to such a map, the target rotation speed setting unit 20 obtains the target rotation speed of the engine 5 from the target power generation amount according to the table shown in Table 1 below.

[0034]

[Table 1]

In this case, the target rotation speed in the table of Table 1 is predetermined as a rotation speed of the engine 5 that can operate the engine 5 with an output corresponding to the target power generation amount.

The power generation management device 15 that has obtained the target power generation amount and the target rotation speed as described above outputs the target power generation amount and the target rotation speed to the ECU 16 and the GCU 17.

At this time, as described above, the ECU 16
The throttle operation amount of the engine 5 is determined from the target power generation amount and the target rotation speed according to a predetermined arithmetic expression or the like, and the throttle operation of the engine 5 is performed via an actuator (not shown) according to the determined throttle operation amount. Thus, the rotation speed of the engine 5 is controlled to the target rotation speed.

The GCU 17 determines the power supply amount of the generator 6 from the target power generation amount and the target rotation speed in accordance with a predetermined arithmetic expression or the like, and controls the power supply control of the generator 6 according to the determined power supply amount. Let's do it through. As a result, the generator 6 generates power with the target power generation amount by driving the engine 5 controlled to the target rotation speed, and supplies the power generation output to the battery 1 and the on-vehicle electrical component 3.

By controlling the power generating device 7 as described above, for example, when the hybrid vehicle A is driven at a constant speed or accelerated by driving the traveling motor 2, the generator 6 generates the vehicle speed VCAR or the traveling motor 2 based on the acceleration. Since the power is generated with an amount of power generation corresponding to the increase in the power consumption of the battery 1 and is generated with an amount of power generation within the allowable power supply amount of the battery 1 and the like, and the power generation output is supplied to the battery 1 and the like,
Is efficiently and appropriately charged according to the power consumption based on the driving of the traveling motor 2, and the power is not supplied to the battery 1 or the like beyond the allowable power supply amount.

Further, for example, when the regenerative braking of the traveling motor 2 is performed from a constant speed running state in which the generator 6 is generating power with the reference power generation amount, the power generation amount of the generator 6 2 is controlled so that the sum of the regenerative power generation amount and the regenerative power generation amount becomes the reference power generation amount.
For example, within the allowable power supply amount, power is continuously supplied at an appropriate power supply amount corresponding to the vehicle speed VCAR, the battery 1 is efficiently charged, and excessive power is supplied to the battery 1 and the like. Not even.

In this case, the amount of power generated by the generator 6 is reduced by the amount of regenerative power generation compared to when the traveling motor 2 is driven, and the load on the engine 5 is reduced. Since the rotation speed corresponding to the power generation amount of the corresponding generator 6 is controlled as the target rotation speed,
The engine 5 operates stably without the engine 5 blowing up due to the decrease in the load of the engine 5. Therefore, good exhaust performance and vibration performance of the engine 5 can be secured.

FIG. 4 shows an operation state of the power generator 7 when the hybrid vehicle A of this embodiment is actually driven. FIG.
(A) is a diagram showing a change in the vehicle speed VCAR, FIG.
FIGS. 3B to 3D are diagrams illustrating changes in power consumption PM of the traveling motor 2, the amount of power generated by the generator 6, and the number of revolutions of the engine 5 during traveling, respectively.

As can be seen from FIG. 4, the power generation amount of the generator 6 and the rotation speed of the engine 5 are substantially equal to the vehicle speed VCAR.
It changes so as to follow the change of. At the time of regenerative braking in which the power consumption PM of the traveling motor 2 becomes negative (vehicle speed V
The amount of power generated by the generator 6 (when the CAR decreases) immediately decreases as the power consumption PM of the traveling motor 2 increases to the negative side. Further, at this time, the rotation speed of the engine 5 decreases without generating a blow-up according to the decrease in the amount of power generated by the generator 6.

[0044]

As is clear from the above description, according to the present invention, during regenerative braking of the running motor, the running power of the running motor is determined based on the reference power generation of the battery and the allowable power supply of the on-vehicle electrical components. A value obtained by subtracting the regenerative power generation amount is obtained as a target power generation amount of the generator, and the engine and the generator are controlled in accordance with the target power generation amount. The generator can generate electric power without excessively supplying electric power to the on-vehicle electrical components as a power source, and therefore, it is possible to increase the output of the generator when the driving motor is driven.

The reference power generation amount is determined in accordance with the vehicle speed of the hybrid vehicle so as to increase as the vehicle speed increases, and at least at the time of constant-speed running, the power consumption of the running motor becomes substantially constant. By obtaining a reference power generation amount corresponding to the vehicle speed as a target power generation amount when driving the vehicle, when driving the driving motor, an accurate power generation corresponding to the power consumption of the battery corresponding to the vehicle speed by the driving motor is obtained. The power generation of the generator can be performed with an amount of power and a power generation amount equal to or less than an allowable power supply amount of a battery or the like. The total amount of power supplied to the motor can be maintained equal to the amount of power supplied when the traveling motor is driven.

Further, when the driving motor is driven, the reference power generation amount is increased or decreased according to the power consumption of the driving motor when the reference power generation amount is equal to or less than the allowable power supply amount of the battery and the on-vehicle electrical components. By obtaining the power, the generator can be generated with an accurate power generation output corresponding to the power consumption of the battery even at the time of acceleration of the hybrid vehicle or the like. It can be charged efficiently with an appropriate amount of power generation.

Further, a target rotation speed of the engine for generating power from the generator at the obtained target power generation amount is determined according to the target power generation amount, and the engine is controlled so as to operate the engine at the target rotation speed. In the case where the amount of power generated by the generator suddenly changes and the load on the engine changes suddenly, for example, when the amount of power generated by the generator decreases due to the transition of the driving motor from the driving state to the regenerative braking state, It can be operated stably without generating a blow-up or the like in accordance with a change in load, and the exhaust performance and vibration performance of the engine can be improved.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a hybrid vehicle including a power generation device according to an example of the present invention.

FIG. 2 is a diagram for explaining the operation of the power generator of the hybrid vehicle in FIG. 1;

FIG. 3 is a diagram showing a map for obtaining a target power generation amount of the power generation device of the hybrid vehicle in FIG. 1;

FIG. 4 is a diagram showing an operation state of the power generation device when the hybrid vehicle of FIG. 1 is traveling.

[Explanation of symbols]

A: hybrid vehicle, 1 ... battery, 2 ... traveling motor, 3 ... on-board electrical equipment, 5 ... engine, 6 ... generator, 7 ...
Power generation device, 19: target power generation amount setting means, 20: target rotation speed setting means, 21: power generation control means.

──────────────────────────────────────────────────続 き Continuation of the front page (51) Int.Cl. ⁷ identification code FI H02J 7/32 B60K 9/00 E (56) References JP-A-7-236203 (JP, A) JP-A-8-79911 ( JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B60L 7/22 B60K 6/02 B60L 11/02-11/14 H02J 7/00 H02J 7/16 H02J 7/32

Claims (4)

(57) [Claims] 1. A generator that uses an engine as a drive source and is mounted on a vehicle that runs with the driving force of a running motor that uses a battery as a power source and performs regenerative braking of the running motor when decelerating or braking during the running. And a power generator for a hybrid vehicle that supplies power generated by the generator to the battery and on-vehicle electrical components using the battery as a power source, when the regenerative braking of the traveling motor is performed, Hereinafter, a target power generation setting in which a value obtained by subtracting a regenerative power generation of the traveling motor from a reference power generation of the generator predetermined to supply power to the battery and on-vehicle electrical components is obtained as a target power generation of the generator. Means, and power generation control means for controlling the engine and the generator so that the generator generates power at the target power generation amount determined by the target power generation amount setting means. Wherein the reference power generation is the hive
The higher the vehicle speed of the lid vehicle, the higher the vehicle speed.
The target power generation amount setting means is at least
Constant-speed running where the power consumption of the running motor is substantially constant
At the time of driving of the traveling motor at the time
Is calculated as the target power generation amount . 2. The target power generation amount setting means increases or decreases the reference power generation amount in accordance with the power consumption of the traveling motor when the driving motor is driven. The power generation device for a hybrid vehicle according to claim 1 , wherein the generated power amount is obtained as the target power generation amount. 3. The power generation control means determines a target rotation speed of the engine for generating power from the generator with the target power generation amount determined by the target power generation amount setting means in accordance with the target power generation amount. The power generator for a hybrid vehicle according to claim 1 or 2, wherein the engine is controlled so as to operate the engine at the determined target rotation speed. 4. Driving of a traveling motor using a battery as a power source.
When traveling by force and decelerating or braking during traveling,
A vehicle that performs regenerative braking of the traveling electric motor
Is mounted as a drive source, and the power output of the generator is
For the battery and on-vehicle electrical components using the battery as a power source
In the power generation device of a hybrid vehicle to be supplied with power,
When the regenerative braking of the electric motor
Power to the battery and on-vehicle electrical components below the
From the reference power generation of the generator
The value obtained by subtracting the regenerative power generation amount of the traveling motor is
Target power generation amount setting means for obtaining the target power generation amount of
The target power generation amount determined by the target power generation
Control the engine and generator to generate electric power
Power generation control means, wherein the power generation control means
With the target power generation amount determined by the target power generation amount setting means
Target engine speed for generating power from the generator
Is provided according to the target power generation amount.
Operating the engine at a target speed
Power generation equipment for hybrid vehicles characterized by controlling
Place.