JP3408974B2 - Hybrid vehicle drive device and drive method - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an engine and a motor.
The present invention relates to a drive device and a drive method for a hybrid vehicle that uses both a generator and a drive source.

[0002]

2. Description of the Related Art Conventionally, as described in Japanese Patent Application Laid-Open No. 9-65508, a hybrid vehicle that drives a generator of an engine to generate electric power and drives a traveling motor with the electric power to travel is disclosed. Are known.

[0003]

In the conventional hybrid vehicle, for reducing fuel consumption and exhaust gas purification, the drive source is appropriately switched according to the running state, for example, by starting the motor where exhaust gas becomes a problem and by driving the motor when accelerating. Has been done. Further, stopping the engine during idling is also an effective method as a measure against exhaust gas.

However, in a hybrid vehicle, in order to secure sufficient electric power in the battery to extend the mileage and to maintain good driving characteristics,
There is a problem to be solved.

As a measure against exhaust gas, for example, when the vehicle is stopped temporarily such as when waiting for a signal, the idling of the engine is stopped to reduce the emission amount of harmful exhaust gas. After that, even if an attempt is made to restart the engine, if the battery does not have sufficient power, the engine cannot be restarted smoothly and accelerated operation cannot be performed. Further, if the environmental conditions such as the cooling water temperature of the engine are not within an appropriate range when the vehicle is temporarily stopped, the engine may not be able to be restarted smoothly immediately after that.

An object of the present invention is to overcome the above problems and provide a driving apparatus and a driving method for a hybrid vehicle which has an excellent driving characteristic while always ensuring sufficient electric power in a battery.

Another object of the present invention is to smoothly restart or accelerate after idling is stopped when the idling of the engine is stopped when the vehicle is temporarily stopped to reduce the emission of harmful exhaust gas as a measure against exhaust gas. It is an object of the present invention to provide a drive device and a drive method for a hybrid vehicle that can be performed by .

[0008]

In order to achieve the above object, the present invention provides an engine, a motor / generator connected to the engine, and a main connected to the motor / generator via a power converter. and a battery, and the auxiliary battery, which is connected to the main battery, auxiliary device server
Auxiliary machine driven by electricity supplied from battery
And a controller for controlling the engine and the motor / generator, the controller comprising :
Depending on the charging rate of the vehicle operating state and the main battery has a plurality of operating modes for controlling the engine and the motor / generator, said Meinba
VBMH and VBML are two predetermined values for battery charge rate.
(However, VBMH> VBML), the charging rate of the main battery is higher than one of the two predetermined values (VBMH).
Is low and the opening of the accelerator that operates the engine is
When it is smaller than the fixed value TA and when the main battery
The charging rate is lower than the other of the two specified values (VBML)
And the opening degree of the accelerator is larger than the predetermined value TA.
Time, operating the engine as a driving source of a car and the motor / generator, the electric power generated by the motor / generator and the engine running and generation mode to recover the main battery, the charging rate of the main battery is the 2 Higher than or equal to the other of the two given values (VBML)
When the accelerator opening is larger than the predetermined value TA
Is an acceleration mode in which the engine and the motor / generator are used as driving sources for the vehicle, and the charging rate of the main battery is one of the two predetermined values (VBMH).
And the accelerator opening is greater than the predetermined value TA
If it is too small, the engine drive mode is set in which only the engine is used as the drive source for the car, and the key switch is turned on.
The accelerator is off and the vehicle speed is below a specified value.
Below, the charging rate of the main battery is
More than the other specified value (VBML) and the engine is cold.
The tilt angle of the vehicle where the water temperature is above a specified value or is stopped is
Engine that stops the engine when the value is below a certain value
After stopping the engine, set the key switch to the stop mode.
Switch is on and the accelerator is on,
Start to start the engine with a motor / generator
Mode to.

Another feature of the present invention is that the controller sets the accelerator off and the engine stop mode.
If the above does not hold, the engine idling operation
And then the engine stop mode is established.
In some cases, the engine is stopped .

Another feature of the present invention is that the controller responds to the opening of the accelerator during the acceleration mode.
A torque command is given to the motor / generator .

Another feature of the present invention is an engine, a motor / generator connected to the engine, and the motor / generator.
The main battery connected to the generator through the power converter, the auxiliary battery connected to the main battery, and the electric power supplied from the auxiliary battery.
An auxiliary equipment to be operated Te and example Bei and a controller for controlling the engine and the motor / generator in accordance with the charging rate of the vehicle operating state and the main battery
When driving a hybrid vehicle, two predetermined values for the charging rate of the main battery are VBMH and VBML.
When (BVMH> VBML), the main battery
Charging rate is lower than one of the above two predetermined values (VBMH)
And the opening degree of the accelerator that operates the engine is a predetermined value
When less than TA and charging of the main battery
The rate is lower than the other of the two predetermined values (VBML) and
The opening degree of the accelerator for operating the engine is the predetermined value T
When it is larger than A, it is set to the engine running power generation mode.
The engine and the motor / generator
It operates as a drive source and is generated by the motor / generator.
The main power is recovered by the main battery,
The charging rate of the battery is the other of the two predetermined values (VBM
L) and the accelerator opening is equal to the predetermined value TA
If it is greater than the
And driving with the motor / generator as the drive source of the car
However, the charging rate of the main battery is equal to the two predetermined values.
Higher than one (VBMH) and the opening of the accelerator is
When it is smaller than the predetermined value TA, the engine running mode is
Drive only the above engine as the drive source of the car
If the key switch is on and the accelerator is off,
And the speed of the car is less than a predetermined value, and the main battery
The charging rate of the battery is less than the other of the two predetermined values (VBML).
Above, and the temperature of the cooling water of the engine is above a predetermined value or
If the tilt angle of the stopped car is less than the specified value, the engine
As a stop mode, the engine is stopped and the engine
After the power is turned off, the key switch remains
When the cell is on, the starting mode is
The engine is started by the generator .

According to the present invention, it is possible to reduce the fuel consumption of a hybrid vehicle and improve driving characteristics such as acceleration. Especially, even if the key switch is on, if the accelerator is turned off, the engine idling will be stopped under a predetermined condition.Therefore, as a measure against exhaust gas, the engine idling will be stopped when the vehicle is temporarily stopped to reduce the emission of harmful exhaust gas. In addition, the driving operation at the time of the temporary stop can be simplified, and the restart after the stop and the acceleration operation can be smoothly performed.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows an overall configuration diagram of a hybrid vehicle drive device according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a controller, which controls the engine 2, the motor / generator 3, and the like according to the driving state of the vehicle. A clutch 9 is provided between the motor / generator 3 and the transmission 10. When the automatic transmission mechanism is adopted, the clutch 9 is omitted. motor/
The generator 3 is supplied with electric power from the main battery 5 via the inverter 4, and the electric power generated by the motor / generator 3 is charged to the main battery 5 at a required voltage via the inverter 4. 7
A is a load suitable for using a relatively high voltage as a power source, such as an electromagnetic coil of an injector of the engine 2 or an electromagnetic valve for driving a supply / exhaust valve.

The rotor 31 of the motor / generator 3 is directly connected to the crankshaft 21 of the engine 2. 32 is a stator of the motor / generator 3, and 33 is a permanent magnet. The rotor 31 of the motor / generator 3
The crankshaft 21 of the engine 2 may be connected to each other via a power transmission mechanism such as a gear.

Reference numeral 6 denotes an auxiliary battery for supplying electric power to a load 7B such as a lamp, which is a switching element (for example, FE).
It is connected to the main battery 5 via a T element) 8. The auxiliary battery 6 has about 10 switching elements 8.
It is charged from the main battery 5 by controlling on / off at a frequency of 0 KHz. The voltage of the main battery 5 is 60V
Below and higher than the auxiliary battery 6, for example 4
It is controlled to 8V or 36V. By using the main battery 5 as a power source such as an electromagnetic coil for driving the fuel injection valve of the engine 2, the response of the fuel injection valve can be improved. On the other hand, the voltage of the auxiliary battery 6 is lower than the voltage of the main battery 5, for example, 12 V or 2
It is controlled to 4V.

Since the voltage of the main battery 5 is low and electric shock can be avoided, the negative (earth) line of the main battery 5 and the auxiliary battery 6 is common,
Special wiring can be omitted. However, a two-wire system in which the plus line and the minus (earth) line of the main battery 5 and the auxiliary battery 6 are separately provided may be used if necessary.

The controller 1 controls the operation of the engine 2, the motor / generator 3, etc. according to the driving state of the vehicle and the charging state of the main battery. Motor while the car is running /
The electric power generated by the generator 3 and stored in the main battery 5 is used as a power source that replaces the engine or assists the engine at the time of start-up, acceleration or insufficient power when exhaust gas becomes a problem. Is used to drive the. Further, the obtained electric power may be used for lamps and other auxiliary electric components. However,
When the storage amount of the main battery 5 is less than or equal to a predetermined value, no power is supplied to the auxiliary equipment.

FIG. 2 shows a detailed configuration example of the controller 1. The controller 1 includes an integrated control unit 11 and a motor
/ A generator controller 12, an engine controller 13, and an auxiliary battery controller 14.

The integrated control unit 11 has an operation mode determination processing unit, and includes a key switch, an accelerator switch (accelerator on / off), an accelerator opening sensor, a brake switch, a vehicle speed sensor, a tilt switch, a battery voltage sensor, and the like. Each information is entered. The integrated control unit 11 determines the driving mode of the vehicle based on these information, calculates the driving commands NMG *, τMG *, τNE *, VBs *, S *, and outputs each driving command to the motor / generator controller 12 , The engine controller 13, the auxiliary battery controller 14, and the transmission 8.

Motor / generator controller 12
Is the operation command NMG *, τMG *, and the motor / generator 3
A PWM signal for controlling the inverter 4 is generated and output from the information on the rotation speed and the current. The motor / generator functions as an electric motor when the operation command τMG * is +, and as a generator when the operation command τMG * is −.

The engine controller 13 controls the operation command τ.
The injection amount of fuel, the ignition timing, and the opening / closing of the supply / exhaust valve are controlled based on Ne * and the engine speed N.

The auxiliary battery controller 14 controls the PW so that the voltage of the auxiliary battery matches the command VBs *.
The M signal is generated and output, the switching element 8 is chopper-controlled, and the charging rate of the auxiliary battery is maintained at a predetermined value.

FIG. 3 shows a detailed configuration example of the motor / generator controller 12. The motor / generator controller 12 uses the idiq detecting means 124, id, iq.
Current control means 125, 2/3 phase conversion means 121, PWM
The control means 122, the phase calculation means 120, and the speed calculation means 123 are provided. The speed calculation means 123 is connected to the encoder 15, and the phase calculation means 120 is connected to the magnetic pole position detection means 16. The motor / generator controller 12 further includes a torque command generator 128, Iq.
The control means 127 and the Id control means 126 are provided.

The torque command generator 128 includes a driving finger NMG.
* Or target torque command τMG * is input. When it is desired to accurately control the motor / generator rotation speed to a prescribed value, such as when cranking the engine, the operation command NMG * that directly indicates the motor / generator rotation speed NMG *
Is given. Further, when it is desired to generate a predetermined torque in the motor / generator as in the acceleration operation, the target torque command τM * is directly given. Furthermore, when the motor / generator acts as a generator,
The value of the target torque command τMG * given is negative.

When the operation command NMG * is given, the torque command calculation unit 128 causes the operation command NMG * and the encoder 15 to operate.
The torque command value τMG * is calculated based on the rotation speed calculated by the speed calculation means 123 from the pulse signal from the. Based on this torque command value τMG * or the directly applied target torque command τMG *, the Iq control means 127 calculates the command value Iq * of the q-axis current corresponding to the torque component current.
On the other hand, the command value Id * of the d-axis current is the Id control means 126.
In, the Id * that minimizes the loss is calculated based on the torque command value τMG * and the rotation speed calculated by the speed calculation means 123. In this way, the motor / generator controller 12 calculates the current command values Iq *, Id * necessary for highly efficient control of the motor / generator 3.

The IdIq detecting means 124 is a current detector 1.
3 phase AC current of motor current detected in 7
Two-phase coordinate conversion is performed and the d and q axis currents Id and Iq are processed and calculated. Based on these detected values and command values Iq *, Id *, the IdIq current control means 125 performs proportional or proportional-integral current control processing to calculate voltage command values Vq *, Vd *.

Further, in the 2 / 3-phase conversion means 121, 2-phase / 3-phase coordinate conversion is performed to generate a 3-phase AC voltage command value V.
Calculate U *, VV *, VW *. PWM control means 122
Compares the voltage command values VU *, VV *, VW * with the carrier wave signal of the triangular wave signal, and
The WM signal is generated and the inverter 4 is driven. By thus applying the PWM-controlled voltage to the motor / generator 3, the electric motor current is changed to the current command value Iq.
*, Id * is controlled.

The 2/3 phase conversion processing 121, IdIq
Phase angle θ1, which is used in the coordinate conversion processing of the detection means 124
θ2 is calculated by the phase calculation means 120 from each output of the magnetic pole position detector 16 that outputs a signal in phase with the induced voltage of the motor / generator 3 and the encoder 15 that outputs a rotation angle signal (pulse signal).

By performing such processing, the motor / generator 3 is controlled with the torque of the torque command value τM * and with high efficiency with minimum loss.

FIG. 4 shows a configuration example of the engine controller 13 and the engine controlled by the engine controller 13.

Reference numeral 20 denotes a throttle valve assembly having a throttle valve for controlling the amount of intake air, that is, a throttle body, and 21
Is connected to the air cleaner, and a plurality of intake branch pipes 22 for branching and supplying air to each cylinder of the engine 26 are connected to the outlet. Reference numeral 23 is an electronically controlled fuel injection valve attached to the intake branch pipe 22. An intake valve 24 driven by an electromagnetic valve 25 is provided on the intake side of the engine, and an exhaust valve 29 driven by an electromagnetic valve 30 is provided on the discharge side. An O2 sensor 31 is provided in the exhaust pipe 28. The engine controller 13 receives the outputs of the water temperature sensor 32, the cam angle sensor 18, the pressure sensor of the intake branch pipe 22, the throttle sensor for detecting the opening of the throttle valve, etc.
3. Control signals are output to the ignition coil 27, the ISC valve, the fuel pump 32, and the like. 31 is a fuel pump relay. Reference numeral 30 denotes a fuel chamber, and the fuel is sucked out by a fuel pump 32, pressure-regulated by a pressure regulator through a fuel pipe 33, and then the fuel injection valve 23.
Leading to. The proper injection amount of the fuel injection valve 23 is calculated and determined by the engine controller 13 based on the inputs from various sensors.

The controller 13 includes an input circuit 131, A
/ D converter 132, central processing unit 133, ROM 138,
It is configured by a computer including a RAM 139 and an output circuit 136. The input circuit 131 receives an input signal 130 (for example, a signal from an operation command τNE *, a cooling water temperature sensor, a throttle opening sensor, etc.), removes a noise component from the signal, and outputs the signal to an A / D converter. It is output to the conversion unit 132. The A / D conversion unit 132 A / D converts the signal and outputs the signal to the central processing unit 133. The central processing unit 133 takes in the A / D conversion result and stores it in the ROM 1
It has a function of performing each of the above-mentioned controls by executing a fuel injection control program stored in a medium such as 38 and a predetermined control program for other control.

The calculation result and the A / D conversion result are temporarily stored in the RAM 139, and the calculation result is output as the control output signal 137 through the output circuit 136, and the fuel injection valve 23 and the ignition coil 2 are output.
7, ISC valve, solenoid valve 25, 30 and fuel pump 3
It is used to control 2nd grade. The opening / closing timing of the solenoid valves 25, 30 is calculated based on the output of the cam angle sensor 18.

The electric power of the fuel injection valve 23, the solenoid valve 25 and the solenoid valve 30 is supplied from the battery 5.

The hybrid vehicle drive system of the present invention is shown in FIG.
It is driven based on a predetermined operation mode as shown in FIG. That is, one of a plurality of preset driving modes is selected based on the driving state of the vehicle, such as the accelerator opening or the state of the transmission, and the target torque of the vehicle or the vehicle speed is selected according to each driving mode. Determine driving conditions and select the optimum drive source from the viewpoint of reducing harmful exhaust gas and improving fuel efficiency. The target torque to be output by the drive device of the vehicle is obtained by, for example, calculation.

As shown in FIG. 5, there are the following operation modes, and one of them is selected depending on whether the accelerator or the clutch of the vehicle is on or off.

(1) Starting mode 1 When the key switch is on and the starter switch is on, the motor / generator is rotated to start the engine. As a driving command, the engine rotation is 50 to 100.
Output NMG * equivalent to RPM. Note that τNE * = 0, VB
Set s * = OFF and S * = OFF. A starter motor (not shown) may be used instead of the motor / generator.

(2) Starting mode 2 After the engine is temporarily stopped while the key switch is on, the engine is started by the motor / generator or starter motor with the accelerator switch on and the clutch off. The operation command NMG * is the same as in start mode 1.

(3) Idling mode After the engine is started, if the key switch is on, the accelerator switch is off, and the engine stop mode is not established, the engine is allowed to idle. When the charge rate of the battery is high, NMG * corresponding to the engine idling speed of 600 to 700 rpm is output as the operation command. Note that τMG * = 0, VBs * = OFF, S * = O
FF. However, when the charge rate of the main battery is low, for example, when the battery voltage VBM is below a predetermined value, a predetermined τNE * is output (τMG *> 0), the motor / generator is rotated, and the main battery is charged. Also do.

(4) Engine running power generation mode The charging rate of the main battery is a predetermined value VBMH (eg 70
%) Is not reached, use the motor / generator as a generator and run while charging the battery.
When the accelerator opening is large (more than the target torque TA),
The charging rate of the main battery is a predetermined value VBML (eg 40
%) Or less, the engine running power generation mode is set. At this time, the operation command S * = ON and VBs * = ON. Also, τ
As MG *, the engine speed equivalent value corresponding to the accelerator opening is added with the torque equivalent value for driving the motor / generator and output. The motor / generator is
For example, it produces an output of 3 KW to 4 KW at 48V. τ
NE * is a value that allows the motor / generator to generate the specified rated power.

(5) When the charge rate of the acceleration mode battery exceeds the predetermined value VBML and when the accelerator opening is large (target torque TA
Above), not only the engine but also the motor / generator is used as a power source for accelerating the vehicle. Operation command S *
= ON. Also, τMG * and τNE * are determined and output so that the acceleration torque corresponding to the accelerator opening is output by the engine and the motor / generator. In addition, VBs
* = OFF is desirable.

(6) Engine running mode When the charging rate of the battery exceeds a predetermined value (VBMH) and the accelerator opening is not large (less than the target torque TA), the engine is operated only. Operation command S * =
Turn on. Further, τMG * = 0, and τNE * outputs an engine speed equivalent value corresponding to the accelerator opening.

(7) When the regeneration mode key switch is on, the accelerator switch is off, the vehicle speed is higher than 0, and the battery charge rate has not reached the predetermined value (VBMH), the motor / generator Using it as a generator, it will decelerate while charging the battery. Operation command S * = ON, VBs * = ON, and τNE * = 0. τMG * is set to a negative value so that the motor / generator will generate a predetermined rated power.
If the brake switch is on, increase τMG * to increase the braking force. When the charge rate of the battery is more than the specified value, τMG * = 0.

(8) Engine stop mode The engine is stopped when either of the following conditions (a) or (b) is satisfied.

(A) The key switch is off.

(B) The key switch is on, the accelerator switch is off, the vehicle speed is 0, the charge rate of the battery is a predetermined value or more (or the battery voltage is a predetermined value VBML or more).
Is. As a requirement, further, the temperature of the cooling water of the engine is equal to or higher than a predetermined value TS, and the inclination angle of the vehicle body in the stopped state is a predetermined value θ.
The following may be added, for example, the case where auxiliary devices such as an air conditioner are switched off.

In the engine stop mode, the operation command S * =
OFF, VBs * = OFF, τNE * = 0, NMG * = 0.

The engine stop mode is set in consideration of vehicle restart and safety. For example, if the battery voltage is low or the engine coolant temperature is low,
When restarting after a pause, it will be difficult to start the engine. Therefore, when the engine is not suitable for restarting, the engine idling operation is continued for some time even after the accelerator switch is turned off to charge the battery or warm the engine. Also, when the vehicle temporarily stops on a slope, the engine idling operation is continued to secure the necessary torque so that the vehicle does not start under its own weight. Furthermore, when the voltage of the auxiliary battery is not sufficient to continue the operation of auxiliary equipment such as an air conditioner, the idling operation is continued to secure the necessary power.

Next, FIG. 6 is a diagram showing an outline of the operation flow of the controller 1. If the key switch is on,
Start operation in start mode 1. As the initial setting, the start mode 1 is set, the operation command NMG * of the motor / generator 3 is output, and only the motor / generator 3 is operated (steps 602 and 604). However, when the storage amount (charging rate) of the main battery 5 is less than or equal to a predetermined value, necessary measures are taken to secure the storage amount. Next, the state of the accelerator opening, clutch, key switch, etc. is detected. Further, the vehicle speed, the engine speed, the engine cooling water temperature, the inclination sensor, and the on / off states of switches of auxiliary equipment are also detected (step 606).

Further, the storage amount (charging rate) of the battery is obtained from the voltages of the main battery 5 and the auxiliary battery 6 (step 608).

Then, it is judged from the detected various values whether or not the operation mode needs to be changed (step 610). If it is necessary to change the operation mode, the operation mode is changed (step 612). Next, according to the set operation mode, the operation command NMG * or τMG *, NE *, VB *, S * is calculated and output based on the detected value (step 614). This process is repeated until the key switch is turned off. If the key switch is turned off, the operation stop processing is performed (steps 616 and 618).

FIG. 7 shows an example of the relationship between the driving conditions during traveling and the operating states of the respective drive sources, which is produced by the hybrid vehicle drive system of FIG. After the key switch is turned on (T0) and it is in the starting state, first, the motor / generator 3
To function as a motor for engine cranking to start the engine and start fuel injection. Furthermore, after the engine started and reached the idling speed (T2),
The clutch 9 is turned on and the driving force is transmitted to the vehicle. If the battery charge is low when idling,
The generator 3 is driven as a generator to charge the battery.

After the accelerator is on, that is, after the accelerator is depressed (T3), the engine speed also increases and the vehicle speed increases in accordance with the accelerator opening. When the charging rate of the battery is high and the accelerator opening, that is, the target torque is large, the acceleration mode is set, and the electric power stored in the main battery 5 drives the motor / generator 3 as a motor to help accelerate the vehicle.

When the charging rate of the battery is high, the vehicle speed exceeds SA, and the accelerator opening is relatively small (T4), the motor / generator 3 is stopped and the engine is operated only (engine operation mode). .

When the charge rate of the battery is low (T5-
T6), the engine running power generation mode is entered, and the motor / generator 3 is driven as a generator by utilizing the remaining power of the engine to charge the main battery and the auxiliary battery. When the battery is sufficiently charged, the driving of the motor / generator 3 is stopped.

After the brake is turned on and the accelerator is turned off, that is, after the depression of the accelerator is stopped (T6), the deceleration state is established. When the battery charge rate is low during deceleration, the regeneration mode is activated and the motor / generator 3
Functions as a generator that uses the inertial energy of the vehicle, and recovers power to the main battery 5. When the battery is sufficiently charged, the driving of the motor / generator 3 is stopped.

When the vehicle speed is reduced to a predetermined value, for example, zero (T7) with the accelerator off, it is determined whether the engine stop mode is established. Even if the key switch is on, if the accelerator switch is off, the vehicle speed is 0, and the battery voltage is equal to or higher than the predetermined value VBS, the engine stop mode is established, so the engine is stopped. As conditions for the engine stop mode, further, the temperature of the cooling water of the engine is equal to or higher than a predetermined value TS, the tilt angle of the vehicle body in the stopped state is equal to or lower than the predetermined value θ, and switches of auxiliary equipment such as an air conditioner are turned off. The condition of may be added.

If the engine stop mode is not established at (T7), the idling mode is continued to keep the engine rotating. In the meantime, if the engine stop mode is established due to an increase in engine coolant temperature (T8), the engine is stopped.

After the engine is stopped, if the key switch remains on and the accelerator switch is turned on again (T
9) Start the engine in the start mode 2 (T1
0), acceleration operation according to the accelerator opening is performed (T12).

When the key switch is turned off (T13), the engine stop mode is established, so the engine is stopped.

As described above, by appropriately controlling the relationship between the operating states of the respective drive sources on the basis of the charging rate of the battery and the operating conditions during traveling, the fuel consumption and operating characteristics of the entire hybrid vehicle drive system can be improved. While improving, it is possible to reduce the emission amount of harmful exhaust gas components.

In the above example of FIG. 7, when (T6) is the deceleration in front of the traffic light and (T7) to (T9) are in the signal waiting state, the engine is operated during the period (T8) to (T9). It is possible to stop idling and suppress the emission of harmful exhaust gas. Also, during the period from (T7) to (T8), consideration is given to maintaining the battery voltage and engine coolant temperature.
At (T9), the engine can be restarted smoothly even after idling has been stopped.

Next, the auxiliary battery controller 14
Is a duty calculation unit 141, as shown in FIG.
And a PWM control unit 142. The duty calculation unit 141 determines the charging rate (voltage VBM) of the main battery 5.
The duty α is calculated from the command VBs * and the voltage VBs of the auxiliary battery, which have a predetermined relationship with respect to. As shown in FIG. 9, the larger the voltage VBM, the smaller the duty α. The PWM control unit 142 generates a PWM signal corresponding to the duty α and switches the switching element 8
Control chopper.

[0064]

As described above, according to the present invention, it is possible to reduce the fuel consumption of a hybrid vehicle and improve driving characteristics such as acceleration. Especially, even if the key switch is on, if the accelerator is turned off, the engine idling will be stopped under a predetermined condition.Therefore, as a measure against exhaust gas, the engine idling will be stopped when the vehicle is temporarily stopped to reduce the emission of harmful exhaust gas. In addition, the driving operation at the time of the temporary stop can be simplified, and the restart after the stop and the acceleration operation can be smoothly performed.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of a hybrid vehicle drive device according to a first embodiment of the present invention.

FIG. 2 is a diagram showing a detailed configuration example of a controller shown in FIG.

FIG. 3 is a diagram showing a detailed configuration example of the motor / generator controller of FIG.

FIG. 4 is a diagram showing a configuration example of the engine controller of FIG. 2 and an engine controlled by the engine controller.

FIG. 5 is a diagram showing an example of a driving mode of the hybrid vehicle drive system of the present invention.

FIG. 6 is a diagram showing an outline of an operation flow of the controller of FIG. 1.

FIG. 7 is a diagram showing an example of the relationship between the driving condition during traveling and the operating state of each drive source by the hybrid vehicle drive device of FIG. 1.

8 is a diagram showing a configuration example of the auxiliary battery controller of FIG.

FIG. 9 is a diagram showing the relationship between the duty α, the voltage VBM of the main battery, and the voltage VBs of the auxiliary battery.

[Explanation of symbols]

1 ... Controller, 2 ... Engine, 3 ... Motor / generator, 4 ... Inverter, 5 ... Main battery, 6
... auxiliary battery, 8 ... switching element, 11 ... integrated control unit 11, 12 ... motor / generator controller, 13 ... engine controller, 14 ... auxiliary battery controller

─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. ⁷ Identification code FI B60K 6/04 400 B60K 6/04 400 531 531 730 730 F01L 9/04 F01L 9/04 A F02D 17/00 F02D 17/00 Q 29/02 29/02 D 321 321A 29/06 29/06 L (56) Reference JP-A-10-89115 (JP, A) JP-A-9-39613 (JP, A) JP-A-9-209790 ( (58) Fields surveyed (Int.Cl. ⁷ , DB name) B60K 6/04 B60L 11/00-11/18 F02D 29/00-29/06 F02D 41/00-41/40

Claims (6)

(57) [Claims] 1. An engine, a motor / generator connected to the engine, a main battery connected to the motor / generator via a power converter, an auxiliary battery connected to the main battery, An auxiliary device that is driven by electric power supplied from an auxiliary battery and a controller that controls the engine and the motor / generator are provided, and the controller is responsive to a driving state of a vehicle and a charging rate of the main battery. It has a plurality of operation modes for controlling the engine and the motor / generator, and when two predetermined values relating to the charging rate of the main battery are VBMH and VBML (where VBMH> VBML), the main The battery charge rate is lower than one of the two predetermined values (VBMH) and the engine is When the accelerator opening to be created is smaller than the predetermined value TA and the charging rate of the main battery is the two other predetermined value (VBM
L) and the accelerator opening is equal to the predetermined value TA
Is larger than the above, the engine is operated as a drive source for the vehicle and the motor / generator, and the engine running power generation mode in which the electric power generated by the motor / generator is collected in the main battery is set, and the charging rate of the main battery is set. Is higher than the other of the two predetermined values (VBML) and the opening degree of the accelerator is larger than the predetermined value TA, the acceleration mode is performed in which the engine and the motor / generator are driven as a drive source of the vehicle, When the charging rate of the main battery is higher than one of the two predetermined values (VBMH) and the opening degree of the accelerator is smaller than the predetermined value TA, engine running in which only the engine is operated as a drive source of the vehicle Mode, the key switch is on, the accelerator is off, and the vehicle speed is below a specified value. When the charging rate of the main battery is equal to or higher than the other of the two predetermined values (VBML), and the cooling water temperature of the engine is equal to or higher than a predetermined value or the tilt angle of the stopped vehicle is equal to or lower than the predetermined value, the engine is stopped. A hybrid vehicle drive characterized in that an engine stop mode is set to be set, and a starting mode is set in which the engine is started by the motor / generator when the key switch is kept ON and the accelerator is set to ON after the engine is stopped. apparatus. 2. The hybrid vehicle drive system according to claim 1, wherein the controller continues the idling operation of the engine when the accelerator is off and the engine stop mode is not established, and then the engine. A hybrid vehicle drive device characterized in that the engine is stopped when a stop mode is established. 3. The hybrid vehicle drive device according to claim 1, wherein the controller is configured to:
A torque command according to the opening degree of the accelerator is output to the motor /
A hybrid vehicle drive device characterized by being applied to a generator. 4. The hybrid vehicle drive device according to claim 1, wherein the controller is configured such that the key switch is on, the accelerator is off, the vehicle speed is greater than 0, and the battery charge rate is a predetermined value. A hybrid vehicle drive device characterized by using the motor / generator as a power generator when not reaching the limit, and setting a regenerative mode for charging the battery. 5. The hybrid vehicle drive system according to claim 4, wherein the controller increases the torque command to the motor / generator to increase the braking force when the brake switch is on. Hybrid vehicle drive system. 6. An engine, a motor / generator connected to the engine, a main battery connected to the motor / generator via a power converter, an auxiliary battery connected to the main battery, Driving a hybrid vehicle including auxiliary equipment that is driven by electric power supplied from an auxiliary battery and a controller that controls the engine and the motor / generator according to the operating state of the vehicle and the charging rate of the main battery In doing so, when the two predetermined values relating to the charging rate of the main battery are VBMH and VBML (where VBMH> VBML), the charging rate of the main battery is lower than one of the two predetermined values (VBMH) and When the opening degree of the accelerator for operating the engine is smaller than a predetermined value TA, and the main battery The other charging rate the two predetermined values (VBM
L) and the opening degree of the accelerator for operating the engine is larger than the predetermined value TA, the engine is operated as a drive power source for the vehicle and the motor / generator, and the motor is operated. / When the electric power generated by the generator is collected in the main battery, the charging rate of the main battery is higher than the other of the two predetermined values (VBML), and the opening degree of the accelerator is larger than the predetermined value TA. Is an acceleration mode in which the engine and the motor / generator are driven as a drive source for a vehicle, the charging rate of the main battery is higher than one of the two predetermined values (VBMH), and the opening degree of the accelerator is When the value is smaller than the predetermined value TA, the engine running mode is set and only the engine is operated as the drive source of the vehicle. -The switch is on, the accelerator is off, the vehicle speed is less than or equal to a predetermined value, the charge rate of the main battery is at least the other of the two predetermined values (VBML), and the engine cooling water temperature is at a predetermined value. When the inclination angle of the vehicle is equal to or more than the value or is equal to or less than a predetermined value, the engine is stopped, the engine is stopped, and after the engine is stopped, the key switch is kept on and the accelerator is started. A method for driving a hybrid vehicle, wherein the engine is started by the motor / generator as a mode.