JP2000050412A - Hybrid automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To possibly suppress deterioration in fuel consumption by quickening the start timing of an engine for the charged amount of a battery when detecting a low-speed running and an air-conditioning turned on. SOLUTION: After the control of a drive system is started, it is judged whether an air-conditioning device 41 that consumes a large current is on or not. According to the judgment, when it is judged that the air-conditioning device 41 is on, it is judged whether a current vehicle is set to a congestion-road running state due to low-speed running or not. When it is judged that the vehicle is set to the congestion-road running state according to the judgment, the start timing of an engine 1 for a charged amount is corrected to an early ignition mode, and also the stop timing of the engine is corrected to a delay mode. Furthermore, to suppress the decrease of the charged amount of a battery 5, the supply current of a motor 3 at the side of the engine when starting the engine 1 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hybrid vehicle provided with an engine and a motor supplied from a battery as driving power sources.

[0002]

2. Description of the Related Art A hybrid vehicle has a basic configuration in which it travels using an engine and a motor supplied from a battery in combination (for example, see Japanese Patent Application Laid-Open No. 9-28).
No. 4914), which was developed against the background of two recent global propositions of environmental protection and effective use of resources. Therefore, the engine is required to have a structure capable of performing high-efficiency operation with good fuel efficiency in the middle load region where the operation frequency is the highest, and the engine is required to operate at low speed /
In the low load range, the operation is stopped in principle. Therefore, for example, in a low-speed / low-load operation region including low-speed traveling such as traveling on a congested road, traveling by a motor is performed instead of the engine.

[0003] The battery supplies power to the motor to drive the vehicle by the driving force of the motor, and supplies power to the generator at the time of starting the engine so that the generator functions as a motor to start the engine. Therefore, in order to obtain a predetermined terminal voltage, it is necessary that the charged amount is maintained at a predetermined value or more. Therefore, the above-mentioned battery has a storage amount (remaining amount).
Is appropriately stored according to the following.Specifically,
The power storage in the battery is performed by power storage by driving the generator by the engine to generate power, and power storage by the regenerative action of the motor when the vehicle decelerates.

[0004] The starting of the engine is executed based on a basic control map (see FIG. 4) set according to a predicted operating state, and the opening of the throttle valve (ie, the opening of the throttle valve linked to the operation of the accelerator pedal (ie, the opening degree of the throttle valve). , The engine load) is equal to or more than a predetermined value and the opening degree change rate is equal to or more than a predetermined value.

[0005]

According to such a driving mode specific to a hybrid vehicle, in a low-speed running state such as running on a congested road, the running is performed only by the motor instead of the engine. It has been conventionally pointed out that the above-described problem occurs.

That is, in a low-speed running state in which running at a low speed is continued for a long time, such as running on a congested road, cooling of the engine room by running wind cannot be expected. For this reason, when the temperature of the generator arranged in the engine room is increased, the capacity is reduced, and the output driving force is reduced as compared with that at normal temperature.

In an air conditioner disposed in an engine room, the temperature inside the vehicle increases as the ambient temperature in the engine room increases, and the cooling load in the vehicle increases. Will continue high-load operation. The continuation of the high-load operation of the compressor driving motor causes an increase in the temperature of the motor, thereby reducing the output driving force. At the same time, the increase in the temperature of the motor reduces the ambient temperature of the engine room. A vicious cycle in which the ascent is promoted and the driving load of the compressor driving motor further increases due to the further increase in the cooling load in the vehicle, and as a result, the power consumption of the battery increases due to the increase in the power consumption of the compressor driving motor. Rapidly decreases and the amount of stored power becomes insufficient, and the terminal voltage decreases. Further, the temperature of the battery gradually increases due to the continuation of discharge to the compressor driving motor, so that the terminal voltage with respect to the charged amount decreases. Due to the decrease in the terminal voltage due to the shortage of the charged amount of the battery, the current supplied from the battery to the generator decreases.

As described above, when the vehicle is running at a low speed and the air conditioner is operating, the capacity of the generator itself is reduced, and in addition to the decrease in the terminal voltage of the battery, the current supplied to the generator is reduced. Is reduced, the generator cannot provide the driving force for starting the engine. For example, when the generator is started by the generator in response to a power storage request or a request for increasing the driving force, the starting is not performed. It can be difficult.

As one means for ensuring the engine startability by such a generator, it is necessary to operate the engine at a high output, drive the generator by its driving force to generate power, and increase the amount of charge stored in the battery. It is conceivable, however, that the power generation by the high-power operation of the engine greatly deteriorates the fuel efficiency. Therefore, it is not preferable in view of the ultimate purpose of the hybrid vehicle of low fuel efficiency.

[0010] In view of the above-mentioned problems, the invention of the present application is designed to prevent engine starting failure in a hybrid vehicle under a situation where the amount of stored electricity in the battery is insufficient, while minimizing deterioration of fuel efficiency. It is intended to be able to be realized.

[0011]

Means for Solving the Problems In the present invention, the following configuration is adopted as specific means for solving such problems.

In the first aspect of the present invention, an engine and a motor supplied from a battery are provided as drive sources, and the engine is stopped in a traveling region where the traveling load is low, and the vehicle is driven by only the motor. In the hybrid vehicle, low-speed running state detecting means for detecting a low-speed running state in which the running period of the motor is excessive, and air-conditioning operation detecting means for detecting operation of a vehicle air conditioner that drives a compressor by the motor. When the low-speed running state and the air-conditioning operation state are detected based on signals from the low-speed running state detecting means and the air-conditioning operation detecting means, the engine start timing with respect to the charged amount of the battery is advanced. And

In the second invention of the present application, an engine and a motor supplied from a battery are provided as drive sources, and the engine is stopped in a traveling region where the traveling load is low, and traveling is driven only by the motor. In the hybrid vehicle, low-speed running state detecting means for detecting a low-speed running state in which the running period of the motor is excessive, and air-conditioning operation detecting means for detecting operation of a vehicle air conditioner that drives a compressor by the motor. When the low-speed running state and the air-conditioning operation state are detected based on signals from the low-speed running state detection means and the air-conditioning operation detection means, the engine stop timing with respect to the charged amount of the engine is delayed. Features.

In the third invention of the present application, an engine and a motor supplied from a battery are provided as a drive source, and the engine is stopped in a traveling region where the traveling load is low, and the traveling is driven only by the motor. In the hybrid vehicle, a low-speed running state detecting unit that detects a low-speed running state in which the running period of the motor is excessive, an air-conditioning operation detecting unit that detects an operation of a vehicle air conditioner that drives a compressor by the motor, An engine drive detecting means for detecting driving of the engine, wherein it is detected that the vehicle is in the low-speed running state and the air-conditioning operation state based on signals from the low-speed running state detecting means and the air-conditioning operation detecting means, When the driving of the engine is detected by a signal from the engine driving detecting means, the engine is stopped. The emissions by highly efficient operation in conjunction with causing the power storage to the battery by the power generation of driving the vehicle running and the generator by the driving force of the engine,
It is characterized in that vehicle running by the motor is regulated.

According to a fourth aspect of the present invention, in the hybrid vehicle according to the third aspect, the vehicle travels by the driving force of the engine and the power storage by driving the generator is performed, and the vehicle travel by the motor is restricted. In this state, the generator current is directly supplied to the compressor of the vehicle air conditioner without passing through the battery.

In the fifth invention of the present application, an engine and a motor supplied from a battery are provided as a drive source, and the engine is stopped in a traveling region where the traveling load is low, and the traveling is driven only by the motor. In the hybrid vehicle, low-speed running state detecting means for detecting a low-speed running state in which the running period of the motor is excessive, and air-conditioning operation detecting means for detecting operation of a vehicle air conditioner that drives a compressor by the motor. And reducing the supply current to a generator for starting the engine when it is detected that the vehicle is in the low-speed traveling state and the air-conditioning operation state based on signals from the low-speed traveling state detection means and the air-conditioning operation detection means. It is characterized by.

[0017]

According to the present invention, the following effects can be obtained by adopting such a configuration.

(A) According to the hybrid vehicle of the first aspect of the present invention, low-speed running state detecting means for detecting a low-speed running state in which the running period by the motor is excessive, and the compressor is driven by the motor. Air-conditioning operation detecting means for detecting the operation of the vehicle air-conditioning system, when the low-speed running state and the air-conditioning operation state are detected, that is, when the storage operation of the battery decreases and excessive current consumption occurs. In a situation where the amount of charge in the battery is insufficient and the driving power of the generator may be insufficient, the engine start timing with respect to the amount of charge (remaining amount) of the battery is advanced as compared with the case other than the above-described state.

As a result, for example, when the engine stop timing with respect to the charged amount of the battery is constant, the entire charge period is extended by the advanced start timing, and the sufficient charged amount in the battery is not increased. Will be secured. Therefore, for example, when it is necessary to start the engine and increase the vehicle driving force, such as when shifting from congested road traveling to accelerated traveling,
The engine can be reliably started by supplying an appropriate current from the battery to the generator, and the reliability in terms of startability is enhanced.

(B) According to the hybrid vehicle of the second aspect of the present invention, the low-speed running state detecting means for detecting a low-speed running state in which the running period by the motor is excessive, and the compressor is driven by the motor. Air-conditioning operation detecting means for detecting the operation of the vehicle air-conditioning system, when the low-speed running state and the air-conditioning operation state are detected, that is, when the storage operation of the battery decreases and excessive current consumption occurs. In a situation where the amount of charge in the battery is insufficient and the driving power of the generator may be insufficient, the engine stop timing with respect to the amount of charge (remaining amount) of the battery is delayed more than in other states.

As a result, for example, when the engine start timing with respect to the charged amount of the battery is constant, the overall charge period is extended by the delay of the stop timing, and the battery has a sufficient charged amount. Will be. Therefore, when it is necessary to start the engine and increase the vehicle driving force, for example, when shifting from congested road driving to acceleration driving, the engine is supplied by an appropriate current supply from the battery to the generator. The starting can be surely performed, and the reliability in terms of the starting property is enhanced.

(C) According to the hybrid vehicle of the third aspect of the present invention, in a low-speed running state in which the running period by the motor is excessive, and in a state in which the vehicle air conditioner that drives the compressor by the motor is operated. That is, when the driving of the engine is detected in a situation in which the amount of stored power in the battery is insufficient due to a decrease in the power storage function of the battery and excessive current consumption, and the driving power of the generator may be insufficient, By driving the engine with high efficiency to drive the vehicle with its driving force and restricting the vehicle from running by the motor, a decrease in the charged amount of the battery is suppressed. The surplus power is allocated to the power generation by the generator, and the increase in the storage capacity of the battery It is planned.

By suppressing the decrease in the charged amount of the battery and by executing the charging of the battery, the battery can be maintained in a low-speed running state in which it is difficult to maintain the charged amount of the battery and in an air-conditioning operation state. Is always properly maintained. Therefore, for example, in a case where after driving of the engine for power storage is stopped, the vehicle shifts from congested road running to accelerated running and the engine is started to increase the vehicle driving force, the battery is supplied to the generator properly. Current is supplied, and the engine can be started reliably.

(D) According to the hybrid vehicle of the fourth aspect of the present invention, the following specific effects can be obtained in addition to the effects described in the above (c). That is, in the hybrid vehicle according to the present invention, when the vehicle is driven by the engine driving power and the power is driven by driving the generator, and the vehicle is prevented from being driven by the motor, the generated current of the generator is supplied to the battery. Since the current is directly supplied to the compressor of the vehicle air conditioner without any intervention, the current supplied to the compressor is not affected by the voltage drop in the battery. As a result, it is possible to maintain the fuel efficiency by effectively utilizing the generated current, and by extension, by effectively utilizing the engine driving force.

(E) According to the hybrid vehicle of the fifth aspect of the present invention, the low-speed running state detecting means for detecting a low-speed running state in which the running period by the motor becomes excessive, and the compressor is driven by the motor. Air-conditioning operation detecting means for detecting the operation of the vehicle air-conditioning system, when the low-speed running state and the air-conditioning operation state are detected, that is, when the storage operation of the battery decreases and excessive current consumption occurs. In a situation where there is a possibility that the driving power of the generator may be insufficient due to the shortage of the charged amount of the battery, the supply current to the generator that starts the engine is reduced.

As a result, the decrease in the amount of charge in the battery is suppressed by the amount by which the supply current to the generator is reduced, and the start of the engine is performed somewhat slowly due to the decrease in the supply current to the generator. However, since the running state is originally a low-speed running state in which responsiveness of driving force increase is not so required, no problem occurs in terms of engine startability. That is, according to the hybrid vehicle of the present invention, it is possible to maintain both the amount of charge of the battery and the startability of the engine, even in a situation where the amount of charge in the battery is insufficient.

[0027]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a hybrid vehicle according to the present invention will be specifically described based on preferred embodiments.

FIG. 1 shows a drive system of a hybrid vehicle according to the present invention.
Reference numeral 1 denotes an engine, 2 denotes an automatic transmission unit, 3 denotes an engine side motor connected to the engine 1 via a transmission mechanism 13, 4 denotes a drive side motor, 5 denotes a battery, 6 denotes a current control controller, and 7 denotes a converter. , 8 are system controllers. The automatic transmission unit 2 includes a torque converter 21, a clutch 23, an automatic transmission 22, and a gear train 24. The gear train 24 of the automatic transmission unit 2 includes an axle 1
The front wheels 15, 15 serving as drive wheels are connected via the motor 4, and the drive motor 4 is connected via a motor output shaft 12. The engine 1 includes, for example, a variable valve mechanism, and is configured to perform fuel-efficient high-efficiency operation in a rotation speed range around 2000 to 3000 rpm. The engine-side motor 3 is driven by a current from the battery 5 to perform cranking of the engine 1, and in a specific running state (to be described later), the driving force of the engine 3 is transmitted through the transmission mechanism 13. While transmitting the driving power to the engine 1 side, the power is generated by being driven by the engine 1 and the battery 5 is stored. The driving motor 4 is driven by a current supplied from the battery 5.

Reference numeral 31 denotes a brake pedal. The displacement of the brake pedal 31 is input to the brake controller 33 as a brake signal, and the braking control of the front wheel 15 is performed by a control signal from the brake controller 33. Reference numeral 32 denotes an accelerator pedal. The displacement of the accelerator pedal 32 is input to an accelerator controller 34 as an accelerator signal, and the operation of the engine 1 is controlled by a control signal from the accelerator controller 34.

Reference numeral 41 denotes a heat pump type air conditioner which cools the drive motor 4 disposed in the engine room together with air conditioning in the vehicle. The heat pump air conditioner includes a motor (not shown) and a compressor driven by the motor. Have. Reference numeral 42 denotes a vehicle system for controlling electric equipment on the vehicle side, 43 denotes a power steering motor, 44
Is an oil pump for power steering, and 45 is an oil pump for power train.

The hybrid vehicle includes the engine 1 and the drive motor 4 as a main drive source as described above, and includes the engine motor 3 functioning as a generator as a sub drive source. By selecting and using each drive source according to the running state of the vehicle, fuel-efficient driving is realized. In FIG. 1, the current supply path is indicated by black arrows.

Here, the basic control (map control) of the hybrid vehicle will be described with reference to FIGS.

FIG. 4 shows the driving system, that is, the operating state of the engine 1, the engine-side motor 3, the drive-side motor 4, and the battery 5 for each running state of the vehicle.
Here, as the traveling state, six states are set: "when stopped", "when starting", "when starting the engine", "when steady driving", "when suddenly accelerating", and "when decelerating". The “at the start” is further divided into “slow start” and “rapid start”. Further, regarding the above “at steady driving”, the “low load”, “medium load” and “high load”
And divided into The operating state of the drive system in each of these running states is as follows.

A: When stopped (state shown in FIG. 3)
The working engine 1 is stopped in principle. However, even when the vehicle is stopped, the operation is exceptionally performed when the engine needs to be warmed up and the battery needs to be charged, and when the battery capacity decreases (that is, when the charged amount of the battery 5 decreases). You.

The engine side motor 3 is stopped in principle. However, even when the vehicle is stopped, when the engine 1 is operating, the engine 1 is driven to generate power.

The driving motor 4 is stopped without exception.

When the engine-side motor 3 is generating power, the battery 5 receives the generated current from the engine-side motor 3 and stores the power.

The necessity of the storage of the battery 5 is determined by comparing the storage amount with a preset start reference storage amount and a stop reference storage amount. For example, when the storage amount is reduced to the start reference storage amount. , A power storage request is issued to start power storage (engine 1 is started), and when the power storage amount reaches the stop reference power storage amount as the power storage progresses, a power storage stop request is issued at that time to stop power storage (engine 1). Is the basic control. However, in this embodiment, as described later, in a specific traveling state, power storage is started at a point in time when the power storage amount is larger than the start reference power storage amount (see step S3 in FIG. 2), or the stop reference power storage is performed. By stopping the power storage at a point in time when the storage amount is larger than the amount (see step S4 in FIG. 2), the storage period is extended to secure the required storage amount.

B: Operation at Start B-1: Operation at Slow Start (the state shown in FIG. 3) The engine 1 is stopped.

The engine side motor 3 is stopped when the engine 1 is stopped.

The driving motor 4 is driven by a current supplied from the battery 5, and is brought into a "power running" state in which the vehicle runs by its driving force.

The battery 5 discharges the driving motor 4 to drive the driving motor 4.

Therefore, when the vehicle starts slowly, the vehicle travels (starts) only by the driving force of the driving motor 4.

B-2: At the time of sudden start (state shown in FIG. 3)
After the start, the operating engine 1 is operated at a high output.

The engine side motor 3 is driven by a current supplied from the battery 5, and is brought into a "power running" state in which the vehicle runs by the driving force.

The driving motor 4 is driven by a current supplied from the battery 5, and is brought into a "power running" state in which the vehicle runs by its driving force.

The battery 5 discharges the engine-side motor 3 and the drive-side motor 4 to drive the engine-side motor 3 and the drive-side motor 4 together.

Therefore, when the vehicle is suddenly started, the vehicle is driven (started) by the cooperation of the three driving forces of the engine 1, the engine side motor 3 and the drive side motor 4.

C: When the engine is started (the state shown in FIG. 3)
In the state ( 1 ), the operating engine 1 is started by receiving a driving force from the engine side motor 3.

The engine-side motor 3 is driven by a current supplied from the battery 5 and is brought into a "power running" state in which the engine 1 is started by the driving force.

The driving motor 4 is stopped.

The battery 5 discharges the engine-side motor 3 to drive the engine-side motor 3.

The engine 1 is started by the driving force of the engine-side motor 3, and the driving force generated by the engine-side motor 3 depends on the current value supplied from the battery 5. However, in this embodiment, as described later, the supply current to the engine-side motor 3 is deliberately reduced in a specific running state (see step S7 in FIG. 2) to reduce the amount of power stored in the battery 5. We try to suppress the decrease.

D: Operation during steady running D-1: Operation in a low-load region (the state shown in FIG. 3) The engine 1 is stopped in principle. However, even when the load is low, the operation is exceptionally performed when the engine needs to be warmed up and the engine needs to be charged, and when the battery capacity has decreased.

The engine side motor 3 is stopped in principle. However, even when the load is low, when the engine 1 is operating, the engine 1 is driven to generate power.

The driving motor 4 is driven by a current supplied from the battery 5, and is brought into a "power running" state in which the vehicle runs by its driving force.

The battery 5 discharges the drive side motor 4 to drive the drive side motor 4 and, when the engine side motor 3 is generating power, receives the generated current of the engine side motor 3 to store the power. I do.

Therefore, in a steady running under a low load, the vehicle runs only by the driving force of the driving motor 4.

D-2: Medium load area (the state shown in FIG. 3)
In the state ( 1 ), the operating engine 1 performs high-efficiency driving and drives the vehicle by the driving force.

The engine-side motor 3 is driven by the engine 1 to generate electric power.

The driving side motor 4 is brought into a non-output state in which the driving side motor idles by receiving a driving force from the front wheel 15 side.

The battery 5 receives the electric current generated by the engine side motor 3 and is stored.

Therefore, in the steady running with the medium load, the running of the vehicle is performed only by the driving force of the engine 1.

D-3: High load area (illustration in FIG. 3 is omitted)
The operating engine 1 performs a high-output operation and drives the vehicle by its driving force.

The engine-side motor 3 generates electric power in response to the driving force of the engine 1 when there is enough driving power. In other cases, the engine-side motor 3 is driven by receiving the current from the battery 5 to drive the vehicle. The power running state is set.

The drive side motor 4 is driven by a current supplied from the battery 5, and is brought into a "power running" state in which the vehicle runs by its driving force.

The battery 5 discharges the engine-side motor 3 and the drive-side motor 4 to drive them.

Therefore, in the steady running under a high load, the vehicle is driven by the driving force obtained by adding the driving force of the engine 1 and the driving motor 4 and the driving force when the engine motor 3 is in the power running state. Is performed.

E: During rapid acceleration (not shown in FIG. 3)
The operating engine 1 performs a high output operation and drives the vehicle by its driving force.

The engine-side motor 3 is driven by receiving a current from the battery 5 and brought into a power running state for running the vehicle.

The driving motor 4 is driven by a current supplied from the battery 5, and is brought into a "power running" state in which the vehicle runs by its driving force.

The battery 5 discharges the engine-side motor 3 and the drive-side motor 4 to drive them.

Therefore, at the time of rapid acceleration, the vehicle is driven by the driving force of the engine 1, the engine-side motor 3, and the drive-side motor 4.

F: At the time of deceleration (the state shown in FIG. 3)
The working engine 1 is stopped.

The engine side motor 3 is stopped.

The drive side motor 4 is brought into a regenerative state in which the drive side motor 4 receives a driving force from the front wheels 15 and is driven to generate power.

The battery 5 receives the regenerative current from the drive motor 4 and stores power.

As described above, according to the running state of the vehicle,
By selectively operating the engine 1, the engine-side motor 3, and the drive-side motor 4, which are drive sources, the original purpose of the hybrid vehicle, that is, fuel-efficient driving is achieved.

According to the driving mode specific to the hybrid vehicle having such a control mode, in a low-speed running state such as running on a congested road, the running is performed only by the motor instead of the engine, and furthermore, each of the running winds is used. The motors 3 and 4 and the battery 5 are not cooled, and instead the air conditioner 4 has a compressor with a large current consumption.
As described above, since the cooling is performed by the fuel cell 1, there is a possibility that the charged amount of the battery 5 becomes insufficient and the startability of the engine 1 is impaired.

Therefore, in the hybrid vehicle of this embodiment, the present invention is applied to achieve good engine startability in a low-speed running state while minimizing deterioration of fuel efficiency.

Hereinafter, control of the drive system of the hybrid vehicle for achieving the above object will be specifically described with reference to the flowchart shown in FIG.

In the flowchart of FIG. 2, after the start of the control, first, in step S1, it is determined whether or not the air conditioner 41 consuming a large amount of current is operated. Here, the air conditioner 4
If it is determined that the battery 1 is not operating, it is determined that the shortage of the charged amount of the battery 5 does not occur,
Normal map control (basic control in FIG. 4) is executed (step S8).

On the other hand, if it is determined that the air conditioner 41 is operating, it is further determined in step S2 whether or not the vehicle is currently traveling on a congested road. If it is determined that the vehicle is not traveling on a congested road, it is determined that the shortage of the charged amount of the battery 5 does not occur even if the air conditioner 41 is operating, and the normal map control is executed. (Step S8).

On the other hand, if it is determined that the vehicle is traveling on a congested road, in step S3 the engine 1 is started with respect to the charged amount in order to extend the charge period of the battery 5 and increase the charged amount. The timing is corrected to the early side, and in step S4, the stop timing of the engine 1 with respect to the charged amount is corrected to the lag side, and further, in step S5, the engine is controlled to suppress a decrease in the charged amount of the battery 5. The current supplied to the engine-side motor 3 (that is, the generator) at the time of the start of Step 1 is reduced.

Thereafter, in step S6, it is determined whether or not there is a request for starting the engine 1. Here, if it is determined that there is no start request, it is determined that the shortage of the charged amount of the battery 5 can be avoided by taking the measures in steps S3 to S5, and the control is returned as it is.

On the other hand, if it is determined that a request to start the engine 1 has been issued due to insufficient vehicle driving force, the required vehicle driving force is ensured while maintaining good fuel economy performance and the battery The control in step S7 is executed in order to eliminate the shortage of the charged amount of No. 5. That is, first, the engine 1
With the start of the operation, the drive side motor 4 is stopped to suppress a decrease in the charged amount of the battery 5. In addition, the engine 1 is operated with high efficiency, the vehicle is driven by the driving force, and the driving force of the engine 1 has a surplus since the vehicle is traveling on a congested road. Therefore, the engine-side motor 3 is driven by the surplus. Then, the generated current is stored in the battery 5 to increase the stored amount. Further, in order to maintain good fuel efficiency by operating the air conditioner 41 by using the generated current of the engine-side motor 3 more effectively, the generated current of the engine-side motor 3 is transmitted through the battery 5. The battery is directly supplied to the compressor of the air conditioner 41 without the influence of the voltage drop due to the battery 5.

Since the above control is continuously executed in the low-speed running state, the shortage of the charged amount of the battery 5 is prevented beforehand, and the startability of the engine 1 is favorably maintained. .

[Brief description of the drawings]

FIG. 1 is a drive system diagram of a hybrid vehicle according to the present invention.

FIG. 2 is a control flowchart of the hybrid vehicle shown in FIG.

FIG. 3 is a vehicle speed map of the hybrid vehicle shown in FIG. 1;

FIG. 4 is a basic control characteristic diagram of the hybrid vehicle shown in FIG.

[Explanation of symbols]

1 is an engine, 2 is an automatic transmission unit, 3 is an engine side motor (generator), 4 is a drive side motor, 5 is a battery, 6 is a current control controller, 7 is a converter, 8 is a system controller, and 11 is an engine output shaft. , 12 is a motor output shaft, 13 is a transmission mechanism, 14 is an axle, 15 is a front wheel, 21 is a torque converter, 22 is an automatic transmission, 23 is a clutch, 24 is a gear train, 31 is a brake pedal, 32 is an accelerator pedal, 33 is a brake controller, 34 is an accelerator controller, 41 is an air conditioner, 42 is a vehicle system, 43 is a power steering motor, 44 is a power steering oil pump, and 45 is a power train oil pump.

Continued on the front page (72) Inventor Masahiro Tsuchiya 3-1 Shinchi, Fuchu-cho, Aki-gun, Hiroshima Mazda F-term (reference) 3G093 AA05 AA07 AA12 AA16 BA00 CB02 DB05 DB25 EB00 EB09 EC02 FA10 FB04 5H111 BB06 CC01 CC02 CC16 DD01 DD08 DD12 EE01 GG17 HB10 5H115 BB04 BC07 CA01 CA32 EE03

Claims (5)

[Claims] 1. A hybrid vehicle in which an engine and a motor supplied from a battery are provided side by side as a drive source, and the engine is stopped in a traveling region where the traveling load is low, and the vehicle is driven by only the motor. A low-speed running state detecting unit that detects a low-speed running state in which a running period by the motor becomes excessive; and an air-conditioning operation detecting unit that detects operation of a vehicle air conditioner that drives a compressor by the motor. A hybrid, wherein when the low-speed running state and the air-conditioning operation state are detected based on signals from the running state detection means and the air-conditioning operation detection means, the engine start timing with respect to the charged amount of the battery is advanced. Car. 2. A hybrid vehicle in which an engine and a motor supplied from a battery are provided as driving sources, and the engine is stopped in a traveling region where a traveling load is low, and the vehicle is driven by only the motor. A low-speed running state detecting unit that detects a low-speed running state in which a running period by the motor becomes excessive; and an air-conditioning operation detecting unit that detects operation of a vehicle air conditioner that drives a compressor by the motor. A hybrid characterized in that when it is detected that the vehicle is in the low-speed traveling state and in the air-conditioning operation state based on signals from the traveling state detection means and the air-conditioning operation detection means, the stop timing of the engine with respect to the charged amount of the battery is delayed. Car. 3. A hybrid vehicle in which an engine and a motor supplied from a battery are provided as driving sources, and the engine is stopped in a traveling region where a traveling load is low, and the vehicle is driven and driven only by the motor. Low-speed running state detecting means for detecting a low-speed running state in which a running period by the motor becomes excessive, air-conditioning operation detecting means for detecting operation of a vehicle air conditioner driving a compressor by the motor, and driving of the engine An engine drive detecting means for detecting that the vehicle is in the low-speed running state and the air-conditioning operation state based on signals from the low-speed running state detecting means and the air-conditioning operation detecting means; When the driving of the engine is detected by a signal from the Hybrid vehicle, characterized in that together with causing the power storage to the battery by the power generation of driving the vehicle running and the generator by the driving force of the engine, to regulate the vehicle running by the motor Te. 4. The vehicle according to claim 3, wherein when the vehicle is driven by an engine driving power and the generator is driven to store power, and the vehicle is restricted from being driven by the motor, the generated current of the generator is supplied to the battery. A hybrid vehicle, wherein the vehicle is directly supplied to a compressor of the air conditioner for a vehicle without passing through a vehicle. 5. A hybrid vehicle in which an engine and a motor supplied from a battery are provided as drive sources, and the engine is stopped in a traveling region where the traveling load is low, and the vehicle is driven by the motor alone. A low-speed running state detecting unit that detects a low-speed running state in which a running period by the motor becomes excessive; and an air-conditioning operation detecting unit that detects operation of a vehicle air conditioner that drives a compressor by the motor. When it is detected that the vehicle is in the low-speed traveling state and is in the air-conditioning operation state based on signals from the traveling state detection means and the air-conditioning operation detection means, the supply current to the generator for starting the engine is reduced. Hybrid car.