JP3721443B2 - Hybrid car - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hybrid vehicle in which an engine and a motor supplied with power from a battery are provided as a traveling drive source.
[0002]
[Prior art]
A hybrid vehicle is basically configured to travel using both an engine and a motor fed by a battery (see, for example, Japanese Patent Laid-Open No. 9-284914), and is called environmental protection and effective use of resources. It was developed against the background of two major global propositions in recent years. Therefore, the engine is required to have a structure capable of high-efficiency driving with good fuel efficiency in the middle load range where the driving frequency is the highest. In principle, the engine can be operated in the low speed / low load range where fuel efficiency decreases. Stopped. 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]
In addition, the battery feeds the motor to drive the vehicle by the driving force of the motor, and at the time of starting the engine, feeds the generator to cause the generator to function as a motor and start the engine. 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 battery appropriately stores electricity according to the amount of electricity stored (remaining amount). Specifically, the electricity stored in the battery is generated by driving the generator with the engine. Power storage and power storage by the regenerative action of the motor when the vehicle is decelerating.
[0004]
The engine is started based on a basic control map (see FIG. 4) set in accordance with a predicted operating state, and the throttle valve opening (ie, engine load) linked to the accelerator pedal movement. ) Is equal to or greater than a predetermined value and the rate of change in opening is equal to or greater than a predetermined value, it is determined that the vehicle driving force is to be increased, and the engine is started.
[0005]
[Problems to be solved by the invention]
By the way, according to the driving mode peculiar to such a hybrid vehicle, in the low-speed traveling state such as traveling on a congested road, since the traveling is performed only by the motor instead of the engine, the following problems may occur. It has been pointed out from the past.
[0006]
In other words, in a low-speed driving state where low-speed driving continues for a long time, such as driving on a congested road, cooling in the engine room by the driving wind cannot be expected. For this reason, the generator arranged in the engine room causes a decrease in capacity due to an increase in temperature, and the output driving force decreases compared to that at normal temperature.
[0007]
In addition, in an air conditioner arranged in an engine room, as the ambient temperature in the engine room increases, the vehicle interior temperature also increases and the cooling load in the vehicle increases. Driving will continue. The continuation of the high load operation of the compressor driving motor leads to an increase in the temperature of the motor, resulting in a decrease in the driving force output, and an increase in the temperature of the engine room due to the increase in the temperature of the motor. As the increase in the cooling load in the vehicle is further promoted and the driving load of the compressor driving motor is further increased, the vigorous cycle is repeated, and as a result, the amount of power stored in the battery is increased by increasing the power consumption of the compressor driving motor. Rapidly decreases and the amount of stored electricity becomes insufficient, and the terminal voltage decreases. Further, the temperature of the battery gradually increases due to the continuous discharge to the compressor driving motor, so that the terminal voltage with respect to the amount of electricity stored decreases. The supply current from the battery to the generator decreases due to a decrease in the terminal voltage due to the shortage of the amount of electricity stored in the battery.
[0008]
As described above, in the low-speed running state and the state where the air conditioner is activated, in addition to the decrease in the capacity of the generator itself, the supply current to the generator decreases as the terminal voltage of the battery decreases. This makes it impossible to secure the driving force for starting the engine in the generator. For example, when the engine is started by the generator in response to a power storage request or a driving force increase request, the starting becomes difficult. Is possible.
[0009]
As one means for ensuring engine startability by such a generator, it is conceivable to increase the amount of electricity stored in the battery by operating the engine at a high output and driving the generator by its driving force to generate power. Since the power generation by the high output operation of such an engine causes the fuel efficiency to be greatly impaired, it is not preferable in view of the ultimate purpose of the hybrid vehicle of low fuel consumption.
[0010]
Therefore, in the present invention, in view of the above-described problems, in a hybrid vehicle, engine start-up failure in a situation where the battery storage amount is insufficient can be realized while suppressing deterioration of fuel consumption performance as much as possible. It was made for the purpose of doing so.
[0011]
[Means for Solving the Problems]
In the present invention, the following configuration is adopted as a specific means for solving such a problem.
[0012]
In a first aspect of the present invention, in a hybrid vehicle in which an engine and a motor supplied with power from a battery are provided as drive sources, and the engine is stopped and driven only by the motor in a traveling region where the traveling load is low. A low-speed traveling state detecting means for detecting a low-speed traveling state in which the traveling period by the motor is excessive, and an air-conditioning operation detecting means for detecting the 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 running state and in the air-conditioning operation state based on signals from the low-speed running state detecting unit and the air-conditioning operation detecting unit, the engine start timing with respect to the amount of charge of the battery is advanced.
[0013]
In the second invention of the present application, in a hybrid vehicle in which an engine and a motor supplied with power from a battery are provided as driving sources, and the engine is stopped and driven only by the motor in a traveling region where the traveling load is low. A low-speed traveling state detecting means for detecting a low-speed traveling state in which the traveling period by the motor is excessive, and an air-conditioning operation detecting means for detecting the 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 running state and in the air-conditioning operation state based on signals from the low-speed running state detecting unit and the air-conditioning operation detecting unit, the engine stop timing is delayed with respect to the stored amount of the engine. .
[0014]
In a third invention of the present application, in a hybrid vehicle in which an engine and a motor supplied with power from a battery are provided as drive sources, and the engine is stopped and driven only by the motor in a traveling region where the traveling load is low. A low-speed traveling state detecting means for detecting a low-speed traveling state in which the traveling period of the motor is excessive, an air-conditioning operation detecting means for detecting an operation of a vehicle air conditioner that drives a compressor by the motor, and the engine An engine drive detecting means for detecting drive, and detecting that the vehicle is in the low-speed running state and the air-conditioning operating state based on signals from the low-speed running state detecting means and the air-conditioning operation detecting means. When the engine drive is detected by a signal from the means, the engine is By rolling 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 by regulating the vehicle running by the motor.
[0015]
In the fourth invention of the present application, in the hybrid vehicle according to the third invention, in a state where the vehicle running by the driving force of the engine and the power storage by driving the generator are performed, the vehicle running by the motor is restricted. The generator current generated is directly supplied to the compressor of the vehicle air conditioner without passing through the battery.
[0016]
In the fifth invention of the present application, in a hybrid vehicle in which an engine and a motor supplied with power from a battery are provided as drive sources, and the engine is stopped and driven only by the motor in a traveling region where the traveling load is low. A low-speed traveling state detecting means for detecting a low-speed traveling state in which the traveling period by the motor is excessive, and an air-conditioning operation detecting means for detecting the 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 the signals from the low-speed running state detection unit and the air-conditioning operation detection unit, the supply current to the generator that starts the engine is reduced. Yes.
[0017]
【The invention's effect】
In the present invention, the following effects can be obtained by adopting such a configuration.
[0018]
(A) According to the hybrid vehicle of the first invention of the present application, the low-speed traveling state detecting means for detecting a low-speed traveling state in which the traveling period by the motor is excessive, and the vehicle air conditioner for driving the compressor by the motor. Air-conditioning operation detecting means for detecting the operation of the device, and when it is detected that the vehicle is in the low-speed running state and in the air-conditioning operation state, that is, the battery is charged with a decrease in power storage action and excessive current consumption. Under a situation where there is a possibility that the amount of the generator is insufficient and the driving force of the generator is insufficient, the engine start timing with respect to the amount of charge (remaining amount) of the battery is earlier than in the case other than the above state.
[0019]
As a result, for example, when the engine stop timing with respect to the storage amount of the battery is constant, the entire storage period is increased by the advancement of the start timing, and a sufficient storage amount is secured in the battery. It will be. Therefore, when it is necessary to increase the vehicle driving force by starting the engine, for example, when shifting from a congested road to accelerating, the engine is operated by supplying an appropriate current from the battery to the generator. The engine can be reliably started, and the reliability in terms of the startability can be improved.
[0020]
(B) According to the hybrid vehicle of the second invention of the present application, the low-speed traveling state detecting means for detecting the low-speed traveling state in which the traveling period by the motor becomes excessive, and the vehicle air conditioner for driving the compressor by the motor. Air-conditioning operation detecting means for detecting the operation of the device, and when it is detected that the vehicle is in the low-speed running state and in the air-conditioning operation state, that is, the battery is charged with a decrease in power storage action and excessive current consumption. Under a situation where there is a possibility that the amount of the generator is insufficient and the driving force of the generator is insufficient, the engine stop timing with respect to the amount of charge (remaining amount) of the battery is delayed compared to the case other than the above state.
[0021]
As a result, for example, when the engine start timing with respect to the battery charge amount is constant, the overall charge period is increased by the delay of the stop timing, and a sufficient amount of electricity is secured in the battery. Become. Therefore, when it is necessary to increase the vehicle driving force by starting the engine, for example, when shifting from a congested road to accelerating, the engine is operated by supplying an appropriate current from the battery to the generator. The engine can be reliably started, and the reliability in terms of the startability can be improved.
[0022]
(C) According to the hybrid vehicle of the third invention of the present application, the vehicle air conditioner that drives the compressor by the motor in a low-speed traveling state in which the traveling period by the motor is excessive, that is, When driving of the engine is detected in a situation where the storage capacity of the battery may be 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 efficiently and driving the vehicle with the driving force and regulating the vehicle driving by the motor, a decrease in the amount of electricity stored in the battery is suppressed, and since the engine is in a low-speed driving state, there is a surplus in the driving force of the engine. The amount of power stored in the battery can be increased by using this surplus power for power generation by the generator.
[0023]
Due to the suppression of the decrease in the amount of electricity stored in the battery and the execution of electricity storage in the battery, the amount of electricity stored in the battery is in a low-speed traveling state where it is difficult to maintain the amount of electricity stored in the battery and in the air conditioning operation state. Is always properly maintained. Therefore, for example, when the engine drive for power storage is stopped, the vehicle travels from a congested road to accelerate and the engine is started to increase the vehicle driving force. Electric current is supplied, and the engine can be started reliably.
[0024]
(D) According to the hybrid vehicle of the fourth invention of the present application, in addition to the effect described in the above (c), the following specific effect is exhibited. That is, in the hybrid vehicle of the present invention, when 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, the generated current of the generator is supplied to the battery. Since the power is supplied directly to the compressor of the vehicle air conditioner without intervention, the supply current to the compressor is not affected by the voltage drop in the battery. As a result, the fuel consumption performance can be maintained by the effective use of the generated current and the effective use of the engine driving force.
[0025]
(E) According to the hybrid vehicle of the fifth invention of the present application, the low-speed traveling state detecting means for detecting the low-speed traveling state in which the traveling period by the motor becomes excessive, and the vehicle air conditioner for driving the compressor by the motor. Air-conditioning operation detecting means for detecting the operation of the device, and when it is detected that the vehicle is in the low-speed running state and in the air-conditioning operation state, that is, the battery is charged with a decrease in power storage action and excessive current consumption. In a situation where the amount is insufficient and the drivability of the generator may be insufficient, the supply current to the generator that starts the engine is reduced.
[0026]
As a result, a decrease in the amount of electricity stored in the battery is suppressed by the amount by which the supply current to the generator is reduced, and the engine is started somewhat slowly due to the decrease in the supply current to the generator. Since the traveling state is originally a low-speed traveling state in which the responsiveness for increasing the driving force is not so required, there is no problem in terms of engine startability. That is, according to the hybrid vehicle of the present invention, it is possible to maintain both the battery charge amount and the engine startability even in a situation where the battery charge amount is insufficient.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a hybrid vehicle according to the present invention will be described in detail based on preferred embodiments.
[0028]
FIG. 1 shows a drive system system of a hybrid vehicle according to the present invention. In FIG. 1, reference numeral 1 is an engine, 2 is an automatic transmission unit, 3 is connected to the engine 1 via a transmission mechanism 13. The engine side motor, 4 is a drive side motor, 5 is a battery, 6 is a current control controller, 7 is a converter, and 8 is a system controller. The automatic transmission unit 2 includes a torque converter 21, a clutch 23, an automatic transmission 22, and a gear train 24, and the gear train 24 of the automatic transmission unit 2 is driven via an axle 14. The front wheels 15 and 15 serving as wheels are connected, and the driving motor 4 is connected via a motor output shaft 12. The engine 1 includes a variable valve mechanism, for example, and is configured to perform high-efficiency operation with low fuel consumption in a rotation speed range near 2000 to 3000 rpm. The engine-side motor 3 is driven by the current from the battery 5 to crank the engine 1, and in a specific running state (described later), the driving force is supplied to the engine-side motor 3 via the transmission mechanism 13. While being transmitted to the engine 1 as travel driving force, the battery 5 is stored by generating electricity by being driven by the engine 1. The drive motor 4 is driven by a current supplied from the battery 5.
[0029]
Further, reference numeral 31 denotes a brake pedal, and the displacement of the brake pedal 31 is input to the brake controller 33 as a brake signal, and 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 the accelerator controller 34 as an accelerator signal, and the operation control of the engine 1 is performed by a control signal from the accelerator controller 34.
[0030]
Reference numeral 41 denotes a heat pump type air conditioner that cools the driving motor 4 disposed in the engine room as well as the air conditioning in the vehicle, and includes a motor (not shown) and a compressor driven by the motor. . Reference numeral 42 denotes a vehicle system that controls electric equipment on the vehicle side, 43 denotes a power steering motor, 44 denotes a power steering oil pump, and 45 denotes a power train oil pump.
[0031]
As described above, the hybrid vehicle includes the engine 1 and the drive side motor 4 as a main drive source, and also includes the engine side motor 3 that functions as a generator as a sub drive source. Is selected and used in accordance with the running state of the vehicle, thereby realizing low fuel consumption driving. In FIG. 1, the current supply path is indicated by black arrows.
[0032]
Here, basic control (map control) of this hybrid vehicle will be described with reference to FIGS.
[0033]
FIG. 4 shows operating states of the drive system, that is, the engine 1, the engine side motor 3, the drive side motor 4, and the battery 5 for each traveling state of the vehicle. Here, as the running state, six states are set: “when stopped”, “when starting”, “when starting the engine”, “at the time of steady running”, “at the time of sudden acceleration”, and “at the time of deceleration”. The “starting time” is further divided into “slow starting” and “sudden starting”. Furthermore, the “during steady running” is divided into “low load”, “medium load”, and “high load”. The operating state of the drive system in each of these traveling states is as follows.
[0034]
A: Operation when stopped (state indicated by (1) in FIG. 3)
The engine 1 is stopped in principle. However, even when the vehicle is stopped, it is operated exceptionally when the engine needs to be warmed up and when the capacity of the battery that needs to be stored decreases (that is, when the stored amount of the battery 5 decreases). The
[0035]
The engine side motor 3 is stopped in principle. However, even when the vehicle is stopped, when the engine 1 is in operation, it is driven to generate power.
[0036]
The drive motor 4 is stopped without exception.
[0037]
When the engine-side motor 3 is generating power, the battery 5 stores power by receiving the generated current from the engine-side motor 3.
[0038]
Whether or not the battery 5 needs to be charged is determined by comparing the amount of charge stored in advance with a start reference charge amount and a stop reference charge amount. For example, when the amount of charge decreases to the start reference charge amount, To start storing power (starting the engine 1), and when the power storage amount reaches the stop reference power storage amount due to the progress of power storage, a power storage stop request is issued at that time to stop the power storage (stop the engine 1). ) Is the basic control. However, in this embodiment, as will be described later, in a specific traveling state, power storage is started at a time when the power storage amount is larger than the start reference power storage amount (see step S3 in FIG. 2), or stop reference power storage. By stopping power storage when the amount of power storage is larger than the amount (see step S4 in FIG. 2), the power storage period is extended to ensure the required amount of power storage.
[0039]
B: Operation when starting
B-1: Operation during slow start (state indicated by (2) in FIG. 3)
The engine 1 is stopped.
[0040]
The engine side motor 3 is stopped in response to the stop of the engine 1.
[0041]
The drive side motor 4 is driven by the current supplied from the battery 5 and is in a “power running” state in which the vehicle travels with the driving force.
[0042]
The battery 5 discharges the driving side motor 4 to drive the driving side motor 4.
[0043]
Therefore, at the time of slow start, the vehicle travels (starts) only by the driving force of the drive side motor 4.
[0044]
B-2: Operation during sudden start (state indicated by (3) in FIG. 3)
The engine 1 is operated at a high output after startup.
[0045]
The engine-side motor 3 is driven by a current supplied from the battery 5 and is in a “power running” state in which the vehicle travels with the driving force.
[0046]
The drive side motor 4 is driven by the current supplied from the battery 5 and is in a “power running” state in which the vehicle travels with the driving force.
[0047]
The battery 5 discharges the engine side motor 3 and the drive side motor 4 to drive both the engine side motor 3 and the drive side motor 4.
[0048]
Therefore, at the time of sudden start, the vehicle travels (starts) by the cooperation of the three driving forces of the engine 1, the engine side motor 3, and the drive side motor 4.
[0049]
C: Operation when the engine is started (state indicated by (4) in FIG. 3)
The engine 1 is started by receiving a driving force from the engine side motor 3.
[0050]
The engine side motor 3 is driven by a current supplied from the battery 5 and is in a “power running” state in which the engine 1 is started by the driving force.
[0051]
The drive side motor 4 is stopped.
[0052]
The battery 5 discharges the engine side motor 3 to drive the engine side motor 3.
[0053]
The engine 1 is started by the driving force of the engine-side motor 3, and the generated driving force of the engine-side motor 3 depends on the current value supplied from the battery 5. In this embodiment, as will be described later, in a specific traveling state, the supply current to the engine-side motor 3 is intentionally reduced (see step S7 in FIG. 2) to suppress a decrease in the charged amount of the battery 5. Like to do.
[0054]
D: Operation during steady running
D-1: Operation in a low load range (state indicated by (5) in FIG. 3)
The engine 1 is stopped in principle. However, even when the load is low, the engine is exceptionally operated when the engine needs to be warmed up and when the battery capacity that requires power storage decreases.
[0055]
The engine side motor 3 is stopped in principle. However, even when the load is low, when the engine 1 is operating, it is driven to generate power.
[0056]
The drive side motor 4 is driven by the current supplied from the battery 5 and is in a “power running” state in which the vehicle travels with the driving force.
[0057]
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 and stores it.
[0058]
Therefore, the steady running at a low load is carried out only by the driving force of the drive side motor 4.
[0059]
D-2: Operation in medium load range (state indicated by (6) in FIG. 3)
The engine 1 performs high-efficiency driving and causes the vehicle to travel with the driving force.
[0060]
The engine side motor 3 is driven by the engine 1 to generate power.
[0061]
The drive side motor 4 is set to a non-output state in which the drive side motor 4 idly receives the driving force from the front wheel 15 side.
[0062]
The battery 5 is charged by receiving the generated current of the engine side motor 3.
[0063]
Accordingly, the steady running at a medium load is carried out only by the driving force of the engine 1.
[0064]
D-3: Operation in a high load region (illustration is omitted in FIG. 3)
The engine 1 performs a high output operation and causes the vehicle to travel with the driving force.
[0065]
The engine-side motor 3 receives power from the engine 1 when there is a margin in the driving force, and generates power. In other cases, the engine-side motor 3 is driven by receiving current from the battery 5 to drive the vehicle. It is said.
[0066]
The drive side motor 4 is driven by the current supplied from the battery 5 and is in a “power running” state in which the vehicle travels with the driving force.
[0067]
The battery 5 discharges the engine side motor 3 and the drive side motor 4 to drive them.
[0068]
Therefore, the steady running under high load means that the vehicle runs with the driving force obtained by adding the driving force of the engine 1 and the driving side motor 4 and the driving force when the engine side motor 3 is in the power running state. Done.
[0069]
E: Operation during sudden acceleration (not shown in FIG. 3)
The engine 1 performs a high output operation and causes the vehicle to travel with the driving force.
[0070]
The engine side motor 3 is driven by receiving a current from the battery 5 and is in a power running state in which the vehicle travels.
[0071]
The drive side motor 4 is driven by the current supplied from the battery 5 and is in a “power running” state in which the vehicle travels with the driving force.
[0072]
The battery 5 discharges the engine side motor 3 and the drive side motor 4 to drive them.
[0073]
Therefore, at the time of rapid acceleration, the vehicle travels by the three driving forces of the engine 1, the engine side motor 3, and the drive side motor 4.
[0074]
F: Operation during deceleration (state indicated by (9) in FIG. 3)
The engine 1 is stopped.
[0075]
The engine side motor 3 is stopped.
[0076]
The drive motor 4 is brought into a regenerative state in which power is generated by being driven by receiving a driving force from the front wheel 15 side.
[0077]
The battery 5 receives the regenerative current from the drive side motor 4 and stores power.
[0078]
As described above, the engine 1, the engine-side motor 3, and the drive-side motor 4, which are drive sources, are selectively operated according to the traveling state of the vehicle, respectively. The objective is achieved.
[0079]
By the way, according to the drive mode peculiar to the hybrid vehicle having such a control mode, in the low speed running state such as running on a congested road, running by only the motor is performed instead of the engine, and each motor 3, 4 and the battery 5 are not cooled, and instead the cooling is performed by the air conditioner 41 having a compressor with a large current consumption, so that the battery 5 is insufficiently charged and the startability of the engine 1 may be impaired. This is as described above.
[0080]
Therefore, in the hybrid vehicle of this embodiment, the present invention is applied to realize good engine startability in a low-speed traveling state while suppressing deterioration of fuel consumption performance as much as possible.
[0081]
Hereinafter, the control of the drive system of the hybrid vehicle for achieving this object will be specifically described with reference to the flowchart shown in FIG.
[0082]
In the flowchart of FIG. 2, after the control is started, first, in step S <b> 1, it is determined whether or not the air conditioner 41 that consumes a large amount of current is activated. Here, when it is determined that the air conditioner 41 is not operating, it is determined that a situation in which the storage amount of the battery 5 is insufficient does not occur, and normal map control (basic control in FIG. 4) is executed. (Step S8).
[0083]
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, even if the air conditioner 41 is in operation, it is determined that there is no shortage of the amount of power stored in the battery 5 and normal map control is executed. (Step S8).
[0084]
On the other hand, if it is determined that the vehicle is traveling on a congested road, in order to extend the power storage period of the battery 5 and increase the power storage amount, the start timing of the engine 1 with respect to the power storage amount is set early in step S3. In step S4, the stop timing of the engine 1 with respect to the charged amount is corrected to the delay side, and in step S5, the engine 1 is started to suppress a decrease in the charged amount of the battery 5. The supply current of the engine side motor 3 (that is, the generator) at the time is reduced.
[0085]
Thereafter, in step S6, it is determined whether or not there is a request for starting the engine 1. Here, when it is determined that there is no start request, it is determined that the situation where the battery 5 is insufficient in charge can be avoided by the response in steps S3 to S5, the control is returned as it is.
[0086]
On the other hand, when it is determined that the engine 1 has been requested to start due to a lack of vehicle driving force, the required vehicle driving force is secured and the battery 5 is charged while maintaining good fuel efficiency. In order to eliminate the shortage, the control in step S7 is executed. That is, first, with the start of the engine 1, the drive motor 4 is stopped to suppress a decrease in the charged amount of the battery 5. In addition, the engine 1 is driven with high efficiency, and the vehicle is driven by the driving force. Since the vehicle 1 is running on a congested road, the driving force of the engine 1 has a surplus power, so the engine-side motor 3 is driven by the surplus power. The generated current is stored in the battery 5 to increase the amount of stored power. Further, the current generated by the engine side motor 3 is passed through the battery 5 in order to maintain good fuel efficiency by operating the air conditioner 41 more effectively using the generated current of the engine side motor 3. Without being directly supplied to the compressor of the air conditioner 41, the influence of the voltage drop caused by the battery 5 is eliminated.
[0087]
By continuously executing the above control in the low-speed traveling state, a situation where the battery 5 is insufficiently charged is prevented in advance, and the startability of the engine 1 is maintained well.
[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 in the hybrid vehicle shown in FIG. 1;
[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, Reference numeral 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.

Claims (5)

A hybrid vehicle provided with an engine and a motor powered by a battery as a driving source, and stopped in the traveling region where the traveling load is low, and is driven to travel only by the motor,
Low-speed running state detecting means for detecting a low-speed running state in which the running period by the motor is excessive;
Air-conditioning operation detection means for detecting the operation of the vehicle air-conditioning device that drives the compressor by the motor,
When the low-speed running state is detected and the air-conditioning operation state is detected based on the signals from the low-speed running state detecting unit and the air-conditioning operation detecting unit, the engine start timing with respect to the amount of charge of the battery is advanced. A hybrid car. A hybrid vehicle provided with an engine and a motor powered by a battery as a driving source, and stopped in the traveling region where the traveling load is low, and is driven to travel only by the motor,
Low-speed running state detecting means for detecting a low-speed running state in which the running period by the motor is excessive;
Air-conditioning operation detection means for detecting the operation of the vehicle air-conditioning device that drives the compressor by the motor,
When the low-speed running state is detected and the air-conditioning operation state is detected based on the signals from the low-speed running state detecting unit and the air-conditioning operation detecting unit, the engine stop timing with respect to the amount of charge of the battery is delayed. A hybrid car. A hybrid vehicle provided with an engine and a motor powered by a battery as a driving source, and stopped in the traveling region where the traveling load is low, and is driven to travel only by the motor,
Low-speed running state detecting means for detecting a low-speed running state in which the running period by the motor is excessive;
Air-conditioning operation detecting means for detecting the operation of the vehicle air-conditioning apparatus that drives the compressor by the motor;
Engine drive detection means for detecting the drive of the engine,
Based on the signals from the low-speed traveling state detection means and the air-conditioning operation detection means, it is detected that the vehicle is in the low-speed traveling state and the air-conditioning operation state, and the engine drive is detected by the signal from the engine drive detection means. When the engine is operated, the vehicle is driven with high efficiency so that the vehicle travels by the driving force of the engine and the battery is charged by the power generation by driving the generator, and the vehicle travel by the motor is restricted. A hybrid car. In claim 3,
In a state in which the vehicle running by the driving force of the engine and the power storage by driving the generator are performed and the vehicle running by the motor is restricted, the generated current of the generator is not passed through the battery. A hybrid vehicle characterized by being supplied directly to the compressor. A hybrid vehicle provided with an engine and a motor powered by a battery as a driving source, and stopped in the traveling region where the traveling load is low, and is driven to travel only by the motor,
Low-speed running state detecting means for detecting a low-speed running state in which the running period by the motor is excessive;
Air-conditioning operation detection means for detecting the operation of the vehicle air-conditioning device that drives the compressor by the motor,
When 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 unit and the air-conditioning operation detecting unit, the supply current to the generator that starts the engine is reduced. A hybrid car.

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