JP2000295710A - Charge control device of hybrid electric automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable omitting start confirmation of re-charging work and improving working efficiency of re-charging when a battery is temporarily in the state of empty charge. SOLUTION: When a DC/DC converter 37 starts voltage stepping-up operation, a main controller 35 detects the charged state of a main battery 31. When the state recovers as far as a state that an engine can start, the main controller 35 controls the engine 11 so as to start in accordance with the rotation of a generator 13 by supplying the power from the main battery 31 to the generator 13. When the engine 11 is started, the power from the generator 13 is controlled so as to charge the main battery 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a charge control for a hybrid electric vehicle which can automatically recharge a battery when the battery mounted on the hybrid electric vehicle is temporarily idled. Related to the device.

[0002]

2. Description of the Related Art In recent years, as a hybrid electric vehicle for improving the cruising distance of an electric vehicle, for example, a parallel hybrid vehicle (PHEV) capable of driving an axle with a motor and an engine has been developed.

In this hybrid electric vehicle,
A cell motor for starting the engine and a high-voltage battery for supplying power to the motor are provided.
However, when such a vehicle is left unused for a long time, the battery is discharged and the vehicle may not be able to start.

Therefore, in a conventional hybrid electric vehicle, low-voltage power is supplied from another vehicle or a rescue vehicle.
The DC / DC converter was used to boost the voltage to a high voltage system and charge the main battery.

[0005] Then, after a certain period of time is measured by a timer after the boost switch provided in the DC / DC converter is pressed, charging of the main battery is stopped. Next, the start key is turned to supply the electric power from the main battery to the starter motor, and the engine is restarted according to the rotation of the starter motor. As a result, when the engine is started at the time of restart, the vehicle can run.

[0006]

However, in the conventional hybrid electric vehicle, when the amount of charge in the main battery is insufficient, the engine cannot be started, and the recharge to the main battery is performed in the above-described procedure. Charging work had to be performed.

In particular, in a cold region, it takes a longer time than a charging time in a warm region to reach a charging state in which the engine can be started using the main battery. For this reason,
It was necessary to repeat recharging work for a long time.

Further, since the system is configured to confirm whether the vehicle can be started by turning the start key, there is a problem that the user may be forced to repeat the confirmation work and the recharging work.

[0009] The present invention has been made in view of the above,
The purpose is to charge the hybrid electric vehicle, which can eliminate the need to confirm the start of recharging work when the battery is temporarily in an empty charge state, and can contribute to improving work efficiency at the time of recharging. It is to provide a control device.

[0010]

According to the first aspect of the present invention,
In order to solve the above problems, a motor driving an axle, an engine driving the axle, and an intermittent machine provided between the axle and the engine, for switching between transmission and non-transmission of the driving force of the engine. A generator that starts the engine and generates electric power by the driving force of the engine;
A hybrid electric vehicle including a battery that performs charging and discharging between the motor and the generator, and a booster that boosts a voltage to charge the battery, wherein the booster starts a charging operation. A charging state detecting means for detecting a charging state of the battery; a determining means for determining whether or not the charging state of the battery has recovered to a state where the generator can start the engine; and It is a gist of the present invention to have a charging stop means for stopping the charging operation of the booster based on the determination result.

According to a second aspect of the present invention, in order to solve the above-mentioned problem, the booster is configured to input electric power supplied from the outside.

According to a third aspect of the present invention, in order to solve the above problem, when the determination means determines that the state of charge of the battery has been restored to a state in which the engine can be started, it indicates that the engine can be started. The gist of the present invention is to have display means for performing the above.

According to a fourth aspect of the present invention, in order to solve the above-mentioned problem, based on a result of the determination by the determination means, the intermittent device is disconnected, and power is supplied from the battery to the generator. The gist of the present invention is to have control means for controlling the engine to start.

According to a fifth aspect of the present invention, when the start of the engine is completed, the control means operates the generator by the driving force of the engine to bring the battery into a predetermined charged state. The gist is to control the battery to be charged until the battery is fully charged.

[0015]

According to the present invention, when the booster starts the boosting operation, the state of charge of the battery is detected, and the state of charge of the battery is restored to a state in which the engine can be started. In such a case, the power from the battery is supplied to the generator to control the engine to start according to the rotation of the generator, and when the engine is started, the power from the generator is charged to the battery. By controlling, when the battery is temporarily idle, the booster starts the boosting operation and then recovers the charged state of the battery to the state where the engine can be started. Since the control is performed to charge the battery with the electric power from the machine, the start confirmation of the recharging work can be omitted, which can contribute to the improvement of the work efficiency at the time of recharging.

According to the second aspect of the present invention, by inputting electric power supplied from the outside to the booster, the battery mounted on the hybrid electric vehicle is temporarily in an empty charge state. Even in such a case, electric power can be supplied from an external rescue vehicle or a general vehicle equipped with a 12V battery.

According to the third aspect of the present invention, when it is determined that the state of charge of the battery has recovered to a state in which the engine can be started, the fact that the engine can be started is displayed, so that the charging operation can be performed. The operator can more easily confirm the completion.

According to the fourth aspect of the present invention, based on the determination result, the intermittent machine is disconnected, and the power is supplied from the battery to the generator to start the engine. , To charge the battery using a generator,
The load on the power supply source (such as an external rescue vehicle) to the booster can be minimized, and the charged state of the battery can be restored to a favorable state.

According to the fifth aspect of the present invention, when the start of the engine is completed, the generator is operated by the driving force of the engine to control the battery to be charged until the battery reaches a predetermined state of charge. In order to charge the battery using the generator, the burden on the power supply source (such as an external rescue vehicle) to the booster can be minimized, and the battery can be returned to a good state of charge. it can.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a diagram showing a system configuration of a hybrid electric vehicle 1 according to one embodiment of the present invention.

In FIG. 1, an engine 11 is an internal combustion engine that generates power, and drives an electric generator 13 and a motor 17 and a transmission 1 while a clutch 15 is connected.
9. Drive the front wheel tires 13 via the drive shaft 21. Further, the motor 17 drives the front wheel tire 13 via a transmission 19 and a drive shaft 21.

The power cable 25 electrically connects the high-voltage main battery 31 to the generator controller 27 and the motor controller 29. The main battery 31 is electrically connected from the power cable 25 to the generator 13 via the generator controller 27, and is electrically connected from the power cable 25 to the motor 17 via the motor controller 29. Further, the main battery 31 is electrically connected to a 12 V battery 39 from the power cable 25 via a DC / DC converter 37.

The generator controller 27 controls the operation of an internal inverter, converts the three-phase AC generated by the generator 13 into DC power, and charges the high-voltage main battery 31.

The motor controller 29 controls the operation of an internal inverter, converts DC power supplied from the main battery 31 into three-phase AC, and supplies the three-phase AC to the motor 17.

The engine controller 33 controls the electronic throttle (not shown) of the engine by inputting the depression amount of an accelerator pedal (not shown) and the number of revolutions of the engine. Further, the engine controller 33 includes the clutch 1
The presence / absence of the connection state 5 is stored, and the clutch 15 is connected / disconnected according to a control command from the main controller 45.

The main controller 35 sends a control signal indicating start of power generation, stop of power generation, and the like to the generator controller 27 according to the state of charge of the main battery 31. Further, the main controller 35 determines a vehicle speed signal input from a vehicle speed sensor (not shown), controls the vehicle to perform SHEV traveling in a low speed range, and controls the PHEV in a middle and high speed range.
Control is performed so as to perform EV traveling, and further, control is performed such that PSHEV traveling is performed when the required driving force is small.

The main controller 35 inputs a current signal, a voltage signal, and a temperature signal from a current sensor, a voltage sensor, and a temperature sensor attached to the high-voltage main battery 31, and based on the voltage value and the current value of the battery. The state of charge (SOC) of the battery is obtained by performing an integration operation, and the obtained state of charge is corrected according to the temperature of the battery to calculate the state of charge (SOC) with high accuracy. Then, when the state of charge of the battery 31 falls below a predetermined value, the main controller 35 outputs a power generation request to the generator controller 27.

The DC / DC converter 37 is connected to the battery 3
9 can be connected to a power supply of, for example, 12 V from an external rescue vehicle via a cable 41 as needed.
The power of the system is converted into the power of the high-voltage system described above, and the main battery 31 is charged.

Next, the operation of the charge control device for a hybrid electric vehicle will be described with reference to the flowchart shown in FIG.

When the hybrid electric vehicle as shown in FIG. 1 is left unused for a long time, the main battery 31 is discharged, and the vehicle cannot be started. Therefore, the driver receives supply of low-voltage power from another vehicle or a rescue vehicle.

First, the low-voltage system 12V of another vehicle or rescue vehicle is connected to connection points P + and P- between the DC / DC converter 37 and the battery 39 via the cable 41. Then, the driver presses the boost switch 43 provided on the DC / DC converter 37.

It is assumed that while the DC / DC converter 37 is operating, the 12 V power supply VDD is supplied to the main controller 35 via the power supply line, and the main controller 35 is operating.

The operation of the main controller 35 will be described below.

First, in step S10, it is determined whether or not the boost switch 43 provided in the DC / DC converter 37 has been pressed and turned on. The process returns to step S10 until the boost switch 43 is pressed, and this determination processing is performed. repeat.

When the boost switch 43 is pressed, the process proceeds to step S20, where the DC / DC converter 37 is activated, and the 12V power supplied from the external rescue vehicle via the cable 41 is supplied to the above-described high voltage power supply. And the main battery 31 is charged.

In step S30, the main controller 35 inputs a current signal, a voltage signal, and a temperature signal from a current sensor, a voltage sensor, and a temperature sensor attached to the high-voltage main battery 31. An integration operation is performed based on the input voltage value V and the current value I to obtain a state of charge (SOC) of the main battery 31.
Is calculated, and the obtained state of charge value is
1 that is corrected in accordance with the temperature T of the battery 1 (S
OC) is calculated.

Then, in a step S40, it is determined whether or not the current state of charge of the main battery 31 has exceeded the state in which the engine can be started. If the current state of charge has not reached the engine startable state value, step S3
Returning to 0, the charge state calculation process is repeated.

It should be noted that the engine startable state value is the electric power at the time of disengaging the clutch, the electric power used by the generator at the time of starting the engine,
This is a value obtained by multiplying a sum of the power of the fuel injection system to the engine, the power of the engine controller 33 including the ignition system, the power of the generator controller 27, and the like by a predetermined safety coefficient. 35 is stored in an internal ROM.

On the other hand, if the current state of charge exceeds the value at which the engine can be started, the engine is ready to be started.
The C converter 37 is stopped. At this stage, the driver may be notified by a buzzer or the like that the engine can be started.

In step S60, a clutch disconnection command is sent to the engine controller 33, and the clutch 1
5 is cut. In step S70, an engine start command is output to the generator controller 27 and the engine controller 33.

As a result, power is supplied from the main battery 31 to the generator controller 27, and the generator controller 27 applies three-phase alternating current sufficient to generate a predetermined number of revolutions and drive torque to the generator 13, and the generator 13 Starts to rotate. At the same time, a predetermined throttle opening, an ignition timing signal corresponding to the engine speed, a fuel injection signal, and the like are output from the engine controller 33 to the engine 11, and the engine is started according to the rotation by the generator 13 described above.
The engine 11 generates a driving force in an efficient state under the control of the engine controller 33.

Then, at step 80, the engine 11
When the generator 13 starts to rotate due to the driving force generated, the generator controller 27 controls the generator 13 to start charging the main battery 31.

In step 90, the main controller 3
5 monitors the state of charge of the main battery 31 and determines whether or not the SOC of the main battery 31 has reached a predetermined value (for example, 50%) or more. SOC of main battery 31
The charging is continued until becomes equal to or more than the predetermined value. When the value becomes equal to or more than the predetermined value, the routine proceeds to step 100, where the engine 11 is stopped to stop the power generation, and the entire process is ended.

As described above, when the DC / DC converter starts the step-up operation, the state of charge of the main battery is detected, and when the state of charge of the main battery is restored to the state where the engine can be started, Control to supply electric power from the main battery to the generator to start the engine according to the rotation of the generator, and to control the electric power from the generator to charge the main battery when the engine is started. Then, when the main battery is temporarily in the idle charge state, the DC / DC converter starts the boosting operation, then recovers the charge state of the main battery to the engine startable state, and further starts the engine. Since the power from the generator is controlled so as to charge the main battery, it is possible to omit the confirmation of the start of recharging work, It is possible to contribute to the improvement of work efficiency.

Further, by inputting electric power supplied from the outside to the DC / DC converter, even when the main battery mounted on the hybrid electric vehicle is temporarily idled, an external rescue vehicle or an external rescue vehicle can be used. Electric power can be supplied from a general vehicle equipped with a 12V battery.

Further, a memory indicating that the engine can be started is displayed at a predetermined position in the meter indicator. If it is determined that the charged state of the battery has been restored to a state where the engine can be started, the engine can be started. Is displayed, the operator can more easily confirm that the charging operation has been completed.

Further, based on the determination result, the intermittent device is disconnected, and the battery is supplied with electric power to the generator to control the start of the engine, thereby charging the battery using the generator. To do so, the burden on the power supply source (such as an external rescue vehicle) to the booster can be minimized, and the battery can be returned to a good state of charge.

When the start of the engine is completed, the generator is operated by the driving force of the engine to control the battery to be charged until a predetermined charge state is reached, thereby charging the battery using the generator. Therefore, the load on the power supply source (such as an external rescue vehicle) to the booster can be minimized, and the charged state of the battery can be returned to a favorable state.

[Brief description of the drawings]

FIG. 1 is a diagram showing a system configuration of a hybrid electric vehicle 1 according to one embodiment of the present invention.

FIG. 2 is a flowchart for explaining an operation of a charge control device for a hybrid electric vehicle.

[Explanation of symbols]

 11 Engine 13 Generator 15 Clutch 17 Motor 25 Power Cable 27 Generator Controller 29 Motor Controller 31 Main Battery 37 DC / DC Converter 33 Engine Controller 35 Main Controller 39 Battery 43 Boost Switch 41 Cable

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2G016 CA03 CB12 CB32 CC01 CC04 CC06 CC12 CC27 CC28 CE00 5H115 PG04 PI16 PI24 PI29 PO09 PU01 PU22 PU24 PU25 PV02 PV09 QN03 RB08 RE01 SE02 SE05 TB01 TI01 TI05 TI06 TI10 TO21 TR19 TU17 TZ07

Claims (5)

[Claims] A motor for driving an axle; an engine for driving the axle; an intermittent machine provided between the axle and the engine for switching between transmission and non-transmission of a driving force of the engine; A generator that starts the engine and generates power by the driving force of the engine, a battery that performs charging and discharging between the motor and the generator, and a booster that boosts voltage to charge the battery. A charge state detecting means for detecting a charge state of the battery when the booster starts a charging operation, wherein the charge state of the battery can start the engine by the generator. And a charge stopping means for stopping a charging operation of the booster based on a result of the judgment by the judging means. Charge control device of the lid electric car. 2. The charge control device for a hybrid electric vehicle according to claim 1, wherein the booster receives an electric power supplied from outside. 3. When the determining means determines that the state of charge of the battery has been restored to a state where the engine can be started,
3. The charge control device for a hybrid electric vehicle according to claim 1, further comprising a display unit for displaying that the engine can be started. 4. A control means for controlling the start and stop of the engine by supplying electric power from the battery to the generator based on a result of the determination by the determination means. The charge control device for a hybrid electric vehicle according to claim 1 or 2, wherein: 5. The control device according to claim 1, wherein when the start of the engine is completed, the generator is operated by the driving force of the engine to control the battery to be charged until the battery reaches a predetermined state of charge. The charge control device for a hybrid electric vehicle according to claim 4.