JPH07107614A - Brake system for automobile and auxiliary power unit - Google Patents

Abstract

PURPOSE:To achieve an effect similar to warm-up operation by detecting the temperature of an internal-combustion engine and setting a power generation mode forcibly when the detected temperature is lower than a predetermined level thereby operating squirrel-cage polyphase induction machine as a generator and applying a load to the internal-combustion engine. CONSTITUTION:An internal-combustion engine 1 is provided with a temperature sensor 8 for detecting the temperature thereof and a control circuit 5 makes a decision whether the detected temperature is lower than a predetermined level. If it is lower than the predetermined level, power generating mode is set forcibly regardless of the necessity of charging and a squirrel-cage polyphase induction machine 2 is operated as a generator for driving the internal-combustion engine 1 thus charging a storage means 3. When the storage means 3 is charged sufficiently, power generation is effected intendedly with low efficiency through the control circuit 5. Furthermore, the control circuit 5 sets the power generating mode forcibly when a switch 10 is turned ON in order to operate a cooler 9. This constitution allows warm-up operation even if the internal-combustion engine is in cool state and the charging amount of the storage means is prevented from dropping abruptly during operation of a cooler.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention is used in a hybrid vehicle equipped with an internal combustion engine and an electric power unit. The present invention converts mechanical energy generated by braking of an automobile whose main power is an internal combustion engine into electrical energy and stores the electrical energy in a large power storage unit (secondary battery or electrostatic capacity) to accelerate the internal combustion engine. At times, the stored electrical energy is supplied to an auxiliary accelerating device for use in a device for generating mechanical energy.

The present invention relates to the international publication WO88 / 061.
No. 07 (International Application No. PCT / JP88 / 00157) relates to improvements in electric braking and auxiliary accelerators for automobiles. The invention is a device suitable for mounting on a motor vehicle with auxiliary acceleration and auxiliary braking devices sold by the applicant under the name HIMR.

[0003]

2. Description of the Related Art A rotating shaft of a squirrel cage polyphase induction machine is directly connected to a rotating shaft of an internal combustion engine, which is a main power source of an automobile, and the squirrel cage polyphase induction machine is set as an electric motor to be used as auxiliary power. There is known a device that operates as a brake by setting the squirrel cage polyphase induction machine as a generator. That is, when a squirrel-cage multi-phase induction machine is given a rotating magnetic field with a rotation speed exceeding the actual rotation speed of its rotor, the squirrel-cage poly-phase induction machine operates as an electric motor and generates a rotating magnetic field with a rotation speed below the actual rotation speed. When given, the squirrel cage polyphase induction machine operates as an electric motor. Then, a large DC storage battery (or electrostatic capacity) is installed in the car, and when the cage-type multi-phase induction machine operates as an electric motor, energy is taken from this storage cell and converted into AC to form a cage-type poly-phase induction machine. Supply,
An inverter circuit is provided for rectifying the output AC power of the squirrel-cage multi-phase induction machine and regenerating it to the storage battery when operating as a generator. This inverter circuit is controlled by a program control circuit which receives driving information, the rotation speed of the cage multi-phase induction machine, and other information.

The applicant of the present invention has developed such an automobile as a HIM.
It is manufactured and sold under the name of R, and it is continuously tested on vehicles such as regular buses for routes and vehicles running on mountain roads where environmental conservation is prioritized.

As a result of testing, many improvements have been made to the above-described device, and the mode in which the squirrel-cage polyphase induction machine is used as a generator has two modes, a regeneration mode and a power generation mode. It was That is, the regenerative mode is a mode in which the squirrel-cage polyphase induction machine is used as a generator to convert kinetic energy into electric energy to regeneratively charge the storage battery when the vehicle is braked and decelerated. The power generation mode uses the cage multi-phase induction machine as a generator for the storage battery when the vehicle is running steadily when the storage battery is low or when the vehicle is stopped and the internal combustion engine is idling. This is a mode for forcibly charging.

When the regenerative mode and the auxiliary acceleration mode are repeatedly and effectively used, the fuel consumption of the internal combustion engine can be reduced and economical operation can be performed. However, depending on the driving condition, if the auxiliary acceleration mode is used often and the regenerative mode is not used, the amount of electricity stored in the storage battery will gradually decrease. For this reason, when the amount of electricity stored in the storage battery falls below a certain limit, the power generation mode is automatically set to recover it, regardless of the operation, and when the vehicle is in steady running or when the vehicle is idling. In addition, the squirrel-cage multiphase induction machine is operated as a generator to charge the storage battery by the rotational energy of the internal combustion engine. Since this consumes fuel, the power generation mode should not be used as much as possible for economical operation.

The exhaust brake has been abolished in the above-mentioned device. Exhaust brakes have a structure in which a control valve is provided in the exhaust passage of an internal combustion engine, and when the engine brake is desired to be effective, this control valve is closed to keep the exhaust gas in the exhaust pipe line. ing. In the hybrid device as described above, the regenerative mode is set instead of the exhaust brake, and the energy generated during braking is converted into electric energy to be regenerated in the power storage means. Exhaust brakes that raise and consume engine temperature are no longer needed.

[0008]

Since the exhaust brake is eliminated, the warm-up operation at the time of cold temperature is inconvenient. That is, when the temperature of the internal combustion engine is to be raised quickly when the internal combustion engine is started at the cold temperature, a method of closing the control valve of the exhaust brake in the idling state of the internal combustion engine is used. In such a hybrid device as described above, such a warm-up operation is impossible because there is no exhaust brake control valve.

The present invention has been made against such a background, and an object thereof is to provide an apparatus capable of performing a warm-up operation at a cold temperature. Another object of the present invention is to provide a device that prevents the amount of electricity stored in the electricity storage means from being rapidly reduced when the cooling device is used.

[0010]

SUMMARY OF THE INVENTION According to the present invention, mechanical energy generated by braking of an automobile whose main power is an internal combustion engine is exchanged with electrical energy and stored in a large storage means.
The present invention relates to an improvement of a device that supplies electric energy stored when accelerating an internal combustion engine to an auxiliary accelerating device to generate mechanical energy, and is a cage multiphase induction machine connected to a rotary shaft of the internal combustion engine. A power storage means, an inverter circuit for bidirectionally converting and coupling electric energy between the multiphase AC circuit of the squirrel cage multiphase induction machine and the direct current circuit of the power storage means, and a control circuit for controlling the inverter circuit. The control circuit includes an auxiliary acceleration mode in which the squirrel-cage polyphase induction machine is an electric motor, a regeneration mode in which the squirrel-cage polyphase induction machine is used as a generator to charge the power storage means when the vehicle is braked, and Braking and assisting of an automobile having a power generation mode in which the squirrel-cage polyphase induction machine is used as a generator to charge the storage means by the driving force of an internal combustion engine when the storage amount of the storage means is insufficient. An apparatus, characterized a temperature sensor for detecting the temperature of the internal combustion engine, that the detection value of the temperature sensor and means for setting a forced power mode when it is less than a predetermined value.

It is desirable to include a cooling device to which an operating current is supplied from the power storage device, and to have a device for forcibly setting the power generation mode when the switch of the cooling device is in the ON state.

[0012]

The temperature sensor detects the temperature of the internal combustion engine, and when the detected value is below a predetermined value, the power generation mode is forcibly set. That is, when the temperature of the internal combustion engine is lower than the predetermined value regardless of whether charging is necessary or not, setting the power generation mode causes the squirrel-cage polyphase induction machine to function as a generator and the load on the internal combustion engine. Since the temperature rises earlier, the effect similar to that obtained by closing the exhaust brake valve and performing warm-up operation can be obtained.

[0013]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing the configuration of the embodiment of the present invention.

In the first embodiment of the present invention, a squirrel cage polyphase induction machine 2 connected to a rotary shaft of an internal combustion engine 1, a storage means 3, a squirrel cage polyphase induction machine 2 multiphase AC circuit and a storage means. An inverter circuit 4 for bidirectionally converting and coupling electric energy with the DC circuit 3 and a control circuit 5 for controlling the inverter circuit 4 are provided. The control circuit 5 is a squirrel cage multiphase induction machine 2
Acceleration mode in which the electric motor is used as a motor, a regeneration mode in which the electric power storage means 3 is charged by using the squirrel-cage polyphase induction machine 2 as a generator when the vehicle is braked, and a squirrel-cage polyphase induction machine when the storage amount of the electric power storage means 3 is insufficient A power generation mode in which the power storage means 3 is charged by the driving force of the internal combustion engine 1 using 2 as a generator, and a feature of the present invention is that a temperature sensor 8 for detecting the temperature of the internal combustion engine 1 is provided, and the control circuit 5 includes the temperature sensor 8. It includes means for forcibly setting the power generation mode when the detection value of the temperature sensor 8 is equal to or lower than a predetermined value. Further, the cooling device 9 to which an operating current is supplied from the power storage means 3 is provided, and the cooling device 9 is provided in the control circuit 5.
Means for forcibly setting the power generation mode when the switch 10 is turned on. As the power storage unit 3, a secondary battery, more specifically, a lead storage battery is used in this embodiment.

A rotation sensor 6 is attached to the internal combustion engine 1, and a signal from the rotation sensor 6 is given to the control circuit 5. A capacitor 7 is connected to the output side of the inverter circuit 4, and a detection circuit 13 that detects the output voltage of the inverter circuit 4 is connected to the storage means 3.

Next, the operation of the embodiment of the present invention thus constructed will be described.

In the normal operation, in the auxiliary acceleration mode, the control circuit 5 controls the inverter circuit 4 to give the cage multiphase induction machine 2 a rotating magnetic field having a rotation speed exceeding the actual rotation speed of the rotor, The multi-phase induction machine 2 is operated as an electric motor to provide auxiliary power to the internal combustion engine 1. In the regenerative mode, when the vehicle is braking and decelerating,
Is used as a generator to convert kinetic energy into electric energy and regeneratively charge the storage means 3. In the power generation mode,
The squirrel-cage multi-phase induction machine 2 is used as a generator when the vehicle is stationary and the vehicle is stationary or when the internal combustion engine 1 is in the idling state. 3 is forcibly charged. The shortage of the amount of stored electricity is determined by the terminal voltage of the storage means 3 in a state where a load is connected to the storage means 3.

The feature of the present invention is to eliminate the inconvenience that the warm-up operation at the cold temperature cannot be performed because the exhaust brake is abolished in the hybrid apparatus performing such operation. In the operation, as shown in FIG. 2, the temperature sensor 8 provided in the internal combustion engine 1 detects the temperature, and the control circuit 5 takes in the detected value and determines whether or not it is equal to or lower than a predetermined value. When it is less than or equal to a predetermined value, the power generation mode is forcibly set regardless of whether or not charging is necessary, and the squirrel cage multiphase induction machine 2 is used as a generator to drive the power storage means 3 by the driving force of the internal combustion engine 1. Charge it. By this charging operation, a load is applied to the internal combustion engine 1, and the warm-up operation is performed in a short time.

When the power storage means 3 is sufficiently charged, the amount of power generation is small even if the power generation mode is forcibly set. In such a state, the control circuit 5 controls the slip of the rotor and the rotating magnetic field of the squirrel cage multiphase induction machine 2 so as to be in a non-optimal state, and intentionally causes inefficient power generation. As a result, when the temperature of the internal combustion engine 1 rises and exceeds a predetermined value, the power generation mode is canceled and the normal control is resumed.

When the cooling device 9 is provided, an operating current is supplied to the cooling device 9 from the power storage means 3. FIG. 3 is a flow chart showing the flow of operations of the control circuit in the embodiment of the present invention when the cooling device is activated. When the switch 10 is turned on to operate the cooling device 9, the control circuit 5 forcibly sets the power generation mode.
By setting this power generation mode, a rapid decrease in the amount of electricity stored in the electricity storage means 3 due to the activation of the cooling device 9 is prevented. When the predetermined charge amount is maintained, the power generation mode is released and the normal control is resumed.

[0021]

As described above, according to the present invention, the warm-up operation can be performed even when the internal combustion engine is in the cold state without the exhaust brake valve. Further, there is an effect that it is possible to prevent a rapid decrease in the charge amount of the power storage means when the cooling device is used.

[Brief description of drawings]

FIG. 1 is a block diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a flowchart showing a flow of a warm-up operation of the control circuit according to the embodiment of the present invention.

FIG. 3 is a flowchart showing an operation flow of the control circuit according to the embodiment of the present invention when the cooling device is activated.

[Explanation of symbols]

 1 Internal Combustion Engine 2 Cage Type Multi-Phase Induction Machine 3 Storage Unit 4 Inverter Circuit 5 Control Circuit 6 Rotation Sensor 7 Capacitor 8 Temperature Sensor 9 Air Conditioner 10 Switch 13 Detection Circuit

Claims (2)

[Claims] 1. A squirrel-cage polyphase induction machine connected to a rotary shaft of an internal combustion engine, a power storage means, a multi-phase AC circuit of the squirrel-cage polyphase induction machine, and a DC circuit of the power storage means in both directions. An inverter circuit for converting and coupling electric energy and a control circuit for controlling this inverter circuit are provided. This control circuit is used in an auxiliary acceleration mode in which the squirrel cage polyphase induction machine is used as an electric motor, and when the car is being braked. Regenerative mode in which the electric storage means is charged by using the electric multi-phase induction machine as a generator, and when the electric storage amount of the electric storage means is insufficient, the electric power storage means is driven by the driving force of the internal combustion engine using the cage multi-phase induction machine as the electric generator. In a vehicle braking and auxiliary power unit equipped with a power generation mode for charging the battery, a temperature sensor that detects the temperature of the internal combustion engine and a power generation mode that is compulsorily generated when the detected value of this temperature sensor is below a predetermined value. Braking and auxiliary power unit of a motor vehicle, characterized in that it comprises a means for setting the mode. 2. The vehicle according to claim 1, further comprising a cooling device to which an operating current is supplied from the power storage device, and means for forcibly setting a power generation mode when a switch of the cooling device is in an on state. Braking and auxiliary power units.