JPH06117275A - Acceleration of generator driving engine - Google Patents

Abstract

PURPOSE:To increase the number of revolutions of an engine speedily without increasing unburnt gas or nitrogen oxides and the like in exhaust gas in a device to drive a generator by the engine. CONSTITUTION:Electric power generated by a generator G driven by a gas turbine engine E is stored once in a battery B, and a vehicle V is made to travel by output of a motor M driven by this battery B. When the engine E is accelerated, the generator G is driven temporarily by the battery B, and is made to function as a motor, and the engine E is assisted by the output, and the engine E is accelerated speedily. When acceleration of the engine E is finished, the generator G is made to carry out an original power generating function. Since there is no need to increase a fuel supply quantity sharply when the engine E is accelerated, an increase of unburnt gas or nitrogen oxides and the like in exhaust gas can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for accelerating a generator driving engine for accelerating an engine connected to a generator that can be used both as a power generating means and a driving means.

[0002]

2. Description of the Related Art Conventionally, as one form of an electric vehicle, a so-called hybrid vehicle is known in which an engine drives a generator to generate electric power, and the electric power drives a traveling motor to travel. In such a hybrid vehicle, acceleration of the engine in the idling state to the rated load state is
This is done by increasing the fuel supply to the engine.

[0003]

However, even if the fuel supply amount to the engine is increased, the rotational speed of the engine does not immediately increase due to the inertial mass of the rotating portion, and the response is delayed. In particular, when a gas turbine engine is used, even if the amount of combustion gas generated in the combustor is increased by increasing the fuel supply amount, the energy of the combustion gas is In addition to being wasted, there is a possibility that unburned gas, nitrogen oxides, etc. in the exhaust gas will increase due to a rapid increase in the fuel supply amount.

The present invention has been made in view of the above circumstances, and an object thereof is to accelerate a generator driving engine quickly and efficiently without deteriorating exhaust gas characteristics.

[0005]

In order to achieve the above object, the present invention provides a generator driving engine for accelerating an engine connected to a generator that can be used both as a power generating means and a driving means. The method of accelerating the method described above, characterized in that the generator is made to function as a drive means when the engine is accelerated to assist the acceleration of the engine, and the generator is made to function as the power generation means after the acceleration of the engine is completed.

[0006]

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

1 and 2 show an embodiment of the present invention. FIG. 1 is an overall configuration diagram of a hybrid vehicle, and FIG. 2 is a time chart showing control contents of an engine and a generator.

As shown in FIG. 1, a vehicle V is a four-wheeled vehicle having a pair of left and right front wheels Wf as steered wheels and a pair of left and right rear wheels Wr as driving wheels, and a gas turbine as a driving power source. Equipped with engine E. A generator G is connected to the gas turbine engine E, and a part of the electric power generated by the generator G is stored in a battery B composed of a rechargeable secondary battery. The driving force of the motor M that is rotated by receiving the electric power supplied from the generator G and the battery B is transmitted to the rear wheels Wr to drive the vehicle V. The gas turbine engine E, the generator G, and the motor M are connected to and controlled by the electronic control unit ECU. The generator G can be used as both a generator and a motor, and functions as a generator when a generator feed current is supplied based on a command from the electronic control unit ECU, and as a motor when a motor feed current is supplied. You can

In the figure, a gas turbine engine E and a generator G are shown.
And a solid line connecting the motor M and the rear wheel Wr represent a mechanical energy transfer path, a broken line connecting the battery B to the generator G and the motor M represents an electrical energy transfer path, and an electronic control unit. A chain line connecting the ECU with the gas turbine engine E, the generator G, and the motor M represents a control signal transmission path.

When the energy generated by the gas turbine engine E is larger than the energy required to drive the vehicle V, the battery B is charged by the surplus of the power generated by the generator G, and conversely, the gas turbine. When the energy generated by the engine E is smaller than the energy required for the vehicle V to travel, the shortage of the electric power generated by the generator G is discharged from the battery B to the motor M. By once converting the mechanical energy output from the gas turbine engine E into electrical energy in this manner, frequent changes in the rotational speed of the gas turbine engine E are avoided to improve fuel efficiency and reduce the exhaust gas. Unburned gas and nitrogen oxides can be reduced.

The acceleration from the idling state to the rated load state of the gas turbine engine E is performed by increasing the fuel supply amount to the gas turbine engine E, but the number of revolutions is increased by the inertial mass of the rotating part of the turbine or the like. There is a time lag in the rise of. On the other hand, the amount of combustion gas generated in the combustor immediately increases as the fuel supply increases, so the energy of the combustion gas is wastefully consumed until the rotational speed of the rotating part such as the turbine rises sufficiently. Moreover, since the mixture concentration is deviated to the rich side due to the increase in the fuel supply amount, there is a problem that unburned gas, nitrogen oxides, etc. in the exhaust gas increase.

Therefore, in the present invention, the control is performed according to the procedure shown in the time chart of FIG. 2 to improve the responsiveness during acceleration operation of the gas turbine engine E and to carry out unburned gas, nitrogen oxides, etc. in the exhaust gas. Is increased.

That is, in order to accelerate the idling gas turbine engine E to the rated load state in the region a, the motor feed current supplied to the generator G is linearly increased in the region b to drive the generator G to the motor. By assisting the gas turbine engine E with the output torque, the rotational speed of the gas turbine engine E is increased to the rated rotational speed at once. When the rotation speed of the gas turbine engine E rises to the rated rotation speed, the assist is ended by linearly decreasing the motor feed current to zero in the c region. Subsequently, the generator feed current supplied to the generator G in the d region is linearly increased to start power generation which is the original function of the generator G, and the generator feed current is kept constant in the e region to the generator G. The rated power is generated.

Since the fuel supply amount to the gas turbine engine E gradually increases over the regions b, c and d, excessive enrichment of the concentration of the air-fuel mixture supplied to the combustor is avoided, whereby exhaust gas is exhausted. The increase of unburned gas and nitrogen oxides inside is prevented. Moreover, since the generator G functions as a motor to assist the increase of the rotation speed of the gas turbine engine E, the rotation speed of the gas turbine engine E is changed from the idling state to the rated load state within the extremely short time in the region b. It can be raised quickly and its responsiveness can be improved.

Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the above embodiment, and various small design changes can be made.

For example, although the hybrid vehicle is illustrated in the embodiment, the present invention can be applied to any other application as long as the engine drives the generator. Also,
The engine is not limited to the gas turbine engine and may be another engine such as a gasoline engine.

[0017]

As described above, according to the present invention, when accelerating an engine connected to a generator, the generator is made to function as a driving means of the engine to assist the acceleration of the engine. Therefore, the engine can be accelerated quickly in a short time. Moreover, since it is not necessary to greatly increase the fuel supply amount when the engine is accelerated, it is possible to prevent an increase in unburned gas, nitrogen oxides, etc. in the exhaust gas.

[Brief description of drawings]

FIG. 1 is an overall configuration diagram of a hybrid vehicle

FIG. 2 is a time chart showing the control contents of the engine and the generator.

[Explanation of symbols]

 E Gas turbine engine (engine) G Generator

Claims (1)

[Claims] 1. A method for accelerating a generator driving engine for accelerating an engine (E) connected to a generator (G) that can be used as either a power generating means or a driving means, the engine (E ) Assisting the acceleration of the engine (E) by causing the generator (G) to function as a driving means during acceleration, and causing the generator (G) to function as a generating means after the acceleration of the engine (E) ends. Characterized by,
Method of accelerating generator driving engine.