JPH0423092B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine energy recovery device that regenerates engine exhaust energy into electric power and supplies it to an electric motor to assist the driving force of a vehicle.

(Prior Art) In recent years, heat-insulating internal combustion engines have been developed that use ceramics for various parts of the engine, such as the outer wall of the exhaust manifold, the cylinder liner, the cylinder head insulation plate, and the piston. According to this internal combustion engine, there is no need to cool the internal combustion engine by dissipating the heat generated inside the engine, and the energy of the generated high temperature exhaust gas is regenerated and returned to the output shaft of the internal combustion engine. It can be used to improve the output of the engine.

As this type of exhaust energy regeneration method, a method is known in which the rotational force of a turbine rotated by exhaust gas is decelerated by a multi-stage gear mechanism and then returned to the crankshaft.

In addition, a patent application filed in 1983 proposed a turbo compound engine in which an exhaust turbine with a generator is installed in the exhaust pipe of the engine, and power from the generator is supplied to drive an electric motor installed on the rotating shaft of the engine.
No. 233935.

(Problem to be Solved by the Invention) In such a method of regenerating exhaust energy, the former method of returning rotational force to the crankshaft using a gear mechanism is usually one-stage, for example, considering the transmission efficiency of the gear. Its efficiency is 0.9 to 0.95, so with three-stage reduction, the efficiency decreases to about 80%,
Moreover, the gear mechanism becomes complicated and its cost increases. In addition, since the space in the engine compartment of a small passenger car is narrow, a problem arises in the installation location of the gear mechanism.

In the latter proposal for a turbo compound engine, two components are used: a turbocharger and an exhaust turbine.
A generator is installed in each stage turbine, and the generated power is supplied to the motor installed on the rotating shaft of the engine to drive it, but the method of controlling the voltage of the generator is complicated because it uses a mechanically operated tap selector. Therefore, it has weaknesses in its maintenance and reliability, and there is also a problem in that it lacks concrete measures when combining the power of each generator and converting it to AC output.

The present invention was made in view of the above-mentioned problems, and its purpose is to supply the output of a generator installed in a two-stage turbine to two systems of windings installed in an electric motor that assists the driving force of an engine. An object of the present invention is to provide an engine energy recovery device that improves the efficiency of electric power generated by regenerating exhaust energy.

(Means for Solving Problems) According to the present invention, a high-pressure exhaust turbine and a low-pressure exhaust turbine each having a generator are connected in series to the exhaust pipe of the engine, and a An energy recovery device for an engine, characterized in that an electric motor having two winding systems serving as a means for assisting the driving force is attached, and each output from the generator is supplied to each of the two winding systems. is provided.

(Function) In the present invention, two systems of windings are provided in the generator that assists the driving force of the engine, and each output from the generator is supplied to these windings to drive the electric motor, so exhaust energy is regenerated. It has the effect of efficiently assisting the engine's driving force with electricity.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram showing an embodiment of an engine energy recovery device according to the present invention.

In FIG. 1, an exhaust housing B1 of a high-pressure exhaust turbine B is attached to an exhaust pipe A1 of an engine A, and the turbine blade B2 is
to drive.

Further, a generator C is provided on the rotating shaft of the turbine blade B2, and when the turbine blade B2 is driven by the energy of the exhaust gas, the generator C
The power from is transmitted to a rectifier D having a rectifier element.

E is a low-pressure exhaust turbine having a generator F, which is connected to the exhaust port of the exhaust housing B1 of the exhaust turbine B, and the blade E1 is driven by the energy of the low-pressure exhaust gas after driving the turbine blade B2. . Then, a generator F directly connected to the blade E1 is driven, and the generated power is transmitted to a rectifier G having a rectifier element.

H and I are inverters, to which DC power is input from rectifiers D and G, respectively;
In response to a command signal from a controller J, which will be described later, input DC power is converted into polyphase AC power at a predetermined frequency using, for example, a thyristor control device.

The thyristor control device used in the inverter H has a larger capacity than the thyristor control device used in the inverter I because it handles electric power from the generator C generated by high-pressure exhaust energy.

K is an electric motor that transmits power to the output shaft (not shown) of engine A, the drive shaft of the wheels driven by engine A as the motive force, and when electric power is supplied to drive electric motor K, ,
It is configured to assist the running force of the vehicle.

FIG. 2 is an explanatory diagram showing an example of the stator winding of the electric motor K. FIG. 2a shows an example of a method of winding the stator core, and FIG. 2b shows an enlarged cross section thereof.

The stator core 1 is made of a magnetic material, has a plurality of convex poles 11 arranged at equal intervals in the direction of the central axis of the rotor (not shown), and is wound with two different types of stator windings 21 and 22. It's being passed around.

The stator winding 21 uses a conductor with a larger cross-sectional area than the stator winding 22, and serves as a load that matches the output characteristics of the generator C. The load is set to match the output characteristics of the When alternating current is supplied to both, a rotating magnetic field is generated in the stator core 1.
For example, lap windings are used.

Further, the electric motor K is provided with a rotation sensor L that detects the rotation speed of the rotating shaft, and transmits the detected rotation signal to the controller J.

The controller J is composed of a microcomputer and has an arithmetic unit, a memory, an input/output device, etc., and a rotation sensor L provided on the electric motor K.
When receiving the rotation signal from the inverter H, I
It is configured to transmit a command signal to be converted into AC power of a predetermined frequency and phase for powering the electric motor K.

Next, the operation of this embodiment configured as described above will be explained.

When the turbine blades B2 of the exhaust turbine B and the blades E1 of the exhaust turbine E are rotationally driven by the energy of the exhaust gas discharged by the operation of the engine A, the generator C installed on the same axis rotates. Generator F generates AC power.
The power generated by the generator C is then converted into direct current by the rectifier D and transmitted to the inverter H. Furthermore, the power generated by the generator F is converted into direct current by the rectifier G and transmitted to the inverter I.

On the other hand, a rotation signal that detects the rotation speed of the electric motor K is inputted to the controller J from a rotation sensor L provided on the electric motor K, and the controller J converts it into AC power to power the electric motor K based on this rotation signal. The command signal to inverter H and I
Send to.

Therefore, inverters H and I convert the direct current input from rectifiers D and G into alternating current of a predetermined frequency and phase for powering electric motor K. The output from the inverter H is sent to the stator winding 21 of the motor K, and the output from the inverter I is sent to the stator winding 2.
2 respectively to power the electric motor K.

Therefore, the electric motor K, which is connected to the output shaft of the engine A or the drive shaft of the wheels to transmit power, performs power running, so that the running force of the vehicle is assisted.

Although the present invention has been described by way of one embodiment, various modifications can be made within the scope of the gist of the present invention.
These are not excluded from the scope of the present invention.

(Effects of the Invention) According to the present invention, two systems of windings with different characteristics are provided in the electric motor that assists the driving force of the engine, and a power generator is provided in the high-pressure exhaust turbine and a power generator is provided in the low-pressure exhaust turbine. A gear mechanism is used because the output from the machine is supplied to the winding of the load that matches each output characteristic and then to the motor, and the motor is powered by being controlled by the rotation signal from the rotation sensor. There is an effect that the engine driving force can be efficiently assisted by the electric power regenerated from the exhaust energy of the engine without using any mechanical mechanism.

[Brief explanation of drawings]

FIG. 1 is a structural block diagram showing an embodiment of an engine energy recovery device according to the present invention, and FIG. 2 is an explanatory diagram showing an example of a stator winding of an electric motor. A...engine, A1...exhaust pipe, B...exhaust turbine, C...generator, E...exhaust turbine,
F... Generator, K... Electric motor, L... Rotation sensor, 21... Stator winding, 22... Stator winding.

Claims (1)

[Scope of Claims] 1. A high-pressure exhaust turbine and a low-pressure exhaust turbine each having a generator are sequentially provided in series in the exhaust pipe of the engine, and serve as a means for assisting the driving force of the engine's drive shaft.2 What is claimed is: 1. An energy recovery device for an engine, characterized in that an electric motor is provided with a winding system, and each output from each of the generators is supplied to two winding systems of the electric motor. 2. A patent claim characterized in that the electric motor is provided with a rotation sensor that detects the number of rotations, and a controller that controls the respective outputs from the generators by inputting a detection signal from the rotation sensor. An energy recovery device for an engine according to item 1.