JPH0627504B2 - Engine energy recovery system - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to an engine energy recovery device that recovers exhaust energy of an engine as electric power.

(Prior Art) In recent years, an adiabatic internal combustion engine has been developed in which ceramics are used for each part of the internal combustion engine, for example, the outer wall of the exhaust manifold, the cylinder liner, the heat insulating plate of the cylinder head, the piston, and the like. According to this internal combustion engine, it is not necessary to radiate the heat generated therein to cool the internal combustion 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, there has been conventionally known a method in which the rotational force of a turbine rotated by exhaust gas is decelerated by a multistage gear mechanism and returned to a crankshaft.

Further, a proposal of a turbo compound engine in which an exhaust turbine having a generator is provided in an exhaust pipe of an engine and electric power from the generator is supplied to an electric motor provided on a rotating shaft of the engine to drive the engine is proposed in Japanese Patent Application No. 60-233935. No.

(Problems to be Solved by the Invention) In such a method of regenerating exhaust energy, the former method of returning the rotational force to the crankshaft by using the gear mechanism is, for example, usually one step in consideration of gear transmission efficiency. Since the efficiency is 0.9 to 0.95, the efficiency is reduced to about 80% in three stages of deceleration, the gear mechanism is complicated, and the cost is increased. In a small passenger car, the space of the engine room is small, which causes a problem in the location of the gear mechanism.

In the proposal of the latter turbo compound engine,
A generator is provided in each of the two-stage turbines of the turbocharger and the exhaust turbine, and the generated electric power is supplied to the electric motor provided on the rotating shaft of the engine to drive it. However, the method of controlling the voltage of the generator is mechanical operation. Since it is complicated by using the tap selector, there is a weak point in its maintenance and reliability, and there is a problem that concrete measures are not taken when combining the power of each generator and converting to AC output. .

The present invention has been made in view of the above problems, and an object thereof is to combine electric power of a generator provided in a two-stage turbine,
It is an object of the present invention to provide an energy recovery system for an engine, which uses a semiconductor to improve efficiency without using a mechanically operating means for frequency conversion.

(Means for Solving Problems) According to the present invention, an engine is installed in an exhaust turbine of a turbocharger in which a rotor of an alternator is attached to a rotary shaft connecting an exhaust turbine blade and a compressor blade for supercharging. The exhaust manifold is connected, and an exhaust turbine having an AC generator is further provided at the exhaust port of the exhaust turbine, and exchange means for exchanging the generated electric power from the AC generators with each other into direct current, and the exchanged direct current. An energy recovery apparatus for an engine is provided, which is provided with an inverter that converts a pulse current into a pulsating flow having the same frequency and a combining unit that adds and combines outputs from these inverters.

(Function) A two-stage turbine having a rotating electric machine and a generator is provided in the exhaust pipe of the engine, and the generated power from this is controlled by means for adding and combining the power using a semiconductor element, and thus approximates to a sine wave. There is an effect of obtaining the electric power waveform.

(Example) Next, the Example of this invention is described in detail using drawing.

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

In FIG. 1, an exhaust housing B1 of a turbocharger B is attached to an exhaust pipe A1 of an engine A, and a turbine blade B2 is driven by the energy of exhaust gas discharged from the engine A. Then, by driving a compressor blade B3 provided coaxially with the turbine blade B2, the generated compressed air is pressure-fed to the engine A via the suction pipe A2 to increase the supply pressure.

In addition, the turbine blade B2 and the compressor blade B
An AC machine C, which serves as a rotary electric machine, is provided between the AC machine C and the turbine generator 3. When the turbine blade B2 is driven by the energy of the exhaust gas, the AC machine C operates as a generator and the generated power is a rectifying element. Is transmitted to the rectification device D having

E is an exhaust turbine having a generator F, which is connected to the exhaust port of the exhaust housing B1 of the turbocharger B, and the blade E1 is driven by the residual energy after driving the turbine blade B2. Then, the generator F directly connected to the blade E1 is driven, and the generated power is transmitted to the rectifying device G having a rectifying element.

H and I are inverters, to which DC power is input respectively from the rectifiers D and G, and according to a command signal from a controller J described later, for example, a thyristor control device is used to set the input DC power to a predetermined value. It is converted into multiphase pulsating flow power of the frequency of.

Since the thyristor control device used for the inverter H handles electric power from the AC machine C that generates electricity by high-pressure exhaust energy, it has a larger capacity than the thyristor control device used for the inverter I.

K is an adder of electric power, which receives the pulsating electric power from the inverters H and I, synthesizes the inputted pulsating electric power in accordance with a command signal from the controller J, and transmits the combined electric power to the electric motor L. .

The electric motor L is an electric motor that transmits power to an output shaft (not shown) of the engine A, drive shafts of wheels driven by the engine A, and the like. Is configured. And
A rotation sensor L1 for detecting the number of rotations of the electric motor L is provided, and the detected signal is transmitted to the controller J.

The controller J is composed of a microcomputer,
When it receives a detection signal based on the rotation speed from a rotation sensor L1 provided in the electric motor L, it has an arithmetic unit, a memory, an input / output device, etc. And a command to convert to phase pulsating flow power. At the same time as the instruction, it issues a command signal to the adder K to synthesize a predetermined pulsating power from the inverters H and I.

FIG. 2 is an explanatory diagram showing an example of the combination of pulsating current power,
Figures (a) and (b) show the power of AC machine C system,
The figures (e) and (d) show the electric power of the generator F system, and the figure (c) shows the names of the combined electric powers thereof, and each shows one phase of the multiphase electric power.

Then, the power generated by the AC machine C is converted into DC by the rectifier D, converted into pulsating flow by the inverter H according to a command from the controller J (a), and a part of the polarity is reversed (b). ) It becomes like the figure.

In addition, the power generated from the generator F is converted into direct current by the rectifier G, and is converted into a pulsating flow having the same frequency as the pulsating flow shown in FIG.
When a part of the polarities is inverted, the result is as shown in FIG.

Then, it is shown that when the powers of both of the figures (b) and (d) are combined by the adder K, the AC power approximated to a sine waveform is obtained as shown in the figure (c).

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

Turbine blade B of turbocharger B is driven by the energy of exhaust gas discharged by the operation of engine A.
2 and the blade E1 of the exhaust turbine E are rotatably driven, an AC machine C and a generator F provided coaxially with each other.
Generates AC power. The generated power from the alternator C is converted into direct current by the rectifier D, and the generated power from the generator F is converted into direct current by the rectifier G.

Then, the electric power of the AC machine C, which has become a direct current, is converted into pulsating electric power as shown in FIG. 2 (a → b) by the control operation of the built-in thyristor by the inverter H which operates in response to the instruction of the controller J. To be converted. On the other hand, the electric power of the generator F, which has become a direct current, is supplied by a thyristor built in the inverter I which operates in response to a command from the controller J, as shown in FIG.
It is converted into alternating pulsating flow power as shown in d).

Then, these pulsating flow powers are guided to an adding device K that operates upon receiving a command from the controller J, are combined into AC power that approximates a sine waveform as shown in FIG. 2 (c), and are transmitted to the electric motor L.

During the above-mentioned DC → pulsation → combination exchange operation, the command signal from the controller J causes the inverters H and I and the adder K to constantly drive the electric motor L corresponding to the rotation signal of the rotation sensor L1. Since it is controlled, the electric motor L
Is controlled so that it always powers.

Therefore, when the electric motor L is provided on, for example, the drive shaft of the wheel or the output shaft of the engine A, the electric energy that regenerates the exhaust energy operates to enhance the running force of the vehicle.

Although the present invention has been described with reference to one embodiment, various modifications are possible within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

(Effect of the invention) The exhaust turbine of the engine of the present invention is provided with an AC generator in two stages, and the generated power from each AC generator is DC.
When converting to -AC, the frequency, voltage, etc. can be freely controlled by the inverter and added to each other, so that reliable energy recovery can be performed.

[Brief description of drawings]

FIG. 1 is a configuration block diagram showing an embodiment of an engine energy recovery apparatus according to the present invention, and FIG. 2 is an explanatory view showing an example of pulsating flow power synthesis. A ... Engine, A1 ... Exhaust pipe, B ... Turbocharger,
C ... Alternator, D ... Rectifier, E ... Exhaust turbine, F ... Generator, G ... Rectifier, H, I ... Inverter, K ... Adder.

Claims (1)

[Claims] 1. An exhaust manifold of an engine is connected to an exhaust turbine of a turbocharger in which a rotor of an AC generator is attached to a rotary shaft connecting an exhaust turbine blade and a compressor blade for supercharging, An exhaust turbine further having an AC generator at the exhaust port is provided, and exchange means for exchanging the generated electric power from the AC generators with each other into direct current, and an inverter for converting the exchanged direct current into a pulsating current of the same frequency. An energy recovery device for an engine, characterized by comprising a combining means for adding and combining outputs from these inverters.