JPS6293424A - Energy recovery equipment for turbo-compound engine - Google Patents

Abstract

PURPOSE:To enable the energy of exhaust gas to be recovered efficiently by providing an exhaust gas turbine provided with an generator on the exhaust system of an engine, and then directly connecting a motor with an axle shaft so that the motor is driven with the generated output of said generator in response to the rotational speed of the axle shaft. CONSTITUTION:To the exhaust manifold 2 of an engine 1 is connected an exhaust gas turbine 3 provided with a generator 4, and at the same time, to an axle shaft 10 is directly connected an A.C. motor 9. And then, the generated output of the generator 4 is supplied through a convertor 7 to said motor 9. The output frequency of the convertor 7 is controlled in response to signals from a load sensor 6 and an axle shaft rotational speed sensor 8 which are provided on an fuel injection pump 5. Hereby, the energy of exhaust gas can be recovered efficiently without the use of a gearing mechanism for a motor.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention utilizes an exhaust bin that can regenerate the repellent energy of an internal combustion engine. Regarding the energy recovery device of Compound 1-Passin,
In particular, the present invention relates to an energy recovery device for a turbo compound engine that uses the output of a generator driven by exhaust energy F- to rotate an electric motor provided on an axle to regenerate energy.

(Prior Art) In recent years, heat-insulating internal combustion engines have been developed in which ceramics are used for various parts of the internal combustion engine, such as the outer wall of the exhaust manifold, the cylinder liner 7, the cylinder head heat insulating plate, and the piston. According to this internal combustion engine, there is no need to dissipate the heat generated inside 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. internal combustion 11!1 rJ tf
It can be used for directing force.

In this type, the exhaust energy regeneration force f1 is conventionally rotated by the exhaust gas, i, and the rotational force of the turbine is transferred to a multi-stage gear mechanism to reduce the speed by 1. −("fusa")
・I returned to the evening at 11.
Hi; 35, also, 1j energy is accompanied! :Okitoshiichi τ, 14 opening/closing 59-141713 In the official publication, the tA air 6λ-bin with the exchanger 1 engine is aired, f) the -J-2 torque 1'--. The output of the alternator drives an induction motor 17 provided on the output shaft of the internal combustion engine to regenerate exhaust energy, and a stage 1L for determining the magnitude of the load on the internal combustion engine is provided to control the intake jt. A plan has been devised to control the exhaust gas temperature and raise the exhaust gas temperature when the load is small.

(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, for example, not commonly used, considering the transmission efficiency of floats. Since the efficiency is 0.9 to 0.95, the efficiency decreases to about 80% with three-stage reduction, and the tooth 1j 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. The latter proposal for an exhaust energy regeneration device is
#The energy of the air gas is used to first control the AC power to drive the induction motor and rotate the output shaft of the internal combustion engine, so the gear mechanism is not relied on and the intake air is controlled depending on the load of the internal combustion engine. However, there is room for improvement in terms of the efficiency of exhaust energy recovery.

The present invention has been made in view of these points, and its purpose is to convert exhaust energy into electrical energy using an alternator without using a gear mechanism, and to efficiently drive an axle with the electrical energy. An object of the present invention is to provide an energy recovery device for a turbo compound engine that is supplied to an electric motor and has a high exhaust energy recovery effect.

(Means for Solving the Problem) The energy recovery device for a turbo compound engine of the present invention is an internal combustion engine with a combustion chamber, an exhaust pipe, etc. having an insulated structure. The energy recovery device for a compound engine includes 15 detection stages for detecting the rotational speed of an axle driven by the internal combustion engine, and an AC motor provided on the axle.
and means for supplying electric power to the AC motor according to the rotational speed of the axle.

(Function) In the recovery device of the present invention, the generator provided in the exhaust turbine driven by the energy of the gas is converted into electrical energy whose frequency is controlled by the detection signal of the rotation speed of the axle, and drives the axle. Since the electric motor is activated to assist the rotational force of the wheels, the energy becomes exhaust energy → electric energy → small wheel driving force, and it functions as a highly efficient energy recovery device.

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

FIG. 1 is a configuration explanatory diagram showing one embodiment of an engine energy recovery device according to the present invention, and FIG. 2 is a partial configuration diagram showing a partially modified configuration.

In FIG. 1, 1 is an engine, with pistons la,
A combustion chamber such as a cylinder litchi 1b and an exhaust boat lc constitute a heat insulating structure made of ceramics, and an exhaust turbine 3 equipped with an AC generator ``rrf'' and a generator 4 is attached to an exhaust manifold 2.

The rotating shaft of an alternator 4 is directly attached to the rotating shaft of the exhaust turbine 3, and when the turbine blades 3a are driven by the high temperature exhaust gas discharged from the exhaust manifold 2, the alternating current power R4 is high. Generates alternating current power at a frequency. Note that 5 is an injection pump that injects fuel into the engine 1, and a load sensor 6 that detects the amount of fuel injected by the injection pump 5 and generates a load signal FS is attached. Reference numeral 7 denotes a converter, which is constituted by, for example, a cycloconverter, and when AC power with a higher frequency than the AC generator 4 is input, it efficiently converts it into AC power with a lower frequency and outputs it. 2, this frequency conversion operation is performed by the rotation axis V from the rotation sensor 8 that detects the rotation speed of the axle;
WS etc. are controlled by the load signal FS from the load sensor 6.

Reference numeral 9 denotes an electric motor having a rotating shaft coaxial with the llj axis 10, and is supplied with AC power output from the converter 7 (Jt) to drive the wheels 11. The frequency of the output is always the rotation axis qW
The frequency is controlled by S and the load signal FSNO, and is output from the converter 7 at a frequency that drives the electric motor 9. Therefore, the Ijj wheels 11 are always driven by the rotational force of the electric motor 9, regardless of their rotational speed.

In FIG. 2, 12 is a rectifier, and 13 is an inverter. The output of the alternating current generator 4 shown in FIG. Control is performed using a rotation signal WS from a rotation sensor 8 that detects the rotation speed of the axle and a load signal FS from the load sensor 6. After converting the AC power into alternating current power at a predetermined frequency, the electric motor 9 is driven.

Next, the operation of this embodiment having such a configuration will be explained.

High-temperature air gas from the engine 1, which has a heat-insulating structure, is guided to an exhaust turbine 3 via an exhaust manifold 2, and drives an alternator 4 directly connected to turbine blades 3a. Then, the AC power generated by the AC power generation Ja4 is input to the converter 7.

The converter 7 receives the load signal FS from the load sensor 6 and the rotation signal from the rotation sensor 8 of the axle 10, and changes the high frequency of the power generated by the alternator 4 in response to these signals. As mentioned above, the electric motor 9 is driven by converting it into low frequency AC power that is supplied to the electric motor 9. Therefore, regardless of the rotational speed of the axle 10, the electric motor 9 always operates to drive the axle 10 and drive the wheels 11.
This will assist in the rotational force of.

Also, in the configuration shown in FIG. 2, the alternator 4 converts exhaust energy into electrical energy, and this electrical energy drives the electric motor 9 in accordance with the rotational speed of the axle 10 to drive the wheels 1j. The operation is similar to that of FIG.

However, when the rectifier 12 and inverter 13 are inserted into the electrical energy delivery path, the losses in these electrical devices are weighted, so the overall efficiency of exhaust energy recovery is equal to that of the configuration shown in Figure 1. In comparison, the viewing efficiency inevitably decreases.

As mentioned above, the present invention has been explained using the embodiments 1-1, but various modifications can be made within the scope of 1-1 of the present invention, and these are not excluded from the scope of the present invention. .

(Effects of the Invention) As described in detail below, the present invention leads IA gas from an engine having a heat insulating structure to an exhaust turbine to drive an alternator, converting exhaust energy into electrical energy. The frequency of the AC power converted by the converter is controlled by the rotation signal of the 6 axles input to the converter and the load signal, and the AC power is always at a frequency that keeps the motor running, so there is no need for a gear mechanism. , it is possible to obtain an exhaust energy recovery device that is also very efficient in the delivery of electrical energy.

In addition, the rotation speed of the exhaust turbine is unrelated to the rotation speed of the drive shaft, which is the engine load, so the rotation of the exhaust turbine can be maintained to maximize turbine efficiency.
Energy recovery efficiency can also be maintained at a high level.

In addition, in recovering exhaust energy, the present invention reduces the number of phases used in the energy delivery path, so there is less energy loss, and furthermore, the reliability of the parts used is improved and maintenance costs are reduced. Effects can be obtained.

[Brief explanation of drawings]

FIG. 1 is a structural diagram showing an embodiment of an engine exhaust energy recovery device according to the present invention, and FIG. 2 is a partial structural diagram showing a partially modified structure. DESCRIPTION OF SYMBOLS 1...Engine, 1a...Piston, 1b...Cylinder liner, 3...Exhaust valve, 48...
AC generator, 6... Load sensor, 7... Converter, 8... Rotation sensor, 9... Electric motor, 10... Car @ A11... Wheels. Patent Applicant: Isu (Jidosha Co., Ltd. Agent, Patent Attorney: Minoru Tsuji - Procedures: -jE (spontaneous) January 16, 1985 Patent Application No. 233939 2, Title of Invention: Turbo compound engine energy recovery device 3,
Relationship with the case of the person making the amendment Patent applicant address: 6-22-10 Inui, Tokyo Parts Industry Ward Name: Izuy Autochu Co., Ltd. Tobyama Kazuo Representative: Tobide-male 4, agent Address 〒1 Former Chiyo, Tokyo [3-146 Kanda Koyocho, 1st Ward]
, li' Detailed Description of the Invention J of the specification to be amended, Drawing (1) Specification, "generally general" in page 1, page 3, line 11, line 11 is amended to "generally one stage". (2) Amend "1 directly missing" in the second line of page 6 of the specification to "J" by directly connecting it to "J". (3) “From AC generator 4” on page 6, line 10 of Seiwa
is corrected to "from the alternator". (4) Amend Figure 1 of the drawing as shown in the attached sheet.

Claims (1)

[Claims] In an energy recovery device for a turbo compound engine, which has an exhaust turbine with a generator in the exhaust pipe of an internal combustion engine whose combustion chamber, exhaust pipe, etc. have a heat-insulating structure, detection detects the rotational speed of an axle driven by the internal combustion engine. 1. An energy recovery device for a turbo compound engine, comprising: an AC motor provided on the axle, and a means for supplying electric power to the AC motor according to the rotational speed of the axle.