JPH04349038A - Device for collecting energy of adiabatic engine and car driving device - Google Patents

Abstract

PURPOSE:To collect the gas energy exhausted from an adiabatic engine effectively at all times and use as the car driving force by converting the gas energy into electric power. CONSTITUTION:A power generator 3 is mounted on the rotary shaft of a turbo- charger 2 installed on an engine 1 of adiabatic structure, and the power from this generator 3 is converted into DC power by a power converter 4, and the resultant is used for charging a battery 5 or feeding power to motors 71-74 in direct coupling with wheels through a power controller 6. When this engine 1 is operated, it is put in a specified high-load condition, and at the peak with the load, the regenerative electric power given by the power converter 4 and/or the electric power charged on the battery 5 are fed to the motors so as to respond to the load.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an energy recovery system for an adiabatic engine and a vehicle drive system that recovers thermal energy of an adiabatic engine whose combustion chamber has a heat insulating structure and drives a vehicle using the recovered energy.

0002

[Prior Art] A heat insulating material is used in the combustion chamber and related parts of an internal combustion engine, and the exhaust energy of the so-called adiabatic engine is maintained at a high temperature without using a cooling mechanism, and the exhaust energy is recovered to increase the driving torque of the vehicle. Conventionally, high-temperature exhaust gas is guided to a turbine generator, etc., the thermal energy is recovered as electricity, and the recovered electricity is supplied to an electric motor connected to the crankshaft to power it, increasing engine output. Energy recovery systems are used.

0003

[Problem to be Solved by the Invention] In the exhaust energy recovery system for an adiabatic engine as described above, when the engine is under high load, the exhaust gas temperature is high and the recovery efficiency is good as shown in FIG. At times, the exhaust gas temperature decreases and the recovery efficiency decreases. When a vehicle is running normally, the engine load fluctuates over time as shown in Figure 7, so the average over all driving includes areas where exhaust energy cannot be recovered, as shown in Figure 8. Efficiency will be reduced.

The present invention was made in view of these problems, and its purpose is to improve the energy recovery efficiency of an adiabatic engine by operating the engine so that the load is always high. and to provide vehicle drive systems.

[0005]

[Means for Solving the Problems] In order to achieve the above-mentioned objects, the present invention provides a power storage means for storing power from an energy conversion means, and a power storage means for receiving power from the energy conversion means and the power storage means. Energy recovery and vehicle drive system for an adiabatic engine, comprising a wheel drive means that operates, and an operation control means that operates the adiabatic engine to a predetermined high load state and operates the wheel drive means when the vehicle load exceeds the engine load. is provided.

[0006]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is an explanatory diagram showing an embodiment of an energy recovery and vehicle drive system for an adiabatic engine according to the present invention, and FIG. 2 is a block diagram showing an example of its configuration.

[0008] In these drawings, 1 is an engine;
For example, this is a so-called adiabatic engine, in which the combustion chamber is insulated by using heat-resistant heat insulating materials in the cylinder liner, piston head, intake and exhaust valves, exhaust flow path, etc. Exhaust gas is discharged while maintaining a high temperature. is guided to the turbocharger 2 via the exhaust pipe 11, and the turbine 21 is driven by its energy. The compressor 22 directly connected to the turbine shaft is driven to rotate, and the compressed air is force-fed to the engine 1 through the intake pipe 12, thereby increasing the engine torque.

3 is a generator attached to the turbine shaft;
The exhaust energy is recovered as electricity, and the generated AC power is converted to DC by a power converter 4, used to charge a battery 5, and is controlled by a power controller 6 and directly connected to each of the four wheels 7. motors 71, 72
, 73 and 74 are electrically connected.

A controller 8 is composed of a microcomputer, and is equipped with a central control unit, various memories, input/output circuits, etc. The input circuit includes an accelerator pedal depression sensor 91, a rotation speed sensor 13 of the engine 1, A vehicle speed sensor 14 and the like are connected, and when the signals from these sensors and the output voltage signal of the generator 3 are input from the power converter 4, the output circuit issues a command to the power controller 6. , the power supplied to the motors 71, 72, 73, and 74 is controlled so as to energize the vehicle to run under load.

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

[0012] When the vehicle is running, the running load changes in size as time passes, but the engine is always operated at a predetermined high load state, and the loads on the wheels are kept low based on signals from various sensors. In this case, regenerative power from the generator 3 is applied to the battery 5 to charge it, and if the load on the wheels is higher than a predetermined load, the motors 71 to 7
The recovered power and the power from the battery 5 are supplied to the motor 4 for power running to cope with the high load.

Therefore, as shown in FIG. 3, the engine load is operated at an almost constant high load state, and the exhaust temperature of the engine exceeds the energy recovery area line shown by the dashed line in FIG. This results in better recovery. Note that FIG. 5 is a drawing showing an example of a state in which the motors attached to the wheels are supplied with recovered power and energized when the load of the vehicle is at its peak.

Although the present invention has been described above with reference to the above-mentioned embodiments, various modifications can be made within the scope of the gist of the present invention, and these modifications are not excluded from the scope of the present invention.

[0015]

As described above, according to the present invention, the adiabatic engine is always operated at a predetermined high load state to discharge high temperature exhaust gas, and the generator is driven to recover the electric power. When the load on the wheels is small, the battery stores electricity,
In addition, when the load is heavy, the power recovered from the generator is supplied to the motor directly connected to the wheels, and the motor is energized with power from the battery, so the engine is always operated in the range where energy can be recovered and the energy is recovered. This has the effect of increasing efficiency and also has the advantage of reducing engine consumption in the entire driving range.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram showing an embodiment of an energy recovery and vehicle drive system for an adiabatic engine according to the present invention.

FIG. 2 is a block diagram showing an example of the configuration of this embodiment.

FIG. 3 is a drawing showing the state of engine load in this embodiment.

FIG. 4 is a drawing showing the state of exhaust gas temperature in this embodiment.

FIG. 5 is a drawing showing the relationship between the vehicle load and the power supplied to the motor in this embodiment.

FIG. 6 is a drawing showing the relationship between engine load and energy recovery efficiency.

FIG. 7 is a drawing showing an example of changes in engine load over time.

FIG. 8 is a diagram showing the relationship between a change in exhaust gas temperature and an energy recovery area in a conventional system.

[Explanation of symbols]

1...Engine 2...Turbine 3... Generator 4...Power converter 5...Battery 6...Power controller 8...Controller 71-74...Motor

Claims (2)

[Claims] 1. Energy conversion means for converting exhaust energy from an adiabatic engine into electric power; power storage means for storing electric power from the energy conversion means; and operation by receiving electric power from the energy conversion means and the power storage means. energy recovery for an adiabatic engine, comprising: a wheel drive means for operating the adiabatic engine at a predetermined high load state; and an operation control means for operating the wheel drive means when the vehicle load exceeds the engine load. and vehicle drive equipment. 2. The energy recovery and vehicle drive system for an adiabatic engine according to claim 1, wherein said wheel drive means is a motor connected to a wheel.