JPS63111269A - Exhaust heat utilizing device for engine - Google Patents

Abstract

PURPOSE:To improve the general engine performance by providing an element member adapted to absorb and generate heat corresponding to the direction of applying an electric current on a high temperature portion of an engine, and controlling element member to change an effect mode thereof according to the operating condition of the engine. CONSTITUTION:A cylinder block 1 includes an element member 13, the inner peripheral portion of which is positioned in a combustion chamber 6 and the outer peripheral portion thereof is positioned in a water jacket portion 11. The element member 13 is adapted to generate power according to Seebeck effect by endothermic, and to absorb and generate heat according to Peltier effect corresponding to the direction of applying an electric current. On the other hand, the water jacket 11 is fitted with a water temperature sensor 18, and according to a signal from the water temperature sensor 18 or the like, an effect mode of the element member 13 is controlled to change by CPU 20. For example, in case of conducting warming up, the element member 13 is set in a Peltier effect mode, so that an electric current is applied in a designated direction to heat the combustion chamber 6, thereby reducing the warming-up time.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an engine exhaust heat utilization device that effectively utilizes engine exhaust heat using elements that produce the Seebeck effect and the Bertier effect.

(Prior art) Conventionally, when two different metals or semiconductors are connected to form a closed circuit and a temperature difference is applied between the two contacts, the Seebeck effect (Secbeck effect), where current flows in a fixed direction, has been observed.
(also called the thermoelectric effect) and the Bertier effect (Pettier effect), which occurs when two different metals or semiconductors form a closed circuit, and when a current is passed through this open circuit, heat is generated and absorbed at the connected part. -fect) is known.

A device that effectively uses engine exhaust heat using an element that produces such a Nage-Beck effect and a Beltier effect is as follows.
For example, there is a cooling device for internal combustion engine agent 1ijX 13'a described in JP-A-60-195327.

That is, the thermoelectric generating element generates electricity based on the above-mentioned Seebeck effect by absorbing heat, and the cooling element absorbs heat based on the above-mentioned Beltier effect when energized, and the cooling element absorbs heat by the current flowing through the thermoelectric generating element. F, Q tJ, 1) θ cooling f, 11 elements are connected to each other to form a closed circuit so as to generate Internal combustion engines such as fuel injection valves and automotive storage boxes! 11410
00 Cooling equipment installed in the cooling section.

While this conventional device has the advantage of effectively utilizing engine exhaust heat to cool the necessary parts, it also improves engine performance depending on the engine operating condition, for example by shortening the warm-up time. There was a problem that it could not be done.

(Objective of the Invention) The present invention is capable of improving engine performance according to the engine operating condition by changing and controlling the effects of the Beltier effect and the Seebeck effect of the element members in accordance with the engine operating condition. The purpose is to provide a device that utilizes engine exhaust heat.

(Structure of the Invention) The present invention provides an element member that is provided in a wet part of an engine and absorbs heat and generates heat in accordance with the direction of current flow, an operating state detection means that detects the operating state of the engine, and an element member that detects the operating state of the engine. The present invention is characterized in that it is an engine exhaust heat utilization device comprising: i, 11ti1 means for changing and controlling the effect mode of the element member based on the output of the detecting means.

(Effects of the Invention) According to the present invention, the control means determines the effect mode of the element member (Beltier effect mode or Seebeck effect mode) based on the output from the above-mentioned operating state detection means. Since the engine performance can be improved depending on the operating state of the engine, for example, when starting the engine in cold weather to warm up the engine, the above-mentioned control By setting the element member in a Peltier effect mode and passing a current in a predetermined direction, it is possible to heat the combustion chamber and shorten the heating time 1a.

In addition, during normal operation after the above-mentioned warm-up operation or after the engine is stopped, the element member is set to the Seebeck effect mode by the above-mentioned control means, so that, for example, the upper end of the cylinder bore (
By heating a predetermined end of the element member placed in the high-temperature part) in the high-temperature atmosphere of the combustion chamber, a thermoelectromotive force is generated, and this thermoelectromotive force is used to operate the engine auxiliary equipment, which is particularly effective. .

(Example) An embodiment of the present invention will be described in detail below based on the drawings.

The drawing shows an exhaust heat utilization system of an engine, and in FIG. The combustion chamber 6 is opened and closed as appropriate by opening and closing the valve 5.
An intake boat 7 and an exhaust boat 8 are respectively formed to communicate with the cylinder block 1, and a piston 9 is disposed within the cylinder block 1 described above.

Further, the above-mentioned cylinder block 1 is formed with a water jacket 1-10.11, and the cylinder head 3 is formed with another water jacket 12 which communicates with the above-mentioned water jacket 11.

An element member 13 is disposed at the upper end of the cylinder bore in the cylinder block 1 described above.

This element member 13 is an annular element member whose inner periphery is located in the combustion chamber 6 and whose outer periphery is located in the A-pull 11 bracket 11, and generates electricity by absorbing heat. It absorbs heat and generates heat in response to.

As shown in FIG. There is a high temperature side heat receiving plate 14 which also serves as a heating plate, and on the outer periphery of the water jacket 11 side there is a cooling plate located for each semiconductor n and p and insulated from each other by an insulating sealing material 15. The low-temperature side heat sinks 16 that also serve as the above-mentioned ? 3 When heating the hot side heat receiving plate 14, the electromotive force is reduced by 1 due to the Pebeck effect! ? , MarC
1 each element 16. p.

When current is applied in the order of 14, n, and 16, the Pelge 1 effect occurs.''The high temperature side heat receiving plate 14 is configured to generate heat other than Joule heat.

Furthermore, a heat insulating material 17 is provided between the above-mentioned n semiconductor n and p type semiconductor p, and a heat insulating material +A18 is also provided between the element member 13 and the upper end surface of the sill block 1.

Here, as a material for forming the first element member 13, for example, a chalcogen compound (Bi2Tc3.PbTE
), preferably chalcogen-based amorphous semiconductors or metal silicides such as CrSi2. HnSil, 73. FeSi2
．． CoSi, preferably an amorphous semiconductor such as FcSi2 thin film, and others can be used.

By the way, the aforementioned cylinder block 1 is equipped with a water temperature sensor 1J18 for detecting the water temperature inside the water jacket 10.

The CPU 20 changes the effect mode on the element member 13 according to the program stored in the ROM 19 based on the input of various signals such as the water temperature signal and the engine rotation speed signal from the wood water temperature hinge 18 (above). control, RAM21
records necessary data such as preset water temperature signal data.

In addition, in FIG. 1, 22 is a valve seat, 23 is a valve guide, and 24 is a DC power source.

The operation of the engine exhaust heat utilization device configured in this way is as follows.
This will be explained with reference to the flowchart shown in FIG.

In a first step 31, the CPU 20 reads various signals such as an engine speed signal and a water temperature signal.

Next, in a second step 32, the CPLJ 20 determines whether the current water temperature is higher than a preset water temperature, for example, 80° C., based on the water temperature signal V from the water temperature sensor 18 mentioned above. When t≦80°C and it is determined that the machine is in warm operation, the process goes to the next third step 33, and conversely, when it is determined that t>80°C and the machine is in normal operation, it goes to another fourth step. 34.

In the third step 33 described above, the CPU 20
Set to Beltier effect mode. That is, the DC power supply 24 is applied to each element of the element member 13 at 16, p, 1/1. n,
16, the high temperature side heat receiving plate 14 acts as a heating plate, and the combustion chamber 6 is heated by generating heat other than Joule heat from this heating plate.

As a result, there is an effect that the warm-up continuous rotation time can be shortened.

On the other hand, in the fourth step 34 described above, the CPU 20 sets the element member 13 to the Seebeck effect mode. That is, the connection of the DC power supply 24 to the above-mentioned element part 'vi13 is removed in terms of the circuit, and the high-temperature side heat receiving plate 14 located on the inner peripheral part of this element member 13 is placed in the cool atmosphere of the combustion chamber 6. The engine is heated, and the low-temperature side heat sink 16 located on the outer periphery is cooled with engine cooling IJ1 water in the water jacket 11.

If the element member 13 (e) above is set to the Seebeck effect mode after the warm-up operation, a thermoelectromotive force will be generated in the above-mentioned armature member 13 due to the high temperature gradient.
By extracting this thermal electromotive force, engine compensation can be effected. In addition, as another control, for example, the combustion chamber can be heated by setting the Beltier effect mode to flow current in a predetermined direction during deceleration fuel cut 1 to 1, so that during deceleration fuel cut, J3 When returning from deceleration fuel cut due to the room being cooled n1, it is possible to prevent poor ignitability and difficulty in returning.
Furthermore, during idling operation when the combustion temperature is relatively low, the combustion chamber can be heated by setting the Beltier effect mode similar to the deceleration fuel cut described above.

In addition, element members can be placed around the engine exhaust system, for example around the catalyst, and touched! 1. When the catalyst temperature is low, by setting the Beltier effect mode and passing current in a predetermined direction, it is possible to quickly improve the catalyst temperature.Conversely, when the catalyst temperature is high, when the catalyst temperature is low By passing a current in the opposite direction, the temperature of the catalyst can be lowered and thermal deterioration can be prevented.

In general, the temperature of the oil can be set to an upper limit by arranging the element member in the oil pan, and when the oil temperature is low, by setting it to the bellboot effect mode and flowing a current in a predetermined direction. Therefore, the viscosity can be reduced, and the sliding resistance due to the high viscosity of the oil can be reduced when the oil is cold. Conversely, when the oil temperature is high, it is possible to reduce the viscosity in the opposite direction from when the oil temperature is low. The oil can be cooled by passing an electric current through it.

In the correspondence between the structure of this invention and the above-mentioned embodiment, the operating state detection means of this invention is the water temperature sensor 1 of the embodiment.
Similarly, the control means corresponds to CF'tJ20, but the present invention is not limited to the configuration of the above-described embodiment.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; Fig. 1 is a system diagram showing an engine exhaust heat utilization device, Fig. 2 is a sectional view taken along the line ■-■ in Fig. 1, and Fig. 3 is a flow chart. . 13... Element member 18... Water temperature sensor 20
...CPU Figure 1 13...Kijiri

Claims (1)

[Scope of Claims] 1. An element member that is provided in a high-temperature part of the engine and absorbs heat and generates heat in accordance with the direction of current flow; an operating state detection means for detecting the operating state of the engine; and the above operating state detection means. An exhaust heat utilization device for an engine, comprising: control means for changing and controlling the effect mode of the element member based on the output of the engine.