JPS6079149A - Intake gas heating device in internal-combustion engine for car - Google Patents

Abstract

PURPOSE:To improve the starting and warming performances of engine by feeding air heated through a hot gas combustion heater through a communication path having an air-flow regulating mechanism to an engine intake tube. CONSTITUTION:A hot gas combustion heater 2 for compensating the insufficient heat source in cold area will burn a combustion tube 22 while rotating a combustion air intake fan 25 and a warm air intake fan 27 through a double shaft motor 28 then the warm air fed through an intake port 26 is heated through a heat-exchanger 29 and discharged through a warm air path 5 to an airconditioner 3. Here, a path 6 communicating between said path 5 and the intake tube 45 of engine 4 is provided while an air-flow regulating mechanism 7 is provided in the path 6. The air-flow regulating mechanism 7 will control the negative pressure exchange valves 73, 74 on the basis of output from a cooling water temperature sensor 81 to regulate the operating amount of an air pressure servo 72 thus to control the opening of a damper 71.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an intake air heating device for an RLI internal combustion engine equipped with a warm combustion type heater.

There is a drought preheating type heater that heats engine cooling water using a combustion type heater to improve engine startability and warm-up performance. Another option is to apply it to the engine, but since the former uses water as a medium, it takes a long time to improve engine startability and warm-up, while vil has a low thermal efficiency, so the effect of improving startability and warm-up is small. .

SUMMARY OF THE INVENTION An object of the present invention is to provide an intake air heating device for an internal combustion engine that is optimal for improving engine startability and warm-up performance after engine startup in a vehicle equipped with a combustion heater.

An intake air heating device for an internal combustion engine of a vehicle according to the present invention includes a hot air combustion type heater, a communication passage that connects an air passage heated by the hot air combustion type heater and an intake pipe of the engine, and the communication passage. It consists of a wind adjustment mechanism attached to the

The present invention will be explained with reference to embodiments shown in the drawings.

Reference numeral 1 denotes an intake air heating device for an internal combustion engine of a vehicle according to the present invention, and in this embodiment, it is applied to a vehicle equipped with a diesel engine. 2 is I in cold regions! A moisture combustion type heater (hereinafter referred to as a combustion type heater) is installed in the engine compartment to compensate for the lack of a heat source in one chamber, 3 is an air conditioner for the passenger compartment that is usually installed in the front of the vehicle cabin, and 4 is a diesel engine. , 5 supplies warm air heated by the combustion heater into the duct 31 of the air conditioner M3 II! The chamber air pure air passage is a communication passage connecting the chamber air passage and the engine intake pipe, and 7 is a wind mgI4 node mechanism provided in the communication passage 6.

The combustion type heater 2 includes a cylindrical heater case 20, and
A cylindrical combustion tube 22 that burns fuel, a fuel pipe 21 that sends fuel to the combustion tube 22, a glow plug 23 that ignites the fuel during startup, and a combustion tube 22 that sucks combustion air from a heater intake pipe 24. A combustion air suction fan 25 that supplies heating air (outside air) to the heater case 2
A heating air suction fan 27 for taking in heating air from a heating air intake port 26 provided at one end of the combustion chamber 2, a double-shaft motor 28 for driving these fans 25 and 27, and an outside of the combustion tube 22. A heat exchanger 29 that exchanges heat with the combustion exhaust gas burned in the combustion tube 22, and a heater exhaust pipe 30 that discharges the combustion exhaust air.
After the heating air is heated through the intake port 26 around the combustion tube 22 and the heat exchanger 29, it is discharged to the air conditioner 3 through the heating air passage 5.

The air conditioner 3 has an outside air intake port 3A and a vehicle interior air intake port 3B formed on the windward side, and a ventilation outlet 3C, a defroster outlet 3D, and a footwell outlet (or warm air outlet) 3F on the leeward side. Dak 1
- 31, an inside/outside air switching damper 32 provided at the 1 m end of the duct 31 to adjust the opening degree of the outside air intake port 3A and the vehicle interior air intake port 3B, a blower 33 which is a Jil supply source, and A heater core 34 of a heating device (hot water heater) that uses engine cooling water provided on the leeward side of the blower 33, and an air mix damper 35 that adjusts the amount of M passing through the heater core 34 and the amount of air bypassing the heater core 34. , a defroster damper 36 that switches between the ventilation outlet 3C and the defroster outlet 3D, and a heater damper 31 that opens and closes the foot outlet 3F.
Heating air intake 3B supplied from Itata 2 in a combustion manner
Equipped with. Note that a cooler unit having an evaporator can be disposed between the blower 33 and the heater core 34.

The engine 4 includes an injection nozzle 41 that atomizes high-pressure fuel sent from a fuel injection pump (not shown), a piston 44 that forms a combustion chamber 42 at its head, and transmits the combustion pressure generated therein to a connecting rod 43. An engine intake pipe 45 for sucking combustion air into the combustion chamber 42, an air cleaner 47 disposed upstream of the engine intake pipe 45 and containing an air cleaner element 46, and an engine exhaust pipe 4B for exhausting combustion exhaust gas. It has a well-known configuration with

The ffl amount adjustment mechanism 1 includes a valve body 102 attached to a support shaft 701 provided in the communication passage 6 and whose both ends are supported by the wall of the communication passage 6, and a link plate fastened to one end of the support shaft 701. 703; and an actuation rod 705, which is a negative pressure actuator and whose tip is connected to the link plate 703 via a link rod 704.
A vacuum pump 70 (in the diesel engine 4, an intake Since negative pressure cannot be taken from the manifold, the vacuum pump is closed. It consists of an i-valve 74 and 113 units of these negative pressure switching valves. The air pressure servo 12 includes die 17 flamms 712, 76 and 13, which are provided at predetermined intervals in a metal case 111 and are made of two polyester fibers or the like covered with a rubber-like elastic material, as shown in FIG. A coil spring 714 for return is provided in front of the first diaphragm 712, and the second diaphragm 713 is fixed.
A coil spring 715 for return is provided in front of the diaphragm 712, a support member 116, 717 is fixed to the center of each diaphragm 712, 713, and the rear end of the actuating rod 705 is fixed to the hollow of the support member jtA717. A movable member 718 is provided between the first diaphragm 716 and 717 and is fixed to the support member 716 and is slidable relative to the support member 717.
12 and the case 711.
A negative pressure chamber 721 is configured, and a second negative pressure chamber 722 is configured in a space partitioned by the first diaphragm 712, the case 711, and the second diaphragm 713.

Each negative pressure chamber 721 and 722 is connected to the conduit 731 and 722.
1 to the first solenoid valve 73 and the second solenoid valve 74. The electromagnetic valves 73 and 74 have electromagnetic solenoids 732 and 742 fitted in valve cases 730 and 740, respectively, and valve bodies 736, 746, which are provided with return springs 734, 744, respectively.
It has a known configuration in which the valve lower 38.748 is turned on by suctioning.

The control device 8 for the solenoid valves 73 and 14 includes a cooling water temperature sensor 81 mounted on the water jacket of the engine;
The first electromagnetic valve 7 receives the output of the temperature sensor 81 as an input.
3 and a control circuit 82 that turns on and off the second solenoid valve 74.
It consists of

The operation of the damper 71 will be explained with reference to FIGS. 2.3.4 and 5. When the water temperature is low (for example, 30°C as shown in Figure 5)
℃), when the second solenoid valve 74 is released (ON), negative pressure is introduced into both the first negative pressure chamber 721 and the second negative pressure chamber 722, as shown in FIG. first diaphragm 7
12 and the second diaphragm 713 are suctioned, and the actuating rod 7()5 is moved by the second stroke []-St2. In this case, the movable part v1718 slides between the support member 717 and the two negative pressure chambers 72.
1.722 acting force can be applied in two stages, the damper 71 is fully opened, and the warm air from the heater 2 is sufficiently sucked into the engine intake pipe 45, promoting vaporization of the injected fuel and facilitating ignition. , the engine starts smoothly and warms up. If the first solenoid valve 73 is opened (ON) when the water temperature rises further (for example, from 30 to 60°C as shown in FIG. 5), a negative pressure is created in the first negative pressure chamber 721 as shown in FIG. The pressure is guided, the first diaphragm 113 is sucked, the actuating rod 705 is moved by the first strophe Stl, the opening degree of the damper 71 becomes slightly smaller, and the hot air from the heater 2 is directed to the engine intake pipe 4 in a slightly smaller amount.
5 to promote warm-up. When the water temperature further rises (for example, 60° C. or higher as shown in FIG. 5), the damper 71 closes and all of the hot air from the combustion heater 2 is used for heating.

This embodiment has described the case of intake air heating VT1 in which the heating capacity deficiency of the air conditioner 3 is supplemented by the combustion type heater 2. It goes without saying that a heating device using only the heater 2 can also be applied as an intake air heating device for an internal combustion engine.

Furthermore, the heating air intake 38 in FIG. 1 does not have to be downstream of the heater core 734, but may be upstream of the heater core 34, or may have an air outlet completely independent of the air conditioner 3 in the vehicle interior. There may be. An air filter may be provided upstream of the heating air intake port 2G of the combustion type heater, and this air filter may be that of the engine 4.

As described above, the intake air heating device for the internal combustion ELLR3G vehicle according to the present invention directly supplies the air heated by the combustion heater as intake air to the engine in a vehicle equipped with a combustion heater, so that the starting performance of the carrot can be improved. It can be done quickly and reliably, and cold engine starts and machine operation immediately after starting are smooth and roaring. Further, since the warm-up operation is performed smoothly, the warm-up tendency and L after starting the engine are improved.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an intake air heating device for an internal combustion engine of a vehicle according to the present invention, and FIGS.
FIG. 5 is a graph showing the relationship between the water temperature sensor and the damper. 110- In the diagram 1...Intake heating device for internal combustion engine of vehicle 2...
・Hot air combustion heater 3... Air conditioner 4...
Diesel engine 6...Connection passage 7...I!
lil open adjustment mechanism 8... Negative pressure switching valve -II m
l device 45...Engine intake pipe 71...Damper 72...Atmospheric pressure servo 73.74...Negative pressure switching valve agent Kenji Ishiguro 11- Broom 3 Figure 4 Figure 1

Claims (1)

[Scope of Claims] 1) A hot air combustion type heater, a communication passage that connects an air passage heated by the hot air combustion type heater and an engine intake pipe, and an F/H nozzle connected to the communication passage. An intake air heating device for an internal combustion engine of a vehicle, comprising an ff1 adjustment mechanism. 2) The air pressure adjustment mechanism includes a damper provided in the communication passage, an air pressure servo that drives the damper, a negative pressure switching valve that supplies and discharges negative air intake pressure of the air pressure V-Bohe engine, and an engine cooling The intake air heating device for an internal combustion engine of a vehicle according to claim 1, comprising a water ff1FJi sensor and a control circuit that controls the negative pressure switching valve based on the output of the cooling water temperature sensor.