JP2000108645A - Heating system for water-cooled engine vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To shorten the engine warming-up time and to improve the high-speed heating performance by providing a hot water circuit for indoor supply for circulating the engine cooling water driven by a water pump to a heater core. SOLUTION: A hot water circuit for indoor supply 5 is divided into an engine circulation circuit 5A and a circulation circuit exclusive to a heater 5b by a water valve 8, and a water pump 10 exclusive to the heater is mounted on the circulation circuit exclusive to the heater 5B. Whereby the loss that the cooling water warmed by the engine 1 is guided to a heater core 7 can be prevented in the warming-up, and the warming-up time can be shortened. In the start of the heating, the loss that the cooling water heated by an auxiliary heater 9 flows to the engine 1 can be prevented, and the high speed heating performance can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a heating device for a water-cooled engine vehicle.

[0002]

BACKGROUND OF THE INVENTION As shown in FIG. 2, an auxiliary heater J2 is disposed in an indoor supply hot water circuit J1 to improve the heating performance, and cooling water supplied from an engine J3 is supplied to the auxiliary heater J.
2 and the heated cooling water is supplied to heater core J4.
We are developing something that dissipates heat.

[0003]

In the system described above, the cooling water warmed by the engine J3 is guided to the heater core J4 when the engine J3 is warmed up.
There is a problem that it takes time to warm up 3. Even during heating using the auxiliary heater J2, the cooling water heated by the auxiliary heater J2 flows to the engine J3 side.
There is a problem that the circulation path of the cooling water heated in Step 2 becomes long, and the rapid effect of heating deteriorates.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a heating device for a water-cooled engine vehicle capable of shortening an engine warm-up time and improving heating speed. .

[0005]

Means for Solving the Problems When the engine is warmed up, the engine circulation circuit is provided by a water valve, so that the loss of the cooling water heated by the engine to the heater core side is eliminated, and the engine-specific warming-up of the engine is achieved. Therefore, cooling water can be circulated, and as a result, the warm-up time of the engine can be reduced. When heating using the auxiliary heater, the water heater valve creates a dedicated circulation circuit for the heater, which eliminates the loss of cooling water heated by the auxiliary heater to the engine side, and forms a short-time hot water circuit to quickly effect heating. Is improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic configuration diagram of a heating device for a water-cooled engine vehicle. The water-cooled engine vehicle includes, in addition to the engine 1, a water pump 2, a thermostat 3, a hot water circuit 4 for heat radiation, and a hot water circuit 5 for indoor supply.

The thermostat 3 is a valve that regulates the amount of cooling water guided to the heat radiating water circuit 4 to stabilize the temperature of the cooling water. Sometimes closed and heat water circuit 4 for heat radiation
To reduce the flow rate. The heat radiating water circuit 4 guides the cooling water to the radiator 6 for radiating the outside air, and the cooling water radiated by the radiator 6 is returned to the engine 1. The indoor supply hot water circuit 5 guides cooling water to a heater core 7 for heating disposed in the vehicle interior, and the cooling water passing through the heater core 7 is returned to the engine 1.

[0008] The indoor supply hot water circuit 5 is provided with a water valve 8. The water valve 8 is, for example, a four-way valve, and divides the indoor supply hot water circuit 5 into an engine circulation circuit 5A and a heater-dedicated circulation circuit 5B when receiving a switching instruction from a control device (ECU or the like) not shown. It is. The engine circulation circuit 5A is a circuit that circulates cooling water to the engine 1 independently of the heater core 7. The heater-specific circulation circuit 5B is a circuit that circulates cooling water to the heater core 7 independently of the engine 1 and the water pump 2.

An auxiliary heater 9 (for example, an electric heater, a combustion heater, a heat storage heater, etc.) is provided in the heater exclusive circulation circuit 5B, and cooling water circulating through the heater exclusive circulation circuit 5B is heated by the auxiliary heater 9. It is provided to be. Further, since the heater-dedicated circulation circuit 5B is independent of the water pump 2, a heater-dedicated water pump 10 is provided. The heater-dedicated water pump 10 is provided so that the cooling water is circulated in the heater-dedicated circulation circuit 5B. Have been.

During a warm-up operation when the outside air temperature is low, when the controller determines that it is better to reduce the warm-up operation time by detecting the outside air temperature by an outside air sensor (not shown) and calculating the signal by the controller. The control device switches the water valve 8 as shown in FIG. 1 to divide the indoor supply hot water circuit 5 into an engine circulation circuit 5A and a heater-dedicated circulation circuit 5B. Then, the loss of the cooling water heated by the engine 1 to the heater core 7 side is eliminated, and the cooling water can be circulated for the engine's own warm-up. As a result, the engine 1
Warm-up time can be reduced. Further, since the warm-up time of the engine 1 can be reduced, the combustion efficiency of the engine 1 can be improved, and the fuel efficiency can be reduced. Further, the reduction in the activation of the catalyst enables the reduction of CO, HC and NOx.

At the start of heating when the indoor temperature is low, the indoor temperature is detected by a vehicle interior sensor (not shown), the signal is calculated by the control device, and the control device determines that it is better to improve the rapidity of heating. In this case, the control device controls the water valve 8,
As shown in FIG. 1, switching is performed to divide the indoor supply hot water circuit 5 into an engine circulation circuit 5A and a heater circulation circuit 5B, and to activate the auxiliary heater 9 and the heater water pump 10. Then, the loss of the cooling water heated by the auxiliary heater 9 flowing to the engine 1 side is eliminated,
By forming a short hot water circuit, the immediate effect of heating is improved.

When the room temperature rises, the control device interrupts or stops the operation of the auxiliary heater 9. In addition, a signal from a solar radiation sensor or a signal from a user switch is incorporated into the control device to interrupt the operation of the auxiliary heater 9,
It may be provided to stop. Further, the auxiliary heater 9
The operation of the heater-dedicated water pump 10 increases the electric load of the vehicle, thereby increasing the output of the alternator and increasing the load on the engine 1 to improve the warm-up performance.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a heating device for a water-cooled engine vehicle.

FIG. 2 is a schematic configuration diagram of a heating device for a water-cooled engine vehicle.

[Explanation of symbols]

 Reference Signs List 1 engine 2 water pump 5 indoor supply hot water circuit 5A engine circulation circuit 5B heater-only circulation circuit 7 heater core 8 water valve 9 auxiliary heater 10 heater-only water pump

Claims (1)

[Claims] 1. A heating device for a water-cooled engine vehicle comprising an indoor supply hot water circuit for circulating engine cooling water driven by a water pump to a heater core for heating, wherein the indoor supply hot water circuit comprises: (a) A) a water valve for dividing an engine circulation circuit that circulates cooling water to the engine independently of the heater core, and a heater-only circulation circuit that circulates cooling water to the heater core independently of the engine and the water pump; (B) an auxiliary heater provided in the heater-dedicated circulation circuit and heating the cooling water; and (c) a heater-dedicated water pump for circulating the cooling water in the heater-dedicated circulation circuit. Heating system for water-cooled engine vehicles.