JPH0456621A - Hot water control device in heater for vehicle - Google Patents

Abstract

PURPOSE:To increase a heat exchange temperature at a heat core and to improve an effect to regulate temperature in a car room by locating a branch passage, communicated to a thermostat housing, at the hot water outlet passage of a heater core and mounting a switching valve, switching a flow passage to the branch passage side when an open air temperature is below a given value, to the branch part thereof. CONSTITUTION:When an open air temperature is higher than a given value, a branch passage 13 of a heater core 10 is closed by means of a switching valve 14. Thus, hot water after heat exchange flowing out from the heater core 10 is returned to a passage 4 on the feed side between a thermostat housing 7 and a water pump 9 through the normal side 12a of a hot water outlet passage 12. Meanwhile, when an open air temperature is below the given value, according to a detecting signal from an open air temperature sensor 15, a switching valve 14 is controlled by means of a control amplifier 16 to switch a flow passage to the branch passage 13 side. Thus, hot water the temperature of which is decreased due to heat exchange at the heat cord 10 flows through a branch passage 13 to the thermostat housing 7 to decrease the temperature of hot water at the inside. As a result, the temperature of water at the hot water inlet of the heater core 10 can be increased.

Description

[Detailed description of the invention] Industrial applications The present invention relates to a hot water control device for a vehicle heater.

Conventional technology Figure 2 shows a conventional structure, where l is a radiator and 2
Reference numeral 3 indicates an engine body, and 3 indicates a cooling water circulation path connecting the radiator 1 and the engine body 2 (more specifically, a water jacket), and a thermostatic valve 6 is provided in the feed side passage 4. A thermostat housing 7 housing a temperature sensing portion 6b downstream of the valve body 6a of the thermostat valve 6 is connected to the vicinity of the engine body outlet of the return side passage 5 of the cooling water circulation system path 3 via a bypass passage 8, and is connected to the vicinity of the engine body outlet of the return side passage 5 of the cooling water circulation system passage 3. A portion of the hot water immediately after flowing out is introduced into the thermostat housing 7.

IO indicates a heater core, the hot water inlet passage 11 of which is connected upstream of the bypass passage connection part of the return side passage 5, and the hot water outlet passage 12 is connected to the thermostat housing 7 and the engine body 2, more specifically. is connected to the feed side passage 4 between the water pump 9 and the hot water after heat exchange is returned to the feed side passage 4. This similar structure is shown, for example, in the Toyota Crown new model car manual published by Toyota Motor Corporation in August 1981, pages 3-44.

Problems to be Solved by the Invention In the above-mentioned engine inlet water temperature control system, the hot water inlet water temperature of the heater core 10 is T H/C, the hot water outlet water temperature is TH/C', the bypass passage water temperature is TC, and the thermostat housing water temperature is Assuming that TS is the opening temperature of the thermostat valve 6 and TT/S is the opening temperature of the thermostat valve 6, the hot water of TH/C' flowing out from the heater core 10 is returned to the feed side passage 4 between the thermostat housing 7 and the water pump 9. Therefore, the hot water inlet water temperature and the bypass passage water temperature are TH/C=TC. This bypass passage water temperature TC is the valve opening setting temperature T of the thermostatic valve 6.
When T/S is reached and T'C=TT/5(TS),
The thermostat valve 6 opens, and the cooling water from the radiator 1 flows into the engine body 2, and the hot water inlet water temperature TH/C drops. That is, this hot water inlet water temperature T H/C is uniquely determined by the valve opening setting temperature TT/S of the thermostatic valve 6.

On the other hand, in consideration of the temperature control effect in the vehicle interior, when the outside air temperature is low, it is desirable to increase the heat exchange temperature in the heater core 10 to perform rapid heating. Therefore, in order to meet this demand, it is conceivable to raise the opening temperature of the thermostatic valve 6, but this would cause the steady engine cooling water temperature to become higher, resulting in deterioration of engine performance such as a decrease in output. Put it away.

Therefore, the present invention provides a vehicle heater that can increase the heat exchange temperature in the heater core when the outside temperature is low without causing a steady rise in engine coolant temperature, thereby improving the temperature control effect in the vehicle interior. This provides a hot water control device.

Means for Solving the Problem A thermostatic valve is provided in the foot side passage of the cooling water circulation system that connects the radiator and the engine body, and the thermostat housing housing the temperature sensing part downstream of the valve body is connected to zero or A configuration in which the warm water inlet passage of the heater core is connected to the return side passage of the cooling water circulation system, and the hot water outlet passage is connected to the feed side passage between the thermostat housing and the engine body. A branch passage communicating with the thermostat housing is provided in the hot water outlet passage of the heater core, and based on the detection action of the outside air temperature detection means, water flows to the branch passage side when the outside air temperature is below a predetermined value. A switching valve is provided to switch the path.

When the operating outside air temperature is higher than a predetermined value, the branch passage of the heater core is closed, and the hot water flowing out from the heater core is returned to the feed side passage between the thermostat housing and the engine body. When the outside air temperature is below a predetermined value, the switching valve is operated by the detection action of the outside air temperature detection means, and the flow path of hot water flowing out from the heater core is switched to the branch path side.

Therefore, the hot water whose temperature has been lowered by heat exchange in the heater core is introduced into the thermostat housing, thereby lowering the temperature of the hot water in the thermostat housing. As a result, the hot water inlet water temperature of the heater core is balanced at a temperature higher than the valve opening temperature of the thermostatic valve.

Embodiment Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings, with the same reference numerals assigned to the same parts as in the conventional structure.

In FIG. 1, a thermostatic valve 6 is provided in the feed side passage 4 of the cooling water circulation system 3 that connects the radiator l and the engine body 2, and the valve body 6a is provided with a thermostatic valve 6.
The thermostat housing 7 housing the temperature sensing part 6b downstream is connected to the vicinity of the engine main body outlet of the return side passage 5 via the bypass passage 8, and the heater core I
The hot water artificial passage 11 of O is connected upstream of the bypass passage connection part of the return side passage 5, and the hot water outlet passage 12 is connected to the thermostat housing 7 and the water pump 9.
The basic structure, such as the connection to the feed side passage 4 between the two, is the same as the conventional one.

Here, the hot water outlet passage 12 is provided with a branch passage I3 communicating with the thermostat housing 7, and a switching valve 14 is disposed at the branch part. This switching valve 14 is operated via a control amplifier 16 based on the detection action of an outside temperature sensor 15 serving as an outside temperature detection means, and normally closes the branch passage 13 side, but when the outside air temperature reaches a predetermined value. If it is below, the flow path is switched to the branch passage 13 side based on the detection result of the outside air temperature sensor 15.

According to the above embodiment device, when the outside air temperature is higher than a predetermined value, the branch passage 13 of the heater core 10 is connected to the switching valve 1.
4, the hot water after heat exchange flowing out from the heater core IO is returned to the feed side passage 4 between the thermostat housing 7 and the water pump 9 via the normal side 12a of the hot water outlet passage 12. . Therefore, the hot water inlet water temperature TH/C of the heater core 10 is uniquely determined by the valve opening temperature setting of the thermostatic valve 6, which is set to an upper limit temperature that does not deteriorate engine performance.

When the outside air temperature is below a predetermined value, this outside air temperature condition is quickly detected by the incoming salt sensor 15, and the switching valve 14 is operated via the control amplifier 16 to switch the flow path to the branch path I3 side. Therefore, the hot water whose temperature has been lowered to TH/C' through heat exchange in the heater core 10 flows into the thermostat housing 7 from this branch passage 13, and the hot water temperature in the thermostat housing 7 is lowered from TS to TS'.

As a result, it takes a long time for the thermostat housing water temperature TS' to reach the valve opening setting temperature TT/S of the thermostat valve 6, and the engine body outlet water temperature represented by temperature TC or TH/C is the valve opening setting temperature. Balance comes to be at a higher temperature than TT/S. That is, the hot water inlet temperature of the heater core 10 can be increased without increasing the valve opening set temperature TT/S, and the heater performance at low outside temperatures can be improved.

Effects of the Invention As described above, according to the present invention, the hot water flowing out from the heater core is introduced into the thermostat housing via the branch passage by operating the switching valve when the outside temperature is low, thereby lowering the water temperature of the thermostat housing. , it is possible to balance the engine body outlet water temperature to a high temperature,
The temperature of the hot water inlet of the heater core can be increased, and therefore the heater performance at low outside temperatures can be improved. On the other hand, under normal conditions where the outside temperature is higher than the predetermined value, the hot water flowing out from the heater core is returned to the feed side passage between the thermostat housing and the engine body as in the past, so the engine body outlet water temperature is controlled by the thermostat valve. The temperature is controlled at a lower temperature determined by the valve opening temperature. As a result,
This has a great practical effect in that it is possible to simultaneously improve heater performance at low outside temperatures and ensure engine performance at steady state without increasing the opening temperature setting of the thermostatic valve.

[Brief explanation of the drawing]

FIG. 1 is a schematic system diagram showing one embodiment of the present invention, and FIG. 2 is a schematic system diagram of a conventional device. 1...Radiator, 2...Engine body, 3...Cooling water circulation system path, 4...Feed side passage, 5...Return side passage, 6...Thermostat valve, 6a...
- Valve body, 6b... Temperature sensing part, 7... Thermostat housing, 8... Bypass passage, lO... Heater core, 11... Hot water inlet passage, 12... Hot water outlet passage, 13.・Branch passage, 14・Switching valve, 15・
...Outside temperature detection means. 3 other people

Claims (1)

[Claims] (1) A thermostatic valve is provided in the feed side passage of the cooling water circulation system that connects the radiator and the engine body, and the thermostat housing housing the temperature sensing section downstream of the valve body is connected to the cooling water circulation system through the bypass passage. In a configuration in which the hot water inlet passage of the heater core is connected to the return side passage while communicating with the return side passage, and the hot water outlet passage is connected to the feed side passage between the thermostat housing and the engine body, the hot water of the heater core is connected to the return side passage. A branch passage communicating with the thermostat housing is provided in the outlet passage, and a switching valve is provided at the branch part to switch the flow passage to the branch passage when the outside air temperature is below a predetermined value based on the detection action of the outside air temperature detection means. A hot water control device for a vehicle heater, characterized in that: