JPH02120119A - Heating apparatus for automobile - Google Patents

Abstract

PURPOSE:To make quick heating and engine warm-up selectable with one system by installing a flow control valve, controlling cooling water flow into a heat storage tank to store heat of engine cooling water, and a solenoid valve selecting the cooling water to flow into a heating radiator or the heat storage tank. CONSTITUTION:When a quick heater switch 23 is off and an engine warmer switch 21 is in an on-state, cooling water temperature Tw1 of an engine 11 being detected by temperature sensors 13, 15 is compared with engine cooling water temperature Tw2 in a heat storage tank 1 at a microcomputer 19, and when Tw1>Tw2 is the case, a solenoid valve 27 is opened and cooling water is fed to a heater core 5, while a flow control valve 25 is fully opened. On the other hand, when Tw1<=Tw2 is the case, this solenoid valve 27 is closed while the flow control valve 25 is fully opened. In addition, when the quick heater switch 23 is on, the solenoid valve 27 is opened when Tw1>Tw2 is the case, and simultaneously such a signal as enlarging a D/T ratio of the flow control valve 25 is delivered, thereby making the valve opening larger.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a hot water heating system for automobiles that improves the heating effect at the initial stage of engine startup.

[Conventional technology]

BACKGROUND ART Instant-act heating devices have been known as devices that improve the heating effect during the initial stage of engine startup, and there are heat storage types, electric types, combustion types, exhaust types, and the like. Furthermore, as for engine warmers that warm the engine at the initial stage of engine startup, a preheating type (heating a nichrome wire using a household power supply) is known.

[Problem to be solved by the invention]

However, there was no conventional system that could perform both an instant heating device and an engine warmer in one system.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a heating device for a vehicle that can switch between immediate heating and engine warm-up in one system.

[Means to solve the problem]

In order to achieve the above object, the present invention provides a heating system for a vehicle that uses engine cooling water as a heat source, and includes: a heating radiator provided between a cooling water inlet and a cooling water outlet of the engine; a heat storage tank that is provided between the heat radiator and the engine and stores heat of the engine cooling water; a flow control valve that controls the flow rate of the engine cooling water that flows into the heat storage tank; and a switching valve that switches whether the engine cooling water flows in from the engine or through the heat storage tank, and when the temperature of the engine cooling water is higher than a predetermined temperature, the switching valve The switching valve is switched so that the engine cooling water flows from the engine to the heating radiator, and when the temperature of the engine cooling water is below the predetermined temperature, the switching valve is switched so that the engine cooling water flows into the heating radiator. switching to flow into the heating radiator via the tank,
and during heating, the amount of engine cooling water flowing into the heating radiator via the heat storage tank is less than a predetermined amount;
When warming up the engine, the amount of engine cooling water flowing into the heating radiator via the heat storage tank is increased to be greater than a predetermined amount.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
The figure shows an embodiment of the present invention, in which 1 is a thermos type heat storage tank, 3 is water pulp, and 5 is a heating radiator (
heater core). 7 is a blower, and heater core 5
and sends warm air into the vehicle interior. 9 is a water valve, and 11 is an engine. In addition, the inside of the piping between the engine 11 and the heat storage tank 1, the inside of the heat storage tank 1, and the heater core 5
Temperature sensors 13, 15, and 17 are provided at each hot air blowing section, and the signals thereof are sent to the microcomputer 19. 21 is an engine warmer switch, 23 is an immediate heater switch, and these switch signals are sent to the microcomputer. 25 changes its valve opening degree according to a signal from the microcomputer 19,
This is a flow control valve that adjusts the amount of engine cooling water flowing into the heat storage tank 1. The solenoid valve 27 is connected to the microcomputer 1
9 to open the valve and send the engine cooling water directly from the engine 11 to the heater core 5, or to close the valve and send the engine cooling water from the engine 11 to the heater core 5 via the heat storage tank 1. It is. 2
9 is a battery, and 31 is an ignition switch.

In addition, in Fig. 1, the pipes A section and B section are connected to a cooler (not shown).
radiator).

Next, the operation of this embodiment will be explained using FIGS. 1 and 2. FIG. 2 is a flowchart showing arithmetic processing in the microcomputer 19 of this embodiment.

First, when the ignition switch 31 is turned on, power is supplied from the battery 29 to the microcomputer 19, and various calculation processes are started.

First, in step 101, the quick-acting heater switch 2
3 is in the on state. If it is on, proceed to step 112; if off, proceed to step 10.
Proceed to step 2. In step 102, it is determined whether the engine warmer switch 21 is in the on state. If the result of the determination is No, the process proceeds to step 108, and if YES, the process proceeds to step 103. In step 103, engine cooling water temperature Tw detected by temperature sensor 13 and engine cooling water temperature Tw in heat storage tank l detected by temperature sensor 15 are compared, and T w +
> In the case of T W 2, the judgment result is YES and the process proceeds to the next step 104, and in the case of Tw and 57wt, the judgment result is NO.
The process then proceeds to step 106. In step 104, a signal to open the solenoid valve 27 is sent, and in the next step 105
Proceed to. In step 105, a signal is sent to fully open the flow rate control valve 25 (for example, to a flow rate of about 61/min), and then this calculation process ends. In step 106, a signal is sent to close the electromagnetic valve 27, and in the next step 107, a signal is sent to fully open the flow rate control valve 25, after which the process returns to step 103. In step 10B, after sending out a signal to open the electromagnetic valve 27, the process proceeds to step 109 where Twl and Tw are compared, and if Tw,>Tw, the determination result is YES and the process proceeds to step 110. In step 109, Tw+
If ≦TW2, the result is No, and the process proceeds to step 111, where a signal to fully open the flow rate control valve 35 is sent, and then the process returns to step 109. In step 110, the flow control valve 2
After sending out a signal to fully open 5, the arithmetic processing ends.

If the determination result in step 101 is YES, that is, if the immediate-acting heater is selected, the process proceeds to step 112, where Tw and '[''wz are compared, and Tw,
>7w2, proceed to step 118 and Twl 57
w, the process advances to step 113. In step i18, a signal is sent to open the solenoid valve 27, and then in step 11
9, a signal is sent to increase the D/T ratio of the flow control valve 25, and the opening degree of the flow control valve 25 is increased. For this reason, the water flows without impairing the flow rate of the conventional heater water system.
At the same time, hot water is stored in the heat storage tank. In step 113, a signal is sent to close the solenoid valve 27, and in the next step 11
Proceed to step 4. In step 114, the temperature Ta detected by the temperature sensor 17 provided on the downstream side of the heater core 5 with respect to the air blowing direction.

Determine whether the temperature is 40°C or higher. Here Ta, 540
In the case of °C, the judgment result is YES and the next step 1
Proceed to step 15, and if Tag<40°C, the judgment result is NO.
Then, the process advances to step 117. In step 115, the D/T ratio control signal for the flow rate control valve 25 is sent, and the
Adjust the opening degree of the valve No. 5 to set the flow rate to about 0.5 to 1.0 ffi/min so that Ta approaches 40°C.

Thereafter, in step 116, it is determined whether Ta+=40°C, and Ta.

Step 115 and step 11 until -40°C
Repeat step 6. In step 116, Ta+=40
The judgment result of ``C'' becomes YES, and this arithmetic processing ends. In step 114, Tag<40°C.
If it is determined that this is the case, a signal is sent to increase the D/T ratio of the flow rate control valve 25 in step 117, the valve opening of the flow rate control valve 25 is maximized, and the arithmetic processing ends.

As explained above, according to this embodiment, when used as an engine warmer, the flow control valve 25 is fully opened,
Since the engine cooling water in the heat storage tank 1 flows at a high speed in the heater core 5, the amount of heat lost by the engine cooling water in the heater core 5 is reduced, and the engine 11 can be sufficiently warmed. On the other hand, when used as an immediate-acting heater, once the heater outlet temperature reaches 40'C or higher, the D/T ratio of the flow rate control valve 25 is reduced to reduce the flow rate to 0.
5-1. O1! Since the heating time is as small as approximately 1/min, the amount of heat taken away from the engine cooling water by the heater core 5 is large, and it is possible to blow out hot air that is effective as an immediate-acting heater.

In this embodiment, when the engine warmer is selected, the blower 7 may be stopped. Further, in step 114, the blowing temperature Ta is 40°.
Although it has been determined whether the temperature is above 40°C, other values may be used instead of 40°C. Furthermore, a flow rate control valve 25 is controlled. In addition to the electromagnetic valve 27, the rotation speed of the motor of the blower 7 may be added to switch linearly or stepwise. Further, instead of the temperature sensor 17, a thermocouple may be used for feedback control.

〔Effect of the invention〕

As explained above, according to the present invention, an excellent effect is achieved in that both immediate heating and engine warm-up can be switched in one system.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a flowchart showing arithmetic processing in the microcomputer of the above embodiment. ■... Heat storage tank, 5... Heater core, 11... Engine. 25...Flow rate control valve, 27...Solenoid valve.

Claims (1)

[Scope of Claims] A heating system for an automobile that uses engine cooling water as a heat source, comprising: a heating radiator provided between a cooling water inlet and an engine cooling water outlet; a heat storage tank provided between the heat storage tank for storing heat of the engine cooling water; a flow control valve for controlling the flow rate of the engine cooling water flowing into the heat storage tank; and the engine cooling water flowing into the heating radiator. and a switching valve for switching whether the engine cooling water flows in from the engine or through the heat storage tank, and when the temperature of the engine cooling water is higher than a predetermined temperature, the switching valve switching so that water flows from the engine to the heating radiator, and when the temperature of the engine cooling water is below the predetermined temperature, the switching valve is switched so that the engine cooling water flows through the heat storage tank to the heating radiator; switch so that it flows into the radiator,
and during heating, the amount of engine cooling water flowing into the heating radiator via the heat storage tank is less than a predetermined amount;
A heating system for a vehicle, characterized in that when warming an engine, the amount of engine cooling water flowing into the heating radiator via the heat storage tank is increased to a predetermined amount.