JP2003072355A - Heating device for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To support the starting of immediate effectivity in a cold starting of an engine 1. SOLUTION: A combustion heater 9 is connected to the upstream side of the engine 1 of a cooling water circuit R and, when an intake air temperature K is lower than a prescribed temperature T in starting the engine 1 and a cooling water temperature S is higher than the prescribed temperature T, ECU 30 operates a ventilation fan 27. When there is the cooling water higher than the prescribed temperature T in the combustion heater 9, the low-temperature intake air in an intake pipe 3 is incorporated by operating the ventilation fan 27 and its heat is exchanged with the high-temperature cooling water by a heat exchanger 25 in the combustion heater 9 and fed to the intake pipe 3 as the heated intake air. This constitution can facilitate ignition of atomized fuel in a cylinder so as to facilitate the starting of the engine 1. This device can quickly heat by using the high-temperature cooling water in the combustion heater 9 so as to shorten the time for starting the engine 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle heating system that utilizes exhaust gas, that is, combustion gas, generated in a combustion chamber of a combustion type heater as an engine starting aid.

[0002]

2. Description of the Related Art As prior art, Japanese Patent Laid-Open No. 63-7141
There is a technique disclosed in Japanese Patent Publication No. This is to connect the intake and exhaust pipes of a combustion type heater (combustion type heater) that heats the engine cooling water with the heat of burning fuel to the engine intake pipe to heat the engine cooling water and intake air It improves the starting performance at the time of starting.

[0003]

However, the effect of such combustion type heating is obtained only after the combustion type heater is burned, and first, in order to ignite, the glow plug is energized and preheated. Since it starts, there is a problem that it takes time to start the engine.

Further, there is provided a vehicle heating device having a heat accumulator (heat storage means) for storing high-temperature cooling water in a cooling water circuit and capable of heating the interior of the vehicle even when the cooling water temperature is low immediately after the engine is started. In a vehicle equipped with it, there is also a method of heating the cylinder block of the engine by supplying the hot water stored in the heat accumulator to the engine at the time of cold start as another engine start assist, but since the cylinder block has a large heat capacity, it is stored. Heating with warm water has little effect on improving startability.

The present invention has been made in view of the above-mentioned problems of the prior art, and an object thereof is to provide a vehicle heating device capable of providing effective and immediate starting assistance during cold starting of an engine. To provide.

[0006]

In order to achieve the above object, the present invention employs the following technical means.

According to the first aspect of the invention, the combustion heater (9) is connected upstream of the engine (1) in the cooling water circuit (R), and the control means (30) starts the engine (1). When the intake air temperature (K) is lower than the predetermined temperature (T) and the cooling water temperature (S) is higher than the predetermined temperature (T), the blower means (27) is operated.

The combustion heater (9) is connected to the cooling water circuit (R).
If the intake air temperature (K) is lower than the predetermined temperature (T) when the engine (1) is started and the cooling water temperature (S) is higher than the predetermined temperature (T). It is characterized in that the blowing means (27) is activated when the temperature is high.

This is because at the cold start of the engine (1),
When cooling water having a temperature higher than the predetermined temperature (T) is present in the combustion heater (9), the blower means (27) of the combustion heater (9) is operated to cause the intake pipe (3). The low-temperature intake air taken in is heat-exchanged with high-temperature cooling water in the heat exchanger (25) in the combustion type heater (9), and is sent to the intake pipe (3) as heated intake air.

As a result, the fuel atomized in the cylinder is easily ignited, and the startability of the engine (1) is improved.
Further, since the cooling water having a high temperature remaining in the combustion type heater (9) is used, it can be heated immediately and the time until the engine is started can be shortened.

According to the second aspect of the present invention, the combustion type heater (9) is connected upstream of the engine (1) of the cooling water circuit (R), and the high temperature cooling is provided upstream of the combustion type heater (9). A heat storage means (11) for storing water is connected to the control means (30).
Is the intake air temperature (K) when starting the engine (1)
Is lower than the predetermined temperature (T), the hot water stored in the heat storage means (11) is supplied to the engine (1) via the combustion type heater (9).

As a result, when the engine (1) is cold-started, the engine (1) is warmed by the hot water stored in the heat storage means (11) to improve the startability, and the combustion heater is heated by the hot water. The heat exchanger (25) in (9) is also preheated, and the rise in exhaust temperature (heating of intake air) after ignition of the combustion heater (9) can be accelerated.

According to the invention of claim 3, the control means (3
0) means the heat storage means (1) when the intake air temperature (K) is lower than the predetermined temperature (T) when the engine (1) is started.
The hot water stored in 1) is supplied to the engine (1) via a combustion type heater (9) and the blower means (27) is operated.

When the intake air temperature (K) is lower than the predetermined temperature (T) when starting the engine (1), the heat storage means (1)
The hot water stored in 1) is supplied to the engine (1) via the combustion type heater (9) and the air blowing means (27).
Is operated.

This is because, in addition to the supply of hot water according to claim 2, the blower means (27) is operated to preheat the engine (1), and the low-temperature intake air taken in from the intake pipe (3) is supplied. The heat exchanger (2 in the combustion heater (9)
In 5), heat is exchanged with hot water, and it is sent to the intake pipe (3) as heated intake air. This facilitates ignition of atomized fuel in the cylinder, improving the startability of the engine (1).

Further, since the hot water stored in the heat storage means (11) is used, it can be heated immediately and the heat exchanger (2
Since 5) is preheated with hot water and the rise in exhaust temperature after ignition (heating of intake air) can be accelerated, the time until the engine is started can be shortened.

In a fourth aspect of the invention, the control means (3
0) means the heat storage means (1) when the intake air temperature (K) is lower than the predetermined temperature (T) when the engine (1) is started.
When supplying the hot water stored in 1) to the engine (1) via the combustion type heater (9), the operation of the water transmitter (7) is stopped under a predetermined operating condition.

This is because when the hot water supply device (7) is continuously operated to supply the hot water according to the second aspect, the heat storage means (1
This is because the hot water discharged from 1) passes through the inside of the combustion heater (9) and the inside of the engine (1), and the temperature of the cooling water for these portions to be heated again drops.

Therefore, as a predetermined operating condition, the hot water discharged from the heat storage means (11) stops the operation of the water transmitter (7) at a predetermined time to fill the combustion heater (9) and the engine (1). Alternatively, the heat storage water temperature detection means (14) such as a water temperature sensor for detecting the water temperature at the hot water outlet of the heat storage means (11)
Accordingly, the operation of the water transmitter (7) may be stopped by detecting that the hot water stored in the heat storage means (11) has run out and the water temperature has dropped.

As a result, in the combustion type heater (9) which is the portion to be heated by the hot water supplied from the heat storage means (11),
And the heat exchanger (25) in the engine (1), the combustion heater (9), since it is supplied and stays in the engine (1),
In addition, the exhaust temperature can be raised (heat of intake air) efficiently.

In the invention according to claim 5, the control means (3
0) is characterized by energizing the glow plug (23) when the intake air temperature (K) is lower than a predetermined temperature (T) when the engine (1) is started.

This is because when the engine (1) is cold started,
Whether or not the combustion heater (9) is activated,
When operating the blower means (27), the glow plug (2
3) is also energized to generate heat, so that the low-temperature intake air taken in from the intake pipe (3) passes through the combustion heater (9) not only from the heat exchanger (25) but also to the glow plug. It is also heated by (23) and sent to the intake pipe (3) as intake air of higher temperature.

As a result, the fuel atomized in the cylinder is more easily ignited and the startability of the engine (1) is improved. Incidentally, the reference numerals in parentheses of the above-mentioned respective means are examples showing the corresponding relationship with the concrete means described in the embodiments described later.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, embodiments of the present invention will be described with reference to the drawings.

(First Embodiment) FIG. 1 is a schematic configuration diagram of a vehicle heating device according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a water-cooled diesel engine (liquid-cooled internal combustion engine) for vehicle running, and 3 is a water-cooled diesel engine (hereinafter referred to as engine) that is air whose dust has been removed (purified) by an air cleaner 2. Is abbreviated.), And 4 is an exhaust pipe that collects and exhausts exhaust gas discharged from each cylinder.

Reference numeral 5 is a radiator for cooling the cooling water (cooling liquid) circulating in the engine 1, and 7 is an electric water pump (water transmitter) for circulating the cooling water in the cooling water circuit R by the driving force of the motor. ). B is a bypass circuit that circulates the cooling water flowing out of the engine 1 to the radiator 1 by bypassing the radiator 5, and 8 is a case where the cooling water flowing out of the engine 1 is circulated to the radiator 5 in accordance with the cooling water temperature. This is a well-known thermostat that switches between the case of circulating the bypass circuit B and the case of circulating the bypass circuit B.

Incidentally, switching between the two hot water circuits is usually
When the hot water temperature is 80 ° C. or higher, it is controlled to flow to the radiator 5, and when it is 80 ° C. or lower, it is controlled to flow to the bypass circuit 7. The bypass passage B is usually built in the engine 1.

Reference numeral 6 denotes a heater core (hot water heater) that heats the air blown into the passenger compartment by using cooling water as a heat source, and 9 is disposed downstream of the heater core 6 in the cooling water flow. Is a combustion type heater (combustion type heater) that heats the cooling water flowing out from the heater core 6.
The details of the combustion heater 9 will be described later.

Then, the occupant operates the combustion state of the combustion type heater 9 (stopping, ignition or heat generation amount of the combustion type heater 9), the fuel pump 21 for feeding fuel to the combustion type heater 9 under pressure, and the electric water pump 7. Timer switch (not shown) or remote control device (not shown)
Set values such as, intake air temperature sensor 10, cooling water temperature sensor 2
It is controlled by an electronic control unit (ECU) 30 which is a control means based on the detection signal (detection temperature) of 6.

Incidentally, 10 is an intake air temperature sensor (intake air temperature detecting means) for detecting the intake air temperature K in the intake pipe 3 of the engine 1, and 26 is a cooling water temperature sensor for detecting the cooling water temperature S in the combustion heater 9. (Cooling water temperature detection means). Reference numeral 28 is a heater intake pipe that takes in the air purified by the air cleaner 2 from the intake pipe 3 of the engine 1 and takes it into the combustion heater 9. Reference numeral 29 is the combustion gas after combustion to the intake pipe 3 of the engine 1. It is a heater exhaust pipe to send in.

Next, the combustion heater 9 will be described.

FIG. 2 is a schematic sectional structural view of the combustion heater 9. The liquid fuel supplied from the fuel pump 21 through the fuel pipe 21 a is supplied to the wick 22. The wick 22 is made of a metal mesh composed of a large number of holes, and promotes vaporization of the fuel by temporarily holding the fuel in the large number of holes. Reference numeral 23 denotes a glow plug (ignition means) for heating the fuel to a temperature higher than the ignition temperature to ignite the fuel, and after energizing for a predetermined time (about 30 to 60 seconds) to heat the peripheral wall surface of the glow plug 23 and the wick 22. The fuel is ignited and burned by supplying the fuel to the 24 combustion chambers.

Combustion air is blown to the combustion chamber 24 where the fuel is burned by a blower fan (blowing means) 27 driven by an air motor 27a. The combustion air passes from the intake pipe 3 of the engine 1 through the heater intake pipe 28 to the combustion heater 9
Is mixed with vaporized fuel and burned in a cylindrical combustion cylinder 22a provided in the combustion chamber 24, and a space between the outside of the combustion cylinder 22a and the inside of the heat exchanger 25 is generated. As described above, the gas is exhausted from the heater exhaust pipe 29 into the intake pipe 3 of the engine 1. Incidentally, during steady combustion, a continuous amount of gas is vaporized by the radiant heat of the flame.

Reference numeral 25 is a heat exchanger for heating the cooling water with the heat of burning the fuel. After the cooling water flows in from the cooling water inlet of 25a and exchanges heat, it flows out from the cooling water outlet of 25b. Circulate. Incidentally, 26 is a water temperature sensor (cooling water temperature detecting means) for detecting the cooling water temperature S in the combustion heater 9.

Next, the operation of the vehicle heating system including the ECU 30 of this embodiment when the engine 1 is started will be described with reference to the flow chart of FIG. When the engine 1 is to be started, first in step S1, the temperature K of the air that the engine 1 is about to inhale is determined from the detection signal (detection temperature) of the intake temperature sensor 10 in the intake pipe 3 of the engine 1.
However, it is determined whether the temperature is lower than the predetermined temperature T, that is, a so-called cold start condition.

If the intake air temperature K is equal to or higher than the predetermined temperature T, the starting assistance is unnecessary and the normal engine starting is performed. However, if the intake air temperature K is lower than the predetermined temperature T, cold starting is required to start the engine, and the process proceeds to step S2.

In step S2, it is determined from the detection signal (detection temperature) of the cooling water temperature sensor 26 in the combustion heater 9 whether the cooling water temperature S in the combustion heater 9 is higher than the predetermined temperature T. To judge.

If the cooling water temperature S is higher than the predetermined temperature T, it is determined that the starting assistance can be immediately performed in step S.
3, the blower fan 27 (air motor 27a) in the combustion heater 9 is operated. However, the cooling water temperature S
If the temperature is lower than or equal to the predetermined temperature T, it is determined that the starting assistance cannot be performed immediately, and the process proceeds to step S4, and the operation of the combustion heater 9 is started as the starting assistance during the normal cold starting. is there.

Next, the features and effects of this embodiment will be described. As described above, the combustion heater 9 is connected upstream of the engine 1 in the cooling water circuit R, and when the intake air temperature K is lower than the predetermined temperature T when the engine 1 is started, and the cooling water temperature S is predetermined. When the temperature is higher than the temperature T, the blower fan 27 is operated.

This is because when the engine 1 is cold-started and the cooling water having a temperature higher than the predetermined temperature T is present in the combustion heater 9, the blower fan 27 of the combustion heater 9 is actuated to intake air. The low-temperature intake air in the pipe 3 is taken in, the heat exchanger 25 in the combustion heater 9 exchanges heat with the high-temperature cooling water, and the heated intake air is sent to the intake pipe 3.

As a result, the fuel atomized in the cylinder is easily ignited, and the startability of the engine 1 is improved. Further, since the cooling water having a high temperature remaining in the combustion heater 9 is used, it can be heated immediately and the time until the engine 1 is started can be shortened.

(Second Embodiment) FIG. 4 is a schematic configuration diagram of a vehicle heating device according to a second embodiment of the present invention. The difference from the first embodiment is that in the cooling water circuit R, further upstream of the combustion heater 9 connected upstream of the engine 1,
This is a configuration in which a heat retention tank (heat storage means) 11 that stores high-temperature cooling water is connected.

The heat-retaining tank 11 has an adiabatic double structure for storing high-temperature engine cooling water that has deprived the engine 1 of heat, and has a capacity of 3 liters in the embodiment. Incidentally, when the vehicle heating device according to the present embodiment is assembled in a vehicle, the heat insulation tank 11 is assembled in the vehicle compartment side of the engine compartment. Further, a bypass circuit 13 that bypasses the heat retention tank 11 is provided.

A switching valve 12 for switching between the inflow circuit flowing into the heat retaining tank 11 and the bypass circuit 13.
Is provided at the branch point of both hot water circuits. In the present embodiment, the switching valve 12 is an electric switching valve that operates a valve element by an electric actuator, and has a flow rate adjusting mechanism as well as switching of the hot water circuit. The switching valve 12 is controlled by the ECU 30. ing. In addition, 14 is
It is a water temperature sensor (heat storage water temperature detection means) that detects the water temperature at the hot water outlet flowing out from the heat retention tank 11.

Next, the operation of the vehicle heating system including the ECU 30 of this embodiment when the engine 1 is started will be described with reference to the time chart of FIG. When the engine 1 is to be started, first, from the detection signal (detection temperature) of the intake air temperature sensor 10 in the intake pipe 3 of the engine 1, the temperature K of the air which the engine 1 is about to inhale is determined to be a predetermined temperature T. It is the same as in the first embodiment to determine whether the situation is lower than that, that is, a so-called cold start situation.

Therefore, if the intake air temperature K is equal to or higher than the predetermined temperature T, the start assist is not necessary and the normal engine start is performed. However, if the intake air temperature K is lower than the predetermined temperature T, the following operation is performed because cold start is required to start the engine.

First, as shown in FIGS. 5 (a), 5 (b) and 5 (e), the switching valve 12 is set to the heat retaining tank (heat accumulator) 11 side, and the water pump 7 is operated for a predetermined condition depending on time or temperature. The hot water in the heat insulation tank 11 is heated by the combustion heater 9
At the same time that the air is supplied to the engine 1, the blower fan 27 in the combustion heater 9 is operated.

As a result, the engine 1 is preheated by the stored hot water, and at the same time, the blast air is heated by the heat exchanger 25 of the combustion heater 9, and the exhaust gas from the combustion heater 9 is exhausted as shown in FIG. 5 (f). The temperature rises, and this is sent to the intake pipe 3 as intake air for the engine 1.

At the same time, as shown in FIG. 5 (g), a glow plug for starting the engine 1 and FIG. 5 (c) are used.
The glow plug 23 for igniting the combustion heater 9 as shown in FIG.
Preheat. As shown in FIGS. 5 (a), 5 (d), and 5 (e), the combustion heater 9 supplies fuel from the fuel pump 21 to start ignition when the preheating progresses, the fuel supply amount and the blower fan 27. The water pump 7 is operated again at the same time as the amount of air blown is increased.

As a result, the combustion heat is used to advance the preheating of the engine 1 by heating the engine intake air and heating the cooling water. As shown in FIG. 5 (g), the engine 1 performs cranking at the time when the preheating of the glow plug is completed while the preheating is being performed, and the engine 1 is satisfactorily started.

Next, the features and effects of this embodiment will be described. As described above, the combustion type heater 9 is connected to the upstream side of the engine 1 in the cooling water circuit R, and the heat insulation tank 11 for storing high temperature cooling water is connected to the upstream side of the combustion type heater 9 to start the engine 1. When the intake air temperature K is lower than the predetermined temperature T, the hot water stored in the heat insulation tank 11 is supplied to the engine 1 via the combustion heater 9. At that time, the blower fan 27 is operated.

This is because when the engine 1 is cold started, the engine 1 is warmed up by the warm water stored in the heat insulation tank 11 to be preheated, and the low temperature intake air taken in from the intake pipe 3 is a combustion type heater. The heat exchanger 25 in 9 exchanges heat with hot water, and the heated intake air is sent to the intake pipe 3.
As a result, the atomized fuel in the cylinder is easily ignited, and the startability of the engine 1 is improved.

Further, since the hot water stored in the heat retaining tank 11 is used, it can be heated immediately, and the heat exchanger 25 is preheated by the hot water, and the exhaust temperature rises after the ignition of the combustion heater 9 (heating of intake air). Therefore, the time until the engine is started can be shortened.

The above-mentioned supply of hot water stops the operation of the water pump 7 under a predetermined operating condition. As a result, the hot water supplied from the heat insulation tank 11 is supplied and stays in the combustion heater 9 and the engine 1 which are the portions to be heated, so that the engine 1, the heat exchanger 25 in the combustion heater 9 and the exhaust gas are discharged. It is possible to efficiently raise the temperature (heat the intake air).

The glow plug 23 is energized when the blower fan 27 is operated under the above conditions. This is because when the engine 1 is cold started, the glow plug 23 is energized to generate heat when the blower fan 27 is actuated, regardless of whether the combustion heater 9 is actuated. The intake air is heated by the glow plug 23 as well as from the heat exchanger 25 when passing through the combustion heater 9, and is sent to the intake pipe 3 as intake air of a higher temperature.

(Other Embodiments) The present invention is not limited to the above-described embodiments, but can be modified or expanded as follows. In the above embodiment,
The necessity of starting assistance by cold starting is determined by the intake air temperature K in the intake pipe 3, but the invention is not limited to this. For example, the temperature of the cooling water in the engine 1 or the front of the vehicle may be detected. The determination may be made based on the outside air temperature or the like.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a vehicle heating device according to a first embodiment of the present invention.

FIG. 2 is a schematic sectional structural view of a combustion heater.

FIG. 3 is a flowchart when the engine is started in the vehicle heating device of FIG.

FIG. 4 is a schematic configuration diagram of a vehicle heating device according to a second embodiment of the present invention.

5 is a time chart when the engine is started in the vehicle heating system of FIG.

[Explanation of symbols]

1 engine 3 intake pipe 6 Heater core (hot water heater) 7 Water pump (water transmitter) 9 Combustion heater (combustion heater) 10 Intake air temperature sensor (intake air temperature detecting means) 11 Thermal insulation tank section (heat storage means) 23 glow plug 26 Cooling water temperature sensor (cooling water temperature detecting means) 27 Blower fan (Blower means) 30 electronic control device (control means) R cooling water circuit K Intake air temperature S Cooling water temperature T predetermined temperature

Claims (5)

[Claims] 1. A hot water heater (6) which is connected to a cooling water circuit (R) of a water cooling type engine (1) and heats air which is supplied with cooling water and blows into a vehicle interior, the cooling water. A combustion type heater (9) which is connected to a circuit (R) and heats cooling water by the heat of burning fuel; and an intake air temperature (K) in the intake pipe (3) of the engine (1) is detected. Intake air temperature detecting means (10), cooling water temperature detecting means (26) for detecting the cooling water temperature (S) in the combustion type heater (9), the intake air temperature detecting means (10) and the cooling water temperature Control means for controlling the circulation of the cooling water circuit (R) and the combustion type heater (9) based on the detection information of the intake air temperature (K) and the cooling water temperature (S) from the detection means (26) ( Three
0) and the combustion type heater (9) has a built-in blower means (27).
In the vehicle heating device for taking in combustion air from the intake pipe (3) and sending the combustion gas after combustion to the intake pipe (3) by the operation of the combustion type heater (9), R) is connected to the upstream side of the engine (1), and the control means (30) cools when the intake air temperature (K) is lower than a predetermined temperature (T) when the engine (1) is started. A heating device for a vehicle, wherein the air blowing means (27) is operated when the water temperature (S) is higher than the predetermined temperature (T). 2. A hot water type heater (6) which is connected to a cooling water circuit (R) of a water cooling type engine (1) and heats air which is supplied with the cooling water and blows into the passenger compartment, A combustion type heater (9) which is connected to a circuit (R) and heats cooling water by the heat of burning fuel; and an intake air temperature (K) in the intake pipe (3) of the engine (1) is detected. Intake air temperature detecting means (10), and intake air temperature (K) from the intake air temperature detecting means (10)
And a control means (30) for controlling the circulation of the cooling water circuit (R) and the combustion type heater (9) based on the detection information of the combustion type heater (9). (27)
In the vehicle heating device that takes in combustion air from the intake pipe (3) and sends the combustion gas after combustion to the intake pipe (3) by the operation of the above, upstream of the engine (1) of the cooling water circuit (R). The heat storage means (11) for connecting the combustion type heater (9) to the above and storing high temperature cooling water upstream of the combustion type heater (9).
When the intake air temperature (K) is lower than a predetermined temperature (T) when the engine (1) is started, the control means (30) connects the hot water stored in the heat storage means (11). A heating system for a vehicle, characterized in that it is supplied to the engine (1) via the combustion type heater (9). 3. The control means (30) stores in the heat storage means (11) when the intake air temperature (K) is lower than the predetermined temperature (T) when starting the engine (1). Hot water is supplied to the engine (1) via the combustion heater (9) and the blower means (27).
The vehicle heating device according to claim 2, wherein the heating device is operated. 4. The control means (30) stores in the heat storage means (11) when the intake air temperature (K) is lower than the predetermined temperature (T) when starting the engine (1). 4. When supplying hot water to the said engine (1) via the said combustion type heater (9), operation | movement of a water feeder (7) is stopped on a predetermined operating condition, The claim 2 or claim 3 characterized by the above-mentioned. The heating system for a vehicle according to. 5. The control means (30) energizes a glow plug (23) when the intake air temperature (K) is lower than the predetermined temperature (T) when starting the engine (1). The vehicle heating device according to any one of claims 1, 3, and 4.