JP3061665B2 - Combustion heating system for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion type heating apparatus for a vehicle, and more particularly to an auxiliary heating mode for operating a combustion type heater when the engine is driven, and a timer for operating the combustion type heater at a time set by a timer when the engine is stopped. The present invention relates to a combustion heating device for a vehicle having a reserved heating mode.

[0002]

2. Description of the Related Art As a conventional combustion-type heating device for a vehicle, for example, a device for heating a vehicle interior using engine cooling water as a heat source, a blower disposed in a duct and a downstream side of the blower in the duct. A heater core that is disposed and uses the engine cooling water as a heat source; a combustion heater that is disposed in the middle of a pipe that guides the engine cooling water from the engine water jacket to the heater core and that heats the engine cooling water; and controls the operation of the heater. An electronic control unit for operating the combustion type heater when the operation switch for heater operation is turned on when the engine is driven, and a combustion mode when the operation switch is turned on when the engine is stopped. A nap heating mode in which the heater is activated, and a tie-down heater in which the combustion heater is activated at a time set by a timer when the engine is stopped. What is controllable and reservation heating mode it has been proposed by the present applicant (Japanese Patent Application No. 3
141306). In the timer reservation heating mode, when the engine is stopped, the combustion type heater is operated at the time set by the timer, so that the engine coolant is heated only by the heater, and the heated engine coolant is supplied to the heater core in the duct. Sent.

[0003]

In the above prior art, the original purpose of the timer reservation heating mode is to warm the passenger compartment in advance in winter before the occupant gets on the vehicle. Operating the blower,
The air blown by the blower is heated and exchanged by a heater core that receives the engine cooling water heated by the combustion type heater, and the warm air is blown out from the outlet of the duct into the vehicle interior to warm the vehicle interior. It has become.
However, if this timer reservation heating mode is performed when the outside air temperature is extremely low (for example, at about 0 ° C.), especially when the outside air introduction mode is set, the cool air (outside air)
Is sent to the heater core by the blower, the amount of heat radiated by the heater core becomes very large, and the temperature of the engine cooling water does not rise to about 25 ° C. or more at about 30 minutes after the start of the timer reserved heating mode. Would. As a result, in the timer reservation heating mode, the temperature of the air blown into the vehicle compartment only rises to about 15 ° C. at the most, so that the passenger compartment is preliminarily heated to a comfortable temperature (for example, about 25 ° C.) before the occupant gets on. In addition, there is a problem that the passenger feels cold when the occupant gets on the vehicle in a state where the air of about 15 ° C. is blowing into the passenger compartment.

Further, in the above-mentioned prior art, as described above, since the blower is operated during the timer reservation heating mode, there is also a problem that the power consumption is large.

The present invention has been made in view of such conventional problems, and provides a combustion heating device for a vehicle which improves a heating effect and reduces power consumption during timer reservation heating. It is intended to be.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides an apparatus for heating a vehicle interior using engine cooling water as a heat source, comprising: a blower disposed in a duct;
A heat exchanger that is disposed downstream of the blower in the duct and uses the engine cooling water as a heat source, and is disposed in the middle of a pipe that guides the engine cooling water from the water jacket of the engine to the heat exchanger. A combustion type heater for heating, and an electronic control unit for controlling the operation of the heater, the electronic control unit is an auxiliary heating mode for operating the combustion type heater when the operation switch for heater operation is turned on when the engine is driven, In the vehicle combustion type heating device capable of controlling the timer reservation heating mode for operating the combustion type heater at the time set by the timer when the engine is stopped, the electronic control unit sets the timer reservation heating mode to the blower. This is configured to be performed in a stopped state.

[0007]

Since the electronic control unit is configured to perform the timer reservation heating mode while maintaining the blower in a stopped state, the electronic control unit performs the timer reservation heating mode in the outside air introduction mode when the outside air temperature is extremely low. Even so, the cool air (outside air) is not sent to the heat exchanger by the blower, and the amount of heat radiation in the heat exchanger is extremely small. For this reason, the temperature of the engine cooling water is sufficiently raised by the combustion-type heater that starts operating in the timer reservation heating mode, and the high-temperature engine cooling water is sent to the heat exchanger. When the occupant gets on the vehicle in this state, the cabin is not warmed up yet. However, if the blower is operated after the occupant gets on, warm air is immediately blown into the cabin, so that the cabin is quickly warmed to a comfortable temperature.

[0008]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a combustion-type heating device for a vehicle according to one embodiment. The heating device includes a hot-water-type combustion heater 1, an air conditioner 2, and an electronic control unit (hereinafter referred to as "ECU"). 3, an operation unit 4, a pipeline 5, and the like.

The combustion type heater 1 comprises a combustor 6 and a heat exchanger 7
It is composed of The combustion type heater 1 includes a glow plug 8, a fuel pump 9 for supplying liquid fuel from a fuel tank 12 to a wick in a combustor 6, a vortex blower 10 for pressure-feeding combustion air into a combustion chamber of the combustor 6, and A heater-side water pump 11 for pumping the engine cooling water from the pipe line 5 to a fluid passage 13 in the heat exchanger 7 is mounted.

A fuel pump 9, a motor of a vortex blower 10,
The motor of the water pump 11 on the heater side is electrically connected to the ECU 3, and the fuel supply amount, the combustion air blowing amount,
And the water supply pressure of engine cooling water is controlled. The glow plug 8 is also electrically connected to the ECU 3,
The control signal from U controls the application of the necessary voltage at the time of ignition.

At the upstream end of the duct 14 of the air conditioner 2, an inside / outside air switching door 15 is provided.
A blower 16 is provided downstream of the evaporator 17, an evaporator 17 is provided downstream of the blower 16, and a heater core (heat exchanger) 18 is provided downstream of the evaporator 17. An air mix door 19 is rotatably provided between the heater core 18 and the evaporator 17. On the downstream side of the heater core 18, blow-out mode switching doors 20 and 2 are provided.
A face outlet 22, a defroster outlet 23, and a foot outlet 24 are provided, which are opened and closed by the switching of No. 1 respectively. The blower motor 16a of the blower 16 is also electrically connected to the ECU 3, and the amount of air blown by the blower 16 is controlled by a control signal from the ECU.

The conduit 5 is a flow path for circulating engine cooling water between the water jacket 25 of the engine E and the heater core 18 via the combustion type heater 1. The pipe 5 connects the water jacket 25 of the engine E to the cooling water inlet of the water pump 11 on the heater side, and the pipe connects the cooling water outlet 26 of the combustion heater 1 to the inlet of the heater core 18. 5b, and a pipe 5c connecting the outlet of the heater core 18 and the water jacket 25. Also, the engine E
An engine-side water pump 80 for circulating the engine cooling water heated by the engine E in the pipe line 5 at the time of driving is provided.

As shown in FIGS. 1 and 2, the ECU 3 is electrically connected to an operation unit 4 disposed on an instrument panel in a vehicle compartment. This operation unit 4
A heater operation switch 41 for operating the combustion type heater 1, a timer setting unit 42 for setting a time for operating the combustion type heater 1 when the engine is stopped, and a timer setting time display unit 43 for displaying the set time. Is provided. The operation unit 4 outputs to the ECU 3 an ON / OFF switch signal from the operation switch 41 and a timer signal indicating the time set by the timer setting unit 42. As shown in FIG. 2, each power supply terminal of the ECU 3, the fuel pump 9, the vortex blower 10, and the water pump 11 is connected to the positive side of the battery 70. A power terminal of the blower motor 16a, which is not shown in FIG. 2, is also connected to the positive side of the battery 70.

As described above, the ECU 3 includes the glow plug 8, the fuel pump 9, and the vortex blower 1 of the combustion type heater 1.
By outputting a control signal to each motor of 0 and the motor of the water pump 11 to control them,
From the ignition control of the combustion type heater 1 to the operation including the combustion control and the operation stop including the flame extinction control are controlled. Also, EC
U3 is a heater operation switch 4 when the engine is driven.
When the engine 1 is turned on, an auxiliary heating mode for operating the combustion type heater 1 to assist heating using the engine cooling water as a heat source, that is, to further heat the engine cooling water heated by the engine E, When the operation switch 41 for heater operation is turned on for the occupant to take a nap when the vehicle stops, the nap heating mode in which the combustion heater 1 is activated and when the engine is stopped, the combustion heater 1 is turned on at the time set by the timer setting unit 42. It is configured to execute a timer reservation heating mode to be activated.

As shown in FIG. 2, when the ignition switch 50 of the vehicle is at the ON position (ON position), the ECU 3 sets the ON signal line 61 and the ignition switch 5 to ON.
When the ignition switch 50 is in the ON position and the ACC position, the ON signal input terminal 3a connected to the plus side of the vehicle battery 70 via the ACC signal line 62
And the battery 70 via the ignition switch 50
And an ACC signal input terminal 3b connected to the plus side. That is, the ignition switch 50
Switchable between a start position (START position), an ON position (ON position), an ACC position, an OFF position (OF position), and a lock position (LOCK position), and the base end is connected to the positive side of the battery 70. Movable contact 51, 2
It is composed of two electrodes 52 and 53 and output lines 54 and 55 connected to the respective electrodes 52 and 53 to respective loads of the vehicle, and is a known switch mounted on a general vehicle. The electrode 52 has a shape such that the output line 54 is connected to the positive side of the battery 70 when the movable contact 51 is at the start position and the ON position, and the electrode 53 has a shape when the movable contact 51 is at the ON position and the ACC position. The output lines 55 are each formed in a shape to be connected to the positive side of the battery 70. One end of the ON signal line 61 is connected to the output line 54, the other end is connected to the ON signal input terminal 3a of the ECU 3, the one end of the ACC signal line 62 is connected to the output line 55, and the other end is connected to the ACC signal input terminal 3b of the ECU 3. It is connected.

The ECU 3 is connected to both input terminals 3
When the signals a and 3b are connected to the positive side of the battery 70, that is, when the ON signal (High level signal) and the ACC signal (High level signal) are input to both input terminals 3a and 3b, respectively. When the operation mode is determined to be the auxiliary heating mode, the combustion type heater 1 is operated from the time when the operation switch 41 is turned on until the time when the operation switch 41 is turned off, and only the ACC input terminal 3b is connected to the plus side, that is, AC
When the ACC signal is input only to the C input terminal 3b, it is determined that the nap mode is set, and the first predetermined operation time (for example, 3 hours) after the operation switch 41 is turned on.
When the combustion type heater 3 is operated, and the ignition switch 50 is in the off position or the locked position, and both input terminals 3
a and 3b are disconnected from the positive side, that is, an ON signal and an ACC signal are applied to both input terminals 3a and 3b.
When the signal is not input, it is determined that the timer is in the reserved heating mode, and the second predetermined operation time (for example, one hour) shorter than the first predetermined operation time from the time set by the timer setting unit 42 is a combustion type. The heater 1 is configured to operate. Note that the first and second predetermined operation times are stored in a memory built in the ECU 3.

The ECU 3 is configured to perform the timer reservation heating mode while keeping the blower 16 stopped.

Further, when the auxiliary heating mode is performed, the engine E is driven and the engine cooling water circulates in the pipe 5 by the water supply pressure of the water pump 80 on the engine side. The mode is configured to be performed while the water pump 11 on the heater side is stopped.

Next, the operation of the combustion heating system for a vehicle having the above-described configuration will be described.

FIGS. 3 and 4 are flow charts showing the control program stored in the ECU 3, which are connected at points A, B and C.

When the ECU 3 is started and its control program is started, first, in step 301, it is determined whether or not the timer is set, that is, whether or not the time is set by the timer setting unit 42. This answer is affirmative (Ye
s), the process proceeds to step 302, where it is determined whether or not the ACC signal is input, that is, the ACC signal (High
Level signal) is input. When the answer is affirmative (Yes), the process proceeds to step 310 described later, and when the answer is negative (No), the process proceeds to step 303. In this step 303, it is determined whether or not an ON signal is input, that is, whether or not an ON signal (High level signal) is input to the ON signal input terminal 3a. When the answer is negative (No), that is, when the ignition switch 50 is in the off position or the lock position and both input terminals 3a and 3b are disconnected from the positive side of the battery 70, the process proceeds to step 304. Then, the timer reservation heating mode is determined and the timer reservation heating is executed. That is, in step 304, the timer setting unit 42
The ignition control of the combustion type heater 1 is performed at the time set by (1) to start its operation, and after this start, the combustion control is executed. After this start, the process proceeds to step 305, where blower 1
6 is stopped. As described above, the ECU 3 performs the timer reservation heating mode while maintaining the blower 16 in the stopped state.

After the execution of step 305, step 3
Proceeding to 06, it is determined whether or not a second predetermined operation time (for example, one hour) has elapsed from the time set by the timer setting unit 42. At this time, since it is immediately after the timer reservation heating is started, the answer in step 306 is negative (No).
And the process returns to the step 302. While the answers of steps 302 and 303 are both negative (No), the blower 16 is operated until the answer of step 306 becomes affirmative (Yes), that is, until the second predetermined operation time elapses.
Is maintained in the stopped state, the timer reserved heating mode is continued. If the second predetermined operation time elapses during the timer-reserved heating, the answer to step 306 becomes affirmative (Yes), and the routine proceeds to step 307, where the operation in the timer-reserved heating mode is stopped and terminated.

If the answer to step 301 is negative (No), the process proceeds to step 308, where it is determined whether the operation switch 41 is on. If the answer to step 308 is affirmative (Ye
If s), the process proceeds to step 309, and if the answer to step 308 is negative (No), the process proceeds to step 307 to keep the operation of the combustion type heater 1 stopped. In step 309, it is determined whether or not an ACC signal is input as in step 302. If the answer is affirmative (Yes), the process proceeds to step 310, and if the answer is negative (No), the process proceeds to step 307 to keep the operation of the combustion heater 1 stopped. In step 310, as in step 303, it is determined whether or not an ON signal has been input. This answer is affirmative (Y
es), that is, when the ignition switch 50 is in the ON position and the input terminals 3a and 3b are connected to the positive side of the battery 70, step 311
To determine that the mode is the auxiliary heating mode, and execute the auxiliary heating. That is, in step 311, ignition control of the combustion type heater 1 is performed to start its operation, and after this start, combustion control is executed. After this, step 3
Proceeding to 13, the water pump 11 on the heater side is kept stopped. In this way, the ECU 3 performs the auxiliary heating mode while keeping the heater-side water pump 11 stopped.

After execution of step 313, step 3
Proceeding to 15, it is determined whether or not the operation switch 41 is off. If the answer is negative (No), the step 309 is executed.
Return to Then, while the answers of steps 309 and 310 are both affirmative (Yes), the operation of the auxiliary heating mode is continued until the operation switch 41 is turned off and the answer of the step 315 becomes affirmative (Yes). . If the answer to step 315 is affirmative (Yes), the step 3
In step 07, the operation in the auxiliary heating mode is stopped and ended.

If the answer to step 310 is negative (No), that is, if the ignition switch 50
Is in the ACC position and only the ACC input terminal 3b is connected to the positive side of the battery 70,
It proceeds to 2 and determines the nap heating mode, and executes the nap heating mode. That is, in step 312, the ignition control of the combustion type heater 1 is performed and its operation is started, and after this start, the combustion control is executed. Then, step 31
Proceeding to 4, it is determined whether a first predetermined operation time (for example, 3 hours) has elapsed. If the answer is negative (No), the process proceeds to step 315. This answer is negative (No)
At this time, the process returns to step 309. While the answer of step 309 is affirmative (Yes) and the answer of step 310 is negative (No), the answer of step 314 becomes affirmative (Yes) after the first predetermined time has passed, or Before the first predetermined time elapses, the operation in the nap heating mode is continued until the operation switch 41 is turned off and the answer to the step 315 becomes affirmative (Yes). Step 3
The answer to 14 is affirmative (Yes) or step 315
If the answer is affirmative (Yes), the routine proceeds to the step 307, where the operation in the nap heating mode is stopped and ended.

As described above, according to one embodiment,
The ECU 3 performs the timer-reserved heating mode while maintaining the blower 16 in the stopped state. Therefore, even if the timer-reserved heating mode is performed in the outside air introduction mode when the outside air temperature is extremely low, the cool air (outside air) is blown. 16, the heat is not sent to the heater core 18, and the heat radiation amount in the heater core 18 is very small. For this reason, the temperature of the engine cooling water is raised to a high temperature of about 60 ° C. to 70 ° C. by the combustion type heater 1 started to operate in the timer reservation heating mode, and the high temperature engine cooling water is sent to the heater core 18.
When the occupant gets on the vehicle in this state, the cabin has not yet been warmed up. However, if the blower 16 is operated after the occupant gets on the vehicle, warm air is immediately introduced from the face outlet 22 and the foot outlet 24 of the duct 14 into the passenger compartment. Since the air blows out, the vehicle interior is quickly heated to a comfortable temperature. Thereby, the heating effect in the timer reservation heating mode is improved. Also, since the blower 16 is maintained in the stopped state during the timer-reserved heating mode, it is possible to reduce power consumption in the timer-reserved heating mode.

According to the above embodiment, the ECU 3
Performs the auxiliary heating mode while maintaining the heater-side water pump 11 in a stopped state, that is, without operating the heater-side water pump 11 and using only the water supply pressure of the engine-side water pump 11. Since the cooling water is circulated in the pipe 5, power consumption in the auxiliary heating mode can be reduced.

[0029]

As described above, according to the combustion heating system for a vehicle according to the present invention, the electronic control unit is configured to perform the timer reservation heating mode while maintaining the blower in the stopped state. Therefore, even if the timer reservation heating mode is performed in the outside air introduction mode when the outside air temperature is extremely low, the cool air (outside air) is not sent to the heat exchanger by the blower, and the amount of heat released by the heat exchanger is extremely low. Small. For this reason,
The temperature of the engine cooling water is sufficiently raised by the combustion-type heater that starts operating in the timer reservation heating mode, and the high-temperature engine cooling water is sent to the heat exchanger. When the occupant gets on the vehicle in this state, the cabin is not warmed up yet. However, if the blower is operated after the occupant gets on, warm air is immediately blown into the cabin, so that the cabin is quickly warmed to a comfortable temperature. Also, during the timer reservation heating mode, the blower is kept stopped. Therefore, it is possible to improve the heating effect and reduce the power consumption during the timer reservation heating.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram of a combustion heating device for a vehicle according to one embodiment of the present invention.

FIG. 2 is a configuration diagram illustrating a main part of a combustion-type heating device for a vehicle according to an embodiment of the present invention.

FIG. 3 is a flowchart illustrating a control program of an electronic control unit.

4 is a flowchart showing a control program of the electronic control unit, which is connected to the flowchart of FIG. 3 at points A, B and C.

[Explanation of symbols]

 E Engine 1 Combustion heater 3 ECU (Electronic control unit) 14 Duct 16 Blower 18 Heater core (Heat exchanger) 25 Water jacket 41 Heater operation switch 42 Timer setting unit (Timer)

Claims (1)

(57) [Claims] An apparatus for heating a vehicle interior using engine cooling water as a heat source, comprising: a blower disposed in a duct;
A heat exchanger that is disposed downstream of the blower in the duct and uses the engine cooling water as a heat source, and is disposed in the middle of a pipe that guides the engine cooling water from the water jacket of the engine to the heat exchanger. A combustion type heater for heating, and an electronic control unit for controlling the operation of the heater, the electronic control unit is an auxiliary heating mode for operating the combustion type heater when the operation switch for heater operation is turned on when the engine is driven, In the vehicle combustion type heating device capable of controlling the timer reservation heating mode for operating the combustion type heater at the time set by the timer when the engine is stopped, the electronic control unit sets the timer reservation heating mode to the blower. A combustion-type heating device for a vehicle, characterized in that the heating is performed while the vehicle is stopped.