JP3491284B2 - Engine start control device for engine driven heat pump device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine start control system for an engine driven heat pump system including an engine for driving a compressor in a refrigerant circuit.

[0002]

2. Description of the Related Art An engine-driven heat pump device is provided with a compressor in a refrigerant circuit and an engine for driving the compressor, and a mixture of gas and air is used as fuel for the engine.

[0003]

This engine driven heat pump device is sometimes used as an air conditioner capable of performing cooling operation and heating operation, and the engine of such an air conditioner is operated by the user by operating a start switch. By doing so, it is required to be automatically started. By the way, the starting conditions of the engine change such that the gas composition of the gas as the fuel of the engine is different depending on the region where it is used, the air-fuel ratio is different depending on the use conditions, and the like. It is difficult for the user to adjust this each time, and the startability of the engine may deteriorate.

The present invention has been made in view of the above circumstances, and provides an engine start control device for an engine driven heat pump device which improves engine startability by automatically setting engine start conditions. Is intended.

[0005]

Means for Solving the Problems] to solve the above problems, and
In order to achieve the object, the present invention is configured as follows.
did. The invention according to claim 1 comprises a compressor in the refrigerant circuit, and an engine for driving the compressor ,
The air-fuel ratio of the mixture of fuel gas and air to the engine
In the engine driven heat pump apparatus that are controlled by the opening degree, the engine starting means for starting based on the preset start condition of the engine, and an engine start judging means for judging a starting state of the engine, when the engine start Engine starting condition storage means for storing the starting condition of
Possess a starting condition resetting means for setting a starting condition on the basis of the start determination of the engine again, the engine starting means
Is a setting stored in advance in the engine starting condition storage means.
After setting the valve opening to a constant opening, start the start try
And, the engine does not start at the engine start decision means
If it is determined that the cumulative number of start tries is on the lean side,
Until the number of tries is exceeded or the engine is started.
, Change the valve opening to the lean side, and restart the
B) repeatedly, and the number of starting tries is
After exceeding the number of times, wait until the engine starts
Repeat the starting try with the throttle opening changed to the rich side.
Performed back, and starting trial by the engine start judgment means
If it is determined that the engine has started,
The condition resetting means is described in the engine starting condition storing means.
Write the remembered set opening to the valve opening at engine start.
It is an engine start control device for an engine-driven heat pump device, which is changed and set again . According to a second aspect of the present invention, the number of start tries is
After the number of side trials has been exceeded, the cumulative number of start trials
Until the total number of tries is exceeded, or the engine
Until restarting, change the valve opening to the rich side
The engine does not start after repeated start tries.
The total number of starting tries exceeds the total number of tries.
If the error occurs, the start try is stopped and an error warning is displayed.
The engine-driven thermopon according to claim 1, characterized in that
Engine start control device

[0006]

In the invention according to claim 1, the valve opening degree is made lean.
Change to the side and repeat the start try again.
Or restart the valve by changing the valve opening to the rich side.
If the engine is started after repeating step b, the valve opening at the time of engine start is memorized and set again.
The engine is started based on the valve opening that has been set again . According to the second aspect of the invention, the cumulative number of start tries is
If the number of tar tries is exceeded, stop the starting tries,
Display an error warning .

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an engine start control device for an engine driven heat pump device of the present invention will be described below. FIG. 1 is a system block diagram of an engine-driven heat pump device of the present invention. In the figure, reference numeral 1 is an engine-driven heat pump device, and this engine-driven heat pump device 1 is provided with a compressor 2, and this compressor 2 is an engine 3
Driven by.

A mixture of air and gas is used as fuel for the engine 3, and an air supply pipe 4 connected to the engine 3 is provided with a throttle 5. A gas supply pipe 6 is connected to the throttle 5. At this throttle 5, air and gas are mixed. A main valve 7 is provided in the gas supply pipe 6, and the main valve 7 adjusts the gas supply amount. Further, a bypass air supply pipe 8 is connected to the gas supply pipe 6 on the downstream side of the main valve 7, and a sub valve 9 connected to the bypass air supply pipe 8 can finely adjust the air supply amount. Has become.

The main valve 7 and the sub valve 9 are
For example, a linear solenoid valve is used, and the main valve 7 and the sub valve 9 are controlled by the engine control unit 10. The engine control section 10 includes an engine starting means 11 for starting the engine based on preset starting conditions, and an engine start determining means 1 for determining the starting state of the engine.
2, engine starting condition storage means 13 for storing the starting condition at the time of starting the engine, and starting condition resetting means 14 for resetting the starting condition based on the engine start determination.
And have. Further, the engine control unit 10 includes
The engine speed is determined from the trigger pulse of the engine ignition system.

In the engine control unit 10, when the engine start switch is operated, the engine starting means 11 controls the main valve 7 and the sub valve 9 to start the engine based on the preset starting condition of the starting air-fuel ratio. . At this time, the engine start determination means 12 determines the start state of the engine. Then, the starting condition at the time of starting the engine is stored in the engine starting condition storing means 13, and the starting condition is reset by the starting condition resetting means 14 based on the engine starting judgment by the engine starting judging means 12, When the engine is started, the engine can be started based on the reset conditions set again.

The compressor 2 is connected to the output shaft 15 of the engine 3 via a clutch 16, and the clutch 16 is controlled by a system controller 17. The compressor 2 drives a heat pump unit 18 for compressing and circulating a refrigerant such as CFC.
Is controlled by the system control unit 17, the indoor heat is recovered from the indoor heat exchanger in the cooling operation state, the outdoor heat is recovered in the heating operation state by the outdoor heat exchanger, and the heat is supplied from the indoor heat exchanger to the room. Do.

Next, a specific example of starting the engine of the engine-driven heat pump device will be described in detail with reference to the flowchart for starting the engine shown in FIG. Step a
Then, an engine starting command is output based on the starting condition of the preset starting air-fuel ratio, and thereby the main valve 7 and the sub valve 9 are controlled to set the starting opening degree (step b). Next, the engine start count N is set to 1 (step c), and the engine is started (step d). An engine start determination is made based on the number of engine start tries (step e), and when the engine starts in one try, the starting opening is stored (step f) and the heat pump system is started (step g). ).

In step e, if the engine is not started in one try, the process proceeds to step h, the number of tries is compared, and if the number of tries is the lean side try number B1 or less, the engine start opening is set. It is reset to the lean side (step i), 1 is added to the engine start count N (step j), the process proceeds to step d, and the engine is restarted.

At step h, the number of engine tries is
The number of tries on the lean side or more, and the total number of tries B2 or more
In the case of lower, the process proceeds to step k, the engine start opening is reset to the rich side, and the engine start count N is set to 1
Add (step j), move to step d, and restart the engine. In step h, if the number of engine tries exceeds the total number of tries B2 , the process proceeds to step 1 to stop the engine start and display an error (step m).

Next, the start-up of the system of this engine-driven heat pump device will be described in detail with reference to the system start-up flowchart of FIG. In step A, the clutch meat rotation speed is set, and it is determined whether the rotation speed is equal to or higher than the set rotation speed (step B). If the rotation speed is not higher than the set rotation speed, the process proceeds to step C to determine whether or not the set time has elapsed. If the number of revolutions does not exceed the set number of revolutions even after the elapse of the set time, an abnormal display is made (step D). By setting this lapse of time, if the carbon bites into the intake valve in the engine and the rotation does not increase due to the valve stem stick, etc., no load operation is performed for a certain period of time, carbon is crashed, and the valve stem Apply familiar operation Perform familiar operation.

In step B, when the number of revolutions exceeds the set number of revolutions,
Clutch meet is performed (step E), and the system is set to the required speed (step F). Step G
Then, it is determined whether the engine speed is within the required engine speed range, and if it is within the required engine speed range, normal operation is performed (step H).

If it is determined in step G that the rotational speed is not equal to or higher than the required number of revolutions, the process proceeds to step I to determine whether to continue the operation. Even if the engine speed can be increased to the clutch engagement speed, this operation continuation judgment is performed if the engine stalls or the engine speed decreases when a load is applied while the clutch is engaged. The output is recovered by performing. If the output can be recovered by the operation continuation determination, the process proceeds to step H and the normal operation is performed. On the other hand, if the output cannot be recovered by this operation continuation determination, the clutch is disengaged (step J), the engine is stopped (step K), and an abnormality is displayed (step L).

[0018]

As described above, according to the first aspect of the invention, the valve opening degree is changed to the lean side and the engine is restarted.
Repeatedly try or set the valve opening to the rich side
Repeatedly repeat the start try after changing to
If the engine starts, remember the valve opening when the engine was started , set it again, and set it again for the next engine start.
The startability of the engine is improved by starting the engine based on the determined valve opening . In the invention according to claim 2, the starting torque
If the total number of lie exceeds the total number of tries,
Stop the start try, in a call to alert display an abnormal, you
The engine can be notified to the user.

[Brief description of drawings]

FIG. 1 is a system block diagram of an engine-driven heat pump device.

FIG. 2 will be described in detail based on a flowchart of engine start.

FIG. 3 will be described in detail based on a flowchart of system startup.

[Explanation of symbols]

2 compressor 3 engine 11 Engine starting means 12 Engine start determination means 13 engine starting condition storage means 14 Starting condition resetting means

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) F02D 19/00 F02D 41/00-45/00 F02D 29/00

Claims (2)

(57) [Claims] 1. A fuel for an engine, comprising a compressor in a refrigerant circuit and an engine for driving the compressor.
The air-fuel ratio of the mixture of gas and air is controlled by the valve opening.
In engine-driven heat pump unit that will be your an engine starting means for starting based on the preset start condition of the engine, and an engine start judging means for judging a starting state of the engine, the start condition at the time of engine start and engine starting condition storage means for storing, possess a starting condition resetting means for setting a starting condition on the basis of the start determination of the engine again, the engine starting means, the engine start condition storing hand
The valve opening is set to the preset opening stored in the stage.
After that, a start trial is started, and the engine start determination means determines that the engine will not start.
If it is set, the cumulative number of start tries is
B Until the number of times is exceeded or the engine is started,
Repeat the start try after changing the valve opening to the lean side.
Repeatedly , after the number of starting tries exceeds the number of tries on the lean side
Keeps the valve opening to the rich side until the engine starts.
The start trial is repeatedly performed after changing it , and the engine is judged during the start trial by the engine start judging means.
If it is determined that the engine has started, the above-mentioned starting condition reset procedure
The stage is a setting stored in the engine starting condition storage means.
Rewrite the opening to the valve opening when the engine was started and try again.
An engine start control device for an engine-driven heat pump device characterized by being set . 2. The number of starting tries is lean side try times.
After the number is exceeded, the total number of starting tries is
Until the number of times exceeds or the engine starts.
, Change the valve opening to the rich side, and restart
B) repeatedly, and the cumulative number of start trials is
-Stop the start try when the number of total tries is exceeded.
However, a warning is displayed to indicate an abnormality.
Engine start control device for the engine driven heat pump device
Place