KR20180034877A - Apparatus for controlling auto-stop of construction machinary using emergency stop switch - Google Patents

Abstract

The present invention relates to an apparatus for controlling auto-stop of construction machinery, which can prevent unnecessary fuel consumption with an emergency stop switch to automatically stop an engine in case of emergency, and further, automatically stop the engine when work is not performed regardless of emergency. The apparatus comprises: an emergency stop switch; an engine control unit (ECU) controlling operation of an engine; and an auto idle control unit connected between an output end of the emergency stop switch and the ECU with an electric or circuit means to transmit an applied emergency stop signal to the ECU when the emergency stop signal is applied by operation of the emergency stop switch, and generating an engine stop signal corresponding to detection of an idle state of the engine in a state in which there is no operation of the emergency stop switch to be transmitted to the ECU.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an automatic stop control device for an automatic stop control device,

The present invention relates to an apparatus for implementing or controlling an auto-stop function by utilizing an emergency stop switch of a construction machine.

Generally, in construction machines including excavators and loaders, fuel efficiency reduction is classified as the most important improvement factor, and logic for the auto idle function is added as one of research and development for this.

The auto idle function is used when the construction machine is started and the engine is operated in a certain range of engine speed (RPM). If the engine is idle due to the operation being stopped or not being operated for a long time, (Hereinafter referred to as an idle low RPM).

However, even in such an auto idle state, since the engine continues to be driven, fuel consumption and carbon dioxide are generated.

In order to improve this point, in the prior art document 10-2013-0127467 (entitled " engine idle control device and method of excavator ") disclosed in 2013, an engine is automatically Stopping or driving the same.

However, the conventional prior art document only describes that the engine is stopped and driven according to the ON / OFF state of the safety device, so that the safety device is kept in an ON state (operation is possible) There is a problem that unnecessary fuel is consumed.

Likewise, the existing construction machine is provided with an emergency stop switch which can stop the engine only by the operation of the switch in case of an emergency, and the construction machine utilizing the emergency stop switch can control the engine according to the on / off state of the emergency stop switch regardless of the idle control of the engine There is a problem that only the function of stopping the operation is stopped.

1, when the emergency stop switch 10 of the existing construction machine is connected to the construction machine ECU 20 and the operation of the emergency stop switch 10 is inputted from the operator, the construction machine ECU 20 controls the engine (30) is stopped. That is, even when the engine 30 is not in the idle state, the existing construction machine stops the engine when the emergency stop switch 10 is operated, or the emergency stop switch 10 is turned on even when the engine 30 is in the idle state. The engine 30 did not stop. Therefore, in addition to the emergency stop switch 10, an additional means for stopping the engine is required depending on the idle state of the engine. As a result, the structure of the construction machine becomes complicated and the efficiency of maintenance becomes poor.

Therefore, there is a need for a technology capable of implementing an auto idle stop function by utilizing an emergency stop switch already provided in a construction machine.

The present invention relates to an automatic stop control system for a construction machine capable of automatically stopping an engine in an emergency by using an emergency stop switch and preventing an unnecessary fuel consumption by automatically stopping the engine in the event of an idle state, Device.

It is a further object of the present invention to provide an automatic stop function that can be easily applied to an existing construction machine without an auto idle function by mounting the auto stop logic in a simple wiring connection at the output terminal of the emergency stop switch, To be able to.

According to another aspect of the present invention, there is provided an automatic stop control apparatus for a construction machine, which uses an emergency stop switch, including an emergency stop switch for stopping the engine when an emergency occurs; An engine control unit (ECU) for controlling the operation of the engine; And an emergency stop switch connected between the output terminal of the emergency stop switch and the ECU, wherein the emergency stop signal is transmitted to the ECU when an emergency stop signal is applied by operation of the emergency stop switch, And generates an engine stop signal corresponding to the idle state of the engine and transmits the generated engine stop signal to the ECU.

Wherein the auto idle control unit outputs an auto stop signal for automatically stopping the engine when at least one of the emergency stop signal and the engine stop signal is applied or both the emergency stop signal and the engine stop signal are applied, And the ECU transmits a control signal for stopping the engine to the engine based on an auto-stop signal output from the auto-idle control unit.

The automatic idle control unit may include a digital logic determination unit for determining whether an auto stop signal is output for automatically stopping the engine according to whether the emergency stop signal and the engine stop signal are applied.

At this time, if the digital logic determination unit receives two signals, that is, a signal output from the emergency stop switch and an output signal depending on whether the engine is in an idle state, and if any one of the input signals is a signal for stopping the engine And outputs a normal state signal for normal engine driving if the input two signals are not signals for stopping the engine.

The digital logic determination unit may include an OR gate.

The automatic idle control unit may include at least one of a hydraulic actuator, an exhaust gas aftertreatment device (DPF), a safety lever, an operation lever for operating an operation of a working machine including a boom, an arm and a bucket of a construction machine, And an auto stop state detecting unit connected to the idle state detecting unit of the at least one idle state detecting unit and detecting an auto stop state according to the operation of the at least one idle state detecting unit.

Wherein the automatic stop state detection unit detects the presence or absence of a work based on a signal detected from the at least one idle state detection unit and detects an unprocessed state from the at least one idle state detection unit or detects the at least one idle state detection And outputs an engine stop signal when all the means are in the unactuated state.

According to the present invention, when the operation of the emergency stop switch at the time of emergency is inputted, the engine is automatically stopped, and when the operation is not performed even when the emergency is not performed, the engine is determined as the idle state and the engine is automatically stopped to prevent unnecessary fuel consumption There is an effect that can be.

Further, the present invention has an effect that the emergency stop function can be used simultaneously by interlocking the auto stop logic with the emergency stop switch without interlocking with the main ECU of the construction machine.

In addition, since the present invention can implement the auto stop function by simple wiring connection to the output terminal of the emergency stop switch, if the logic for the auto stop function is provided as a separate independent component, it is easy for the existing construction machine There is an effect that can be applied. As a result, it is possible to maximize the after-market of construction machinery.

1 is a block diagram showing an engine stop control apparatus of a general construction machine.
2 is a block diagram of an automatic stop control apparatus of a construction machine utilizing an emergency stop switch according to an embodiment of the present invention.
3 is a detailed block diagram of the auto-idle control unit of FIG.
4 is a logic diagram showing the logical relationship in which the digital logic determination circuit of FIG. 3 operates.
5 is a flowchart illustrating a process of operating an automatic stop control apparatus of a construction machine according to an embodiment of the present invention.

It is noted that the technical terms used herein are used only to describe specific embodiments and are not intended to limit the invention. Also, the technical terms used herein should be interpreted in a sense that is generally understood by those skilled in the art to which the present invention belongs, unless otherwise defined in this specification, and it should be understood that an overly comprehensive It should not be construed as a meaning or an overly reduced meaning.

Also, the singular forms "as used herein include plural referents unless the context clearly dictates otherwise. In the present application, the term "comprising" or "comprising" or the like should not be construed as necessarily including the various elements or steps described in the specification, Or may be further comprised of additional components or steps.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

Although the embodiment of the present invention is described by way of example as a structure applied to a construction machine, the present invention is not limited thereto, and may be variously applied to a vehicle, a heavy equipment, an agricultural machinery, etc. mounted with an engine.

2 is a block diagram of an automatic stop control apparatus of a construction machine utilizing an emergency stop switch according to an embodiment of the present invention.

In the case of an excavator, the construction machine includes a lower traveling body having a traveling device driven by a traveling hydraulic motor, a swinging device driven by the swinging hydraulic motor, and an upper swinging body And a working machine mounted at a front central position of the upper revolving structure, wherein a cab is provided in the upper revolving structure. The working machine is a hydraulic cylinder for operating the boom cylinder, the arm cylinder, and the bucket, including a boom movably connected vertically to the upper revolving body, an arm rotatably connected to the boom, and a bucket rotatably connected to the arm, And a cylinder.

A driver's seat is provided in the cab, and a traveling lever, a traveling pedal, and an attachment pedal are mounted in front of the driver's seat to control the lower traveling body. An operation lever for operating the operation of the boom, the arm and the bucket is provided on both sides of the driver's seat. An emergency stop switch, a safety lever, a console, and a display are provided on one side of the operation lever.

2, an automatic stop control apparatus for a construction machine according to an embodiment of the present invention includes an emergency stop switch 100, an ECU 200, an engine 300, A control unit 400, and an idle state sensing unit 500. [ Here, the auto idle control unit 400 may also be referred to as an ISS module (Idle Stop and Start Module).

The automatic stop control device according to the embodiment of the present invention is configured to electrically or circuitly connect the automatic idle control unit 400 between the output terminal of the emergency stop switch 100 connected to the ECU 200 and the ECU 200, The auto idle stop function can be implemented at the same time while using the function of the stop switch 100 as it is.

The emergency stop switch 100 is a stop button for forcibly stopping the engine 300 of the construction machine in the event of an emergency, and the emergency stop switch 100 may be configured to stop the construction machine instantaneously due to unexpected factors such as an operator erroneously operating the construction machine When operating.

The emergency stop switch 100 is implemented as a switching circuit to selectively apply an emergency stop signal according to an operation of an operator, and may be mechanically provided with a toggle button or a push button.

An engine control unit (ECU) 200 controls the operation of the engine 300 to perform the traveling and the operation of the construction machine. That is, the operation of the engine is started or terminated by ON or OFF, and the engine speed (RPM) required for traveling and operation of the construction machine is controlled.

The auto idle control unit 400 is electrically or circuitly connected between the output terminal of the emergency stop switch 100 connected to the ECU 200 and the ECU 200 to provide an auto stop function.

Basically, when the emergency stop signal is applied by the manual operation of the emergency stop switch 100, the auto idle control unit 400 delivers the received emergency stop signal to the ECU 200 and controls the operation of the emergency stop switch 100 When the idle state of the engine is detected, the engine stop signal corresponding to the idle state of the engine can be generated and transmitted to the ECU 200.

At this time, when at least one of the emergency stop signal or the engine stop signal is applied, or both the emergency stop signal and the engine stop signal are applied, the auto idle control unit 400 outputs the auto stop signal to the ECU 200.

Then, the ECU 200 transmits a control signal for forcibly stopping the engine 300 to the engine 300 based on the auto-stop signal output from the auto-idle control unit 400. [

Here, the idle state of the engine can be determined as idle state when the running or operation of the construction machine is not performed, but the running is on for a predetermined time and there is no operation.

In this embodiment, if the idle state is determined, the engine may enter the auto stop mode. Alternatively, if the idle state is determined, the engine may be set to the low RPM, and if it is determined that no operation is performed thereafter, the engine may enter the auto stop mode.

As such, the auto-stop mode is determined on the basis of the traveling or working state of the construction machine. To this end, the auto idle control unit 400 controls the idle state detection means 500 to detect the traveling or working state of the construction machine, You can check.

The idle state detecting means 500 detects at least one of an engine speed sensor, a hydraulic actuator, an exhaust gas after-treatment device, a safety lever, an operation lever, and a boarding sensor for detecting a no- can do.

The engine speed sensor is a sensor for detecting the no-load state of the engine by checking the RPM of the engine 300, for example, an encoder may be used. However, if the auto idle control unit 400 is configured to directly acquire the engine speed information via the CAN communication with the ECU 200, the engine idling state can be checked without the engine speed sensor.

The hydraulic actuator is a hydraulic cylinder that controls the operation of the machine including the boom, arm, and bucket of the construction machine.

The exhaust gas post-treatment device is a device for suppressing harmful exhaust gas generated during operation of a construction machine. Typically, a diesel particulate filter (DPF) is a particulate filter (PM) When it accumulates more than a certain amount, it is a device which burns and removes by high temperature of 550 degrees or more. Since the DPF operates only when a certain amount of particulate matter (PM) accumulates, the DPF consumes a lot of energy when the DPF is operated. If the engine is stopped, the DPF may be damaged. It is better to stop.

The safety lever is operated by a worker for safe operation of the construction machine. The safety lever is provided at one side of the driver's seat and is operated when the operator leaves the driver's seat or boarded. For example, the safety lever can set the lock state of the lock or unlock according to the up and down rotation. When the safety lever is set to lock, the hydraulic pressure is cut off so that the fluid of the hydraulic devices does not move.

The operation lever manipulates the operation of the machine including the boom, arm and bucket of the construction machine. For example, it is possible to manipulate the up and down movement of the boom, the rotation of the arm and bucket, and the turning of the upper revolving body.

The boarding detection sensor is a sensor for detecting whether a worker is aboard the driver's seat, and may be a pressure sensor, a contact sensor, or an optical sensor installed in the driver's seat. The boarding detection sensor may be installed in the seat portion or the backrest portion of the driver's seat and may be provided in plural for more accurate sensing. For example, a plurality of boarding sensors may be provided in an area of the operator's buttocks in order to accurately sense that an operator has boarded. In addition, it is preferable that the sensing value of the boarding sensor is output only when the boarding is maintained for a certain period of time from the time when the boarding of the operator starts to be sensed. In this way, only when the occupant's boarding state lasts for a certain period of time, it is determined that the worker is aboard, so that the auto idle control unit can more accurately control the worker's work intention and control the rotation state of the engine.

In this way, the auto-idle control unit 400 basically checks the RPM of the engine through the idle state sensing unit 500 to determine whether the engine is in a no-load state, and outputs an idle signal for entering the auto-idle mode .

In addition, the auto idle control unit 400 checks whether the hydraulic actuator is operating and whether the exhaust gas post-treatment apparatus is operating through the idle state sensing unit 500, and if both the hydraulic actuator and the exhaust gas post- When it is in the operating state, it judges that there is no work and outputs an auto stop signal for entering the auto stop mode. The auto stop mode means a mode for automatically stopping the engine as described above.

In addition, the auto idle control unit 400 checks the lock state of the safety lever through the idle state detecting means 500, determines that the worker has no work if the safety lever is locked, And outputs a stop signal.

At this time, the auto idle control unit 400 can output the auto stop signal immediately after confirming the locked state of the safety lever. Alternatively, the auto-stop signal may be output after a predetermined period of time has elapsed since the confirmation. For example, it is determined whether the first elapsed time has been exceeded from the time when the safety lever is locked, or whether the second elapsed time is exceeded when the safety lever is unlocked. The first elapsed time or the second elapsed time It is possible to control to output the auto stop signal. The first elapsed time may be set to a time shorter than the second elapsed time so that the engine is forcibly stopped within the shortest time period when the safety lever is locked.

In addition, the auto idle control unit 400 confirms whether or not the operation lever is operated and whether or not the operator is boarded through the idle state sensing unit 500, and enters the auto stop mode when it is determined by the operator that there is no operation And outputs an auto-stop signal for performing the auto-stop operation.

As described above, the auto idle control unit 400 recognizes various conditions through the idle state detecting unit 500, and when at least one unexecuted state is detected or all of the unexecuted states are detected and satisfied simultaneously, A signal can be output. For example, if the safety lever is unlocked and both the hydraulic actuator and the exhaust after-treatment apparatus are malfunctioning, an auto stop signal for automatically stopping the engine can be output.

The detailed configuration of the auto idle control unit 400 is as follows.

FIG. 3 is a detailed configuration diagram of the auto-idle control unit of FIG. 2, and FIG. 4 is a logical table illustrating a logical relationship in which the digital logic determination circuit of FIG. 3 operates.

Referring to FIG. 3, the auto-idle control unit 400 may include a digital logic determination unit 410 and an auto-stop state sensing unit 420.

The digital logic determination unit 410 determines whether or not the engine 300 is automatically stopped according to whether the emergency stop signal applied from the emergency stop switch 100 and the engine stop signal applied from the idle state sensing unit 420 are applied, It is a logic element for judging the presence or absence of the output of the signal.

More specifically, the digital logic determination unit 410 receives the two signals A, B, which are the signal A output from the emergency stop switch 100 in FIG. 2 and the signal B output from the auto stop state detection unit 420, B) and receives a signal (for example, an emergency stop signal or an engine stop signal) for stopping the engine 300 even if one of the input signals A and B is inputted, the auto stop signal C is outputted And transmits it to the ECU 200.

If the input signals A and B are neither the emergency stop signal nor the engine stop signal, that is, the signal is not a signal for stopping the engine, the digital logic determination unit 410 outputs the general state signal C ). And transmits the output general state signal to the ECU 200.

For example, an OR gate device may be used as the digital logic determination unit 410. The OR gate element outputs 0 if only one of the two inputs is 1, and only if both inputs are 0.

If the automatic idle control unit 400 is connected between the output terminal of the emergency stop switch 100 connected to the ECU 200 and the ECU 200 without the digital logic determination unit 410 such as an OR gate, A short may occur. However, when the digital logic determination unit 410 such as an OR gate is connected between the output terminal of the emergency stop switch 100 and the ECU 200, signal processing can be performed while preventing a short circuit.

Utilizing the logical relationship of these OR gate elements, the inputs and outputs of the digital logic determination unit 410 are arranged as shown in the logic table of FIG.

4, the signal A output from the emergency stop switch 100 is assumed to be 1 when the emergency stop switch 100 is in operation and 0 when the emergency stop switch 100 is inoperative. That is, the case where the emergency stop switch 100 is operated and the emergency stop signal is outputted is regarded as 1.

The signal B output to the auto-stop state sensing unit 420 is assumed to be 1 in the auto-stop state and 0 in the normal state. In the case of the auto stop state, the case where the engine stop signal is outputted is regarded as 1.

The output C of the digital logic determination unit 410 is assumed to be 1 for an auto-stop signal and 0 for a normal state signal for normal engine operation.

For example, when the emergency stop switch 100 is not operated (0) and the signal B output to the auto-stop state sensing unit 420 is in the normal state (0), the digital logic determination unit 410 outputs the signal B 200 becomes a general state signal (0).

As another example, when the emergency stop switch 100 is operated (1) and the state sensed by the auto stop state sensing unit 420 is in a normal state (0), the digital logic determination unit 410 The output signal becomes the auto-stop signal (1).

On the other hand, when the emergency stop switch 100 is not operated (0) and the state sensed by the auto stop state sensing unit 420 is the auto stop state (1), the digital logic determination unit 410 determines that the ECU 200 Is an auto-stop signal (1).

If the emergency stop switch 100 is operated and the electronic stop state sensing unit 420 senses the auto stop state at the same time, the digital logic determination unit 410 determines that the ECU 200 is in the auto- The auto-stop signal 1 becomes the auto-stop signal.

Referring again to FIG. 3, the auto-stop state sensing unit 420 is connected to the idle state sensing means (500 of FIG. 2) to determine whether the idle state of the engine or the operation Check the status. If the engine is in a no-load state (idle state) or the engine is in a no-load state and there is no operation (idle stop state) as a result of checking, the auto stop state detection unit 420 detects an engine stop And transmits the signal to the digital logic determination unit 410.

Here, the 'no-operation state' refers to a state in which a signal sensed by at least one of the hydraulic actuator, the exhaust gas after-treatment device (DPF), the safety lever, the operation lever and the boarding sensor of the idle state sensing means It is possible to check the presence or absence of the operation of each sensing means.

The auto-stop state detection unit 420 detects various state conditions through the idle state detection means 500 (FIG. 2), detects at least one unprocessed state, or detects all of the unprocessed states and simultaneously satisfies the conditions The engine stop signal can be output.

For example, if it is checked through the idle state detecting means 500 that the safety lever is not locked and both the hydraulic actuator and the exhaust gas after-treatment apparatus are not working, an engine stop signal for automatically stopping the engine is output.

According to this configuration, the auto idle control unit 400 can perform signal processing to apply both the function of the emergency stop switch 100 and the auto stop function through the digital logic determination unit 410. [

5 is a flowchart illustrating a process of operating an automatic stop control apparatus of a construction machine according to an embodiment of the present invention.

5, the emergency stop control process S100 using the emergency stop switch 100 and the engine stop control process S200 according to the auto stop state are performed. The control processes S100 and S200 are performed independently. The digital logic determination unit 410 of the auto-idle control unit 400 receives the two signals and determines whether to set the auto-stop mode.

That is, the automatic stop control device of the construction machine of the present invention checks whether the emergency stop switch 100 is manually operated by the operator as in step S110.

If there is manual operation of the emergency stop switch 100, the emergency stop switch 100 outputs an emergency stop signal to the auto idle control unit 400 in step S120.

If there is no manual operation of the emergency stop switch 100, the emergency stop switch 100 outputs a general status signal.

The automatic stop control device of the construction machine of the present invention may control the auto idle state, the auto stop state, and the auto stop state based on signals detected by the idle state sensing means 500 in the auto idle control unit 400, And outputs a signal corresponding to the state.

For example, in step S210, when the engine is in a no-load state, the auto-idle control unit 400 enters the auto-idle mode and controls the engine 300 with low RPM.

In a next step 220, the auto idle control unit 400 senses a work state based on a signal sensed by the idle state sensing means 500. The signal detected through the idle state detecting means 500 may be at least one or more, and in a case of two or more, a variety of conditions may be determined in a complex manner, and the operation state may be checked according to the presence or absence of a work.

If it is determined in step S230 that the detection result of the idle state detection unit 500 is in the non-operation state, an engine stop signal is output as in step S240.

Thereafter, in step S300, the auto idle control unit 400 receives a signal output from the emergency stop switch 100 and a signal output according to whether or not the automatic stop state is established, and determines whether or not an engine stop is required through the digital logic determination unit 410 do.

If a signal for stopping the engine 300 is input to the auto idle control unit 400 from either of the signal output from the emergency stop switch 100 and the signal output in response to the auto stop state, (410) outputs the auto-stop signal (C) to the ECU (200).

Alternatively, when the signal output from the emergency stop switch 100 and the signal output according to the auto stop state are not general signals for stopping the engine 300, the auto idle control unit 400 may control the digital logic And outputs a general status signal for normal engine operation to the ECU 200 through the ECU 410. [

As described above, the auto stop control apparatus according to the present invention can easily implement the idle auto stop function by utilizing the emergency stop switch already provided in the construction machine.

Also, by using the digital logic determination unit, that is, the OR gate, provided in the auto idle control unit, the auto stop function can be realized while maintaining the function of the existing emergency stop switch.

The foregoing description is merely illustrative of the present invention, and various modifications may be made by those skilled in the art without departing from the spirit of the present invention. Accordingly, the embodiments disclosed in the specification of the present invention are not intended to limit the present invention. The scope of the present invention should be construed according to the following claims, and all the techniques within the scope of equivalents should be construed as being included in the scope of the present invention.

100: Emergency stop switch 200: ECU
300: engine 400: auto-idle control unit
500: Idle state detection means 410: Digital logic judgment unit
420: auto stop state detection unit

Claims (7)

An emergency stop switch for stopping the engine in an emergency;
An engine control unit (ECU) for controlling the operation of the engine; And
The emergency stop switch is electrically or circuitly connected between the output terminal of the emergency stop switch and the ECU so that the emergency stop signal is transmitted to the ECU when an emergency stop signal is applied by the operation of the emergency stop switch, An auto idle control unit for generating an engine stop signal corresponding to an idle state of the engine and transmitting the engine stop signal to the ECU;
The automatic stop control device of the construction machine utilizing the emergency stop switch including the emergency stop switch.
The method according to claim 1,
The auto-
Stop signal to stop the engine when at least one of the emergency stop signal or the engine stop signal is applied or both the emergency stop signal and the engine stop signal are applied,
The ECU includes:
Wherein the automatic stop control unit transmits a control signal for stopping the engine to the engine based on an auto stop signal output from the auto idle control unit.
3. The method according to claim 1 or 2,
The auto-
A digital logic determination unit for determining whether an auto stop signal is output to stop the engine according to whether the emergency stop signal and the engine stop signal are applied;
And an automatic stop control device for a construction machine utilizing the emergency stop switch.
The method of claim 3,
Wherein the digital logic determination unit comprises:
Stop signal and an output signal depending on whether the engine is in an idle state or not, and outputs an auto stop signal if it is a signal for stopping any one of the input signals, And outputs a normal state signal for normal engine operation if the input signals are not signals for stopping the engine.
5. The method of claim 4,
Wherein the digital logic determination unit includes an OR gate.
The method of claim 3,
The auto-
And at least one idle state sensing means including a hydraulic actuator, an exhaust gas aftertreatment device (DPF), a safety lever, an operating lever for operating the operation of the working machine including boom, arm and bucket of the construction machine, An auto-stop state sensing unit for sensing an auto-stop state according to the presence or absence of operation of the at least one idle state sensing unit;
And an automatic stop control device for a construction machine utilizing the emergency stop switch.
The method according to claim 6,
The auto-stop state sensing unit may include:
Determining whether or not an operation is performed based on a signal sensed by the at least one idle state sensing means and determining whether an operation state is detected from the at least one idle state sensing means or whether all of the at least one idle state sensing means An engine stop signal is outputted when the engine is stopped.

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