KR100369168B1 - Method of stabilizing engine rpm for vehicles - Google Patents

Abstract

In the engine speed stabilization method of the vehicle of the present invention, when the air conditioner switch and the air conditioner relay are operated, the step of checking whether the flow rate of the dash port is trailed when the air conditioner switch is on and the air conditioner relay is on. Wow; In the step (iii), when the dashpot flow rate is trailing, when the air conditioner relay is turned on, completing the dashpot trailing by applying the flow rate of the dashpot when the air conditioner is turned on; In the step (iii), when the dashpot flow rate is trailing, when the air conditioner relay is turned off, reducing the flow rate by the flow rate reduction amount (b) when the air conditioner relay is turned off; In the step (iii), when the air conditioner switch is in the on state and the air conditioner relay is in the off state, the flow rate of the dashpot is trailed, and when the air conditioner relay is in the on state, the flow rate is increased by the amount of flow added when the air conditioner is turned on to complete the dash trailing (Iii) performing step; In the step (iii), when the air conditioner switch is in the off state, if the trailing flow is confirmed by trailing the flow rate of the dashpot, the step of applying the dashpot flow rate (d) when the air conditioner is turned off, and the dash is made. Prevents sudden fluctuations in engine speed when changing air conditioning loads during port trailing.

Description

How to stabilize engine speed in a car {METHOD OF STABILIZING ENGINE RPM FOR VEHICLES}

The present invention relates to a method for stabilizing engine speed of a vehicle, and more particularly, to a method for stabilizing engine speed of a vehicle to prevent the engine speed from being changed when an air conditioner relay is operated during a dashpot operation in a vehicle. It's about.

In general, a vehicle is provided with a dash port to prevent the throttle valve from closing rapidly and the engine output becomes unstable when the driver rapidly removes the force applied to the accelerator pedal. That is, the dash port reduces the speed at which the throttle valve closes when the accelerator pedal is released rapidly, thereby preventing a sudden change in the engine speed. The trailing port closes slowly to prevent sudden changes in engine speed, called trailing.

And the flow rate of the dashpot in a vehicle equipped with an air conditioner is controlled differently depending on whether the air conditioner is operating. Through the flow rate control of the dashpot can be controlled for the engine speed.

That is, as shown in FIG. 1, whether the air conditioner switch 11 is turned on or off and whether the air conditioner relay 13 is turned on or off is detected by the controller 15 to control the flow rate of the dashpot. At this time, whether the air conditioner relay 13 is on or off is determined according to the result of the automatic temperature control device 12 detecting the current temperature. Thus, when the current temperature is suitable to drive the air conditioner compressor 14, the automatic temperature control device 12 switches the air conditioner relay 13 to the on state to lower the temperature in the vehicle.

At this time, the controller 15 controls the idle speed switch 16 and the dash port 17 according to the switching state of the air conditioner switch 11 and the air conditioner relay 13 to adjust the engine speed according to the change of the air conditioner load.

The control method as shown in FIG. 2 is applied to the dashpot flow rate adjusting device when the air conditioner is on / off to stabilize the engine speed.

In FIG. 2, when the air conditioner switch is turned on, the current temperature is monitored. The current temperature monitored is a criterion for deciding whether to start the air conditioner compressor (ST11 to ST12).

The start of the air conditioner compressor is linked to on / off of the air conditioner relay, and it is determined whether the air conditioner relay is on or off according to the relationship between the constant temperature and the present temperature set in the automatic temperature controller (ST13).

When the air conditioner relay is turned on, the idle switch is turned off (ST14).

After the idling is switched off as described above, it is checked whether the flow rate of the dash port is trailing, and if the flow rate of the dash port is not trailing, the control operation is terminated (ST15).

Subsequently, after it is confirmed that the dashpot flow rate is trailing, the dashpot flow rate a at the time of turning on the air conditioner is applied regardless of whether the air conditioner relay is on or off (ST16 to ST17).

The trailing of the dashpot is performed according to the flow rate a and is completed (ST18).

On the other hand, in the ON state of the air conditioner switch, the current temperature may not satisfy the start condition of the air conditioner relay (ST13). In this case, turn off the idle switch and check whether the flow rate of the dash port is trailing (ST19 ~ ST20).

So, if it is confirmed that the flow rate of the dash port is trailed, check whether the air conditioner relay is switched to the on state (ST21).

In addition, when the air conditioner switch is turned off, the idle switch is turned off and the flow rate of the dash port is trailed. At this time, if it is confirmed that the flow rate of the dashpot is trailing, the flow rate (d) of the dashpot when the air conditioner is turned off is applied (ST22 to ST23).

When the air conditioner relay is turned on while the flow rate of the dash port is confirmed to be trailed, the flow rate d of the dash port is applied when the air conditioner is turned off (ST24).

However, in the related art described above, after the air conditioner relay is operated when the air conditioner switch is turned on and the air conditioner compressor is started, the air conditioner load is released if the air conditioner relay is turned off while the dash port is trailing. Since the port air flow rate is applied, there is a problem that an over shoot is caused due to the excessive air flow rate.

In addition, the air conditioner relay is operated according to the set temperature of the automatic temperature control device when the air conditioner switch is turned on, and the air conditioner compressor is started by the operation of the air conditioner relay. This is big.

Therefore, the prior art of controlling the dashpot operation at idle in accordance with the on / off operation of the air conditioner relay has a problem that can not supply the engine output enough to cover the air conditioner load in the excessive operating state.

That is, when the air conditioner is controlled by the automatic control method, there was no proper control function of the EMS (Electronic Management System) for turning on / off the air conditioner relay.

The present invention has been created to solve the above-mentioned conventional problems, an object of the present invention is to prevent the engine rotation of the engine when the air conditioning relay is operated during the dashpot (Dashpot) operation of the vehicle engine rotation of the vehicle To provide a stabilization method.

1 is a block diagram of a dashpot flow rate adjusting device when the air conditioner on / off of a typical vehicle.

Figure 2 is a flow chart of the engine speed stabilization method of the vehicle of the prior art.

Figure 3 is a flow chart of the engine speed stabilization method of the vehicle of the present invention.

Explanation of symbols on the main parts of the drawings

11: air conditioner switch 12: automatic temperature control device

13: air conditioner relay 14: compressor

15 control unit 16 idle switch

17: Dashport

In order to achieve the above object, the engine speed stabilization method of an automobile according to the present invention detects that an air conditioner switch and an air conditioner relay are operated by a user of the car, and the air conditioner switch is in an on state and the air conditioner relay is in an on state. (I) confirming whether or not the flow rate of the gas is trailing; In step (iii), when it is confirmed that the air conditioner relay is turned on in the state that the dash port flow rate is being trailed, the completion of dash trail trailing is applied by applying the flow rate (a) of the dash port when the air conditioner is turned on. (Ii) step; In the step (iii), when it is confirmed that the air conditioner relay is switched off while the dashed port flow rate is confirmed to be trailing, the flow rate is reduced by the amount of the flow reduction (b) when the air conditioner relay is turned off to complete the dash trail trailing. (Iii) performing step; In the step (iii), when the air conditioner switch is in the on state and the air conditioner relay is in the off state, when the flow rate of the dash port is trailed and the air conditioner relay is turned on, the flow rate is increased by the amount of the flow rate added when the air conditioner is turned on. (Iii) completing dash trailing; In the step (iii), if the air conditioner switch is in the off state, checking whether the dashpot flow rate is trailed and checking that the trailing flow rate (d) is applied when the air conditioner is turned off. .

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

The flow rate of the dashpot is generally adjusted to provide more flow rate from the air conditioner on state to the air conditioner off state to compensate for the air conditioner load. In this case, even when the same dash trailing is performed, the engine speed is largely changed when the air conditioner load is changed due to the on / off switching of the air conditioner relay.

Therefore, in order to prevent an engine speed change when the air conditioner load is changed, the air conditioner load change and the operation state of the dash port should be sensed, respectively.

Item Air conditioner relay Dashport Progress Air conditioner relay Engine speed behavior Resolution ON OFF ON OFF In case of [A] ON Yes OFF Overshoot occurrence Flow reduction For [B] ON Yes ON No problem For [C] OFF Yes ON Undershoot occurrence Increased flow For [D] OFF Yes OFF No problem

In the case of [A], in the case of [A], the air conditioner relay is turned on and off while the dash port is trailed, indicating that an overshoot occurs in the engine speed, and the overshoot appropriately adjusts the flow rate of the dash port. It can be solved by reducing it.

In the case of [B], it indicates that the air conditioner relay is kept in an on state, and indicates that the engine speed is maintained stably regardless of the progress of the dash port. Similarly, the case of [D] indicates that the engine speed is stable by keeping the air conditioner relay off.

On the other hand, in the case of [C], the air conditioner relay is turned off and on while the dash port is trailed, indicating that an under shoot occurs in the engine speed, and the undershoot corrects the flow rate of the dash port. It can be solved by increasing.

The control of the flow rate of the dashpot is performed according to the system as shown in the diagram, which will be described step by step.

As shown in FIG. 3, when the driver or the user of the vehicle turns on / off the air conditioner switch according to the will of use, the on / off switching state of the air conditioner switch is detected (ST31). At this time, the on / off of the air conditioner switch is performed by an operation of a panel switch.

Thus, when the air conditioner switch is turned on, the current temperature is detected by monitoring the indoor temperature of the vehicle (ST32). The current monitored temperature is compared to the reference temperature set in the automatic temperature control plant and becomes the basis for determining whether the air conditioner compressor is started.

If the current monitored temperature is suitable for starting the air conditioner compressor, the air conditioner relay is turned on to provide power for starting the air conditioner compressor. The air conditioner relay is turned off again when the air conditioner compressor is operated and the current temperature is appropriately lowered (ST33).

When the air conditioner relay is turned on, the idle switch is turned off (ST34). The reason why the operation of turning off the idle switch is performed is to increase the engine speed in order to supply sufficient power for driving the air conditioner compressor.

Then, it is checked whether the flow rate of the dash port is trailing (ST35).

In addition, when it is confirmed that the dash port flow is trailing, the on / off state of the air conditioner relay is determined to detect a change in the air conditioner load (ST36).

Thus, when it is confirmed that the air conditioner relay is in the on state, by controlling the dashpot trailing by applying the dashpot flow rate (a) when the air conditioner is on (ST37). The trailing of the dashpot is performed according to the flow rate a of the dashpot when the air conditioner is applied and is completed (ST38).

When it is confirmed in step ST36 that the air conditioner relay is turned off, the step of improving control of the air conditioner off is performed while the air conditioner is on and the dash port is in operation. That is, the flow rate of the dash pot is reduced by the flow rate reduction amount b when the air conditioner is turned off (ST39 to ST40). At this time, the flow rate reduction amount (b) when the air conditioner is off may be preset to an appropriate value.

When the step ST40 is performed, the flow rate of the dashpot is obtained by subtracting the flow rate reduction amount (b) when the air conditioner is off from the flow rate (a) of the dashpot when the air conditioner is on.

Dashport Flow = (a)-(b)

Same as

Thus, the flow rate of the dashpot reduced in accordance with step ST40 is applied to perform the trailing of the dashpot (ST38).

On the other hand, if it is determined that the condition is suitable to keep the air conditioner relay off in step ST33, and the air conditioner relay is turned off, the idle switch is turned off and it is checked whether the flow rate of the dash port is trailing (ST41 to ST42). .

At this time, if it is not trailing, an additional control operation is unnecessary, but if the air conditioner relay is turned on in the state that trailing is confirmed, the control operation must be continued (ST43).

That is, after increasing the flow rate of the dashpot by the flow rate addition amount (c) when turning on the air conditioner (ST44 to ST45), the trailing is completed according to the increased flow rate of the dashpot (ST38). At this time, the flow rate addition amount c at the time of turning on the air conditioner may be preset to an appropriate value.

When the step ST45 is performed, the flow rate of the dashpot is obtained by adding up the flow rate d of the dashpot when the air conditioner is turned off and the flow rate addition amount c when the air conditioner is turned on.

Dashport Flow = (c) + (d)

Same as

In addition, when it is confirmed in step ST31 that the switching state of the air conditioner switch is off, the idle switch is turned off and it is checked whether the dash port flow rate is trailing (ST46 to ST47).

Therefore, if it is confirmed that the flow rate of the dashpot is not trailing, no additional control action is performed, but if it is confirmed that the flow rate is trailing, the dashpot flow rate (d) is applied when the air conditioner is turned off, and the trailing of the dashpot is applied. This is done (ST48).

As described above, the present invention detects the switching state of the air conditioner switch switched on and off and the trailing state of the dash port according to the user's will, and adjusts the flow rate of the dash port appropriately according to each detected state, Even when the load changes due to the on / off, it is possible to maintain a stable number of revolutions of the engine idle.

In the engine speed stabilization method of the vehicle according to the present invention, the trailing is performed in a state in which the flow rate of the dash port is adjusted as the air conditioner load is changed, thereby changing the engine speed during idling even when the air conditioner load is changed. There is an effect that can be prevented.

In addition, when the dash port operates during the air conditioner load operation and the driving condition becomes excessive while the trailing is in progress, the engine idling stability is improved by preventing the sudden change of the engine speed due to the actual air conditioner relay operation.

Although the preferred embodiment of the present invention has been described above, the present invention may use various changes, modifications, and equivalents. It is clear that the present invention can be applied in the same manner by appropriately modifying the above embodiments. Therefore, the above description does not limit the scope of the following claims.

Claims (4)

(Iii) detecting that the air conditioner switch and the air conditioner relay are operated by the user of the vehicle, and checking whether the flow rate of the dash port is trailing if the air conditioner switch is in the on state and the air conditioner relay is in the on state; (Ii) if it is confirmed in step (iii) that the air conditioner relay is turned on in the state that the dash port flow rate is being trailed, the dash port trailing is applied by applying the flow rate (a) of the dash port when the air conditioner is on. Completing the step; (Iii) If it is confirmed in step (iii) that the air conditioner relay is switched off while the dashed port flow rate is confirmed to be trailing, the flow rate is reduced by the flow rate reduction amount (b) when the air conditioner relay is turned off. Completing the ring; (Iii) When the air conditioner switch is in the on state and the air conditioner relay is in the off state in step (iii), if the flow rate of the dash port is trailed and the air conditioner relay is on, Incrementing to complete the dash trail trailing; (Iii) if the air conditioner switch is turned off in the step (iii), checking whether the dashpot flow rate is trailing, and if it is confirmed that the air conditioning is trailing, applying the dashpot flow rate d when the air conditioner is turned off. The engine speed stabilization method of the vehicle, characterized in that. The method of claim 1, wherein step (iii) Checking whether the air conditioner switch is turned on; Detecting a current temperature by monitoring a current temperature of a vehicle interior when the air conditioner switch is turned on; Performing, by the automatic temperature control device, an on / off operation for an air conditioner relay by comparing the detected current temperature with a predetermined reference temperature; Increasing an engine output by turning off an idle switch after an on / off operation is performed on the air conditioner relay; And checking whether the flow rate of the dash port is trailing after the idle switch is turned off. According to claim 1, wherein in the step (iii) the flow rate of the dashpot, The engine speed stabilization method of the vehicle, characterized in that determined by subtracting the flow rate reduction amount (b) when the air conditioner is off from the dash port flow rate (a) when the air conditioner is on. The method of claim 1, wherein step (iii) comprises: Turning off an idle switch when the air conditioner relay is in an off state; Checking whether the flow rate of the dash port is trailed when the idle switch is turned off; Checking whether the air conditioner relay is turned on when it is confirmed that the flow rate of the dash port is trailing; Detecting the flow rate addition amount c when the air conditioner is turned on when the air conditioner relay is turned on; And calculating the flow rate of the dashpot by adding the detected airflow on-flow flow rate adding amount (c) to the air conditioner on-dash dash flow rate (d).