Self-adaptive automatic idle speed control method

Abstract

The invention discloses a self-adaptive automatic idle speed control method which comprises the following steps: firstly, judging whether a complete machine does not work or not, and if the complete machine works, directly ending and not entering an idle speed working condition of an engine; if the whole engine does not work, whether the engine is in an automatic regeneration state or not is judged, if the engine is in the automatic regeneration state, the engine is directly ended, and the engine does not enter the idling working condition, and if the engine is not in the automatic regeneration state, the engine enters the idling working condition; when the engine rotates at the idle speed, self-adaptive idle speed adjustment is achieved, oil consumption is saved, and meanwhile the situation that the heat dissipation performance is reduced, the cooling effect of the air conditioner is affected, or regeneration is affected during automatic regeneration can be prevented.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, and in particular to an adaptive automatic idle speed control method. Background Art

[0002] In order to save fuel consumption, current excavators generally have an automatic idle function. When it is detected that the excavator is not moving, the speed is reduced and the engine enters the idle speed to save fuel consumption. However, the reduction in speed will affect the heat dissipation of the engine, causing the engine to have a high temperature and affect the engine life. If the engine is in the process of automatic regeneration, reducing the speed is not conducive to regeneration. Moreover, when using air conditioning, the idle speed is reduced, which will also cause the air conditioning to stop, resulting in poor cooling effect. Summary of the invention

[0003] The present invention provides an adaptive automatic idle speed control method to solve the above problems, which include engine high temperature caused by too low engine idle speed, poor air conditioning cooling effect caused by too low engine idle speed, and engine speed reduction during automatic regeneration, which is not conducive to regeneration.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: an adaptive automatic idle control method, firstly judging whether the whole machine is not working, if the whole machine is working, directly terminating, and the engine does not enter the idle condition; if the whole machine is not working, then judging whether the engine is in the automatic regeneration state, if the engine is in the automatic regeneration state, directly terminating, and the engine does not enter the idle condition; if the engine is not in the automatic regeneration state, the engine enters the idle condition.

[0005] Furthermore, when the engine enters the idle condition, the idle speed needs to be adjusted according to the engine cooling requirements and the use of air conditioning.

[0006] Furthermore, the engine heat dissipation adjusts the idle speed: if the actual engine water temperature is greater than the engine limit water temperature or the actual hydraulic oil temperature is greater than the hydraulic limit oil temperature, the idle speed is increased so that after the engine idle speed is increased, the actual water temperature is less than the engine limit water temperature and the actual hydraulic oil temperature is less than the hydraulic limit oil temperature.

[0007] Furthermore, the ambient temperature is assumed to be T, the engine operating speed is N, the actual engine water temperature is Twater, and the actual hydraulic oil temperature is Toil; the engine limit water temperature is Twaterlimit, and the hydraulic limit oil temperature is Toillimit. When the engine enters the idle condition, the engine speed is reduced by Δn, and the idle speed Nidile is set. It is predicted that under the ambient temperature T, the actual engine water temperature after the speed is reduced by Δn is Twater and the actual hydraulic oil temperature is Toil. If Twater>Twaterlimit or Toil>Toillimit, the idle speed Nidile is increased so that after the engine idle speed, the actual engine water temperature Twater is greater than the engine limit water temperature Twaterlimit, and the actual hydraulic oil temperature Toil is greater than the hydraulic limit oil temperature Toillimit.

[0008] Furthermore, the use of the air conditioner adjusts the idle speed: when the air conditioner is turned on, if the fan speed is less than the speed currently required by the air conditioner, the idle speed is increased so that the increase in the engine idle speed does not affect the operation of the air conditioner.

[0009] Furthermore, the engine operating speed is N, the fan speed is Nf, the ambient temperature is T, and the air conditioning set temperature is Tk. When the engine enters the idle condition, the engine speed is reduced by Δn, and the idle speed Nd is set. It is predicted that under the ambient temperature T, the fan speed will be Nf after the speed is reduced by Δn. If the fan speed is lower than the minimum speed required by the current air conditioning, the idle speed N is increased so that the air conditioning operation is not affected after the engine idle speed.

[0010] The beneficial effect of the present invention is that when the engine enters the idle speed, adaptive idle speed regulation is realized, which can save fuel consumption and prevent the heat dissipation performance from decreasing, affecting the cooling effect of the air conditioner, or affecting the regeneration during automatic regeneration. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the process of the present invention. DETAILED DESCRIPTION

[0012] In order to make the purpose, technical solution and advantages of the present invention more clear, the present invention is further described in detail below through the accompanying drawings and embodiments. However, it should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the scope of the present invention.

[0013] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which the present invention belongs. The terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0014] like Figure 1 As shown, an adaptive automatic idle control method first determines whether the whole machine is not working. If the whole machine is working, it ends directly and the engine does not enter the idle condition; if the whole machine is not working, it is then determined whether the engine is in an automatic regeneration state. If the engine is in an automatic regeneration state, it ends directly and the engine does not enter the idle condition. If the engine is not in an automatic regeneration state, the engine enters the idle condition.

[0015] When the environment is high, in order to prevent the engine idle speed from being too low and causing high engine temperature, the idle speed is adjusted adaptively. The technical solution is: set the ambient temperature to T, the engine operating speed to N, and the water temperature to T 水 , hydraulic oil temperature is T 油 ;The engine water temperature limit is T水限 , the hydraulic oil temperature limit is T 油限 When no action signal is detected, the engine enters the idle state, the engine speed decreases by Δn, and the idle speed is set to N 怠 , predict the water temperature T after the speed decreases by Δn under the ambient temperature T 水 and oil temperature T 油 , if T 水 >T 水限 or T 油 >T 油限 , then increase the idle speed N 怠 , so that after the engine idle speed, the water temperature and hydraulic oil temperature are lower than the limit.

[0016] When the air conditioner is turned on, in order to prevent the engine idle speed from being too low, resulting in poor air conditioning cooling effect, the engine idle speed is adaptively adjusted. The specific solution is: the engine operating speed is N, the fan speed is N f , the ambient temperature is T, the air conditioner setting temperature is T k When no action signal is detected, the engine enters the idle state, the engine speed decreases by Δn, and the idle speed is set to N d , predict the fan speed N after the speed decreases by Δn at ambient temperature T f If the fan speed is lower than the minimum speed required by the current air conditioner, increase the idle speed N 怠 , so that the air conditioner will not be affected after the engine idles.

[0017] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modification, equivalent substitution or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An adaptive automatic idle speed control method, characterized in that: First determine whether the whole machine is not working. If the whole machine is working, end it directly and the engine does not enter the idle condition. If the whole machine is not working, then determine whether the engine is in the automatic regeneration state. If the engine is in the automatic regeneration state, end it directly and the engine does not enter the idle condition. If the engine is not in the automatic regeneration state, the engine enters the idle condition.

2. The adaptive automatic idle speed control method according to claim 1, characterized in that: When the engine enters the idle condition, the idle speed also needs to be adjusted according to the engine cooling requirements and the use of air conditioning.

3. The adaptive automatic idle speed control method according to claim 2, characterized in that: The engine heat dissipation adjusts the idle speed: if the actual engine water temperature is greater than the engine limit water temperature or the actual hydraulic oil temperature is greater than the hydraulic limit oil temperature, the idle speed is increased so that after the engine idle speed is increased, the actual water temperature is less than the engine limit water temperature and the actual hydraulic oil temperature is less than the hydraulic limit oil temperature.

4. The adaptive automatic idle speed control method according to claim 3, characterized in that: Assume that the ambient temperature is T, the engine speed is N, and the actual engine water temperature is T 水 , the actual hydraulic oil temperature is T 油 ; The engine water temperature limit is T 水限 , hydraulic limit oil temperature is T 油限 When the engine enters the idle state, the engine speed decreases by Δn, and the idle speed is set to N 怠 , predict that at ambient temperature T, the actual engine water temperature after the speed is reduced by Δn is T 水 And the actual hydraulic oil temperature T 油 , if T 水 >T 水限 or T 油 >T 油限 , then increase the idle speed N 怠 , so that after the engine idle speed, the actual engine water temperature is T 水 Greater than the engine limit water temperature is T 水限 , Actual hydraulic oil temperature T 油 Greater than the hydraulic limit oil temperature is T 油限 .

5. The adaptive automatic idle speed control method according to claim 2, characterized in that: The use of the air conditioner adjusts the idle speed: when the air conditioner is turned on, if the fan speed is less than the speed currently required by the air conditioner, the idle speed is increased so that the air conditioner operation is not affected after the engine idle speed is increased.

6. The adaptive automatic idle speed control method according to claim 5, characterized in that: The engine speed is N, and the fan speed is N f , the ambient temperature is T, the air conditioner setting temperature is T k When the engine enters the idle state, the engine speed decreases by Δn, and the idle speed is set to N d , predict the fan speed N after the speed decreases by Δn at ambient temperature T f If the fan speed is lower than the minimum speed required by the current air conditioner, increase the idle speed N 怠 , so that the air conditioner will not be affected after the engine idles.

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