JPH0255852A - Idling speed controller - Google Patents

Abstract

PURPOSE:To hold idling speed at the time of engine starting down to such a low one that will not cause an engine stall or the like but keep a degree of cooling capacity by controlling the opening of an idling speed control valve on the basis of the final request cooling capacity and the request cooling capacity either. CONSTITUTION:At the time of engine starting, an estimated value of an idling speed control valve(ISCV) 17 calculated on the basis of a deviation TAO between request cooling capacity found on the basis of each signal out of respective sensors 12-14, and a temperature setting volume 15 and final request cooling capacity at time just before the last engine stop is added to the final valve opening, whereby opening of the ISC valve 17 is controlled, while a variable capacity mechanism 18a is controlled by compressor capacity calculated on the basis of the request cooling capacity. With this constitution, idling speed at the time of engine starting can be held down to such a low one that will not cause any engine stall or the like but keep the cooling capacity.

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to an idle speed control device for a vehicle engine, and more specifically, in a vehicle equipped with a cooling device, the idle speed is prospectively controlled in accordance with a cooling load that indirectly applies a load to the engine during cooling. This relates to a control device.

[Conventional technology]

Generally, a vehicle cooling system is equipped with a compressor driven by a driving engine, and in this cooling system, the capacity of the compressor is controlled to be switched to high, low, or stopped based on the evaporator outlet temperature that makes up the refrigeration cycle. The temperature inside the vehicle is now regulated. In such a cooling system, the compressor is operated at a small capacity to reduce air pollution and save power due to turning the compressor on and off. In a vehicle equipped with such a cooling device, an idle speed control device that changes the idle speed of the engine according to the compressor capacity, that is, the cooling load, is disclosed in Japanese Patent Laid-Open No. 135953/1983. are disclosed. [Problems to be Solved by the Invention] However, the above control device is configured to control the idle rotation speed in a steady state, and the idle rotation speed at the time of startup is not controlled by the rotation speed itself, but by controlling the flow rate of the air-fuel mixture or the rotation speed itself. This controls the amount of intake air, and since there are differences in the drop in rotational speed depending on the cooling load, it is necessary to set it higher to prevent engine stalling when the cooling load is large, which goes against conventional power saving measures. There is a problem with becoming a thing. This invention was made to solve the above-mentioned problems, and its purpose is to reduce power consumption while maintaining the cooling capacity by reducing the idle rotation speed at the time of engine startup in a vehicle equipped with a vehicle cooling system. An object of the present invention is to provide an idle rotation speed control device that can control the rotation speed to a low level that does not cause stalling or the like. [Means for Solving the Problems] In order to achieve the above object, the present invention detects a physical quantity related to a cooling load applied to a cooling device whose driving source is a driving engine of an automobile, as shown in FIG. Detection means 1
a cooling capacity calculation means 2 which calculates the required cooling capacity based on the signal from the detection means 1; an idle control valve 3 which controls the amount of intake air in the idle operating state of the engine; and an idle control valve 3 which determines the required cooling capacity just before the engine is stopped. a storage means 4 for storing the opening amount of the idle control valve 3 immediately before the engine stops as the final required cooling capacity and the final opening amount; an opening amount setting means 5 for setting the opening amount of the idle control valve 3 based on the required cooling capacity calculated by the cooling capacity calculating means 2; The gist thereof is an idle rotation speed control device including a control means 6 for controlling a control valve 3. [Operation] The detection means detects a physical quantity related to the cooling load applied to the cooling device, and the cooling capacity calculation means calculates the required cooling capacity based on the signal from the detection means. The opening amount setting means sets the opening amount of the idle control valve based on the final required cooling capacity and final opening amount stored in the storage means and the required cooling capacity calculated by the cooling capacity calculation means, and the control means The opening degree of the idle control valve is controlled based on the opening degree set by the degree setting means, and the amount of intake air is adjusted. [Example] An example embodying the present invention will be described below with reference to FIGS. 2 to 5. As shown in FIG. 2, the air conditioner amplifier 11 includes an outside temperature sensor 12 that detects the outside temperature of the vehicle, an inside temperature sensor 13 that detects the inside temperature of the vehicle, a solar radiation sensor 14 that detects the amount of solar radiation, and a temperature inside the vehicle. A temperature setting volume 15 for setting the temperature is connected. The air conditioner amplifier 11 includes a cooling capacity calculation means, a storage means,
Control circuit as opening amount setting means and control means (hereinafter referred to as
An idle control valve (hereinafter referred to as ISO Pulp) is connected to the ECU 16, and on the output side of the ECU 16 there is an idle control valve (hereinafter referred to as ISO Pulp) that controls the amount of intake air when the engine is in idle operation.
17 are connected. Further, a variable capacity mechanism 18a of an air conditioner amplifier +18 is connected to the output side of the ECU 16, and a relay 19 for turning on and off the magnetic clutch of the compressor 1B is also connected. The ECU 16 has each sensor 12-14. Based on the signal from the temperature setting volume 15, the required cooling capacity TAO of the cooling device (the path shown) corresponding to the cooling load at the time is determined. Further, the ECU 16 sets the required cooling capacity TAO immediately before the engine stops shown in FIG. 5(a) as the final required cooling capacity, and sets the opening amount of the ISC valve 17 immediately before the engine stops shown in FIG. It is memorized as a measurement. When the ECU 16 starts the engine, each sensor 12-14.
5 (a) based on the signal from the temperature setting volume 15.
), the required cooling capacity is determined, and the deviation ΔTAO between the determined required cooling capacity and the final required cooling capacity (immediately before the previous engine stop) is determined. Then, the ECU 16 uses the deviation ΔTAO as shown in FIG. 4(a).
The expected opening amount of the lSC pulp 17 is calculated from the relationship shown by the solid line in , and the calculated expected amount of the lSC pulp 17 is added to the final opening amount, as shown in FIG. 5(b). The ISC opening degree at the time of starting the engine is determined. Furthermore, the EC1J16 calculates the compressor capacity from the relationship shown by the solid line in Fig. 4(d) based on the calculated required cooling capacity, and obtains the compressor capacity as shown in Fig. 5(d). Then, the ECU 16 controls the opening degree of the lSC pulp 17 to adjust the idle rotation speed at the time of starting, and
The variable capacity mechanism 18a of the compressor 18 is controlled to adjust the compressor capacity at startup. Further, the ECU 16 controls each sensor 12 to 14 . during the transient period and steady state of the engine. Based on the required cooling capacity obtained from the signal from the temperature setting volume 15, as shown in FIG. 4 (C).
The opening amount of 15CI7 is sequentially calculated from the relationship shown by the solid line in FIG. 4(d), and the compressor capacity is sequentially calculated from the relationship shown by the solid line in FIG. 4(d). and,
The ECU 16 controls the opening degree of the ISC pulp 17 to adjust the idle rotation speed, and also controls the variable capacity mechanism 18a of the compressor 18 to adjust the compressor capacity. In addition, the relationships shown by solid lines in Figures 4(a) to (d) are for when the air conditioner mode (A/C mode) is selected, and the relationships shown by broken lines are for when the economy mode (ECON mode) is selected. The relationships shown are used. Next, the processing executed by the ECU 16 will be explained based on the flowchart shown in FIG. First, in step 31, the outside temperature sensor 12. Inside temperature sensor 13. In addition to inputting the signals from the solar radiation sensor 14 and the temperature setting volume 15, the final required cooling capacity TAO immediately before the previous engine stop and the final opening amount of the lSC pulp 17 are input, and in the next step 32, each sensor 1
2-14. The required cooling capacity TAO is calculated based on the signal of the temperature setting polyneem 15. In the subsequent step 33, it is determined whether the start flag N indicating the engine starting time is "O", that is, whether the engine is starting. If the determination is affirmative, the process proceeds to step 34, where the deviation ΔTAO between the required cooling capacity TAO calculated in step 32 and the final required cooling capacity TAO is calculated, and the process proceeds to step 35. In the next step 35, based on the deviation ΔTAO calculated in the step 34, lSC is determined from the relationship shown in FIG.
The expected opening degree of the pulp 17 is calculated and the compressor capacity is calculated based on the required cooling capacity TAO as shown in the graph of FIG. ”. In the following step 37, the opening degree of the ISC pulp 17 is controlled to adjust the amount of intake air, and the variable capacity mechanism 18a of the compressor 18 is controlled to change the discharge capacity of the compressor 18, and the process proceeds to step 31. Then, in step 31, the outside temperature sensor 1
2. Signals from the inside temperature sensor 131, solar radiation sensor 14, and temperature setting volume 15 are input, and in step 32, the required cooling capacity TAO at that time is calculated. Next step 33
Since the start flag N is set to "1" in step 36, it is determined that the state is in a transition period or a steady state, and the process proceeds to step 38. In step 38, based on the required cooling capacity TAO calculated in step 32, lSC is calculated from the relationship shown in FIG. 4(C).
After calculating the opening degree of the pulp 17 and calculating the compressor capacity from the relationship shown in FIG. 4(d) based on the required cooling capacity TAO, the process proceeds to step 37 to control the opening degree of the ISO valve 17. to adjust the amount of intake air, and also to adjust the variable capacity mechanism 1 of the compressor 18.
8a to change the discharge capacity of the compressor 18,
The process moves to step 31, and thereafter steps 31 and 32
．． 33, 38, and 37 are repeatedly executed. In this way, in this embodiment, each of the sensors 12 to 14. The required cooling capacity is determined based on the signal from the temperature setting volume 15, and the deviation ΔTAO between the determined required cooling capacity and the final required cooling capacity immediately before the previous engine stop is determined, and the ISO is calculated based on the deviation ΔTAO. The opening amount of the ISC valve 17 is set by adding the expected amount of pulp 17 and the final valve opening degree, and the opening amount of the ISC valve 17 is controlled, and the capacity is variable by the compressor capacity calculated based on the required cooling capacity. Since the mechanism 188 is controlled, the cooling capacity of the air conditioner can be maintained at the engine start-up (N=O) as shown in FIG. 5(C), and no stall occurs. It can be the number of rotations. Further, in this embodiment, when the engine shifts to a transition period and a steady state, each of the sensors 12 to 14 . Temperature setting volume 15
Based on the required cooling capacity obtained from the signal from the
) The compressor capacity shown in ) is feedback-controlled. Therefore, the opening amount of the ISC valve 17 decreases stepwise toward a predetermined value, and the ISO valve 17 is controlled based on this opening amount, so that the idle speed of the engine is reduced as shown in FIG. 5 (C1). , it is possible to maintain a stable rotation speed while maintaining the cooling capacity of the cooling device, and it is possible to save power of the engine. [Effects of the Invention] As described in detail above, according to the present invention, when starting the engine, This has the excellent effect of suppressing the idle rotation speed of the engine to a low rotation speed that does not cause stalling while maintaining cooling capacity.

[Brief explanation of the drawing]

Fig. 1 is a diagram corresponding to the claims of this invention, Fig. 2 is a block diagram showing an embodiment embodying this invention, Fig. 3 is a flowchart for explaining the operation, and Fig. 4 is for explaining the operation. In the same figure, (al is a diagram showing the relationship between the estimated ISC valve capacity and the required cooling capacity deviation at the time of engine starting, and the same figure (bl is a diagram showing the relationship between the compressor capacity and the required cooling capacity at the time of engine starting. Figure (C) shows the relationship between the ISC opening degree and required cooling capacity when the engine is steady; Figure (d) shows the relationship between the compressor capacity and the required cooling capacity when the engine is steady. 5 are waveform diagrams for explaining the action. In the figures, 1 is a detection means, 2 is a cooling capacity calculation means, 3 is an idle control valve, 4 is a storage means, and 5 is an opening amount setting means. , 6 is a control means, 12 is an outside temperature sensor as a detection means, 13
14 is the same indoor temperature sensor, 14 is the solar radiation sensor, 15
Similarly, 16 is a temperature setting volume, and 16 is a cooling capacity calculation means and a storage means. A control circuit 17 serves as an opening amount setting means and a control means, and is an idle control valve. N=0 △TAO 'rA. N=0 AO AO

Claims (1)

[Scope of Claims] 1. A detection means for detecting a physical quantity related to a cooling load applied to a cooling device driven by a vehicle's driving engine; and a cooling capacity for determining a required cooling capacity based on a signal from the detection means. a calculation means; an idle control valve for controlling the amount of intake air in the idle operating state of the engine; and an idle control valve that stores the required cooling capacity immediately before the engine stops as the final required cooling capacity, and stores the opening amount of the idle control valve immediately before the engine stops as the final required cooling capacity. a storage means for storing the opening amount; and setting the opening amount of the idle control valve based on the final required cooling capacity and final opening amount stored in the storage means and the required cooling capacity calculated by the cooling capacity calculation means. An idle rotation speed control device comprising: an opening amount setting means; and a control means for controlling the idle control valve based on the opening amount set by the opening amount setting means.