JP2002201977A - Engine output controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the lowering of an engine speed from a time immediately after the operation of an air conditioner. SOLUTION: When an ECU 8 detects the operation of an air conditioner compressor 6 by a switch 7, the output of the engine 1 is increased, and the output is further increased and corrected corresponding to a rotating speed of the engine 1 during a predetermined period from the detection of the operation of the air conditioner compressor 6, whereby the output of the engine 1 is properly increased from a time immediately after the operation of the air conditioner, and the variation of the rotating speed of the engine immediately after the operation of the air conditioner can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine output control device for appropriately increasing the output of an engine when an air conditioner is operating and maintaining a predetermined rotation speed.

[0002]

2. Description of the Related Art In an automobile in which an air conditioner compressor is driven by an engine, when the air conditioner is operated during idling operation, the output of the engine is reduced by the amount of driving the air conditioner compressor, and the engine speed fluctuates. Therefore, conventionally, as shown in, for example, Japanese Utility Model Application Laid-Open No. 2-46041, when the air conditioner is operated, the engine output is increased and corrected in accordance with the refrigerant pressure of the air conditioner (in accordance with the air conditioner load), and the air conditioner is operated during the air conditioner operation An output control technique for suppressing fluctuations in the engine speed has been proposed. Thereby, even during the operation of the air conditioner, the fluctuation of the engine speed is suppressed, and the engine speed can be stabilized.

[0003]

However, in the above-described conventional output control, the engine speed tends to fluctuate immediately after the operation of the air conditioner. This is considered to be due to the shortage of the increase correction amount for correcting the engine output by the inertia energy of the air conditioner compressor immediately after the operation of the air conditioner. Therefore, only by increasing the engine output according to the air conditioner load as in the conventional output control, it is not possible to cope with the inertial energy of the air conditioner compressor, and it is not possible to suppress the fluctuation of the engine speed immediately after the operation of the air conditioner. Was.

[0004] The present invention has been made in view of the above circumstances, and has as its object to provide an engine output control device capable of preventing a change in engine speed immediately after the operation of an air conditioner.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention increases the output of the engine when the air conditioner operating state is detected by the air conditioner operating state detecting means, and increases the operating state of the air conditioner. For a predetermined period of time, the output of the engine is further increased and corrected in accordance with the rotation speed of the engine, and the engine output is appropriately increased immediately after the operation of the air conditioner to prevent fluctuations in the engine rotation speed. .

In a preferred embodiment of the present invention, the air conditioner output correction means includes an air conditioner load correction amount calculated when the air conditioner is in operation, and an engine speed calculated for a predetermined period after the air conditioner is in operation. It is preferable that the engine output is increased and corrected based on the value obtained by adding the air-conditioner on-time correction amount according to the air conditioner. In this case, the air-conditioner load correction and the correction corresponding to the inertia energy of the air-conditioner compressor are performed. It can be easily compatible.

In another preferred embodiment, the air conditioner correction means increases the engine output in accordance with the air conditioner refrigerant pressure when the air conditioner is in an operating state. , And the stability of the engine speed can be further improved in addition to the correction corresponding to the inertia energy of the air conditioner compressor.

The invention according to claim 2 holds the increase correction amount corresponding to the engine speed for a predetermined period after the air conditioner is activated, and increases the increase correction amount according to the engine speed after the predetermined period has elapsed. The correction amount is gradually reduced, and the control for increasing the output is ended without causing a sudden change in the engine speed or a shock while reliably preventing a change in the engine speed immediately after the operation of the air conditioner.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration of an engine provided with an output control device according to an embodiment of the present invention, FIG. 2 is a flowchart of output control, and FIG. Changes over time are shown.

As shown in FIG. 1, one end of an intake manifold 2 is connected to an intake port of the engine 1, and the other end of the intake manifold 2 opens and closes an intake passage according to a depression state of an accelerator pedal or the like. A control type throttle valve 3 is provided. The opening of the throttle valve 3 is detected by a throttle position sensor 4. The engine 1 is provided with a crank angle sensor 5 for detecting a crank angle.
Can be detected (engine speed detecting means).

An air conditioner compressor 6 for operating the air conditioner is provided, and the air conditioner compressor 6 is driven by the engine 1. The air conditioner compressor 6 is provided with a compressor switch (hereinafter, referred to as a switch) 7. The operation of the air conditioner compressor 6 is detected by turning on and off the switch 7, and the operation or non-operation of the air conditioner is detected (air conditioner operating state detecting means). .

An electronic control unit (ECU) 8 is provided in the vehicle. The ECU 8 includes an input / output device, a storage device for storing a control program, a control map, and the like, a central processing unit, and a timer and counters. ing. ECU8
Thus, comprehensive control of the engine 1 including output control is performed (engine output correction means). The ECU 8 determines the fuel injection mode, the fuel injection amount, the ignition timing, and the like based on the detection information from the various sensors, and controls the driving of the fuel injection valve, the ignition plug, and the like.

In the ECU 8, the opening of the throttle valve 3 detected by the throttle position sensor 4 (or the accelerator opening detected by an accelerator opening sensor not shown) and the engine speed detected by the crank angle sensor 5. Based on Ne, the idling operation (establishment of the idling condition) is determined.

During idle operation, when the switch 7 is turned on and it is detected that the air conditioner is operating, the throttle valve 3 is opened in accordance with the engine speed Ne to increase the engine output. To increase the amount of intake air. Further, during a predetermined period after the switch 7 is turned on, the throttle valve 3 is further driven to the opening side in accordance with the engine speed Ne in consideration of the inertia force of the air conditioner compressor 4 to increase the intake air amount.
The output of the engine 1 is further corrected for increase. At this time, an increase correction amount for further increasing the output of the engine 1 is held for a predetermined period, and after the predetermined period has elapsed, the increase correction amount is gradually reduced.

Thus, the fluctuation of the engine speed Ne due to the load of the air conditioner can be suppressed, and the output of the engine 1 can be appropriately increased immediately after the operation of the air conditioner with the energy of the inertia force of the air conditioner compressor 6 compensated. As a result, fluctuations in the engine speed Ne can be prevented. Further, it is possible to terminate the control for increasing the output of the engine 1 without causing a sudden change in the engine speed Ne or a shock while reliably preventing the engine speed Ne from fluctuating immediately after the operation of the air conditioner.

During idle operation, the engine 1 is controlled by controlling the throttle valve 3 to increase the amount of intake air.
Is appropriately increased, but at this time, the fuel amount is also increased in accordance with the increased intake air amount. Further, in an engine having a configuration in which an idle speed is controlled by providing a bypass, an idle speed control valve is controlled to increase an intake air amount during idle operation.

The above output control situation will be specifically described with reference to FIGS.

At step S1, it is determined whether or not the idle condition is satisfied. When it is determined at step S1 that the idle condition is satisfied, it is determined whether or not the switch 7 is turned on at step S2 (whether or not the air conditioner is activated). No) is determined. If it is determined in step S2 that the switch 7 is on (t1 in FIG. 3), the air conditioner is activated during the idling operation, so the base correction amount K is determined in step S3.
Calculate _B. Base correction amount K _B is a correction amount for increasing the intake air quantity to on the basis of the refrigerant pressure or the like to increase the output during air conditioner operation. After calculating the base correction amount K _B, to calculate the increase correction amount K _ON to increase the intake air amount to increase the further output immediately after air conditioner operation according to the engine speed Ne at step S4.

[0019] Here, the base correction amount K _B is the refrigerant pressure and the operating mode, the load corrected by range or the like of the transmission are properly set, increasing the correction amount K _ON the engine speed
High Ne (Air conditioner compressor 6 for engine)
The inertia of the engine is large) when the engine speed is increased
Low Ne (Air conditioner compressor 6 for engine)
Is small when the inertia force is small). Incidentally, by setting the base correction amount K _B, the relationship between the increase in the correction amount K _ON and the engine speed Ne is not uniquely determined.

After calculating the increase correction amount K _ON in step S4, it is determined in step S5 whether or not the air conditioner is in the operating state within a predetermined time T (from t1 to t2 in FIG. 3).
If it is determined in step S5 that the time is within the predetermined time T,
In step S6, the correction amount K _{AC is set} to the base correction amount K _B + the increase correction amount K _ON (the state of the solid line from t1 to t2 in FIG. 3), and the air amount is increased based on the correction amount K _AC .

Therefore, the correction amount K _AC is equal to the base correction amount K.
The output of the engine 1 is increased by adding the increase correction amount K _ON in addition to _B (the state of the dotted line from t1 to t2 in FIG. 3), and the fluctuation of the engine speed Ne due to the air conditioner load can be suppressed. At the same time, immediately after the operation of the air conditioner, the output of the engine 1 can be appropriately increased in a state where the energy of the inertial force of the air conditioner compressor 4 is compensated.

If it is determined in step S5 that it is not within the predetermined time T, that is, it is after t2 in FIG. 3, it is determined in step S7 whether the increase correction amount K _ON is zero. If it is determined that the increase correction amount K _ON is not 0, step S8
Then, the predetermined value α is subtracted from the previous increase correction amount K _ON to obtain a new increase correction amount K _ON (K _ON = K _ON -α), and the process proceeds to step S6 to continue. However, when K _ON = K _ON -α becomes a negative value, it is set to 0.

Each time the processing in steps S7 and S8 is performed, the increase correction amount K _ON is gradually decreased until the increase correction amount K _ON in step S6 becomes 0, and the increase correction amount K _ON is gradually reduced. As a result, the increase in the output of the engine 1 for the increase correction amount K _ON immediately after the operation of the air conditioner gradually decreases, and the predetermined time T
There consisting Upon expiration of the (at in Figure 3 t3) increase of the output of only minute based on the base correction amount K _B.

Accordingly, the control for increasing the output of the engine 1 immediately after the operation of the air conditioner without causing a sudden change in the engine speed Ne or a shock while reliably preventing the fluctuation of the engine speed Ne immediately after the operation of the air conditioner is terminated. Can be.

If it is determined in step S1 that the idle condition is not satisfied, and if it is determined in step S2 that the switch 7 is not on (off), the process proceeds to step S9, where the correction amount K _AC is reduced. Return to 0 and return.

In the above-described output control device, the engine output is increased and corrected when the air conditioner is operating, so that the fluctuation of the engine speed Ne due to the air conditioner load can be suppressed. Then, the engine output is further increased and corrected according to the engine speed Ne for a predetermined time T after the air conditioner is activated, so that it corresponds to the inertia energy at the time of starting the air conditioner compressor 6 which changes according to the engine speed Ne. As a result, the engine output can be appropriately increased, and the fluctuation of the engine speed Ne immediately after the operation of the air conditioner can be reliably prevented.

[0027] Then, the engine speed Ne and the base correction amount K _B is calculated, and air conditioning is calculated between been activated in a predetermined time T when the air conditioner is in operation
The engine output is increased and corrected based on the value obtained by adding the increase correction amount K _ON according to the above. Therefore, the engine output increase correction due to the air conditioner load and the engine output increase correction corresponding to the inertia energy of the air conditioner compressor 6 are performed. It can be easily compatible. The base correction amount K _B
Is set to increase the engine output in accordance with the refrigerant pressure when the air conditioner is in the operating state, so that the air conditioner load correction with high accuracy can be performed, and the correction corresponding to the inertia energy of the air conditioner compressor 6 can be performed. In addition, the stability of the engine speed Ne can be further improved.

[0028]

According to the engine output control device of the present invention, the output of the engine is increased when the air conditioner operating state is detected by the air conditioner operating state detecting means, and a predetermined time is set after the air conditioner is operated. During the period, the engine output is further increased and corrected in accordance with the engine speed, so that the engine output can be appropriately increased immediately after the operation of the air conditioner. As a result, it is possible to prevent a change in the engine speed immediately after the operation of the air conditioner.

According to the second aspect of the present invention, the increase correction amount corresponding to the engine speed is maintained for a predetermined period after the air conditioner is activated, and after the predetermined period elapses, the increase correction amount is set according to the engine speed. Since the increase correction amount is gradually reduced, it is possible to end the control of the output increase without causing a sudden change in the engine speed or a shock while reliably preventing a change in the engine speed immediately after the air conditioner is activated. Will be possible.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of an engine including an output control device according to an embodiment of the present invention.

FIG. 2 is a flowchart of output control.

FIG. 3 is a time chart showing a temporal change of an output correction amount of an engine.

[Explanation of symbols]

 Reference Signs List 1 engine 2 intake manifold 3 throttle valve 4 throttle position sensor 5 crank angle sensor 6 air conditioner compressor 7 compressor switch (switch) 8 electronic control unit (ECU)

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 11/10 F02D 11/10 H (72) Inventor Norihiko Watanabe 5-33-8 Shiba 5-chome, Minato-ku, Tokyo No. Mitsubishi Motors Industry Co., Ltd. No. 8 F-term in Mitsubishi Motors Corporation (reference) 3G065 AA11 CA05 CA13 DA04 DA15 EA03 FA03 GA10 GA37 GA41 GA46 HA21 HA22 KA02 3G084 BA05 BA13 CA03 DA11 EA07 FA00 FA10 FA33 FA38 3G093 BA02 CA04 CA08 DA01 DA06 DB25 EA05 EA09 EC03 3G301 JA04 KA07 KA10 LA03 NE08 NE16 NE23 PA11Z PE01Z PE03Z PF03Z PF13Z

Claims (2)

[Claims] 1. An air conditioner operating state detecting means for detecting an operation non-operation of an air conditioner; an engine speed detecting means for detecting an engine speed; and the air conditioner being operated by the air conditioner operating state detecting means. While the output of the engine is increased when detected, the output of the engine is further increased in accordance with the engine speed detected by the engine speed detecting means for a predetermined period after the air conditioner is activated. An engine output control device, comprising: engine output correction means for increasing and correcting. 2. The engine output correction means according to claim 1, wherein the engine output correction means holds an increase correction amount according to the engine speed for a predetermined period after the air conditioner is activated, and after the predetermined period elapses, An engine output control device having a function of gradually decreasing an increase correction amount according to the engine speed.