JPH1182078A - Electric controlled throttle device for v-type internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the control precision of throttle opening in switching of valve timing, and improve the operability by correcting a target opening in conformation to an average valve timing when the valve timing is shifted between banks in the transition of the valve timing switching. SOLUTION: The cam phases on bank 1A, 1B side are detected by use of cam angle sensors 4A, 4B and crank angle sensors 5, and the average value of the respective detected cam phases is calculated. When the responsiveness is differed between banks in variable valve timing mechanisms 2A, 2B, a slippage of timing is transitionally caused between the banks in the switching of valve timing. Therefore, a correction quantity for correcting the change of new air ratio by the valve timing is set to correct a target opening. The correction quantity is set, for example, by the cam phase, target torque, or engine rotating speed at that time.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronically controlled throttle device for a V-type internal combustion engine, and more particularly to a technique for correcting a target opening of a throttle valve according to valve timing.

[0002]

2. Description of the Related Art Conventionally, a throttle valve is opened and closed by an actuator such as a motor, and a target air amount is set from a target torque set based on an accelerator operation amount, a vehicle speed, and the like, and the target air amount is obtained. 2. Description of the Related Art There is known an electronically controlled throttle device configured to electronically control the opening of a throttle valve to a predetermined opening.

[0003]

If the engine provided with the electronically controlled throttle device has a variable valve timing mechanism for changing the valve timing, the fresh air ratio changes depending on the valve timing. It is necessary to correct the target opening according to the valve timing.

However, in the case where the internal combustion engine is a V-type engine and has a configuration in which a hydraulically controlled variable valve timing mechanism is provided for each bank, timing switching is performed due to a difference in responsiveness between banks to a switching signal. In the transient state, the valve timing may be shifted between the banks (see FIG. 4). As described above, when there is a deviation in valve timing between banks, if the correction according to the fresh air ratio is adapted to one bank, the optimum correction can be performed by the difference in the fresh air ratio in the other bank. There was a possibility that driving performance was deteriorated.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems, and it is possible to appropriately correct the target opening in accordance with the valve timing even if the response of switching the valve timing differs between banks. The purpose is to.

[0006]

Therefore, the invention according to claim 1 is provided with a variable valve timing mechanism for changing the valve timing according to the operating condition for each bank, and the target opening set according to the operating condition. In an electronically controlled throttle device for a V-type internal combustion engine that controls the throttle valve opening degree,
The target opening is corrected in accordance with the valve timing by the variable valve timing mechanism, and the target opening is corrected in accordance with an average value of the valve timing for each bank.

According to this configuration, if a shift in valve timing occurs between banks during a transition of switching valve timing, the target opening is corrected in accordance with the average valve timing. According to the second aspect of the present invention, the average value of the valve timing for each bank is determined, and the correction amount of the target opening is set based on the average value.

According to this configuration, the valve timing is detected for each bank, the average value is obtained, and the correction amount of the target opening is set according to the average value of the valve timing. According to the third aspect of the invention, a correction amount is set for each bank in accordance with the valve timing, and the target opening is corrected based on an average value of the correction amounts.

According to this configuration, the valve timing is detected for each bank, and the correction amount corresponding to each valve timing is individually set for each bank. Then, an average value of the correction amounts obtained for the respective banks is calculated, and the target opening is corrected based on the average value.

[0010]

According to the first aspect of the present invention, even if the switching response of the valve timing is different between the banks,
Appropriate correction corresponding to the change in the fresh air ratio due to the valve timing can be made to the target opening, thereby improving the control accuracy of the throttle opening when switching the valve timing and improving the drivability. This has the effect.

According to the second aspect of the invention, there is an effect that the target opening can be properly corrected by using the average value of the valve timing between the banks as the valve timing in the engine at that time. According to the third aspect of the present invention, there is provided a method for controlling the valve timing corresponding to the valve timing of each bank.
There is an effect that the target opening can be properly corrected by using the average value of the two required correction amounts as the appropriate correction amount in the engine at that time.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram illustrating a system configuration of an engine according to an embodiment. An internal combustion engine 1 is a V-type engine including two banks, and each bank 1A and 1B changes the opening / closing timing of an intake valve. Variable valve timing mechanisms 2A and 2B are provided.

The variable valve timing mechanism 2A, 2B
Is for changing the cam phase while keeping the operating angle constant by hydraulic control, and turning on / off the control solenoids 3A and 3B by a control signal from the control unit 3.
By performing FF, the hydraulic path changes, and the closing timing of the intake valve is changed. Further, cam angle sensors 4A and 4B are provided on the intake side camshafts of the respective banks, and the cam angles are determined based on the detection signals from the cam angle sensors 4A and 4B and the detection signals from the crank angle sensor 5. The phase can be detected for each bank.

On the other hand, an electronically controlled throttle device for opening and closing a throttle valve 6 interposed in an intake passage common to each bank by a motor 7 is provided.
It is driven according to an opening control signal from the control unit 3. The control unit 3 sets a target opening of the throttle valve 6 and performs feedback control of an opening control signal output to the motor 7 so that an actual opening matches the target opening.

The setting of the target opening is performed, for example, as follows. First, a target torque is set based on the accelerator operation amount and the vehicle speed, and a target fuel amount and a target air-fuel ratio are set based on the target torque and the engine speed. Then, a target air amount is set based on the target fuel amount and the target air-fuel ratio, and an opening corresponding to the target air amount is set as a target opening. The method for setting the target opening is not limited to the above.

When the opening / closing timing of the intake valves is switched by the variable valve timing mechanisms 2A and 2B, the fresh air ratio changes, and the demand for the target opening corresponding to the target air amount changes. Therefore, it is necessary to correct the target opening (or the target air amount) according to the valve timing, and the correction is performed as shown in the flowchart of FIG.

In the flowchart of FIG. 2, in step 1 (indicated as S1 in the figure, the same applies hereinafter), the cam phase on the bank 1A side is detected using the cam angle sensor 4A and the crank angle sensor 5. I do. Similarly, step 2
Then, the cam phase on the bank 1B side is
B and the crank angle sensor 5 are used for detection.

In step 3, an average value of the cam phases detected in steps 1 and 2 is calculated. In the variable valve timing mechanisms 2A and 2B, if there is a difference in responsiveness between the banks, a timing shift occurs between the banks at the time of switching the valve timing (see FIG. 4). Therefore, in the steady state, the cam phases detected in the steps 1 and 2 are substantially the same, but in the transition transition,
A difference occurs in the cam phases. In step 3, the average value of the cam phases (valve timings) of both banks is calculated at the time of the switching transition.

In step 4, a correction amount for correcting a change in the fresh air ratio due to the valve timing is set according to the average value of the cam phase (valve timing).
The correction amount can be set according to, for example, the cam phase (valve overlap), the target torque, and the engine speed at that time. In step 5, the target opening (or the target air amount) is corrected according to the correction amount obtained in step 4.

As described above, if the target opening is corrected based on the average value of the cam phase (valve timing) for each bank, a timing shift occurs between the banks when the valve timing is switched. However, the correction corresponding to the average valve timing (fresh air ratio) of the engine can be performed, and the target opening can be appropriately corrected. In the embodiment shown in the flowchart of FIG. 2, the cam phase (valve timing) in each bank 1A, 1B.
Although the average value is calculated, the correction amount of the target opening may be set as shown in the flowchart of FIG.

In the flowchart of FIG.
At 11, the cam phase on the bank 1A side is detected using the cam angle sensor 4A and the crank angle sensor 5. In step 12, a correction amount of the target opening is set based on the detected cam phase on the bank 1A side. In the next step 13, the cam phase on the bank 1B side is detected using the cam angle sensor 4B and the crank angle sensor 5.

In step 14, a correction amount of the target opening is set based on the detected cam phase on the bank 1B side. In Step 15, the above Step 12, Step
The average value of the correction amount corresponding to the cam phase (valve timing) of each bank 1A, 1B set in 14 is calculated. In step 16, the target opening is corrected based on the average correction amount calculated in step 15.

In the above description, the cam phase (valve timing) or the average value of the correction amount is always calculated.
An average value may be obtained only when there is a cam phase (valve timing) deviation between banks, and a target opening may be corrected according to the cam phase (valve timing) in one bank when there is no deviation. good.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram showing an engine according to an embodiment.

FIG. 2 is a flowchart showing how target opening is corrected in accordance with valve timing.

FIG. 3 is a flowchart showing another example of the target opening correction according to the valve timing.

FIG. 4 is a diagram showing responsiveness of switching valve timing for each bank.

[Explanation of symbols]

 Reference Signs List 1 engine 1A, 1B bank 2A, 2B variable valve timing mechanism 3 control unit 3A, 3B control solenoid 4A, 4B cam angle sensor 5 crank angle sensor 6 throttle valve 7 motor

Continued on the front page (51) Int.Cl. ⁶ Identification code FI F02D 43/00 301 F02D 43/00 301K 301Z (72) Inventor Hiroshi Iwano 2 Takaracho, Kanagawa-ku, Yokohama-shi, Kanagawa Prefecture Nissan Motor Co., Ltd. (72) Inventor Masayuki Yasuoka 2 Takaracho, Kanagawa-ku, Yokohama, Kanagawa Prefecture Inside Nissan Motor Co., Ltd. (72) Inventor Taiyo 2 Takaracho, Kanagawa-ku, Yokohama City, Kanagawa Prefecture Nissan Motor Co., Ltd.

Claims (3)

[Claims] A variable valve timing mechanism for changing a valve timing according to an operating condition is provided for each bank;
An electronically controlled throttle device for a V-type internal combustion engine that controls a throttle valve opening to a target opening set according to operating conditions, wherein the target opening is corrected according to valve timing by the variable valve timing mechanism. And correcting the target opening in accordance with the average value of the valve timing for each bank.
Electronically controlled throttle device for internal combustion engines. 2. An electronically controlled throttle for a V-type internal combustion engine according to claim 1, wherein an average value of the valve timing for each bank is obtained, and a correction amount of the target opening is set based on the average value. apparatus. 3. The V-type internal combustion engine according to claim 1, wherein a correction amount corresponding to the valve timing is set for each bank, and the target opening is corrected based on an average value of the correction amounts. Electronically controlled throttle device.