JP2591369B2 - Resonant supercharging control method for vehicle engine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resonance supercharging control method for a vehicle engine, in which resonance supercharging is actively used to improve the acceleration performance of a vehicle.

[0002]

2. Description of the Related Art In an intake system of an automobile, resonance supercharging is performed between an intake valve and a throttle valve of an engine by utilizing intake pulsation. In other words, a large positive pressure wave is generated by resonance, supercharging is performed, and the output is improved.

However, as shown in FIG. 6, this resonance supercharging is effective when the engine is at a certain engine speed, that is, when the engine is in a steady state. This is because the engine state in which the resonance effect can be used is in a certain limited range (a certain engine rotation speed ± 100 rpm).

Therefore, the resonance supercharging effect has hardly been used in an excessive state such as acceleration. In particular, automatic transmission vehicles (hereinafter referred to as A / T vehicles) have a stall region in which the engine rotation speed is constant during acceleration, but the resonance supercharging effect has not been used effectively.

[0005] Under such circumstances, variable resonance supercharging in which the volume of the intake system of the engine is variable has been implemented. That is, the engine speed and the like are detected, and the volume of the intake system is changed accordingly.

[0006]

However, as shown in FIG. 7, even if the engine speed is detected and the volume of the resonance tube is changed based on the detected engine speed, there is a response delay. The increase effect sometimes did not match. That is, it did not sufficiently contribute to the improvement of the acceleration performance.

[0007]

In order to solve the above-mentioned problems, the present invention detects an acceleration state of a vehicle, and obtains a map of a predetermined intake engine speed and a target intake system volume in anticipation of a response delay. The target intake system volume is determined, and the volume of the intake system is variably controlled to achieve the target intake system volume.

[0008]

In this method, the volume of the intake system is controlled so that resonance supercharging occurs at a higher rotation speed in anticipation of a response delay. Therefore, even if there is a response delay, the volume of the intake system follows the target value. Thus, the acceleration can be improved by the resonance supercharging effect without delay.

[0009]

FIG. 1 schematically shows a resonance supercharging control device for carrying out a method according to an embodiment. Reference numeral 1 denotes an engine, reference numeral 2 denotes an intake manifold connected to an intake port of the engine 1, reference numeral 3 denotes an intake pipe connecting an air cleaner 4 and the intake manifold 2, and a throttle valve 5 is provided in the middle thereof.

A resonator 6 is connected to an intake pipe 3 constituting an intake system. That is, the intake manifold 2, the intake pipe 3, and the resonator 6 constitute a resonance pipe. A partition plate 7 is provided in the resonator 6.
The capacity can be changed by moving. The movement of the partition plate 7 is performed by an actuator 8 provided above the resonator 6.

On the other hand, the electronic control unit 9 includes an engine speed Ne, detected by an engine speed sensor,
Throttle opening θt detected by throttle sensor
Is entered. The electronic control unit 9 stores a map selected according to the state of the vehicle. FIG. 3 shows a map for acceleration (Map 1), and FIG. 4 shows a map for steady running (Map 2). In the electronic control unit 9, the target resonator volume Va is read from the maps 1 and 2 based on the engine rotation speed Ne, and this is commanded to the actuator 8 which is a drive system of the resonator 6.

Next, an example of the control will be described with reference to the flowchart of FIG. First, the engine speed sensor detects the engine rotation speed Ne and the throttle opening sensor detects the throttle opening θt, and inputs them to the electronic control unit 9 (steps (1) and (2)).

The electronic control unit 9 determines whether or not the vehicle is accelerating from the change in the throttle opening θt (step (3)). If it is determined that the vehicle is not in the accelerated state, the vehicle is in the steady state.
The target resonator volume Va is obtained based on the map 2 shown in FIG. 3 and is instructed to the actuator 8 (step (5)), and the volume of the resonator 6 is controlled, that is, the volume of the resonance tube is controlled.

If it is determined in step (3) that the vehicle is accelerating, the process proceeds to step (6), and the target resonator volume Va is obtained from the map 1 for acceleration based on the engine rotation speed Ne. . The target resonator volume Va is set so as to resonate at an engine speed higher than the actual engine speed in anticipation of a response delay of the actuator 8. That is, control is performed in advance to prevent a response delay.

The control command is issued to the actuator 8 so that the obtained target resonator volume Va becomes the same as in the steady state (step (5)).

By controlling in anticipation of the response delay as described above, as shown in FIG. 5, the resonance tube volume follows the target value, and acceleration without delay is obtained by resonance supercharging.

In the above embodiment, the volume is changed by moving the partition plate 7 in the resonator 6, but the volume can be changed by other methods, for example, by tilting or raising a large number of partition plates. And various other methods can be adopted.

[0018]

According to the resonance supercharging control method for a vehicle engine according to the present invention, the acceleration state of the vehicle is detected, and the volume of the resonance tube is controlled in anticipation of a response delay. Acceleration without stagnation in the rotational speed of the vehicle is obtained, the acceleration performance is improved, and the riding feeling is improved.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a resonance supercharging control device used for implementing one embodiment.

FIG. 2 is a flowchart of one embodiment.

FIG. 3 is a map diagram for acceleration.

FIG. 4 is a map diagram for normal use.

FIG. 5 is an explanatory diagram of a resonance supercharging effect according to the present invention.

FIG. 6 is an explanatory diagram of a conventional resonance supercharging state.

FIG. 7 is a schematic diagram showing a delay of a conventional resonance supercharging effect.

[Description of Signs] 1 Engine 2 Intake manifold 3 Intake pipe 4 Air cleaner 5 Throttle valve 6 Resonator 7 Partition plate 8 Actuator 9 Electronic control unit

Claims (1)

(57) [Claims] The volume of an intake system of an engine is made variable,
A resonance supercharging control method for a vehicle engine in which a resonance supercharging effect is variably obtained, wherein a target intake system which detects an acceleration state of a vehicle and allows for a predetermined engine rotation speed and a response delay. A resonance supercharging control method for a vehicle engine, wherein a target intake system volume is determined from a map of the volume and a volume of the intake system is variably controlled to achieve the target intake system volume.