JPS61132749A - Engine throttle valve controller - Google Patents

Abstract

PURPOSE:To avoid torque shock for drivability improvement by installing a throttle opening correcting device to correct an aimed throttle opening degree set by a throttle opening setting device in response to output from an auxiliary apparatus driving detector. CONSTITUTION:A throttle opening setting device sets an aimed throttle opening degree in response to output from accelerator detector. An auxiliary apparatus driving detector finds out if auxiliary apparatuses are driven or not during moving. A throttle opening correcting device is installed to make bigger an aimed throttle opening degree set by a throttle opening setting device, when the auxiliary apparatuses are driven, in response t output from the auxiliary apparatus driving detector. Thus, torque shock can be avoided for better drivability.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a throttle valve control device for an engine, and in particular, the throttle valve opening (i.e. intake air amount)
The present invention relates to a throttle valve control device for electrically controlling a throttle valve.

(Prior Art) Conventionally, as a technology for controlling the air-fuel ratio of the engine to a predetermined air-fuel ratio with respect to the accelerator operation amount indicating the required engine output,
As shown in Japanese Patent Application Laid-Open No. 51-138235, there is an accelerator detecting means for detecting the amount of accelerator operation, and a device receiving the output of the accelerator detecting means adjusts the air to be supplied to the engine so that a preset air-fuel ratio is achieved. Accelerator operation includes a throttle opening setting means for setting a target value, that is, a target throttle opening, and a throttle driving means for receiving the output of the throttle setting means and controlling the opening of the throttle valve according to the output. A system is known in which a target throttle opening degree (that is, a target air amount) is determined according to the amount of air, and the opening degree of the throttle valve is controlled so as to reach the target throttle opening degree.

In many cases, an engine is attached with auxiliary equipment that drives a large load, such as an alternator, an air conditioner compressor, and a supercharging pump in a supercharger type supercharging device. Among these auxiliary equipment, those that are used only in a specific operating range or non-regularly, such as supercharging pumps and air conditioner combufrestors, may be turned on while driving. There are many possible cases where this is the case.

Therefore, in the case where the throttle valve K is electrically controlled to set the target throttle opening according to the amount of accelerator operation as described above, auxiliary equipment such as the supercharging pump mentioned above may be turned ON while driving. If this is the case, the engine torque will suddenly and temporarily drop, resulting in a torque shock.

(Object of the invention) The present invention has been made in consideration of the above-mentioned circumstances.
Even if the auxiliary equipment is turned on while driving, this will prevent a sudden drop in engine torque and turn on the auxiliary equipment.
An object of the present invention is to provide a throttle valve control device for an engine that is capable of preventing torque caused by the engine.

(Structure of the Invention) In order to achieve the above object, in the present invention, when the auxiliary equipment is turned on while driving, the torque required to drive the auxiliary equipment is compensated. In order to achieve this, the target throttle opening degree, which is set according to the amount of accelerator operation, is corrected to be increased.

Specifically, as shown in FIG. 1, there are provided an accelerator detection means for detecting the amount of accelerator operation, and a throttle/slot opening degree setting means for receiving the output of the accelerator detection means and setting a target throttle opening degree. , a throttle drive means that receives the output of the throttle opening degree setting means and drives a throttle valve according to the output; and auxiliary equipment that detects whether or not the auxiliary equipment driven by the engine is driven while the vehicle is running. drive detection means;

Throttle opening correction that receives an output from the auxiliary equipment drive detection means and corrects the target throttle opening set by the throttle opening setting means when the auxiliary equipment is driven while driving. The configuration includes means and.

With this configuration, the intake air amount is increased in accordance with the throttle opening correction amount, that is, the throttle opening correction amount added to the target throttle opening degree, and as a result, the engine torque increases. Torque shock when starting to drive auxiliary equipment is prevented.

(Example) Hereinafter, an example of the present invention will be explained based on the attached drawings.

In FIG. 2, reference numeral 1 denotes an engine body, and in this embodiment, the engine body 1 rotationally drives a crankshaft 5 as an engine output shaft via a connecting rod 4 by reciprocating movement of a piston 3 within a cylinder 2. It is said to be a response type.

An intake boat 7 and an exhaust port 8 are opened in the upper part of the combustion chamber 6 defined by the cylinder 2 and the piston 3, and the intake boat 7 is opened by an intake valve 9, and the exhaust port 8 is opened by an exhaust valve 10, Via the timing cam, which stands for
Each of them is opened and closed in synchronization with the rotation of the crankshaft 5.

The intake boat 7 is connected to an air cleaner 12 via an intake passage 11, and the intake passage 11 is equipped with an air flow meter 13, a positive displacement type (Höhn type in this embodiment), sequentially from the upstream side (air cleaner 12 side). supercharging pump 14, water-cooled or air-cooled intercooler 15, throttle valve 16
, a fuel injection valve 17 is provided. A bypass passage 18 is provided in such an intake passage 11, and a flow end of the bypass passage 18 is connected to the supercharging pump 14.
On the hill flow side and downstream of the air fucometer 13,
Further, the downstream side thereof is the downstream side of the intercooler 15 and the J:IR side of the throttle/cooling valve 16, which are respectively opened to the intake passage 11. An electromagnetic on-off valve 19 is connected to the bypass passage 18, and the electromagnetic on-off valve 19 works in conjunction with the supercharging pump 14 to open when the supercharging pump 14 is OFF, that is, not being driven. It is now possible to do so. That is, the supercharging pump 14 is turned on.
During non-supercharging, the intake air flows through bypass passage 1.
8, the supercharging pump 1
4 does not create suction resistance, and the 4427 passage 18 is closed during supercharging when the supercharging pump 14 is driven.

The supercharging pump 14 is mechanically driven by the crankshaft 5, and in the embodiment, a pulley 20 provided on the crankshaft 5, a winding member 21 such as a timing belt, a pulley 22, an electromagnetic crankshaft, etc. Power is now transmitted via 23, l/X.

24 in FIG. 2 is a control unit consisting of a microcomputer, and this control unit 24 includes:
Signals from each sensor 25, 26, 27 are input, and a signal from the control unit 24 is input to the fuel injection valve 1.
7. In addition to the electromagnetic on-off valve 19 and the electromagnetic clutch 23, the signal is output to an actuator 28 such as a step motor that drives the throttle valve 16.

Among the above-mentioned sensors z5 to 27, sensor 24 is an air amount sensor that detects the amount of intake air at the time of intake. Further, the sensor 26 is a rotation speed sensor that detects the engine rotation speed Ne. The rough sensor 27 is an accelerator sensor that detects the operation amount ACP of the accelerator pedal 29.

Next, the content of control by the control unit 24 will be explained with reference to FIGS. is a supercharging pump 14, and the ON (driving) and OFF (stopping) of this supercharging pump 14 is performed by continuing the electromagnetic clutch 23. This turning on of the supercharging pump 14 (connection of the electromagnetic clutch 23) is performed when the engine rotation speed Ne is a predetermined rotation speed or more and the engine load (accelerator operation amount) is a predetermined value or more. . Further, the electromagnetic on-off valve 19 is closed when the electromagnetic clutch 23 is connected, and opened when the electromagnetic clutch 23 is disconnected. Note that the fuel injection amount is determined in a well-known manner based on, for example, the intake air amount and the engine rotation speed Ne.

First, in FIG. 3, the accelerator operation amount ACP from the accelerator sensor 26 is determined by the target throttle opening setting means 30.
is input. This target throttle opening degree setting means 30 calculates a target throttle opening degree T)IA according to the accelerator sensor ACP from a predetermined map, and this target throttle opening degree T)IA is input to an adder 31. here,
This will be corrected as described below. Then, this corrected target throttle opening degree T)(B) is input to the throttle actuator drive circuit 32, and the throttle valve 28 is set to the opening degree according to the corrected opening degree TH8.

On the other hand, the accelerator operation amount ACP and the engine speed Ne are input to the supercharging pump ON@OFF determination module 33 in FIG. Determine whether to turn it off. If it is determined that the supercharging pump 14 is to be turned on, the drive signal APON is applied to the electromagnetic clutch drive circuit 34.
The electromagnetic clutch 23 is connected (driving the supercharging pump 14). At the same time, the signal APON for driving the supercharging pump 14 is input to the throttle opening correction module 35, where the throttle opening correction TI (G) is calculated, and the throttle opening correction module 35 calculates the corrective throttle opening correction module 35. The opening degree THC is output to the adder 31.

In this way, the corrected throttle opening THE output from the adder 31 is the value obtained by adding the corrective (additional amount) throttle opening THC to the target throttle opening THA.

Next, the functions of the determination module 33 and correction module 35 described above will be described in detail with reference to the flowchart shown in FIG. Note that the supercharging pump 14 is
As shown in the shaded area in Figure 5, when the engine speed Ne is 1
It is turned ON only when the accelerator operation amount ACP is larger than 50 Orpm and larger than a predetermined value, and in order to prevent hunting of ON and OFF of the supercharging pump 14 due to minute changes in the accelerator operation amount ACP. , the ON condition for the supercharging pump 14 is greater than the upper limit value Acpu, and the OFF condition for the supercharging pump 14 is the lower limit value A, which is slightly smaller than the above upper limit value A CPU.
It is considered to be smaller than CPD.

First, in step S1, the accelerator position, that is, the accelerator operation amount ACP is read, and then in step 2, the engine rotation speed Ne is read, and then in step 3, it is determined whether the engine rotation eNe is larger than 1500 rpm. This engine rotation speed Ne is 1500 rpm
If it is not larger than that, it is an operating range in which the supercharging pump 14 is not driven, so in step 4, the supercharging pump 14 is
is turned OFF (electromagnetic clutch 23 disconnected).

On the other hand, in step 3, the engine rotation speed Ne is 150O
If it is determined that the supercharging pump 14 is larger than the rpm, it is determined in step 5 whether or not the supercharging pump 14 is currently ON, that is, is being driven. When it is determined that the supercharging pump 14 is not currently turned on, it is determined in step 6 whether or not the accelerator sensor ACP is larger than a predetermined upper limit value A CPU that is a prerequisite for turning on the supercharging pump 14. be done. This accelerator sensor ACP is
When it is determined that it is larger than IJ, in step 7, a correction amount throttle opening THC is calculated based on the carrot rotation speed Ne (see FIG. 6). After this, in step 7, the throttle opening Tl(G
(to the adder 31), the supercharging pump 14 is turned on in step 9 (connection of the electromagnetic clutch 23).In addition, in step 7, the engine speed Ne
The reason why the throttle opening correction amount THG is adjusted in accordance with is that the smaller the engine rotation speed Ne, the larger the rate of torque fluctuation caused by turning on the supercharging pump 14.

When it is determined in step 5 that the supercharging pump 14 is being driven, in step 10 it is determined whether the accelerator sensor AGP is smaller than the lower limit value ACPD, and if ACP or ACP[l is smaller than , step,
The supercharging pump 14 is turned off (disconnecting the electromagnetic clutch 23).

In addition, when it is determined in step 6 that the accelerator sensor ACP is not larger than the upper limit value ACPU, and when it is determined that it is not smaller than the lower limit value ACPD, the supercharging pump 14 is turned ON or OFF. It will be returned without any action.

The effect of the above embodiment will be explained using the graph shown in FIG. 7. In the figure, (a) shows the change in the accelerator operation amount, (b) shows the change in the throttle opening, and (C) shows the change in the supercharging pump 14. (d) shows the change in engine torque. In FIG. 7, if the accelerator sensor ACP is increased at time 1, the throttle opening THB is also increased accordingly. Then, at time t2, which is slightly delayed from time t1, the correction amount of throttle opening THC is added to the target throttle opening THA, so that a sudden drop in engine torque due to turning on of the supercharging pump 14 is prevented. This prevents torque shock.

The added correction amount of THC is shown in the shaded area in FIG. 7(b), and the increase in engine torque due to this correction molecule HC is shown in the shaded area in FIG. 7(d). Incidentally, the above-mentioned correction of the throttle opening is finished at time t3.Incidentally, if the above-mentioned correction using THC is not performed, the throttle opening degree is After time t2', which corresponds to time t2 in Figure 7, the engine torque will drop sharply.

Although the embodiments have been described above, when the control unit 24 is configured with a microcomputer, it may be of either an analog type or a digital type.

Further, the auxiliary equipment to be corrected for the throttle opening degree is not limited to the supercharging pump 14, but may be any suitable equipment such as an air conditioner compressor, as long as it is turned ON while the vehicle is running.

(Effects of the Invention) As is clear from the above description, the present invention can prevent torque shock when driving engine auxiliary machinery while the vehicle is running, thereby providing a desirable improvement in drivability.

[Brief explanation of drawings]

FIG. 1 is an overall block diagram of the present invention. FIG. 2 is an overall system diagram showing an embodiment of the present invention. FIG. 3 is an overall block diagram showing a control example of the present invention. FIG. 4 is a flowchart showing a control example of the present invention. FIG. 5 is a diagram showing the operating range of a supercharging pump as an engine accessory. FIG. 6 is a diagram showing the amount of correction of the throttle opening degree with respect to the engine speed. FIG. 7 is a diagram schematically showing the control contents according to the present invention. FIG. 8 is a diagram corresponding to FIG. 7 in the case where the throttle opening degree is not corrected. l: Engine 14: Supercharging pump (auxiliary equipment) 16: Throttle valve 23: Electromagnetic Clara≠ 27: Accelerator sensor 28: Throttle actuator 29: Accelerator pedal 24: Control unit 30: Target throttle opening setting means 32: Throttle actuator Drive circuit 33: Supercharging pump ON-ON judgment module 34: Electromagnetic clutch drive circuit 35: Throttle opening correction module Fig. 4 Fig. 5 Fig. 6

Claims (1)

[Claims] (1) Accelerator detection means for detecting the amount of accelerator operation; Throttle opening setting means for receiving the output of the accelerator detection means and setting a target throttle opening; and receiving the output of the throttle opening setting means for setting the target throttle opening. a throttle driving means for driving a throttle valve according to the engine; an auxiliary machinery drive detecting means for detecting whether or not auxiliary machinery driven by the engine is driven while the engine is running; Throttle opening correction means receives the output and corrects the target throttle opening set by the throttle opening setting means in the direction of increasing when auxiliary equipment is driven while driving. An engine throttle valve control device characterized by: