JP2002021599A - Control system for Otto cycle engine for vehicles - Google Patents

Abstract

(57) [Problem] A small and lightweight engine that can compensate for an increase in engine output during idling operation as necessary without using an idle speed control valve or the like, which is a separate component from a throttle valve, to avoid engine stall. A control device is provided. An idle-up actuator (7) for increasing and correcting the opening of a throttle valve (2) at a fully closed position is provided. A rotation sensor for detecting the number of revolutions of the engine, a neutral sensor for detecting whether the drive system is neutral, a throttle position sensor 10 for detecting the opening of the throttle valve, and a vehicle speed sensor for detecting the vehicle speed are provided. By providing a control unit 9 for increasing and correcting the output of the engine by operating the idle-up actuator 7 in response to the operating condition of the engine detected via the output of each sensor, the throttle valve is provided with an idle-up function. The Otto cycle engine was made smaller and lighter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an Otto cycle engine for a vehicle, and more particularly to a control device capable of preventing an engine stall by increasing the torque during idling operation as required. is there.

[0002]

2. Description of the Related Art In order to avoid engine stall of an Otto cycle engine for a vehicle, an idle speed control valve which is normally kept closed is conventionally connected in parallel to a throttle valve. When an auxiliary device such as an air conditioner, a power steering or an AT torque converter is driven during an idle operation in which the throttle valve is closed, a so-called idle-up operation is performed by opening the idle speed control valve. At the same time, an attempt was made to cope with an increase in the load caused by driving the auxiliary equipment.

However, in order to avoid engine stall when, for example, a plurality of accessories are driven at the same time, it is necessary to provide an idle speed control valve having a large capacity to secure an increase in engine output. Accordingly, it is necessary to provide a large-capacity, large-capacity idle speed control valve even for an Otto cycle engine for a vehicle that is required to be reduced in size and weight.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and requires no large-capacity idle speed control valve, which is a separate component from the throttle valve. It is an object of the present invention to provide a small and lightweight control device capable of avoiding engine stall by increasing the engine output.

[0005]

According to the present invention, there is provided an idle-up actuator for increasing the opening of a throttle valve in a fully closed position. A rotation sensor for detecting the number of rotations of the engine;
A neutral sensor that detects whether the drive system is neutral, a throttle position sensor that detects the opening of the throttle valve, and a vehicle speed sensor that detects the vehicle speed are provided, respectively, and detected through the output of each of the sensors. A control unit is provided which operates the idle-up actuator in response to an operating condition of the engine to increase and correct the output of the engine.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a schematic configuration diagram showing one embodiment of a control device for a vehicle Otto cycle engine according to the present invention.

In FIG. 1, a throttle lever 4 connected via a shaft 3 to a throttle valve 2 provided in an intake passage 1 of an Otto cycle engine (not shown) is shown in FIG.
When swinging to the middle right side, the throttle valve 2 rotates in the same direction and its opening increases, and the output of the engine increases.

Further, by providing an idle adjuster 6 facing the auxiliary lever 5 connected to the shaft 3, if the position of the idle adjuster 6 is moved forward and backward, the maximum return position (fully closed angle) of the throttle valve 2 changes. Thus, the output during idling is adjusted.

Here, in the present embodiment, an idle-up actuator 7 facing the auxiliary lever 5 is provided. The idle-up actuator 7 is composed of, for example, a diaphragm dash pot, and the idle adjuster 6 adjusts the opening of the throttle valve 2 at the fully closed position by causing the tip of the plunger 8 to face the auxiliary lever 5 with play. So that it does not affect

The idle-up actuator 7
Is turned on when an operation signal is output from the control unit 9 to protrude the plunger 8 so that the auxiliary lever 5 is turned clockwise in FIG. The opening degree of the throttle valve 2 is increased and corrected.

The control unit 9 for controlling the idle-up actuator 7 always keeps the idle-up actuator 7 in the OFF operation. And
An opening signal of the throttle valve 2 output from the throttle position sensor 10, a neutral signal output from a neutral detection sensor that outputs a signal indicating whether or not the drive system of the vehicle is neutral, and an output from a vehicle speed sensor that detects the vehicle speed The engine speed is output from a rotation sensor that detects the detected vehicle speed and engine speed, and other signals are input as control information, and idle-up is performed in accordance with the engine operating conditions obtained based on these control information. The output of the engine is optimally controlled by operating the actuator 7 ON-OFF.

FIG. 2 is a flowchart exemplifying the control logic in the control unit 9. In step S1, it is determined whether or not the key switch is turned on. If it is determined that the key switch has been turned on, the process proceeds to step S2 to determine whether or not the engine speed N at that time is higher than a predetermined reference speed n.

If it is determined that the engine speed N is higher than the reference speed n, it is determined that the engine is operating and the process proceeds to step S3, where the vehicle drive system constituted by a manual or automatic transmission is provided. Is determined to be neutral. If it is determined in step S3 that the vehicle is not neutral, the process proceeds to step S4, in which the vehicle speed V is set to a predetermined limit value v
(For example, 5 km / h).

If it is determined in step S4 that the vehicle speed V is lower than the limit value v, the flow advances to step S5 to output an ON signal to the idle-up actuator 2. If it is determined in step S1 that the key switch has not been turned ON, it means that the engine is not operating, and the process proceeds to step S6, where an OFF signal is output to the idle-up actuator 2, and the process proceeds to step S1.
If it is determined in Step 2 that the engine speed N is not higher than the reference speed n, the process proceeds to Step S7 to output an ON signal.

On the other hand, if it is determined in step S3 that the vehicle drive system is neutral, the process proceeds to step S8 to determine whether or not the opening α of the throttle valve 2 (hereinafter referred to as throttle opening) is zero. judge. When it is determined that the throttle opening α is zero due to the return of the accelerator pedal or the like, the process proceeds to step S9, and the elapsed time T from when the accelerator opening α becomes zero is equal to a predetermined delay time t. Determine if it is longer.

If it is determined in step S9 that the elapsed time T is longer than the delay time t, the flow advances to step S10 to output an OFF signal. It is determined that the opening α of the throttle valve 2 is not zero in step S8 and that the elapsed time T from when the accelerator opening α becomes zero is less than the delay time t in step S9. Step S if
Proceed to 7 to output an ON signal.

If it is determined in step S4 that the vehicle speed V is not less than the limit value v, the flow advances to step S11 to determine whether or not the throttle opening α is zero.
Step S12 when the throttle opening α is not zero
To output an ON signal to the idle-up actuator 2, but if the throttle opening α is zero, the flow proceeds to step S13.

In step S13, the time T elapsed since the throttle opening α became zero and the delay time t
If the elapsed time T is longer than the delay time t, the process proceeds to step S6 to output an OFF signal. If it is determined that the elapsed time T is not longer than the delay time t, the process proceeds to step S12 and the ON signal is output. Output.

Incidentally, the idle-up actuator 2 is always kept in the OFF state. Then, when the control unit 9 outputs an ON signal, it is turned ON.
The idle-up actuator operates to perform idle-up, and when an OFF signal is output from the control unit 9, the idle-up actuator is turned off to release idle-up or maintain the OFF state.

That is, since the idle-up is automatically performed at the time of the engine start operation, the startability is improved. The idle-up is also performed during the racing with the vehicle stopped, but the idle-up is canceled after the delay time t has elapsed. Therefore, disturbance of the air-fuel ratio, which is a concern during racing, is suppressed, and engine stall is prevented. Further, when the vehicle speed reference value v is set to an extremely low speed of, for example, about 5 km / h as described above, the start-up performance is improved because the idle-up can be performed even during the creep running of the automatic transmission, for example. Is done.

In the embodiment, the case where the idle-up actuator 7 is constituted by a diaphragm type dashpot is described. However, the throttle valve 2 is operated by positive or negative pressure air, hydraulic pressure, electricity or the like.
Any known actuator can be used as long as the maximum return position is corrected to perform the idle-up operation.

Further, in the embodiment, it is determined whether or not to perform the idle-up based on the state of the key switch, the engine speed, the neutral signal, the throttle position signal, and the vehicle speed. Prevent engine stall by adding drive signals for auxiliary equipment, outside air temperature, air pressure, exhaust gas characteristics, etc. to control information, or changing the degree of idle-up in multiple steps or continuously based on this information. It can also improve fuel economy.

[0023]

As is apparent from the above description, according to the present invention, by increasing the opening of the throttle valve in accordance with the operating condition of the engine, the idle-up operation is carried out, and the output during low-speed (idle) operation is performed. To prevent engine stall by increasing the load, so that even when a plurality of accessories such as an air conditioner, power steering or an AT torque converter are driven at the same time, an increase in the load can be avoided. The intended purpose can be achieved only by changing the return position of the throttle valve provided as the output adjusting means of the cycle engine. Therefore, there is no need to provide a large-capacity idle speed control valve or the like to secure an increase in engine output unlike the related art.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing one embodiment of a control device for a vehicle Otto cycle engine according to the present invention.

FIG. 2 is a flowchart illustrating a control logic in the control unit shown in FIG. 1;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Intake passage 2 Throttle valve 3 Shaft 4 Throttle lever 5 Auxiliary lever 6 Idle adjuster 7 Idle up actuator 8 Plunger 9 Control unit 10 Throttle position sensor

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Claims (1)

[Claims] In an Otto cycle engine in which the output is variably controlled by changing the opening of a throttle valve, an idle-up actuator for increasing and correcting the opening of the throttle valve in a fully closed position, and a rotation speed of the engine , A neutral sensor that detects whether the drive system is neutral, a throttle position sensor that detects the opening of the throttle valve, a vehicle speed sensor that detects the vehicle speed, and an output of each of the sensors. A control device for an Otto cycle engine, comprising: a control unit that operates the idle-up actuator in response to an operating state of the engine detected through the control unit to increase and increase the output of the engine.