JPS60138239A - Engine speed controller - Google Patents

Abstract

PURPOSE:To make an idling speed controllable with an inexpensive device, by setting up the opening of an idling speed control valve being installed so as to bypass a throttle valve, on the basis of output of a steering sensor which detects a steering angle or a steering angle speed of a steering shaft. CONSTITUTION:In time of car driving, each output signal out of a steering sensor 32, an engine speed sensor 41 and a car speed sensor 51 is taken in a control circuit 60 which therefore performs each judgment of whether or not an engine speed is below N-rpm, a steering angle speed is below omega deg./sec and a steering angle is above theta deg. in regular sequence. And, when each judgment aforesaid is entirely a 'yes' with the about-face of a car and its garaging or the like, the opening A of an idling speed control valve 20 is set down to the opening (A+K) added with the specified value K, and an air stream quantity passing through a bypass passage 14 bypassing a throttle valve 42 is increased to some extent. In addition, a fuel feed quantity is also increased as much as a portion for increment of the air stream quantity, thus the engine speed is increased.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an engine speed control device for a vehicle equipped with power steering.

[Prior art]

Power steering obtains its assist force from the hydraulic pressure generated by the engine-driven hydraulic pump.
During steering, the engine load increases and the engine speed decreases. Therefore, if the opening degree of the throttle valve is small at that time, the engine speed becomes too low, causing the engine to vibrate or, in extreme cases, to stall the engine.

In order to eliminate such problems, conventional systems sense the oil pressure generated by the hydraulic pump and control the amount of air intake into the engine according to this oil pressure, increasing the amount of air intake into the engine when the hydraulic pump is running. A control device that increases engine speed is used in some cars equipped with power steering.

However, in the case of such a control device, a valve for sensing the oil pressure of the hydraulic pump and controlling the amount of intake air must be provided and piping must be installed, which causes disadvantages in various aspects such as space, weight, and cost.

[Purpose of the invention]

In view of these conventional problems, an object of the present invention is to increase the engine speed when using power steering by utilizing existing parts, thereby eliminating the disadvantages of providing new parts. The objective is to prevent engine vibration and engine stall from occurring.

[Structure of the invention]

In order to achieve this object, the present invention forms a bypass passage in parallel with an intake passage whose intake air port is controlled by a throttle valve, and an idle rotation speed control valve is inserted into this bypass passage. In an engine speed control device that controls the intake air amount to the engine independently of the throttle valve, the idle speed is controlled by a signal from a steering sensor that detects the steering angle or steering angular speed of the steering shaft. The present invention is characterized in that a valve opening setting means is provided which sets the opening of the valve and increases the opening of the idle rotation speed control valve when the steering angle or the steering angular velocity increases.

〔Effect of the invention〕

According to the present invention, the engine speed of a vehicle equipped with power steering is increased using the existing steering sensor and idle speed control valve, so that the oil pressure of the hydraulic pump is detected and the intake air amount of the engine is controlled. There is no need to install a new valve to control the engine, and it is possible to prevent the occurrence of engine capture and engine stall in vehicles equipped with power steering without incurring disadvantages in terms of space, weight, cost, etc.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic configuration diagram of an embodiment, where 11
is an engine body, and a throttle valve 12 is inserted into an intake passage 13 of the engine body.
By adjusting the opening degree of 2, the amount of intake air supplied to the engine via the intake passage 13 is controlled. Note that a surge tank 15 is provided downstream of the intake passage 13, and intake air is distributed from there to each cylinder of the engine.

A bypass passage 14 is provided in parallel with the intake passage 13 including the throttle valve 12, and an idle speed control valve 20 is provided in the bypass passage 14. The idle rotation speed control valve 20 is mainly composed of a pulse motor, and the rotor of the pulse motor is a valve body 21. When the valve body 21, which is a rotor, is rotated by excitation of a coil 23, a threaded structure is formed. This allows the valve body 21 to change the opening degree of the boat bored in the valve seat 22. coil 2
3 is adapted to be energized by a pulse signal from the control circuit 60.

The control circuit 60 is constituted by a microcomputer, and its interface circuit 63 receives an engine rotation speed signal from an engine rotation speed sensor 41 provided in the distributor 40 and a steering sensor 32 attached to the steering shaft 31. A steering signal from the vehicle and a vehicle speed signal from a vehicle speed sensor 51 provided in the transmission 50 are respectively input.

A central processing unit (CPU) 61 takes in each signal according to a program stored in a memory 62, performs predetermined calculations, determines the opening degree of the idle speed control valve 20, and outputs the signal via an interface circuit 63. It is output to the idle speed control valve 20 as a pulse signal.

The engine rotation speed sensor 41 detects the rotation of a distributor shaft (not shown) and generates a pulse signal at each predetermined crank angle of the engine.

Further, the steering sensor 32 detects the rotation of the steering shaft 31 and rotates the steering shaft 310.
It generates a pulse signal at every predetermined rotation angle. Further, the vehicle speed sensor 51 detects the rotation of the output shaft (not shown) of the transmission 50 and outputs output shafts 7I to 7I.
It generates a pulse signal every predetermined rotation of the shaft.

A P I:J gram for controlling the opening degree of the idle speed control valve 20 is created as shown in FIG.

When the program shown in Figure 2 is started, first step 1 is executed.
Initialization is performed in step 10, and processing from step 120 onwards is executed. When step 170 is reached, the process of this routine is completed, and from then on, step 1
The processes between step 20 and step 170 are repeatedly executed.

In step 120, it is determined whether or not a flag, which will be described later, is set to "0". If the flag is set to "0" due to the initialization in step 110, an affirmative decision is made in step 120, and the process proceeds to step 131. move on.

In steps 131 to 134, it is determined whether the vehicle speed, engine speed, steering angular velocity, and steering angle are less than or equal to predetermined values.

First, in step 131, it is determined whether the vehicle speed is S km/h or less. Next, in step 132, it is determined whether the engine speed is N.
rpm or less, and in step 133, whether the steering angular velocity is ω degrees/second or more, and further, in step 134, it is determined whether the steering angle is θ degrees or more.

When changing direction of the vehicle or parking the vehicle,
The vehicle speed is low, and the steering angular velocity and steering angle are large (so,
At this time, if the engine speed is low, step 131-
134 are all answered in the affirmative, and the process proceeds to step 141.

However, if a negative determination is made in any of steps 131 to 134 because the engine speed is high or the steering angle is small, the routine proceeds to step 170 and ends the routine.

When all of steps 131 to 134 are answered in the affirmative and the process proceeds to step 141, a predetermined amount K is added to the opening degree A of the idle rotation speed control valve 20 to make the opening degree A ten, and the idle rotation speed The opening degree of the control valve 20 is increased by a predetermined MK. Then, in step 142, the flag is set to 11" and the idle speed control valve 20 is set to 11".
Remember that the opening has been increased.

As a result of executing the process in step 141, when the opening degree of the idle speed control valve 20 is increased, the amount of intake air supplied to the engine through the bypass path I4 is increased, so that the amount of intake air supplied to the engine through the bypass path I4 is increased. The amount of fuel supplied is also increased and the engine speed is increased. For this reason, even if you change direction or park the vehicle while keeping the engine speed low,
This prevents the engine speed from becoming too low due to the power steering load, which increases engine vibration and causes engine stall.

After the opening degree of the idle speed control valve 200 is increased, the flag is set to "1" in step 142, so a negative determination is made in step 120, and the process proceeds to steps 151 and 152, where the steering angular velocity is Then, it is determined whether the steering angle is less than or equal to a predetermined value. First, in step 151, it is determined whether the steering angular velocity is less than or equal to ω' degrees/second, which is smaller than ω in step 133, and in step ]52, it is determined whether the steering angle is less than or equal to θ' degrees, which is smaller than θ in step 134. . Note that here, the reference values of the steering angular velocity and steering angle are set in step 1.
The reason why it is made smaller than that in 33.134 is to provide hysteresis to the operation and prevent hunting from occurring.

When the direction change and parking of the vehicle are completed and both the steering angular velocity and the steering angle become small, an affirmative determination is made in both steps 151 and 152, and the process proceeds to step 161. However, if the steering angular velocity or steering angle has not become smaller, step 1
If either 51 or 152 is negative, step 17
Go to 0.

When steps 151 and 152 are both affirmatively determined and the process proceeds to step 161, the opening degree A of the idle rotation speed control valve 20 is reduced by a predetermined amount, and the opening degree A is
'-. That is, in step 141, the increased amount is decreased again to return to the original state, and the engine speed is lowered. Then, in step 162, the flag is set to "0" to be in the initial state.

Although a specific embodiment of the present invention has been described above, the present invention is not limited to this embodiment, and can be implemented in various ways within the scope of the claims. Some of them are listed below.

A. Using the steering sensor and potentiometer,
It may also be one that generates a signal representing an angle.

B. The opening degree of the idle rotation speed control valve may be made to gradually increase as the steering angle or steering angular velocity increases. Furthermore, the idle speed control valve may be of a type that is switched on or off, rather than one whose opening degree does not change.

C. The idle speed control valve can also be constructed using a linear solenoid whose duty ratio is controlled.

2. Only one of the steering angle and steering angular velocity may be used.

[Brief explanation of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention, and FIG. 12 is a flowchart showing the program contents of a microcomputer forming a control circuit. 11 - Engine body 12 - Throttle valve 13 Intake passage 14 Bypass passage 15 Surge tank 20 Idle speed control valve 21---
Valve body 22 --- Valve seat 23 --- Coil 31 --- Steering shaft 32 --- Steering sensor 40 --- Distributor 41 --- Engine speed sensor 50 --- Transmission 51 ---Vehicle speed sensor 60 ---111 Control circuit Kitaganin Toyota Motor Corporation 2 Figure 2

Claims (1)

[Claims] 1. A bypass passage is formed in parallel with the intake passage whose intake air amount is controlled by a throttle valve, an idle rotation speed control valve is inserted into this bypass passage, and the idle rotation speed control valve controls the throttle speed. It is an engine rotation speed control device that controls the amount of intake air to the engine independently of the valve, and includes a steering sensor that detects the steering angle or steering angular velocity of the steering shaft, and a steering sensor that detects the steering angle or angular velocity of the steering shaft. Valve opening setting means for setting the opening degree of the idle rotation speed control valve according to the steering angle or steering angular velocity, and increasing the opening degree of the idle rotation speed control valve when the steering angle or steering angular velocity increases. An engine speed control device featuring: