JPH0354331A - Control device for engine intake throttle valve - Google Patents

Abstract

PURPOSE:To improve responsiveness by providing a valve opening lever for pressing a throttle valve arm to an opening direction of a throttle valve, press-returning arm in a closing direction, reset spring, hit to a stopper in an idle position, in the valve opening lever secured to a step motor while a return spring, acting in throttle valve closing, in the return arm rotatably mounted to a shaft. CONSTITUTION:For instance, when a water release dial is turned, voltage in accordance with a rotational amount is input to a control unit 20 by a governor sensor 18, and a signal 21 of a predetermined number of steps is output to a step motor 5. In this way, when a program is prepared so that the motor 5 opens a throttle valve 2, a throttle valve arm 4 is pressed by a valve opening lever 7 so as to increase opening of the throttle valve 2 when a water release amount is increased, and the valve opening lever 7 is turned to a stopper 9 in an idle position by a reset spring 10 when the release amount is decreased, then the throttle valve arm 4 is pressed by a return spring 15 with a return arm 13 to decrease the opening of the throttle valve 2. Since the throttle valve is placed in a predetermined idle position by the stopper, operation can be performed at a proper speed in accordance with a load of an equipment without a response delay.

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention relates to a control device that opens and closes a throttle valve for intake control to an appropriate position when a vehicle engine is operated to drive equipment when the vehicle is stopped. It is used to control the opening and closing of engine intake throttle valves in fire engines, power-supply vehicles, etc.

(Prior art) When a fire engine sprays water at a fire scene, a water spray dial is turned and the engine drives the bomb, pressurizing the water for consumption.

Further, when the power source vehicle supplies starting power for a helicopter, for example, the engine drives a generator to generate electric power.

When such equipment such as bombs and generators are driven by a vehicle engine, the vehicle such as a fire truck or power supply vehicle is stopped and the engine is in an idle state, so the throttle valve is adjusted depending on the operating state of the equipment. must be opened and the engine must be operated at a rotational speed that corresponds to the load.

FIG. 3 shows a currently employed throttle valve control device. For example, in the case of a fire engine, a throttle valve 31 of a carburetor that supplies fuel to the engine is attached to the shaft end of a throttle valve shaft 32. Throttle valve arm 33 is stuck. The output shaft of a step motor 34 is disposed on the same axis as the throttle valve shaft 32, facing the throttle valve shaft 32. When a water discharging dial (not shown) is turned, the governor lever 37 rotates in the clockwise direction shown in the drawing via a wire and separates from the governor switch 38, and at the same time, the governor sensor 39 interlocked with the governor lever 37 rotates and outputs a voltage according to the amount of rotation. This voltage is sent to the electronic control device 35 as an electric signal corresponding to the amount of operation of the water discharge dial, which sends a drive signal for a predetermined number of steps to the step motor 34, which drives the valve opening lever 40 fixed to its output shaft.
pushes the throttle valve arm 33 and operates the step motor 34 to open the throttle valve 31 to a predetermined opening degree.

In such a control device, when the throttle valve 3l is placed at the idle position and the water discharge dial starts to be turned from the zero position, the step motor 34 is once driven in the opposite direction to correspond to the fully open position of the throttle valve 31. The system is designed to rotate the valve opening lever 40 until it hits the start position switch 41 installed at the - position (-).In other words, the governor switch 38 detects the start of operation and controls the step motor 34 to open the throttle valve. After the start position switch 41 detects and confirms this, the step motor 34 is rotated in the opening direction of the throttle valve 31 using a drive signal of a predetermined number of steps.

Therefore, when the step motor 34 starts operating, the throttle valve 31 is not opened until the valve-opening lever 40 reaches the idle position from the fully closed position of the throttle valve 31, resulting in a delay in response.

(Problems to be Solved by the Invention) The main object of the present invention is to solve the above-mentioned problem that the electronic governor system that opens the throttle valve in the idle position in conjunction with the drive of equipment has poor responsiveness. The object of the present invention is to provide a control device for an engine intake throttle valve that has excellent responsiveness and is simple in construction.

(Means for Solving the Problems) A governor sensor that detects the operating state of equipment driven by an engine, an electronic control device that outputs a drive signal of a predetermined number of steps based on an electric signal from the governor sensor, and In order to solve the above-mentioned problems of an engine intake throttle valve control device that includes a step motor that rotates the throttle valve in response to a drive signal, the present invention has taken the following measures.

That is, it includes a valve opening lever that pushes the throttle valve arm fixed to the throttle valve shaft in the throttle valve opening direction, a return arm that pushes the throttle valve arm in the throttle valve closing direction, and a stopper that stops the valve opening lever at the idle position of the throttle valve. . The valve opening lever is fixed to the output shaft of the step motor and is acted on by a return spring that acts in the direction of hitting the stopper.The return arm is rotatably attached to the output shaft and closes the throttle valve. A return spring acting in the direction is acting.

(Function) When you start driving equipment while the vehicle is stopped and the engine is in an idle state, an electrical signal corresponding to the operating state of the equipment is sent from the Gapana sensor to the electronic control circuit, which then controls the step A drive signal is sent to the motor. The step motor is returned to the position where the valve opening lever hits the stopper by the spring force of the return spring, and the return arm is rotated by the spring force of the return spring to the position where the throttle valve arm hits the valve opening lever. In this state, the throttle valve is in the idle position.The 6g movement signal should be programmed so that the valve opening lever corresponding to the idle position pushes the throttle valve arm and rotates it in the throttle valve opening direction. This allows the throttle valve to open at the same time as the step motor starts operating. (Example) An example of the present invention will be described with reference to the drawings.

1 and 2 show an example in which the present invention is implemented to control a throttle valve 2 of a carburetor 1 that supplies fuel to a fire engine engine. is fixed, and the output shaft 6 of the step motor 5 is disposed on the same axis, facing the throttle valve shaft 3.

A valve opening lever 7 is fixed to the output shaft 6, and its arm portion 7
a is adapted to contact and engage with one side surface of the throttle valve arm 4, and the contact portion 7b is adapted to impact against a stopper 9 made of a threaded rod screwed onto a bracket 8 attached to the carburetor 1 or the step motor 5. Further, one end 10b on the opposite side of the return spring 10, which is a torsion coil spring loosely wound around the output shaft 6 and one end 10a fixed to the casing of the step motor 5, engages with the valve opening lever 7. The abutting portion 7b applies a rotational force in the direction of striking the stopper 9.
Therefore, when the step motor 5 stops operating, the spring force of the return spring 10 causes the valve opening lever 7 to rotate clockwise in FIG. The machine will stop at the specified position.

A nut 11 is screwed and fixed to the shaft end of the output shaft 6.
A guide sleeve 12 integral with this nut 11 surrounds the output shaft 6 and reaches near the valve opening lever 7. A return arm 13 is rotatably fitted into the guide sleeve 12, and a protective sleeve 14 integrated with the return arm 13 is overlapped with the guide sleeve 12, and an arm portion 13a is attached to the other side of the throttle valve arm 4. Further, one end 15a of a return spring 15 made of a torsion coil spring loosely wound around the protective sleeve 14 engages with the valve opening lever 7, and one end 15b of the opposite side engages with the return arm 13. Together, they apply a rotational force to the return arm 13 in the direction of pushing the throttle valve arm 4 and closing the throttle valve 2. For this reason, arm 1
3a is always engaged with the throttle valve arm 4, and when the force to open the throttle valve 2 is removed, the spring force of the return spring 15 rotates the throttle valve 2 in the closing direction. When the valve opening lever 7 hits the stopper 9, the throttle valve arm 4 is pushed by the return arm 13 and rotates until it hits the arm portion 7a, and at that time the throttle valve 2 is placed at the idle position.

Therefore, by adjusting the position of the stopper 9, the idle position of the throttle valve 2 can be arbitrarily adjusted. Further, the return spring 15 can also serve as a throttle valve closing spring, which is generally provided on the throttle valve shaft 3.

On the other hand, a governor sensor 18 that is linked with a governor lever 17 that locks the tip of a wire that is pulled by turning a water discharging dial rotates in accordance with the amount of rotation of the governor lever 17, and a voltage corresponding to the amount of rotation is sent as an electric signal l9. The drive signal 21 is input to the equation control device 20, which outputs a drive signal 21 of a predetermined number of steps to the step motor 5.

When spraying water at a fire scene, the fire engine is stopped and the engine is idle. At this time, the throttle valve 2 is placed at the predetermined idle position set by the stopper 9, so there is no need to check the starting position. Therefore, in the present invention, the step motor 5 is driven by the drive signal 21.
A program is created so that the throttle valve arm 4 is immediately pushed and the throttle valve 2 is rotated in the direction to open it, and the throttle valve 2 is opened according to the amount of operation of the water discharge dial, and the engine is made to perform the operations necessary to drive the bomb. . When the water discharge amount increases, the valve opening lever 7 pushes the throttle valve arm 4 to increase the opening degree of the throttle valve 2, and when the water discharge amount decreases, the valve opening lever 7 pushes the throttle valve arm 4 to increase the opening degree of the throttle valve 2.
rotates toward the stopper 9, and the return arm 13 pushes the throttle valve arm 4 to follow the valve opening lever 7, thereby reducing the opening degree of the throttle valve 2. That is, the throttle valve arm 4, the valve opening lever 7
, the return arms 13 operate as a unit and in engagement with each other.

When the fire engine is running, the valve opening lever 7 is placed in an idle position against the stopper 9, and the throttle valve 2 is opened and closed by the driver's accelerator operation. At this time, the throttle valve arm 4 and the return arm 13 operate in a state in which they are integrally engaged with each other.

(Effects of the Invention) According to the present invention, since the throttle valve is placed at a predetermined idle position set by the stopper, there is no need to check the starting position, and even if the throttle valve is opened by the step motor, the equipment The engine can be operated at an appropriate rotational speed according to the load on the engine, and in particular, the equipment can be driven immediately without any response delay, and the combination of the valve opening lever and its return spring, and the return arm and return spring. This makes it possible to open and close the throttle valve using either a step motor or normal accelerator operation. Furthermore, since a governor switch and a start position switch as in conventional products are not required, the configuration is simple and the electronic control system has the advantage of being simplified.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line x-xf1M in FIG. 1, and FIG. 3 is a layout diagram of a conventional example. 2... Throttle valve, 3... Throttle valve shaft, 4... Throttle valve arm, 5... Step motor, 6... Output shaft, 7...
... Valve opening lever, 9... Stopper, 10... Return spring, 13... Return arm, l5... Return spring, 18
...Governor sensor, 20...Electronic control device,

Claims (1)

[Scope of Claims] A governor sensor that detects the operating state of equipment driven by an engine; an electronic control device that outputs a drive signal of a predetermined number of steps based on an electric signal from the governor sensor; In an engine intake throttle valve control device that includes a step motor that rotates the throttle valve; a valve opening lever that pushes a throttle valve arm fixed to the throttle valve shaft in the throttle valve opening direction; and a return arm that pushes the throttle valve in the throttle valve closing direction. and a stopper for stopping the valve opening lever at an idle position of the throttle valve, the valve opening lever being fixed to the output shaft of the step motor and having a return spring acting in a direction against the stopper. The control device is further characterized in that the return arm is rotatably attached to the output shaft and is acted on by a return spring that acts in the throttle valve closing direction.