JP2014137059A - Mechanical governor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve such the problem that a rotating speed is lowered due to application of a load that a conventional mechanical governor has, by comparatively simple and inexpensive means.SOLUTION: A mechanical governor includes: an actuator 25 connected to a governor arm 23 or a throttle lever 12; a rotation sensor 27 detecting rotation of an engine; and an electronic control device 26 comparing a measured rotational frequency determined on the basis of a detection signal from the rotation sensor 27, with a target rotational frequency predetermined and stored according to a prescribed accelerator opening, and moving at least one of the governor arm 23, the throttle lever 12 and a governor rod 24 in the opening direction against spring force, when a difference exists.

Description

  The present invention relates to an engine fuel supply device, and more particularly to an improvement of a mechanical governor attached to a carburetor.

  2. Description of the Related Art Conventionally, a governor using a mechanical governor and an electronic governor or a combination thereof is known as an engine fuel supply device.

  Of these, the electronic governor is capable of obtaining a target rotational speed in accordance with all engine rotation conditions, and has recently been widely used. However, in order to increase accuracy, many sensors and complicated processing are required. For this reason, there is a problem that the price is likely to be expensive and adjustment is also required, and a cheap one is inferior in responsiveness and likely to cause hunting.

  Mechanical governors, on the other hand, are less expensive than electronic governors and do not require advanced adjustments. They are also excellent in responsiveness, and provide carburetors that supply fuel to a relatively simple engine. It is used for.

  However, in the mechanical governor, the governor arm (lever) is pivotally supported on the governor arm (lever) shaft, the intake metering unit is linked to the governor arm (lever), and the governor arm (lever) is urged by the governor spring. On the other hand, the intake metering section with the throttle lever is adjusted by swinging the governor arm (lever) by the unbalanced moment between the governing force of the governor sleeve and the governor spring force due to the weight propulsion by centrifugal force and the change in wind pressure. As shown in FIG. 5, in the case of a mechanical governor using a governor spring force, the rotational speed of the engine will change when there is no load and a high load, so that the engine performance can be fully demonstrated. I can't. In particular, it is necessary to maintain the same rotation even when the load (load) increases due to the frequency relationship in a generator that generates power by rotating the engine.

  Therefore, a mechanical governor configured such that the pulling force of the governor spring is weakened as the governor weight is propelled as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-338266 has been proposed. Therefore, the adjustment is difficult and the durability is also a problem.

JP-A-8-338266

  An object of the present invention is to solve the problem that the rotational speed is lowered due to the load of the conventional mechanical governor by a relatively simple and inexpensive means.

A mechanical governor according to the present invention, which has been made to solve the above-mentioned problems, includes an actuator connected to at least one of a governor arm, a throttle lever or a governor rod that connects the governor arm and the throttle valve, a rotation sensor that detects the rotation of the engine, The governor arm, throttle lever or governor arm is driven by the actuator when there is a difference between the measured rotational speed obtained from the detection signal from the rotation sensor and the target rotational speed obtained and stored in advance according to a predetermined accelerator opening. And an electronic control device for moving the governor rod connecting the throttle lever in the opening direction against the spring force.

  In the present invention, it is preferable that the rotation sensor for detecting the actually measured rotation speed uses a primary current of the magnet ignition coil of the engine or a rotation sensor installed on the crankshaft of the engine. It is good to obtain | require this rotation speed by the setting frequency or accelerator position signal of a generator.

  According to the present invention, it is possible to maintain a normal rotational speed without lowering the rotational speed even when a load is applied, to sufficiently bring out the engine performance and to maintain the rotation of the generator as well. This eliminates the frequency problem.

Explanatory drawing which shows the state which attached the mechanical governor which is embodiment which concerns on this invention to the vaporizer | carburetor. FIG. 3 is a relationship diagram between a load (POWER) and a rotational speed of the mechanical governor according to the embodiment shown in FIG. 1. Explanatory drawing which shows the state which attached the mechanical governor which is different embodiment of this invention to the vaporizer | carburetor. Explanatory drawing which shows the state which attached the mechanical governor which is further different embodiment of this invention to the vaporizer | carburetor. The relationship figure of the load (POWER) about the conventional mechanical governor and rotation speed.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows a state in which a weight type mechanical governor 2 for a carburetor according to an embodiment of the present invention is connected to a carburetor 1, and the mechanical governor 2 is a shaft extended from an operating means. There is a link means including a governor arm 23 provided with a member so that the tip side can be turned and a governor rod 24 for connecting the tip side to a throttle lever 12 for driving a throttle valve (not shown) of the carburetor 1. The throttle valve (not shown) disposed in the intake passage of the carburetor 1 is opened / closed via the link means.

  Further, a governor spring 22 is stretched on the base end side so as to urge the front end side of the governor arm 23 in the direction of turning the accelerator lever 13 in the valve opening direction. Similarly, there are governor weights 29, which are well-known techniques.

  In the mechanical governor 2 according to the present embodiment, an electric actuator 25 such as a linear solenoid is disposed on the opposite side of the mounting position of the governor rod 24 across the tip side of the governor arm 23, and the protruding shaft 25 a is connected to the governor spring 22. The auxiliary device 3 arranged in a state along the central axis is attached. A spring may be installed between the protruding shaft 25a of the actuator and the governor rod 24 (not shown).

Further, in the present embodiment, the auxiliary device 3 has the actuator 25 connected to the electronic control device 26. The electronic control device 26 is, for example, a magnet type for detecting the actual engine rotation speed. A rotation sensor 27, which is a device that can measure an engine rotation signal such as an engine crankshaft (not shown) or the like, and an accelerator opening for detecting a predetermined accelerator position signal. The target rotational speed is obtained from the set frequency of the degree detector 28 or the generator (not shown).

  In the present embodiment. The electronic control unit 26 stores in advance the target rotational speed obtained according to the predetermined accelerator opening obtained by the accelerator opening detector 28 and the like, and the measured rotational speed obtained from the detection signal from the rotation sensor 27. When the difference is found, the actuator 25 has an electronic control means for moving the governor arm 23, the throttle lever 12 or the governor rod 24 in the opening direction against the spring force of the governor spring 22.

  Therefore, according to the present embodiment, as shown in the graph of FIG. 2, in the case of a mechanical governor, there is a problem that the engine speed decreases when the load increases compared to when the load is small. For example, as the engine speed increases, the engine speed increases and the output increases accordingly. However, there is a problem that the output decreases rapidly when the engine speed exceeds a certain level. Since the output can be maintained at a predetermined target speed, the engine performance can be fully demonstrated, and there is a concern that the generator frequency that requires the target speed will cause any problems. There is no.

  In this embodiment, a linear solenoid is used as the actuator 25. However, other types of electronically controllable actuators such as a rotary solenoid, a step motor type, and a DC motor type can be used.

  3 and 4 show different embodiments of the present invention. The overall configuration is substantially the same as the embodiment shown in FIG. 1, but the embodiment shown in FIG. Unlike the case where the actuator 25 shown in FIG. 1 is connected to the cover arm 23, the actuator 25 is connected to the cover rod 24. In the embodiment shown in FIG. 4, the actuator 25 is connected to the throttle lever 12. The same operation and effect as the embodiment shown in FIG. 1 can be exhibited.

  In the embodiment of the present invention shown in FIGS. 1, 3 and 4, the actuator 25 is connected to the coverr arm 23, the coverr rod 24 or the throttle lever 12, respectively, but any one of the present invention may be used. It is also possible to provide a plurality of actuators by combining the above-described embodiments, and use them together or selected as appropriate according to the control amount, control speed, etc. (not shown).

  1 carburetor, 2 mechanical governor, 3 auxiliary device, 12 throttle lever, 13 accelerator lever, 22 governor spring, 23 governor arm, 24 governor rod, 25 actuator, 26 electronic controller, 27 rotation sensor, 28 accelerator opening detector

Claims (5)

  The actuator connected to the governor arm or throttle lever, the rotation sensor that detects the rotation of the engine, the measured rotation speed obtained from the detection signal from the rotation sensor, and the target rotation speed that has been obtained and stored in advance according to a predetermined accelerator opening are compared. An auxiliary device having an electronic control device that moves at least one of the governor arm, the throttle lever or the governor rod connecting the governor arm and the throttle lever in the opening direction against the spring force when the difference occurs. A mechanical governor comprising:   The mechanical governor according to claim 1, wherein the rotation sensor for detecting the actually measured rotation number is a primary current of a magnet ignition coil of an engine.   2. The mechanical governor according to claim 1, wherein the rotation sensor for detecting the actually measured rotation number is a rotation sensor installed on a crankshaft of an engine.   The mechanical governor according to claim 1, 2 or 3, wherein a rotational speed that is a basis of the target rotational speed is obtained from a set frequency of a generator.   The mechanical governor according to claim 1, 2, 3, or 4, wherein a rotational speed that is a basis of the target rotational speed is obtained from an accelerator position signal.