Weighing scales – Weigher responsive material control – Discharge valve or gate
Patent
1993-01-22
1995-02-14
Wright, Dirk
Weighing scales
Weigher responsive material control
Discharge valve or gate
3644241, 477107, B60K 4100
Patent
active
053890515
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method of and apparatus for controlling the speed of an automotive engine, and more particularly, to a method of and apparatus for controlling the speed of an internal combustion engine mounted on an industrial vehicle such as a forklift truck or a carrier vehicle, to an appropriate speed level according to the running conditions of the industrial vehicle.
BACKGROUND ART
Generally, for industrial vehicles running under specific running conditions, such as operating on specific terrain (yard) or operating at night, maintenance of an appropriate running speed is usually required. Accordingly, it has been a common practice to equip the industrial vehicle with a running speed control apparatus for controlling the running speed of the industrial vehicle according to the running conditions or with an engine speed control apparatus for controlling the engine speed of the internal combustion engine and thereby limiting the maximum running speed of the industrial vehicle. A prior art running speed control apparatus is provided with an alarm means that generates an alarm signal to warn the driver upon detection of a running speed exceeding a predetermined maximum running speed. A prior art engine speed control apparatus is provided with a speed reducing means that automatically reduces the engine speed to idling speed upon detection of a running speed exceeding a predetermined maximum running speed.
FIG. 22 is a diagrammatic illustration of an example of the above-mentioned prior art, i.e., an apparatus for controlling the running speed of an industrial vehicle through the control of the speed of the internal combustion engine of an the industrial vehicle.
Referring to FIG. 22, when the accelerator pedal 2 of a vehicle mounted with an engine 1 is depressed, a throttle lever 4 connected to the accelerator pedal 2 by a throttle cable 3 opens the throttle valve 5 of a carburetor 6, potentially to its fully open position, and when the displacement of the accelerator pedal is reduced, the opening of the throttle valve 5 is reduced accordingly. Thus, the speed of the engine is controlled by operating the accelerator pedal 2.
An actuator 7, such as an electromagnetic clutch having a pair of clutch plates, is provided on a transmission line for transmitting the movement of the accelerator pedal to the throttle lever 4. Normally, the actuator 7 is in an off-state (for the electromagnetic clutch, a state such that the pair of clutch plates are engaged) and the throttle valve 5 is operated according to the displacement of the accelerator pedal 2. A running speed sensor 8 provides a running speed signal representing the running speed of the vehicle to an ECU (electronic control unit) 10 comprising a microcomputer. Upon detection of a running speed exceeding an upper limit running speed from the running speed signal provided by the running speed sensor 8, the ECU 10 turns on the actuator 7 (for the electromagnetic clutch, a state such that the pair of clutch plates are disengaged). With the actuator 7 turned on, the depression displacement of the accelerator pedal 2 is not transmitted to the throttle cable 3, so that the throttle valve 5 returns to its fully closed position and the engine 1 operates at idling speed.
When the accelerator pedal 2 is released, the accelerator pedal 2 closes an idling switch 9, and upon receipt of a signal through the idling switch 9, the ECU 10 generates a signal to turn off the actuator 7. Consequently, control of the throttle valve 5 using the accelerator pedal 2 is resumed.
Although the prior art running speed control system provided with the alarm means generates an alarm signal, the running speed of the vehicle cannot be actually controlled unless a driver carries out a necessary decelerating operation including releasing the accelerator pedal and applying the brake.
When the engine is controlled by the prior art engine speed control apparatus capable of automatically reducing the engine speed to idling speed, a driver will experience unpl
REFERENCES:
patent: 4397379 (1983-08-01), Baudoin
patent: 4484497 (1984-11-01), Hibino
patent: 4924832 (1990-05-01), Abe
patent: 4931939 (1990-06-01), Kawata et al.
patent: 5161503 (1992-11-01), Yano et al.
patent: 5249484 (1993-10-01), Matsuoka et al.
International Search Report dated Jul. 28, 1992 issued by the Japanese Patent Office in connection with the subject International Application.
Hirate Hiroshi
Iwai Tomohiro
Ohtoshi Kohta
Kabushiki Kaisha Toyoda Jidoshokki Seisakusho
Wright Dirk
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