System for controlling engine speed when direction of vehicle changed
First Claim
1. A system for controlling engine speed when the direction of movement of a vehicle is changed, comprising:
- an internal combustion engine;
step-less transmission means for connecting the engine with the vehicle and for continuously controlling a transmission ratio from a value lower than zero to a value higher than zero for providing a desired speed of the vehicle in a desired direction of movement of the vehicle;
actuator means for providing a transmission ratio control signal directed to said step-less transmission means, the value of the transmission ratio control signal being controlled to attain said continuous control of the transmission ratio in accordance with an engine load as required, the polarity of the transmission control signal controlling the direction of movement of the vehicle as required;
transmission ratio control means for controlling, when the direction is to be changed between forward and reverse directions, a transient state of a value of the transmission ratio control signal from a value of the transmission control signal at a preceding steady state to a value of the transmission ratio control signal at a following steady state;
judging means for judging a change of driving direction and deceleration condition of the vehicle to issue an engine speed control signal andengine revolution reducing means for adjusting an engine revolution speed to a lower engine revolution speed by said engine speed control signal from said judging means.
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Accused Products
Abstract
A system for controlling engine speed for a vehicle such as a fork-lift. The system has an accelerator pedal for controlling an engine speed, and a control lever for controlling the direction of movement of the vehicle, or the system is provided with a seesaw type accelerator pedal for controlling the engine speed and the direction of movement of the vehicle.
An EXNOR gate is provided for detecting deceleration of the engine while the accelerator pedal is depressed. When deceleration is detected, the throttle valve is returned to an engine idling position or the supply of fuel is cut. Thus, an effective engine braking can be obtained when the direction of movement of the vehicle is changed while the accelerator pedal is depressed.
A window comparator is provided for detecting the area near the end of deceleration, so that the engine speed is increased prior to the commencement of acceleration.
26 Citations
35 Claims
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1. A system for controlling engine speed when the direction of movement of a vehicle is changed, comprising:
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an internal combustion engine; step-less transmission means for connecting the engine with the vehicle and for continuously controlling a transmission ratio from a value lower than zero to a value higher than zero for providing a desired speed of the vehicle in a desired direction of movement of the vehicle; actuator means for providing a transmission ratio control signal directed to said step-less transmission means, the value of the transmission ratio control signal being controlled to attain said continuous control of the transmission ratio in accordance with an engine load as required, the polarity of the transmission control signal controlling the direction of movement of the vehicle as required; transmission ratio control means for controlling, when the direction is to be changed between forward and reverse directions, a transient state of a value of the transmission ratio control signal from a value of the transmission control signal at a preceding steady state to a value of the transmission ratio control signal at a following steady state; judging means for judging a change of driving direction and deceleration condition of the vehicle to issue an engine speed control signal and engine revolution reducing means for adjusting an engine revolution speed to a lower engine revolution speed by said engine speed control signal from said judging means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A system for driving a vehicle, comprising:
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an internal combustion engine; step-less transmission means for connecting the engine with the vehicle; first actuator means for controlling an engine operating parameter related to the engine speed; second actuator means for controlling said step-less transmission means in such a manner that the transmission ratio is continuously changed between a value lower than zero and a value higher than zero; manipulator means for producing a requirement of vehicle speed in a desired direction of movement of the vehicle; first control means, responsive to movement of the manipulator means, for producing a first signal indicating the engine speed requirement, said first signal being introduced to said first actuator means; second control means, responsive to movement of the manipulator means, for producing a second signal indicating the transmission ratio requirement, said second signal being introduced to said second actuator means; first detecting means for detecting a switching operation of the manipulator means for changing the direction of movement of the vehicle; lamp means for controlling a level of said second signal upon the detection of said switching operation by said first detecting means so that the level is gradually changed in accordance with a lapse of time from commencement of the switching operation; second detecting means for detecting a change of the second signal caused by deceleration; and engine idling control means for, when deceleration is detected, controlling the engine so that engine braking is attained. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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Specification