JPH0948253A - Vehicle with automatic transmission - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle with an automatic transmission having a power take-off preventing the increase of engine rotation speed even in the case of operating an external engine control lever during the stop of the vehicle with a shift position being in neither a parking range nor a neutral range but in a travelable range. SOLUTION: A vehicle with an automatic transmission has an external engine control lever 4, link mechanism 5 for mechanically connecting a speed lever 7 and the external engine control lever 4 to each other, a stopper 9 for limiting the operation of the link mechanism 5, and a control means for releasing the operation limit of the link mechanism 5 performed by the stopper 9 in the case of a transmission being positioned in either one of a neutral range and a parking range.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic transmission vehicle having a power take-off function and capable of controlling the engine speed from outside the driver's seat.

[0002]

2. Description of the Related Art In a vehicle equipped with a conventional automatic transmission, such as a vehicle with a cab back crane, which has a power take-off function and can increase the engine speed from outside the driver's seat, If the shift is stopped in a driving range that is neither the parking range nor the neutral range and the external engine control lever is operated, the vehicle may start, which is dangerous.

As a known technique, Japanese Utility Model Laid-Open No. 2-5328 discloses a control circuit which sounds an alarm when a parking switch is turned off and an inhibitor switch is turned on.

[0004]

SUMMARY OF THE INVENTION The present invention is directed to an automatic transmission vehicle with a power take-off in which the engine speed does not rise even if an external engine control lever is operated while the shift position is stopped in a travelable range that is neither parking nor neutral. Is intended to provide.

[0005]

According to the present invention, in an automatic transmission vehicle having a power take-off function and capable of controlling the engine speed from the outside of the driver's seat, the engine from the outside of the driver's seat is actuated when the power take-off is activated. An external engine control lever for controlling the rotational speed, a link mechanism for mechanically connecting the external engine control lever with a speed lever for controlling the engine rotational speed by increasing or decreasing the fuel injection amount from the engine injection pump, and the link It has a stopper for limiting the operation of the mechanism, and a control means for releasing the limitation of the operation of the link mechanism by the stopper when the transmission is located in one of the neutral range and the parking range.

The control means is provided in the automatic transmission, and an inhibitor switch that energizes the starter relay only when the automatic transmission is positioned in either the neutral range or the parking range, the electromagnetic lock cylinder, and the starter. A circuit for electrically connecting a vehicle battery and an electromagnetic lock cylinder via a relay, wherein the electromagnetic lock cylinder has a piston that abuts against the link mechanism and restricts its operation as a stopper during extension. However, the piston is always in the expanded state, but is contracted only when the circuit is energized.

[0007]

According to the present invention, when the automatic transmission is in the travelable range which is neither the neutral range nor the parking range, the operation of the link mechanism is restricted by the stopper by the control means, and the external engine control lever is operated. The speed lever of the engine injection pump cannot be operated in the engine rotation increasing direction. On the other hand, when the engine is located in the neutral range or the parking range, the operation restriction by the stopper is released by the control means and the engine speed can be controlled by operating the external engine control lever.

The operation of the control means is that the inhibitor switch energizes the starter relay when it is located in either the neutral range or the parking range, and the starter relay energizes the electromagnetic lock cylinder from the battery to contract the stopper. On the other hand, when it is neither the neutral range nor the parking range, the inhibitor switch does not energize the starter relay, and the electromagnetic lock cylinder operates in the extended state to operate the stopper.

[0009]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, an external engine control lever 4 is provided which can control the engine speed from outside the driver's seat during power take-off operation. The external engine control lever 4 is mechanically connected via a link mechanism 5 to a speed lever 7 provided on an engine injection pump 6 for controlling the engine speed. A stopper 9 that limits the operation of the link mechanism 5 in the direction in which the engine speed increases, that is, in the counterclockwise rotation of the link mechanism 5 in the figure, is in contact with the link mechanism 5.

The control means for controlling the stopper 9 is connected to a select lever 1 of the automatic transmission provided in the driver's seat by a control cable C and is attached to an inhibitor switch 2 mounted on an automatic transmission main body (not shown). And an electromagnetic lock cylinder 8 in which a piston forms the stopper 9 at its tip and expands and contracts it, and a starter relay 3 for energizing the electromagnetic lock cylinder 8 from the vehicle battery B by a signal from the inhibitor switch 2. And a circuit connecting them, and the stopper 9 is set in an always extended state in which the stopper 9 contracts only when the circuit is energized. The inhibitor switch 2 is set so as to be energized only when the transmission is in either the parking range or the neutral range.

The operation will be described with reference to the flow chart of FIG.

In step S1, when the shift position of the automatic transmission is checked and is in the neutral range or the parking range, the battery B is energized to the starter relay via the inhibitor switch 2 (step S2), and the contacts of the starter relay 3 are contacted. When is closed (step S3), the electromagnetic lock cylinder 8 is energized from the battery B (step S4). Then, the piston of the electromagnetic lock cylinder 8 contracts, the stopper 9 retracts (step S5), and the operation restriction of the link mechanism 5 is released. Therefore, if the external engine control lever 4 is operated, the speed lever 7 can be operated via the link mechanism 5, and the engine speed can be controlled.

On the other hand, if the automatic transmission is in a driveable range that is neither the neutral range nor the parking range,
In FIG. 2, the step S1 is circulated, and therefore, the action of the inhibitor switch 2 does not energize the starter relay 3 from the battery B to the electromagnetic lock cylinder 8, the piston is maintained in the extended state, and the stopper 9 is linked. And its operation is limited. Even if the external engine control lever 4 is operated in this state, the operation of the link mechanism 5 is restricted by the stopper 9 and the speed lever 7 cannot be operated in the engine rotational speed increasing direction, and the vehicle may start. To be prevented.

[0015]

As described above, according to the present invention, in a vehicle equipped with an automatic transmission having a power take-off function, the automatic transmission stops at a position other than the neutral range or the parking range, and the external engine control lever is supplied from outside the vehicle. It is possible to solve the dangerous problem that the vehicle starts by operating the to increase the engine rotation.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a configuration of an embodiment of the present invention.

FIG. 2 is a flow chart for explaining the operation of the control means of the present invention.

[Explanation of symbols]

 1 ... Select lever 2 ... Inhibitor switch 3 ... Starter relay 4 ... External engine control lever 5 ... Link mechanism 6 ... Injection pump 7 ... Speed lever 8 ... Electromagnetic type Lock cylinder 9 ... Stopper B ... Battery C ... Control cable

Claims (2)

[Claims] 1. An automatic transmission vehicle having a power take-off function and capable of controlling the engine speed from outside the driver's seat, and an external engine control lever for controlling the engine speed from outside the driver's seat during power take-off operation. A link mechanism that mechanically connects the speed lever that controls the engine speed by increasing or decreasing the fuel injection amount from the engine injection pump and the external engine control lever,
A stopper for restricting the operation of the link mechanism, and a control means for releasing the restriction of the operation of the link mechanism by the stopper when the transmission is located in one of the neutral range and the parking range. An automatic transmission vehicle characterized in that 2. The control means is provided in an automatic transmission, and an inhibitor switch that energizes a starter relay only when it is located in one of a neutral range and a parking range, an electromagnetic lock cylinder, and a starter. A circuit for electrically connecting a vehicle battery and an electromagnetic lock cylinder via a relay, wherein the electromagnetic lock cylinder has a piston that abuts against the link mechanism and restricts its operation as a stopper during extension. Wherein the piston is always in a stretched state, but contracts only when the circuit is energized.
The automatic transmission vehicle described.