JP2789402B2 - Automatic transmission control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is applied to an automobile having a cab tilt mechanism. The present invention relates to an automatic transmission control device for setting a transmission gear by computer control. The present invention relates to ensuring the safety of a cab tilt mechanism.

[0002]

2. Description of the Related Art An automatic transmission control device takes in an output signal of a speed sensor of a vehicle, a signal indicating a position of a shift lever operated by a driver, a state signal of a clutch, and a rotation speed signal of an engine. Computer control means for calculating and setting the optimal transmission gear is provided.

On the other hand, an automobile having a cab tilt mechanism is provided with locking means for mechanically fixing the cab to a steady position so that the cab does not inadvertently tilt.
A circuit for sending an alarm signal to the driver's seat when the locked state of the lock means is released is provided.

When the cab is tilted for maintenance, the vehicle must not move.
As a driving operation, it is necessary to securely apply the parking brake before tilting the cab, but as a safety device to prevent the vehicle from moving accidentally,
A device that prevents the cab from tilting unless the transmission gear is in neutral (see Japanese Utility Model Application Laid-Open No. 58-146762), and a device that prevents operation when the cab lock means is unlocked (actually, Kaisho 56-
No. 49678) is known.

[0005]

SUMMARY OF THE INVENTION These prior arts are:
Both are safety devices such as confirming that the transmission gear is not in a position where the vehicle can travel so that the vehicle does not move with the cab tilted. In recent years, automatic transmission control by computer control has been performed. Became popular. In order to perform maintenance and inspection by tilting the cab, it may be necessary to keep the engine running.It is not possible to prohibit rotation of the engine in the tilted state. It is not appropriate that the computer control system is automatically turned off when performing the operation.

[0006] Even if it is confirmed that the transmission gear is in the neutral position at the stage of tilting the cab, an unexpected arithmetic control is performed by the computer control device for some reason, and the transmission gear is moved to a position where the transmission gear can travel. It is not always possible that they will be thrown. Rather, as a safety measure, it is assured that the transmission gear does not move from the neutral position even if the computer controller is arithmetically controlled for unexpected reasons.

The present invention has been made in view of such a background, and an object of the present invention is to provide a safety control device provided with a computer-controlled shift control device for ensuring safety of a cab-tilt vehicle. And

[0008]

SUMMARY OF THE INVENTION The present invention calculates an optimal transmission gear by taking an output signal of a speed sensor of a vehicle, a signal indicating a position of a transmission lever operated by a driver, and a state signal of a clutch. In an automatic transmission control device including a setting means, an electric terminal is provided, and when a ground potential is applied to this electric terminal, the transmission gear is set and fixed at a neutral position regardless of the respective signals. And a relay circuit for continuously applying a ground potential to the electric terminal when the cab lock mechanism of the cab tilt mechanism of the vehicle is released.

[0009] Instead of the ground potential, a DC potential in a specific range can be set.

[0010]

When a specific electric terminal is provided in the computer control device, and this electric terminal has a ground potential (or a potential in a specific range, for example, a potential representing "1" or "0" of a digital circuit), Regardless of the state of the input signal, the computer control device executes the interrupt control with the highest priority and sets and controls the transmission gear to the neutral position. As a result, the computer control device is arithmetically controlled due to inadvertent operation of the operation button, such as the operation button being pressed due to a wire harness wire short circuit, short circuit, or falling off of an article, failure of a circuit component, or other unforeseen circumstances. In this case, the interrupt control which takes precedence is executed and the transmission gear is fixed at the neutral position.

[0011]

Next, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a block diagram showing a configuration of the present invention, and FIG. 2 is a diagram showing a tilted state of a cab according to an embodiment of the present invention.

An embodiment of the present invention is a calculating means for calculating and setting an optimal transmission gear by taking an output signal of a speed sensor of a vehicle, a signal indicating a position of a transmission lever operated by a driver, and a state signal of a clutch. 11 and a terminal board 1 as a feature of the present invention.
2 is provided with one electric terminal 12a, and an interruption control means for setting and fixing the transmission gear to a neutral position regardless of the above-mentioned signals when the electric terminal 12a is supplied with a ground potential. 11a, and a relay circuit 2 for continuously applying a ground potential to the electric terminal 12a when the cab lock means of the cab tilt mechanism of the vehicle is released. Instead of the ground potential, a DC potential in a specific range may be used.

Next, the operation of the embodiment of the present invention thus configured will be described.

Normally, in the process in which the cab is released and the cab is tilted to the maximum tilt position or returned from the maximum tilt position to the steady position,
The cab lock switch 7 and the tilt limit switch 6 are on.

When the cab 15 is released to tilt the cab 15, the hydraulic circuit 20 shown in FIG. 2 is switched to the hydraulic pressure increasing operation, and the operation switch 3 is operated to set the power relay 4 on. In this state, the tilt motor 5 operates, the hydraulic pump 21 and the hydraulic cylinder 23 operate, and the cab 15 starts the tilt operation. When the cab is tilted to the maximum tilt position, the tilt limit switch 6 is turned off, and accordingly, the power relay 4 is set to the off state and the tilt operation is stopped.

In the course of such a tilt operation, since the cab lock switch 7 is always set to the ON state, the relay circuit 2 is also set to the ON state, and the relay circuit 2 is provided on the terminal plate 12 of the computer controller 1. A ground potential is applied to the electric terminal 12a.

When a ground potential is applied to the terminal plate 12, the interrupt control means 11a outputs a speed sensor output signal a from the speed sensor, a shift lever position display signal b operated by the driver, and a clutch state indicating the state of the clutch. Regardless of the signal c, the transmission gear of the transmission 8 is preferentially set to the neutral position and fixed.

When the cab reaches the maximum tilt position, the tilt limit switch 6 is turned off and the power relay 4
Is turned off, and the operation of the tilt motor 5 is stopped.

In order to return the cab from the maximum tilt position to the steady position after the predetermined operation is completed, the hydraulic circuit 20 is switched to a hydraulic pressure lowering operation, and the cab 15 is moved to the maximum tilt position by mechanical operation of the hydraulic cylinder 23 shown in FIG. When the operation switch 3 is turned on by operating the operation switch 3 while the tilt limit switch 6 is kept on until the vehicle descends from the position, the power relay 4 is turned on, the tilt motor 5 is driven, and the hydraulic pump 21 and The hydraulic cylinder 23 operates and the cab is returned to the normal position. Since the ground potential is continuously applied to the electric terminals 12a provided on the terminal plate 12 of the computer control device 1 in the process until returning to the steady position, the gear of the transmission 8 is fixed at the neutral position. Maintain state.

When the operator turns off the operation switch 3 when the cab reaches the steady position, the power relay 4 is turned off and the operation of the tilt motor 5 stops. Here, when the cab is locked for fixing the cab, the cab lock switch 7 is turned off, and the relay circuit 2 is turned off. When the relay circuit 2 is turned off, the ground potential applied to the electric terminals 12a of the terminal plate 12 disappears, the interrupt control means 11a becomes invalid, and the neutral position of the transmission gear can be released.

Thus, during the cab tilt operation,
Whatever control signal is input, the neutral position of the transmission gear is fixed with the highest priority, and a safe state is maintained.

[0022]

As described above, according to the present invention, during the cab tilt operation, the harness wires may be mixed or short-circuited.
Even if the computer control device is arithmetically controlled due to inadvertent operation of operation buttons, circuit failure, or other unexpected circumstances, interrupt control for fixing the neutral position of the transmission gear that takes precedence can be executed, and safety can be achieved. There is an effect that can be secured.

[Brief description of the drawings]

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

FIG. 2 is a view showing a cab tilted state according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Computer controller 2 Relay circuit 3 Operation switch 4 Power relay 5 Tilt motor 6 Tilt limit switch 7 Cab lock switch 8 Transmission 11 Computing means 11a Interrupt control means 12 Terminal plate 12a Electric terminal 15 Cab 20 Hydraulic circuit 21 Hydraulic pump 22 Oil Reservoir 23 hydraulic cylinder

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B62D 33/07 B60R 16/02 660

Claims (2)

(57) [Claims] 1. Automatic shift control including means for taking in an output signal of a speed sensor of a vehicle, a signal indicating a position of a shift lever operated by a driver, and a state signal of a clutch to calculate and set an optimal shift gear. An interrupt control means for setting and fixing a transmission gear to a neutral position regardless of each of the signals when a ground potential is applied to the electric terminal; An automatic transmission control device, comprising: a relay circuit for continuously applying a ground potential to the electric terminal when the cab lock means of the mechanism is released. 2. The automatic transmission control device according to claim 1, wherein a DC potential in a specific range is used instead of the ground potential.