Communications: electrical – Land vehicle alarms or indicators – Internal alarm or indicator responsive to a condition of the...
Reexamination Certificate
1999-12-15
2001-01-09
Wu, Daniel J. (Department: 2736)
Communications: electrical
Land vehicle alarms or indicators
Internal alarm or indicator responsive to a condition of the...
C340S461000
Reexamination Certificate
active
06172603
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an automatic transmission of a vehicle, and more particularly to a shift stage display device for an automatic transmission of a vehicle adapted to allow a driver to distinguish shift stages of the automatic transmission while running.
2. Description of the Prior Art
Generally, an automatic transmission of a vehicle is mounted with a transmission control unit (hereinafter referred to as TCU) for automatically adjusting a transmission ratio according to running speed and load of the vehicle.
The TCU controls a plurality of clutches mounted at a gear train and a brake in an actuation or non-actuation state to thereby adjust revolution at an output terminal of a planetary gear device.
In adjusting the revolutions at the output terminal, the TCU receives output signals of various sensors variably output according to running states of a vehicle to output to a solenoid valve for adjusting hydraulic pressure of a plurality of clutches provided at a gear train and the brake; said a transmission ratio duty control signal for shifting an automatic transmission without shifting shock according to given program execution steps, such that the solenoid valve is duty controlled and controllably turned on and off.
When a driver manipulates a shift lever after applying power to vehicles for running the vehicle with an automatic transmission, a current position of the shift lever is displayed on a cluster panel mounted in front of the driver by way of communications according to the prior art, such that the driver can locate where the shift lever is situated.
However, there is a problem in the prior art in that the current position of the change lever is only displayed according to changes of the change lever, per se; by the driver, while shifting change states of an automatic transmission cannot be determined in a running car. There is another problem in that a rapid countermeasure cannot be taken when there occurs a shift stage hold state caused by malfunction of a vehicle while the vehicle is shifted.
There present invention is provided to solve the aforementioned problems, and it is an object of the present invention to provide a shift stage display device for an automatic transmission of vehicle adapted to allow a driver to easily recognize a shifting progressive state while the vehicle is running.
SUMMARY OF THE INVENTION
In accordance with the object of the present invention, there is provided a shift stage display device for an automatic transmission of vehicle, the device comprising:
power supply means for supplying stable power to a circuit while the vehicle is running;
control means for determining a shift stage according to a running state of the vehicle to output a predetermined shift control signal;
an interface circuit for controllably turning on and off a solenoid valve according to the control signal output from the control means to thereby output a predetermined signal corresponding to a shift stage of the running vehicle according to prior established program; and
shift stage display means for displaying each position of the shifting stage of the running vehicle according to the predetermined signal output from the interface circuit.
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patent: 5861803 (1999-01-01), Issa
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Hyundai Motor Co.
Tang Son
Wu Daniel J.
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