Clutch pedal positon sensor continuous calibration

Details Clutch pedal positon sensor continuous calibration Clutch pedal positon sensor continuous calibration

1991-06-03

1992-11-10

Williams, Hezron E.

Measuring and testing

Instrument proving or calibrating

Volume of flow, speed of flow, volume rate of flow, or mass...

36457105, G01D 1800, G06F 1520

Patent

active

051614057

ABSTRACT:
A non-volatile memory stores values defining a released position or a depressed position of a clutch pedal. A potentiometer mechanically linked to the clutch pedal produces an output signal whose value or magnitude represents the current position of the clutch pedal. When power is turned on, first and second end limit values which electrically define the depressed and released positions of the clutch pedal are read from the memory, a constant value is added to the first end limit value and subtracted from the second. Thereafter, each time the output signal is sensed for control purposes, the output signal is compared with the end limit values. If the output signal is less than the first end limit value it replaces that value in the memory and if the output signal is greater than the second end limit value it replaces that value. The sensor is thus calibrated in a manner transparent to the operator each time the system samples the sensor output signal for control purposes. When either end limit value is changed, threshold values representing specified positions of the clutch pedal relative to its released or depressed position are recalculated and stored for subsequent use as control values.

REFERENCES:
patent: 3763362 (1973-10-01), Griem, Jr.
patent: 4875674 (1989-10-01), Dreissigacker et al.
patent: 4951206 (1990-08-01), Kyohzuka
patent: 4989147 (1991-01-01), Ishii
patent: 5032998 (1991-07-01), Filleau
patent: 5086641 (1992-02-01), Roselli
Development of the Electronic Draft Control System for the Ford New Holland 8210 Tractor; Jim Macqueene; Paul Schwarz; Brad Nielsen; Sep. 10-13, 1990, SAE Technical Paper 901561.

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