Electronically controlled automatic transmission

Details Electronically controlled automatic transmission Electronically controlled automatic transmission

1987-08-10

1989-06-20

LaRoche, Eugene R.

Boots, shoes, and leggings

74866, G06F 1550, G06F 770

Patent

active

048414450

ABSTRACT:
In accordance with the invention, the mounting position of a throttle opening sensor is adjusted in such a manner that the output voltage of the sensor attains a value a value of V.sub.100 at a throttle opening of 100%. When execution of the system program starts, V.sub.0 is stored in memory as initialized voltage data at a throttle opening of 0%. A throttle opening .theta..alpha. corresponding to sensed voltage data V.alpha. is calculated in an arithmetic unit in accordance with the following equation: ##EQU1## The throttle opening - output voltage characteristic may change due to an error in mounting the throttle opening sensor, a change in the length of the throttle cable caused by a temperature variation, or a change in resistance value caused by aging. If such is the case and a voltage V'.sub.0 greater than the previously stored voltage V.sub.O prevailing at the throttle opening of 0% is sensed, then V'.sub.0 is stored in memory as new voltage data corresponding to the throttle opening of 0%. Thereafter, a throttle opening .theta.'.alpha. corresponding to sensed voltage data V'.alpha. is calculated in accordance with Eq. (1). Therefore, since an adjustment is made so as to absorb any variance in the throttle opening - output voltage characteristic of the throttle opening sensor, an accurate throttle signal can be obtained at all times despite a change in the characteristic of the throttle opening sensor when the sensor is mounted or due aging.

REFERENCES:
patent: 3943799 (1976-03-01), Sakai et al.
patent: 4335428 (1982-06-01), Miki
patent: 4551802 (1985-11-01), Smyth
patent: 4637278 (1987-01-01), Nishikawa et al.

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