On-grade shift logic with provision for skip downshifts

Details On-grade shift logic with provision for skip downshifts On-grade shift logic with provision for skip downshifts

1988-04-18

1990-04-17

Diehl, Dwight G.

Machine element or mechanism

Rotary member or shaft indexing, e.g., tool or work turret

Preselected indexed position

3644241, G60K 4106

Patent

active

049169793

ABSTRACT:
An improved control system and method for an automatic/semi-automatic transmission system (10) including an automatic change gear transmission (12) driven by a throttle (26) controlled engine (14) is provided. The control system includes a processing unit (42) for receiving inputs indicating at least throttle position (THL) and vehicle speed (OS) and for determining vehicle deceleration (dOS/dt) and for processing these inputs in accordance with a program or logic rules to determine the selected engaged gear ratio and for issuing command signals to a transmission shifting mechanism (34). The processing unit includes logic rules by which vehicle performance is maximized and the control will evaluate and allow and/or execute skip downshifts upon sensing conditions indicative of vehicle deceleration due to ascending a steep grade.

REFERENCES:
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patent: 4285252 (1981-08-01), Yamaki et al.
patent: 4338666 (1982-07-01), Suzuki et al.
patent: 4361060 (1982-11-01), Smyth
patent: 4576065 (1986-03-01), Speranza et al.
patent: 4595986 (1986-06-01), Daubenspeck et al.
patent: 4648290 (1987-03-01), Dunkley et al.
patent: 4733580 (1988-03-01), Kubo et al.
patent: 4742733 (1988-05-01), Schreiner

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