Mode control for mechanical transmission system with semi-automa

Details Mode control for mechanical transmission system with semi-automa Mode control for mechanical transmission system with semi-automa

1990-08-17

1991-09-17

Cangialosi, Salvatore

Boots, shoes, and leggings

74866, B60K 4108, B60K 4118

Patent

active

050500791

ABSTRACT:
A mode control method/system for a control system (104) for semi-automatically executing automatically and manually selected upshifts and downshifts of a mechanical transmission system (10) is provided. The control system includes a central processing unit (106) for receiving input signals indicative of transmission input shaft (16) and output shaft (90) speeds and from a driver control console (108) indicative of manual selection of upshifts or downshifts from a currently engaged gear ratio, or manual selection of operation in an automatic preselect mode, and processing the same in accordance with predetermined logic rule to issue command output signals to a transmission actuator (112, 70, 96) to implement the selected shifts by automatic shifting into neutral upon a naturally or manually caused torque reversal of the transmission and remaining in neutral until the vehicle operator causes substantially synchronous conditions to occur. The method (200) includes sensing if output shaft speed remains substantially constant and the transmission is not shifted (Shift=F) for a predetermined time (REF) and then causing the system to operate in the manually selected shift mode of operation.

REFERENCES:
patent: 4425620 (1984-01-01), Batcheller et al.
patent: 4551802 (1985-11-01), Smyth
patent: 4631679 (1986-12-01), Klatt
patent: 4648290 (1987-03-01), Dunkley et al.
patent: 4947331 (1990-08-01), Sperawza
patent: 4991099 (1991-02-01), Markyuech et al.

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