Servo control system for transmission shaft speed control

Details Servo control system for transmission shaft speed control Servo control system for transmission shaft speed control

1986-03-31

1988-02-23

Smith, Jerry

Boots, shoes, and leggings

74861, 74866, 364161, F16H 300, B60K 2000

Patent

active

047274727

ABSTRACT:
A vehicle electronic transmission control system (10) having a servo control loop is disclosed. During the selection of a new gear, a countershaft (27) and transmission input drive shaft (13) are declutched from an engine crankshaft (11) and decoupled from a transmission output shaft (15). An error signal e is calculated representative of the difference between a desired speed related to input shaft speed (w.sub.1) and actual output shaft speed (w.sub.2). The error signal e is utilized to provide a servo control signal C having a first proportional term related to the square of the error signal, but having the polarity of the error signal, a second term related to the integral of the error signal multiplied by the absolute magnitude of the error signal and a third term related to the derivative of the error signal. The signal C determines a pulse width modulation drive signal for either a speed-up slip clutch mechanism (61) or a brake slip clutch mechanism (71) which together control the speed of the countershaft (27) to bring this shaft into proper synchronous relationship with respect to the transmission output shaft (15). When this synchronous relationship is achieved, by virtue of the error signal e being approximately zero, a blocking solenoid (22) is released to permit manual selection of the newly desired gear relationship between the input and output transmission shafts. Subsequently, a master clutch (14) is released which couples the engine crankshaft to the vehicle axle shaft via the present transmission system. By utilizing the absolute magnitude of the error signal as a multiplier M for the proportional and integral terms of the control signal C, a rapid transient response is obtained for synchronizing the input and output transmission shafts and overshoot is minimized.

REFERENCES:
patent: 4495837 (1985-01-01), Morschezk
patent: 4495839 (1985-01-01), Morschezk
patent: 4498036 (1985-02-01), Salemka
patent: 4543637 (1985-09-01), Smith et al.
patent: 4555959 (1985-12-01), Braun

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