Marine shift speed equalizer

Details Marine shift speed equalizer Marine shift speed equalizer

1989-06-20

1991-01-22

Peters, Jr., Joseph F.

Marine propulsion

Engine, motor, or transmission control means

For engine speed

440 1, 123335, 74862, B63H 506

Patent

active

049867768

ABSTRACT:
A shift speed equalizer is provided in a marine transmission in a marine drive subject to a decrease in engine speed upon shifting from neutral to a forward or reverse gear due to a high propeller pitch or the like, such as in bass boat applications, and subject to an increase in engine speed upon shifting back to neutral. The shift from neutral to forward or reverse is sensed, and engine speed is increased in response thereto, to compensate the decrease in engine speed due to shifting. The return shift back to neutral is sensed, and engine speed is decreased in response thereto, to compensate the increase in engine speed due to shifting. Engine speed is increased by advancing engine spark ignition timing, and engine speed is decreased by retarding or returning engine ignition timing to its initial setting. Particular methodology and structure is disclosed, including modifications to an existing shift plate and to an existing guide block to enable the noted functions, and including the addition of an auxiliary circuit to existing ignition circuitry enabling the desired altering of engine ignition timing to keep engine speed from dropping when shifting into forward or reverse.

REFERENCES:
patent: 4111174 (1978-09-01), Fitzner et al.
patent: 4244336 (1981-01-01), Fitzner
patent: 4262627 (1981-04-01), Dretzka
patent: 4306535 (1981-12-01), Fitzner
patent: 4306536 (1981-12-01), Fitzner
patent: 4318387 (1982-03-01), Fitzner
patent: 4403970 (1983-09-01), Dretzka
patent: 4432734 (1984-02-01), Bland
patent: 4525149 (1985-06-01), Broughton
patent: 4712527 (1987-12-01), Staerzl
patent: 4726798 (1988-02-01), Davis
patent: 4753618 (1988-06-01), Entringer
patent: 4838822 (1989-01-01), Friedle
Mercury Marine Service Manual 90-97658, P. 7A-18, 1986.

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