Method and arrangement for adaptive switching off of the exhaust

Details Method and arrangement for adaptive switching off of the exhaust Method and arrangement for adaptive switching off of the exhaust

1994-12-29

1996-10-22

Teska, Kevin J.

Boots, shoes, and leggings

477107, 477109, 477 70, 477120, 192 4A, 192 358, 192 51, 74335, 74336R, G06G 770, B60K 4104

Patent

active

055683878

ABSTRACT:
The invention relates to an improved method and an arrangement for implementation of that method for obtaining safer and quicker upshifts while maintaining gear change comfort, using computer-assisted systems for gear change in mechanical gearboxes in motor vehicles, preferably without clutch disengagement between engine and gearbox. In connection with upshift, an exhaust brake is activated, (EB.sub.on) at time t.sub.1 in parallel with the fuel (FUEL) to the engine being reduced to zero quantity. The engine speed n.sub.2 is thereby reduced more quickly to the speed n.sub.1 which is the synchronous engine speed for the next higher gear. The speed reduction is monitored with a view to achieving rapid engine speed bracketing to synchronous speed, and also good gear change smoothness and safe gear engagement. The exhaust brake switch-off point EB.sub.off at time t.sub.2 is adjusted adaptively for subsequent upshift by a connection factor EBA.sub.off so that the engine speed falls to a level Maxdip within a predetermined speed range below the synchronous engine speed, preferably between 15 and 50 rpm below the synchronous speed.

REFERENCES:
patent: 4669435 (1987-06-01), Furusawa et al.
patent: 4787044 (1988-11-01), Nagata et al.
patent: 4961484 (1990-10-01), Kato et al.
patent: 4987869 (1991-01-01), Hilburger
patent: 5393276 (1995-02-01), White et al.

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