Patent ID: 7077784
Filing Date: 2006-07-18
Classification: B60W,F02D,Y10T

Abstract:
1. System for controlling deceleration of an engine crankshaft in an internal combustion engine, comprising: an engine speed sensor producing an engine speed signal indicative of rotational speed of the engine; a vehicle speed sensor producing a vehicle speed signal indicative of road speed of a vehicle carrying the engine; an engine retarding device configured to produce a retarding torque for decreasing rotational speed of the engine crankshaft; and a control computer configured to process the engine speed signal and the vehicle speed signal to determine an effective gear ratio of a transmission coupled to the engine and to determine that the engine is operating with low inertia if the effective gear ratio is greater than a threshold gear ratio value, the control computer further configured to control deceleration of the engine crankshaft when the engine retarding device is operational by limiting the retarding torque produced by the engine retarding device if the engine is operating with low inertia.