Importance

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Abstract

A system for controlling vehicle braking operation includes a mechanism for determining desired service brake force, a mechanism for determining vehicle deceleration, an electronically actuatable engine compression brake unit, an electronically controllable turbocharger boost pressure adjustment device and a transmission including a number of automatically selectable gear ratios, wherein each of these components are coupled to a control computer. The control computer is operable to activate the engine compression brakes whenever service brake action is detected, and to modulate the downshift engine speed points of the transmission as a function of the desired brake force. The boost pressure adjustment device and the engine compression brake may optionally be controlled to maintain a vehicle deceleration rate below a deceleration rate threshold. Alternatively, the downshift engine speed points may be controlled to maintain the vehicle deceleration rate below the deceleration rate threshold.

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First Claim