The Car and Truck Fleet and Leasing Management Magazine

GM to Equip 2004-MY 15-Passenger Vans with Vehicle Stability Enhancement System

May 13, 2003

General Motors announced it will begin installing vehicle stability enhancement systems (VSES) in GMC Savana and Chevrolet Express 15-passenger vans during the 2004-model year production cycle.The system will be standard on all 15-passenger vans. It will be incorporated as an interim change during the 2004 production year, which begins later this summer.VSESs help drivers maintain control of vehicles during certain difficult driving conditions such as ice, snow, gravel, wet pavement, and uneven road surfaces, as well as in emergency lane changes or avoidance maneuvers.GM offers the system across its product line with the names StabiliTrak, Precision Control, and Active Traction. The 15-passenger vans will be badged StabiliTrak.VSES works by recognizing wheel skid. Sensors detect the difference between the steering wheel angle and the direction the driver is actually turning by "reading" the steering wheel position, the amount of sideways force in play, vehicle speed, and the vehicle's response to steering wheel input.The system then uses the brakes to enhance control of the vehicle's direction and to help keep it on course. It automatically reduces the engine torque and applies precise amounts of pressure to front right or left brakes to help keep the vehicle on track. These brake and engine interventions help realign the vehicle's actual path with that being steered by the driver.
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