2009 GMC Yukon Denali Hybrid Preview
SafetyThe 2009 GMC Yukon Denali Hybrid features a comprehensive safety package of crashworthiness and crash-avoidance features, including dual-stage front air bags with a passenger-sensing system; head curtain side air bags for all seating rows; front-seat safety belt pre-tensioners with rear-impact deployment capability; tire-pressure monitor; and a stability control system with traction control and rollover mitigation technology. Optional safety features include a rain-sensing wiper system; Ultrasonic rear parking assist; side blind-zone alert; and a rearview camera system that provides a view of objects/people in the vehicle's rearward path. The 2009 GMC Yukon Denali Hybrid also comes standard with the OnStar communications system with one year of Directions & Connections service with Turn-by-Turn Navigation. The OnStar plan includes GM's Advanced Crash Response System, which notifies emergency services in the event of an air bag deployment.
According to the National Highway Traffic Safety Administration (NHTSA), the 2009 GMC Yukon models receive perfect 5-star ratings in frontal and side-impact tests. In the agency's rollover testing, the Yukon receives a 3-star rating. As of this writing, the Insurance Institute for Highway Safety (IIHS) has not crash tested any models of the current-generation GMC Yukon family.
Technology
The 2009 GMC Yukon Denali Hybrid uses regenerative braking to capture energy that would otherwise be lost during vehicle deceleration. By using one or both of the EVT's traction motors as a generator, braking energy is converted to electrical energy and stored for future use to propel the vehicle. The regenerative brakes are used along with the standard hydraulic brakes to slow the vehicle and/or bring it to a stop. Depending on the amount of braking force required, the hydraulic brakes may not even be used, such as during mild deceleration. When additional braking is called for, based on a change in the position of and/or the force applied to the brake pedal, the hydraulic braking system will be called on to assist the generator(s) in slowing or stopping the vehicle. The anti-lock braking system/electronic stability control modulator used on the Yukon Denali Hybrid has been adapted to allow this interaction between the hydraulic brakes and the regenerative braking system.
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