How does it work? GM replaces the conventional electric starter and alternator with a compact electric motor, itself integrated between the engine and transmission in a patented, space-efficient manner. The added torque provided by the electric motor will be appreciated by those that pull heavy loads, as it
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| In the hybrid truck, GM replaces the conventional electric starter and alternator with a compact electric motor. (Photo: General Motors of Canada) |
Those used to the regular rumble of a big V8 at idle, or an even louder diesel, will find the hybrid a bit of a shock when the engine stops running when the truck is stationary. Releasing the brake pedal will immediately spark the V8 engine to life and full power is restored.
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| GM hybrid pickups take advantage of regenerative braking, which uses the kinetic energy developed by braking to recharge the batteries. (General Motors of Canada) |
Unlike Toyota's full-hybrid technology, also adapted by Ford and soon Nissan, the Silverado and Sierra trucks make use of a less sophisticated partial-hybrid system - much the same as used by Honda. The jury is out as to which is better over the long haul, but partial systems are not considered quite as efficient as full-hybrid systems, as the gasoline engine needs to be running while under way - unless coasting. Full-hybrid systems can drive on electric power alone, until the batteries need recharging at which time the gasoline engine restarts.
The new GM hybrid pickups do take advantage of regenerative braking, however, which uses the kinetic energy developed by braking to recharge the batteries.