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|Honda Develops New Integrated Motor Assist (IMA) System|
|Tokyo, September 19, 1997 --- Honda Motor Co., Ltd. announced today the development of a new power unit, the "Honda Integrated Motor Assist (IMA) System." This ultra-low fuel consumption power unit achieves consumption figures in excess of 30 km per liter of fuel (10.15 mode).
Fuel consumption reduction (and the consequent reduction in CO2 emissions) is, together with cleaner exhaust emissions, one of the main concerns of the automobile industry today. Honda has contributed to this end with the development and sale of ever more efficient engines combining high power through the use of VTEC technology and reduced fuel consumption in daily driving conditions with the adoption of advanced lean-burn technology.
At the heart of this system is a totally new, compact and lightweight three-cylinder direct fuel-injection engine of 1.0-liter capacity. Friction reduction, lightweight technology, and a widening of the lean-burn range are some of the aspects characterizing this engine. A newly developed direct injection system, allowing fuel to be injected directly into the combustion chamber from a centrally located injector, is combined with VTEC technology to promote ultra-lean-burn combustion and further reduce fuel consumption.
IMA System's Engine Efficiency
An ultra-thin motor/generator is attached to this engine to serve as an additional source of power when accelerating, and to achieve performances exceeding that of a 1.5-liter engine. For further reduced fuel consumption, this same motor/generator transforms kinetic energy into electric power when braking.
A continuously variable Honda MultiMatic transmission was chosen here for its low transmission loss and the ability to always maintain the engine and motor/generator within their most efficient rotational speed ranges. Ultra capacitor-type accumulators were adopted for their light weight and long life, providing high storage capacity within only 30 kg of weight.
Adding this motor assist function to an already very efficient engine-transmission combination has allowed great strides in fuel consumption reduction. Weight increase over a 1.5-liter car is held down to some 50 kg.
The Honda IMA System
Honda IMA System Layout
3 cylinder 1.0-liter gasoline engine
Torque Variation Control