Method of starting a four stroke engine using compressed air
A method is disclosed for starting a four stroke engine having a compressed air supply, the engine being provided with cam actuated intake and exhaust valves adapted to operate selectively with a first valve timing schedule that causes the engine to act as a compressed air driven motor and with a second schedule that causes the engine to perform as a four stroke cycle internal combustion engine. Prior to each engine shut down, the invention proposes operating the engine with the first valve timing schedule for a short period of time with the fuel supply discontinued to precondition the engine for a restart. During subsequent restarting of the engine, the engine is at first operated with the first valve timing schedule and connected to the compressed air supply to crank the engine. On reaching a desired cranking speed, the compressed air supply is discontinued and the valve timing is switched back to the second schedule and normal engine aspiration and fuelling are resumed. The invention may be used in stop-start sytems.
MA THOMAS TSOI HEI [GB]; ZHAO HUA [GB]
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