| CPC F02D 41/0007 (2013.01) [F02M 35/10157 (2013.01); F02D 2200/04 (2013.01); F02D 2200/1002 (2013.01)] | 7 Claims |
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1. A drive control system comprising:
an engine comprising a cylinder and a piston provided in a slidable manner inside the cylinder, the engine being configured to rotate a crankshaft in accordance with sliding of the piston;
an electric turbocharger configured to supply compressed air into the cylinder; and
a controller comprising:
at least one processor; and
at least one memory coupled to the at least one processor, and
wherein the at least one memory stores a turbocharging-condition map including turbocharging-operation conditions, each of which (1) specifies a turbocharging start timing, a turbocharging duration, and an output of the electric turbocharger, and (2) is associated with a corresponding pair of engine rotation speed and oil temperature of lubricating oil of the engine, and
wherein the at least one processor is configured to:
determine that a stoppage condition is met;
acquire engine rotation speed and oil temperature in response to determining that the stoppage condition is met;
identify one of the turbocharging operation conditions based on the acquired engine rotation speed and oil temperature to acquire the turbocharging start timing, the turbocharging duration, and the output of the electric turbocharger specified in the identified one of the turbocharging operation conditions;
transmit a stoppage signal for stopping the engine to the engine;
start a turbocharging operation based on the specified turbocharging start timing, after the stoppage signal is transmitted to the engine; and
execute the turbocharging operation to control the turbocharger to supply the compressed air to the cylinder based on the specified output of the electric turbocharger for the specified turbocharging duration such that the piston stops at a position where a crank angle is within a predetermined range from 60° before a top dead center to 30° before the top dead center.
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