维基百科的定义：
Idle speed is the rotational speed the engine runs on when the engine is uncoupled to the drivetrain and the throttle pedal isn't depressed (generally measured in revolutions per minute, or rpm, of the crankshaft) of a combustion engine.

uncoupled to the drivetrain就应该是不往车轮输出动力吧？


【 在 grahamiao (Griffon's Eye) 的大作中提到: 】
: 就是怠速，还用解析什么需求，总不能自动加油吧
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