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공임
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부품비
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소요 시간
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2026. 6. 30. 작업
난이도 & 준비물
증상
Do pistons keep moving when the car stops?
처리 내용
The answer to your question is both yes and no. Yes in majority of the conventional vehicles, the pistons keeps moving even when the vehicles is at a stop light. The idle RPM, which is usually between 600RPM to 1000RPM, signifies the speed of the crankshaft. The fuel is calculated by the ECU (or ECM or PCM) depending upon the load, which is a calculated based on readings from Mass Air Flow sensor, Manifold Absolute Pressure sensor, Intake Air Temperature sensor and Throttle Position Sensor. Nowadays there is start-stop technology implemented in vehicles (commonly found in hybrid technology) and I have also heard of conventional vehicles having this feature. Basically engine shuts off when the vehicle is not moving to save fuel and as soon as the driver touches the throttle pedal, depending upon the load demand (aka throttle position etc.) fuel and spark timing is calculated by the computer and combustion begins to keep the vehicle transition smooth.
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