Hyundai i20 Quiz
Engine/Fuel Control System

KNOCK SENSOR (KS) Description and Operation

In this manual: Engine/Fuel Control System
General Information — 17Engine Mechanical System — 79Engine Electrical System — 50Emission Control System — 22Engine/Fuel Control System — 107Clutch System — 27MANUAL TRANSMISSION SYSTEM — 21Drive Shaft and Axle — 18Suspension System — 29Steering System — 21Restraint — 41Braking System — 53Body Work (Interior and Exterior) — 190Body Electrical System — 181Heating, Ventilation and Air Conditioning — 58
~1min read

Description

Knock is a phenomenon characterized by vibration and noise that can cause engine damage. The Knock Sensor (KS), installed on the cylinder block, detects engine knock. When knock occurs, the cylinder block vibration is applied as pressure to the piezoelectric element. During knock, the sensor outputs a voltage signal. The ECM retards ignition timing when knock occurs. If the knock disappears after the ignition timing is retarded, the ECM advances the ignition timing. This sequential control can improve torque, engine power and fuel economy.

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A quick Hyundai i20 quiz: every answer comes with an explanation and a link to the manual page.