Does a Knock Sensor Signal Being Too Small Have Any Impact?
1 Answers
Knock sensor signal being too small is a normal phenomenon. The knock sensor signal generally does not display, and it only changes when the throttle is rapidly accelerated. You can observe the data stream; tapping the sensor with a screwdriver will cause a noticeable change in the data stream, indicating that the sensor is functioning properly. The function and principle of the knock sensor are as follows: 1. The knock sensor is an AC signal generator, which is quite different from most other automotive AC signal generators. In addition to detecting the speed and position of the rotating shaft like magnetic crankshaft and camshaft position sensors, they also detect vibration or mechanical pressure. 2. Engine knock caused by premature ignition, poor exhaust circulation, low-grade fuel, and other reasons can lead to engine damage. Some systems provide knock signals through the control module PCM, allowing the computer to readjust the ignition timing to prevent further knocking. They essentially act as the "oxygen sensor" in the ignition timing feedback control loop. 3. Knock sensors are installed at different positions on the engine block or cylinders. When vibration or knocking occurs, they generate a small voltage peak; the greater the knocking or vibration, the higher the peak voltage produced by the knock sensor.
