Re: Calibration of Sensors used in cars? Quote:
Originally Posted by a4anurag I wanted to know the frequency of calibration need for these sensors if at all they are needed to be calibrated.
There are many sensors used by the ECU to transit/receive data to according programme the car to run efficiently and smoothly. How does one know the sensor condition and is not required to calibrate them? Just changing oils and filter do the trick? |
Hi Anurag
As you listed down, there are numerous sensors in a new generation automobile which gives inputs to the different ECUs.
Since I work on brake systems, I can list the example of few of the sensors used in ABS / ESC.
(1) Wheel speed sensors - do not require any calibration. They work on simple electromagnetic induction principle and sense the wheel speeds within a specified range. They do not lose their calibration even when the battery / dome fuse is disconnected.
(2) Steering angle sensor - this is used in cars equipped with Electronic Stability Control (ESC) for measuring the steering angle. In vehicle assembly lines, there is a station where the straight-ahead position of the steering wheel is set and the steering angle sensor 'zero' position is calibrated. Unless one disconnects the battery / removes the dome fuse (which happens during long duration shipment to overseas locations), the sensor retains the zero position.
In case the power is disconnected, there is a simple procedure given in the Owner's Manual for recalibration of the steering angle sensor by driving forward in the straight ahead position for so many seconds / so much distance (slightly varies across OEMs).
In my opinion, all the sensors in a vehicle either do not require calibration, or once calibrated, do not require recalibration.
In case a sensor loses calibration (cannot see how, unless it is damaged), there will definitely a tell-tale in the cluster denoting a malfunction (of the system, for e.g. MAP sensor malfunction will throw up Engine Malfunction lamp).
A diagnostic tester will show which sensor is malfunctioning.
Hope this answers your question, at least partially!
Regards |