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Nauman Ashraf email:
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Dear Mr. Asad,
Thankyou for your reply. I understand that your area is not directly automotive repairing.
Okay for your ease, I am attaching a picture and explaining a situation.
This is an OBD2 recorded data of a Honda City 2009 (DBW engine) with an automatic transmission.
As you can see, the blue is engine rpm, and when the gear changes, the commanded throttle (dotted red) is closed and opened back again.
Ideally it is supposed to reduce shift jerk. But its causing a problem. A problem that i can only explain you with the help of a accelerometer
graph. For simplicity, lets say that the close/open movement of throttle with availabe fuel grade in pk doesnot allow engine to match speed load requirement timely and I feel a reverse jerk (like a pull) during a gear shift. This is reduced with using higher RON fuel.
What I am looking for is to remove this closed/open command of throttle during shift using the help of Pedal Sensor input. As long as the Pedal sensor is within a specified deadband of its last value, the throttle close signal is rejected and last value is retained and fed to throttle actuator.
Or you can say, The controller is supposed to follow commanded throttle as per ECU and reject negative d/dt greater than a certain value and retain last input.
This way, the throttle will respond like a drive by cable system during gear shifts. At all other times, it shall follow command from ECU.
I can explain more detail on phone. And yes i can call you on wednesday at the communicated time. Your phone number is still awaited.
Regards,
Nauman
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Mr Nauman for ur kind Information i have not implemented any jerk suppressor but it is possible