“Accelerator Control System (ACS) safety standard” in almost all around the world says that “The throttle shall return to the low idle position from any accelerator position or any speed which the engine is capable of”. It also dictates that “The return to low idle position shall occur within the time limit specified measured either from the time of severance or disconnection or from the first removal of the opposing actuating force by the driver”. This limit is maximum 3 second for all type of vehicle. The low idle is defined as “Low idle position’ means the position of the throttle at which it first comes in contact with an engine idle speed control appropriate for existing conditions according to the manufacturer’s recommendation. These conditions include, but are not limited to, engine speed adjustments for cold engine, air conditioning and emission control and the use of throttle setting device.”
When I start my Hyundai Verna diesel car (1.6 manual) it idles at around 800 rpm as shown in techometer. When i change the gears without even touching the accelerator, the car accelerates to different speeds in different gears and in the process the rpm also increases to above 1000rpm in 6th gear and a speed of around 60kmph (without even touching accelerator pedal). On the contrary, when I release the accelerator pedal at say around 65 kmph in 6th gear, it doesnt slows down and maintain speed of 60kpmh at above 1000rpm. (I do this with two persons sitting (around 60kg each) and AC off (so that dynamic load change does not occur) and windows closed (so air pressure inside car does not change the load)).
My question is whether my car conforming to this ACS as my car is not slowing down on releasing the accelerating pedal while other cars in market do slows down. I talked to company many times and they are not giving anything in writing just saying that all Hyundai diesel cars behave similarly. Also I would like to know that whether low idle position should change merely because of changing of gear? or it is because of some electronic control in violation of the ACS safety standards
Also what does it mean when it says that " low idle position means the position of the throttle at which it first comes in contact with an engine idle speed control"? Does it mean when we start the vehicle in neutral or in first gear? does it also means that at in any gear when accelerator is released the engine idle should return to the original value that we observed at start (provided load does not change e.g. by AC, Temp etc)
Do any one have any link that talk in detail about "throttle low ldle position as well as legal positions of the ACS safety standards