Idle Control

 

To use idle control, the unit requires an RPM pulse. Any number of pulses per revolution could be used up to 60. This will calibrate the rev counter in the software easily. You may compare it to the ECU Tachometer. Ex. Should you use a 36-2 trigger wheel then select 34 pulses which will represent one engine revolution.

Note that a big part of idle control lies in fuel and timing tuning. See the section in the ECU manual how to compensate for idle control. Otherwise the ECU and TxW may end up amplifying control parameters and then oscillate the idle control.

 

The Gear Teeth block is used for this value.

 

The rest of the idle control settings is the same as is used in the ECU. See description below.

 

 

 

Idle Control Type

If idle control is used, then select Idle Valve. Otherwise select Not Used. If idle valve is selected, then the RPM signal will become active. Otherwise it is disabled because it is not required.

 

RPM

This setting is the target idle RPM’s when the engine is on running temperature. Note that the min idle setting or the cold temperature compensation may cause the engine to idle at a higher value.

 

Start %

This setting is used to increase the air intake when the engine is started hot or cold. The ECU will open the idle valve to this %. Once the engine reaches 500 RPM it will cancel this setting and go to normal throttle operation. If you press the pedal, then this setting will be override.

 

Response Time Up

This setting will determine the rate at which the valve opens when the actual RPM’s fall below the set point in Idle RPM. The further the RPM fall below the set point, the faster the ECU will open the valve to let in more air. Low values will create a faster response time and high values will create a slower response time. This setting must prevent the engine from stalling when you switch the air conditioner on, or put it in drive.

 

Response Time Down

This setting will determine the rate at which the valve closes when the actual RPM’s go above the set point in Idle RPM. The further the RPM goes above the set point, the faster the ECU will close the valve to decrease airflow into the engine. This value is set higher than the Response Up value, to eliminate hunting. Low values will create a faster response time and high values will create a slower response time. This setting must bring fast idling down as fast as possible without hunting the engine.

 

Low Limit duty cycle

This setting will preload the TxW so that the valve does not close beyond this value. It is used as min idle when there is no temperature sensor connected. To set the value start with a larger % and decrease until the desired idling RPM is reached in neutral when the engine is on working temperature. Note that the throttle modulation or cold start compensation may override this value.

 

High Limit duty cycle

This setting is used to limit the maximum throttle opening. It is set at 100 to open the throttle fully. It may be used as power limiter by entering lower values.

 

TPS Idle Cutoff %

This value is used to disable the idle control when the driver touches the throttle. The reason is that the ECU must know when not to control idle as the driver may need just a minimal amount of revs with slight throttle.