Electronically-Controlled Honda valve used in Honda Insight

Production   : 1999–2006
                      2008–present
Model years : 2000–2006
                      2010
Layout : Front Engine Front Front wheel drive

       

         The first generation Honda Insight hybrid contains a 1.0L 3-cylinder engine.
Given that the optimal EGR valve opening varies with load, coolant temperature, pressure differential between exhaust and intake manifold (and other factors), electronically-controlled operation of the EGR valve has obvious advantages. All external EGR systems fitted to current diesel and spark ignition cars use electronically-controlled flow valves.

This Bosch spark ignition EGR system uses a vacuum-controlled EGR valve that is electronically controlled by the ECU.

This Honda system uses an electronically-controlled EGR valve that incorporates a feedback sensor to determine the actual valve opening that is occurring.

                          Here is the electronically-controlled Honda valve that is used on the Honda Insight.

This is a generic diagram of a typical diesel car EGR system. The important point to note is the presence of the airflow meter. By comparing the modelled airflow requirements of the engine (based on rpm, intake manifold pressure, intake air temp and volumetric efficiency) with the actual amount of air being breathed, the amount of EGR that is occurring can be calculated and adjusted as required.