Heat Plates
Heat plates are used to lower the warm up emissions. They vaporize the injected fuel before it is drawn/forced into the cylinders and consequently reduce the need for added fuel in the A/F mixture in the warm up phase thus reducing the emissions. At engine start and coolant temperature lower than +85°C Pin 29 on ECU is grounded and a relay in the engine compartment are activated and closes the electrical circuit for the Heat Plates. The circuit is protected by a 40 A MAXI fuse. When the coolant temperature is warmer than +85°C or four minutes has passed the Heat Plates are switched of.
To compensate for the increased air resistance in the intake, engines fitted with Heat Plates have a slightly adjusted charge pressure, Approximately: +0.2 bar, this means that LPT models with heat plates have a solenoid valve to raise the charging pressure above basic charging pressure.
In case of a Heat Plate-failure the car may have drivability problems due condensed fuel in the intake during cold engine operations. This condensed fuel is compensated in engines without Heat Plates by enriching the A/F mixture.
The heat plates are activated by software, which enables different algorithms to use the plates and to compensate for the intake restriction caused by the plates' presence.
Read more about this topic: Trionic T5.5
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