| CPC F02D 41/0007 (2013.01) [F02B 37/10 (2013.01); F02B 37/14 (2013.01); F02B 39/10 (2013.01); F02D 2200/04 (2013.01)] | 19 Claims |
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1. A control system for an engine comprising an electric turbocharger, the system comprising:
a wastegate valve configured to variably open and close to control a flow of exhaust gas in an exhaust system of the engine at a turbine of the electric turbocharger; and
a controller configured to:
obtain a set of parameters that each affect exhaust gas energy;
using the set of parameters:
(i) determine a target mass flow into the engine and a target boost for the electric turbocharger to achieve a torque request;
(ii) determine a target power for a compressor of the electric turbocharger to achieve the target engine mass flow and the target electric turbocharger boost;
(iii) determine an electric turbocharger motor power target;
(iv) determine, based on the target power for the compressor and the electric turbocharger motor power target, a target pressure ratio and a target mass exhaust flow for the turbine of the electric turbocharger to achieve a target turbine power equal to the target compressor power; and
(v) determine a target position of the wastegate valve to achieve the target turbine pressure ratio and mass exhaust flow; and
command the wastegate valve to the target position.
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