Systems and methods for migitating cold start emissions by managing turbocharger turbine speed

A system for mitigating cold start emissions generated by a vehicle, comprising:

• at least one processor;
• and
• at least one memory communicatively coupled to the at least one processor, the at least one memory comprising instructions that upon execution by the at least one processor, causes the at least one processor to:
• receive an ignition turn on signal from an ignition switch of the vehicle;
• issue a first control signal to a wastegate actuator to completely open a wastegate to cause a first portion of exhaust gas generated by an engine of the vehicle to pass through a turbine of a turbocharger to a catalyst brick of the vehicle and a second portion of the exhaust gas to bypass the turbine and pass through the wastegate to the catalyst brick;
• issue a second control signal to a turbo shaft actuator to implement a zero-turbine speed by inhibiting rotation of the turbine, wherein:
• the exhaust gas generated by the engine has an engine exhaust temperature;
• rotation of the turbine at a default turbine speed results in the exhaust gas having a default turbine exhaust temperature after the exhaust gas passes through the turbine to the catalyst brick, the default turbine exhaust temperature being lower than the engine exhaust temperature;
• implementing the zero-turbine speed results in the first portion of the exhaust gas having an elevated turbine exhaust temperature after the first portion of the exhaust gas passes through the turbine to the catalyst brick, the elevated turbine exhaust temperature being lower than the engine exhaust temperature and higher than the default turbine exhaust temperature;
• and
• the second portion of the exhaust gas flowing through the wastegate to the catalyst brick has the engine exhaust temperature;
• receive oxygen sensor data associated with the catalyst brick from an oxygen sensor;
• determine a catalyst temperature based on the oxygen sensor data;
• determine whether the catalyst temperature is greater than a catalyst light-off temperature;
• and
• issue a third control signal to the turbo shaft actuator to rotate the turbine at the default turbine speed based on the determination.

A vehicle including a system for mitigating cold start emissions generated by the vehicle comprising:

• at least one processor;
• and
• at least one memory communicatively coupled to the at least one processor, the at least one memory comprising instructions that upon execution by the at least one processor, causes the at least one processor to:
• receive an ignition turn on signal from an ignition switch of the vehicle;
• issue a first control signal to a wastegate actuator to completely open a wastegate to cause a first portion of exhaust gas generated by an engine of the vehicle to pass through a turbine of a turbocharger to a catalyst brick of the vehicle and a second portion of the exhaust gas to bypass the turbine and pass through the wastegate to the catalyst brick;
• issue a second control signal to a turbo shaft actuator to implement a zero-turbine speed by inhibiting rotation of the turbine, wherein:
• the exhaust gas generated by the engine has an engine exhaust temperature;
• rotation of the turbine at a default turbine speed results in the exhaust gas having a default turbine exhaust temperature after the exhaust gas passes through the turbine to the catalyst brick, the default turbine exhaust temperature being lower than the engine exhaust temperature;
• implementing the zero-turbine speed results in the first portion of the exhaust gas having an elevated turbine exhaust temperature after the first portion of the exhaust gas passes through the turbine to the catalyst brick, the elevated turbine exhaust temperature being lower than the engine exhaust temperature and higher than the default turbine exhaust temperature;
• and
• the second portion of the exhaust gas flowing through the wastegate to the catalyst brick has the engine exhaust temperature;
• receive oxygen sensor data associated with the catalyst brick from an oxygen sensor;
• determine a catalyst temperature based on the oxygen sensor data;
• determine whether the catalyst temperature is greater than a catalyst light-off temperature;
• and
• issue a third control signal to the turbo shaft actuator to rotate the turbine at the default turbine speed based on the determination.