Apparatuses, methods, and systems for thermal management of hybrid vehicle SCR aftertreatment

A method comprising:

• providing a hybrid vehicle system including an internal combustion engine, a motor/generator, an SCR exhaust aftertreatment system including an SCR catalyst and an electrical heater, and an energy storage device;
• determining a flow of exhaust gas from the internal combustion engine;
• determining an SCR temperature of the SCR aftertreatment system;
• determining a state of charge of the energy storage device,
• determining a regenerative braking event;
• and
• controlling the electrical heater to receive power simultaneously from the energy storage device and from the motor/generator during the regenerative braking event to heat the SCR catalyst when the state of charge of the energy storage device is at a maximum charge threshold to reject energy generated during the regenerative braking event as heat through the electrical heater to maintain consistent braking.

A hybrid vehicle system comprising:

• an engine operable to output exhaust;
• an SCR exhaust aftertreatment system including an SCR catalyst and a decomposition reactor configured to receive exhaust from the engine and a doser upstream of the SCR catalyst operable to introduce reductant into the decomposition reactor;
• an electrical heater operable to heat exhaust in the decomposition reactor, wherein the electrical heater is located in the decomposition reactor upstream of the doser;
• a motor/generator operable as a motor to output torque and operable as a generator to output electrical power;
• an energy storage device operable to provide electrical power to the motor/generator and receive electrical power from the motor/generator;
• and
• a controller operable to determine a temperature condition of the exhaust entering the decomposition reactor and control the electrical heater to heat exhaust in the decomposition reactor using power from the energy storage device or power from the motor/generator based upon the temperature condition of the exhaust entering the decomposition reactor.