Hybrid vehicle control system

A vehicle comprising:

• an internal combustion engine;
• an electric machine rotatably coupled to the engine and configured to deliver electrical power to electrical accessories;
• and
• a controller programmed to,
• in response to a control signal loss between the electric machine and the controller, limit torque output of electric machine to less than a torque threshold that corresponds to a power threshold,
• in response to an accessory power demand being greater than the power threshold, control the engine to power the electric machine to increase the torque output of electric machine to greater than the torque threshold to meet the accessory power demand, and
• in response to presence of the control signal, drive the torque output of the electric machine toward a desired torque regardless of the accessory power demand.

A power control system comprising:

• an electric machine configured to deliver electrical power to a first electrical subcomponent and a second electrical subcomponent;
• an internal combustion engine configured to deliver power to the electric machine;
• and
• a controller programmed to,
• control the electrical machine to a adjust a torque being delivered from the engine to the electric machine, and
• in response to a torque signal loss between the electric machine and the controller,
• limit electric machine torque to less than a threshold,
• control the engine to power the electric machine to supply an electrical voltage to the first and second subcomponents,
• calculate an estimated torque being delivered from the engine to the electric machine based on the voltage being delivered to the first and second subcomponents, an electrical current being delivered to the first and second subcomponents, and a rotational speed of the engine,
• calculate a desired torque of the electric machine based on the voltage and a desired electrical power of the first and second subcomponents, and
• in response to the desired torque being greater than the threshold, control the engine to power the electric machine to increase and drive the estimated torque of the electric machine to toward the desired torque meet the electrical power demand of the first and second subcomponents.