DC/AC inverter system supplied by integrated power networks to increase output power with robust auto stop control

A vehicle electrical system adapted for use with an internal combustion engine which is operated according to an auto start-stop function which automatically stops the engine under first predetermined conditions and then restarts the engine under second predetermined conditions, comprising:

• a first DC bus adapted to connect to a plurality of DC loads;
• a primary battery coupled between the first DC bus and a ground;
• a first alternator configured to be driven by an internal combustion engine to supply electrical power to the first DC bus;
• a starter motor coupled to the first DC bus for restarting the engine using electrical power from the primary battery;
• a second DC bus;
• an auxiliary battery with a positive terminal connected to the second DC bus and a negative terminal connected to the first DC bus;
• a second alternator configured to be driven by the internal combustion engine to supply electrical power to the second bus at a voltage corresponding to a sum of voltages of the primary and auxiliary batteries;
• and
• an inverter receiving electrical power from the second DC bus to generate an AC output adapted to connect to accessory AC loads, wherein the inverter receives electrical power from the auxiliary battery and the primary battery when the engine is automatically stopped.

A vehicle electrical system, comprising:

• a first DC bus adapted to connect to a plurality of DC loads;
• a primary battery coupled between the first DC bus and a ground;
• a first alternator configured to be driven by an internal combustion engine to supply electrical power to the first DC bus;
• a second DC bus;
• an auxiliary battery with a positive terminal connected to the second DC bus and a negative terminal connected to the first DC bus;
• a second alternator configured to be driven by the internal combustion engine to supply electrical power to the second bus at a voltage corresponding to a sum of voltages of the primary and auxiliary batteries;
• and
• an inverter receiving electrical power from the second DC bus to generate an AC output adapted to connect to accessory AC loads;
• wherein the second alternator is regulated according to a setpoint, wherein the setpoint has a maximum value when the vehicle is decelerating, and wherein the setpoint has a minimum value when the vehicle is accelerating.