Systems and methods for engine start

A hybrid battery system for starting and restarting an engine of a vehicle, the hybrid battery system comprising:

• a DC/DC converter;
• a supercapacitor system configured to provide electric power to the engine during engine starting at low temperature and be recharged when the engine is running;
• and
• a lithium-ion battery removably connected to the vehicle and configured to pre-charge the supercapacitor system when the engine is not running.

A method for restarting an engine in a reverse direction, the method comprising:

• receiving, by an engine control unit, a user request to reverse engine rotation while engine is running;
• determining, by the engine control unit, whether one or more parameters satisfy predefined condition to perform reverse engine rotation;
• performing, in response to determining that the one or more parameters satisfy reverse engine rotation requirements and by the engine control unit, an engine reverse process by switching a starter-generator controller to a starter mode;
• applying, by the starter-generator controller, braking torque to a crankshaft of the vehicle by sending excess power to a power source to decelerate a speed of the crankshaft;
• developing, by the starter-generator controller, torque in an opposite direction of a current rotation of the crankshaft by using energy from the power source;
• and
• switching, in response to determining that the crankshaft is rotating in the opposite direction, by the engine control unit, the starter-generator controller back to a voltage regulator mode and recharge the power source.

An electric reverse control system for restarting an engine in a reverse direction, the electric reverse control system comprising:

• a power source;
• a reverse control user input configured to receive a user request to reverse engine rotation;
• an engine control module (ECM) configured to:
• receive the user request to reverse engine rotation while engine is running,
• determine whether one or more parameters satisfy predefined condition to perform reverse engine rotation,
• perform, in response to determination that the one or more parameters satisfy reverse engine rotation requirements, an engine reverse process by switching a starter-generator controller to a starter mode, and
• control operations of the starter-generator controller;
• and
• a starter-generator controller having a starter mode and a voltage regulator mode, the starter-generator controller configured to:
• apply braking torque to a crankshaft of the vehicle by sending excess power to the power source to decelerate a speed of the crankshaft, and
• develop torque in an opposite direction of a current rotation of the crankshaft by using energy from the power source.

An engine starting system for starting and restarting an engine of a vehicle, the engine starting system comprising:

• a DC/DC converter;
• an integrated starter generator (ISG) configured to recharge the lithium-ion capacitors when the engine is running;
• and
• lithium-ion capacitors configured to provide power to start and restart the engine.

A starter-generator system for providing electric start of an engine of a vehicle, the starter-generator system comprising:

• an integrated starter-generator (ISG);
• a power source module including a power source and a bidirectional DC/DC voltage converter, wherein the power source is configured to supply power during engine starting and is recharged when the engine is running and the bidirectional DC/DC voltage converter is configured to provide charging of the power source;
• an energy storage configured to supply power when engine is running;
• and
• a starter-generator (ISG) controller configured to apply power to a stator for engine starting from the power source and to take power from the stator when running to supply an electrical load of vehicle from the energy storage.

A starter-generator system for providing electric start of an engine of a vehicle, the starter-generator system comprising:

• a removeable power source removably coupled to the vehicle;
• a bidirectional DC/DC converter for charging the removeable power source from a vehicle power when the engine is running, supplying power to the vehicle prior to engine starting, and supplying power to in-vehicle infotainment and vehicle functions when an ignition key is off;
• and
• an integrated starter generator (ISG) operatively coupled to the removeable power source to provide a higher voltage to increase a starting torque.

A method for supplying power for vehicle starting from a removeable power source, the method comprising:

• receiving a first user input while the removable power source is in an off state;
• transitioning, in response to receiving the first user input, the removable power source to a wake state;
• determining if a power capacity exceeds a predetermined threshold for electric start;
• transmitting, in response to determining that the power capacity exceeds the predetermined threshold for electric start, a notification to a user indicating that the electric start is possible;
• receiving a second user input requesting to electric start an engine;
• and
• supplying, in response to receiving the second user input, electrical power from the removable power source to an engine control module to produce starting torque.

A method for supplying power for vehicle starting from a removeable power source, the method comprising:

• determining if a vehicle is turned on and engine is not running;
• determining if a power capacity exceeds a predetermined threshold for electric start;
• transmitting, in response to determining that the power capacity exceeds the predetermined threshold for electric start, a notification to a user indicating that the electric start is possible;
• receiving a user input requesting to electric start an engine in reverse;
• and
• operating, in response to receiving the user input, electrical power to an integrated starter-generator to turn engine in reverse direction.