Abstract: A parallel hybrid electric vehicle powertrain and control method wherein an internal combustion engine and an electric motor system define a split power operating mode, a generator drive mode and a parallel power mode. Provision is made, when the motor is inoperable, for preventing discharge of a battery in the electric motor system when the battery state-of-charge is low and for delivering power from the battery when the battery state-of-charge is greater than a predetermined value.

Abstract: A method for heating a battery in a hybrid electric vehicle. The hybrid electric vehicle has an engine, a battery, a motor generator powered by the engine or the battery, and a control module. The method includes the steps of determining a battery temperature and determining whether a tip-in event, a tip-out event, or a terminal voltage event has occurred. The polarity of the battery is reversed if the battery temperature is below a predetermined value and if a tip-in event, a tip-out event, or a terminal voltage event has occurred.

Abstract: A parallel hybrid electric vehicle powertrain and control method wherein an internal combustion engine and an electric motor system define a split power operating mode, a generator drive mode and a parallel power mode. Provision is made, when the motor is inoperable, for preventing discharge of a battery in the electric motor system when the battery state-of-charge is low and for delivering power from the battery when the battery state-of-charge is greater than a predetermined value.

Abstract: A method and system for controllably transferring energy from a high voltage bus to a low voltage bus in a hybrid electric vehicle. A vehicle system controller controls a DC/DC converter coupled between the high voltage bus and the low voltage bus to control the transfer of energy therebetween.

Abstract: An indicator to indicate an amount of power available from an energy storage device. The indicator normalizes raw power values to values which are understood by the driver. The indicator indicates the normalized values to facilitate making a driving decision.

Abstract: A parallel hybrid electric vehicle powertrain and control method wherein an internal combustion engine and an electric motor system define a split power operating mode, a generator drive mode and a parallel power mode. Provision is made, when the motor is inoperable, for preventing discharge of a battery in the electric motor system when the battery state-of-charge is low and for delivering power from the battery when the battery state-of-charge is greater than a predetermined value.

Abstract: The present invention provides an improved method and system to monitor vehicle operation state and operator requests. The invention combines into a single, easy to read, gauge information indicating the current vehicle operating state and the ability to increase power assist. This involves a display of instantaneous rate of consumption usage superimposed over the available rate of power consumption limits. The present invention can display whether an operator is requesting power assist, regenerative braking or battery charging while also showing the amount of power assist, regenerative braking or battery charging that is possible for the vehicle under present operating conditions. Through the use of a vehicle system controller (VSC) or similar type controller connected to the display of the present invention, the instantaneous rate of consumption usage or charge can be limited to the available rate of power consumption or charge limits.

Abstract: The invention is an improved method and system to monitor vehicle operation state and operator requests. It combines into a single gauge information indicating current vehicle operating state and ability to increase power assist using a display of instantaneous rate of consumption usage superimposed over available rate of power consumption limits. The invention can display whether an operator is requesting power assist, regenerative braking or battery charging while also displaying the available amount of each under present operating conditions. A vehicle system controller (VSC) or similar type controller is connected to the gauge, which can limit instantaneous rate of consumption usage or charge to the available rate of power consumption or charge limits. The invention can use analog needles or LEDs in various configurations as well as adding warning lamps or chimes when the instantaneous rate of consumption usage approaches or exceeds the available rate of power consumption limits.