Method to allow trickle charging on strong hybrid vehicles to balance accessory loads

Abstract

The present invention provides a method to allow trickle charging on a strong hybrid vehicle to balance accessory loads. A method implemented by a control module for controlling a powertrain system comprising an internal combustion engine, at least one electric machine, a high voltage battery, and an electromechanical transmission operative to transmit torque to the driveline, the method comprising monitoring charging of the high voltage battery state (SOC), the high voltage battery is configured to provide stored electrical power to the first electric machine, the second electric machine and at least one auxiliary load. A trickle charge event is initiated only when the SOC of the high voltage battery is less than the first SOC threshold. A trickle charge event activates a first clutch coupled to the first planetary gear set. The trickle charge event further coordinates the torque capacity of the activated first clutch with the charge pack torque command between the engine, first electric machine, and second electric machine to establish a net zero output torque condition.

Description

technical field [0001] The present invention relates to powertrain systems employing multiple torque-generative devices and dynamic system controls associated therewith. Background technique [0002] The statements in this section merely provide background information related to the present invention. Accordingly, such statements are not intended to constitute an admission of prior art. [0003] A powertrain system may be configured to transmit torque from a plurality of torque-generative devices through a torque-transmitting device to an output member that may be coupled with the driveline. Such powertrain systems include hybrid powertrain systems and extended-range electric vehicle systems. Control systems for operating such powertrain systems operate the torque-generative devices and apply the torque-transmitting elements in the transmission to respond to operator commands while taking fuel economy, emissions, drivability, and other factors into account. output torque ...

AI Technical Summary

Problems solved by technology

One disadvantage may be that the torque provided by the engine cannot be used to charge the electrical energy storage device during neutral operation when the driveline is not mechanically disconnected from the driveline

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