Drive control apparatus and method for providing a drive control to a hybrid electric vehicle, and hybrid electric vehicle

摘要

An apparatus that both prevents excessive engine speed and satisfies a driver's requested drive torque. A control apparatus provides torque control to a hybrid electric vehicle and uses a calculated engine speed final target, and engine speed temporary target, which may not exceed an upper limit. In addition the control recalculates an engine operating point target based on the calculated engine speed final target and calculates an engine power final target based on the recalculated engine operating point target. An electrical power target is calculated based on the calculated engine power final target. Engine torque is controlled based on the calculated engine operating point target (especially the engine torque final target). In addition, motor generators are controlled to operate in power running mode or regenerating mode, based on the calculated engine operating point target and electrical power target.

主权项

1. A drive control apparatus for providing a drive control to a hybrid electric vehicle by controlling an engine and motor generators, which are operable to give a charge of electrical power to a battery and receive a supply of electrical power from said battery, to power the vehicle with driving force derived from said engine and said motor generators, the drive control apparatus comprising:
a drive power target calculation function for calculating a drive power target based on an accelerator pedal position and a vehicle speed; a charge/discharge power target calculation function for calculating a charge/discharge electrical power target to/from said battery based on a state of charge/discharge of said battery; an engine power first target calculation function for calculating an engine power first target based on the drive power target, which is calculated by said drive power target calculation function, and the charge/discharge electrical power target, which is calculated by said charge/discharge power target calculation function; an engine operating point first target calculation function for calculating an engine speed first target and an engine torque first target, both of which correspond to the engine power first target calculated by said engine power first target calculation function, based on information of the engine operating point identified by the relation between engine speed and engine torque; an engine speed first target upper limit calculation function for calculating an upper limit of said engine speed first target based on the vehicle speed; an engine speed second target calculation function for calculating an engine speed second target indicative of the engine speed first target which is calculated by said engine operating point calculation function so as not to exceed that upper limit of the engine speed first target which is calculated by said engine speed first target upper limit calculation function; an engine torque second target calculation function for calculating an engine torque second target, which corresponds to said engine speed second target calculated by said engine speed second target calculation function, based on said information of the engine operating point; an engine power second target calculation function for calculating an engine power second target based on the engine speed second target which is calculated by said engine speed second target calculation function and the engine torque second target which is calculated by said engine torque second target calculation function; an electrical power target calculation function for calculating an electrical power target indicative of the amount of electrical power to be generated by driving said motor generators to charge said battery or to be provided by said battery to said motor generators to drive said motor generators, based on a difference between the drive power target which is calculated by said drive power target calculation function and the engine power second target which is calculated by said engine power second target calculation function; an engine control configured to control torque of said engine based on the engine torque second target which is calculated by said engine torque second target calculation function; and a motor generator control configured to control said motor generators based on the engine speed second target which is calculated by said engine speed second target calculation function, the engine torque second target which is calculated by said engine torque second target calculation function, and the electrical power target which is calculated by said electrical target calculation function.