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

摘要

An upper rotational speed limit NengUL and a lower rotational speed limit NengLL of an engine operation prohibition area are set from an upper rotational speed limit Nmg2UL and a lower rotational speed limit Nmg2LL of a motor operation predetermined prohibition area of a second motor generator. When an engine speed target Nengt, calculated from a preset target operating line, lies in the engine operation prohibition area, the engine operating point target is corrected so that the second motor generator rotational speed target Nmg2t lies outside the motor operation prohibition area. When the engine speed target Nengt is greater than or equal to a change-direction engine speed NengCD at which direction of shift to/from an allowable range of engine operation is changed, the engine speed Neng is increased. When the engine speed target Nengt is less than the change-direction engine speed NengCD, the engine speed Neng is decreased.

主权项

1. A drive control apparatus for a hybrid electric vehicle, which is driven, via a powertrain, by using the output of an engine and the output of a motor operable on power supplied by a battery, comprising:
a drive control arrangement configured to correct an engine operating point target defined by an engine speed target and an engine torque target such that, when a rotational speed of said motor comes to lie in a prohibition area of motor operation that is a predetermined range in the neighborhood of 0 rpm of the rotational speed of said motor while driving the vehicle by controlling operating conditions of said engine and motor, the drive control arrangement corrects the engine operating point target so that the rotational speed of the motor lies outside the prohibition area of motor operation; wherein a prohibition area of engine operation includes an engine rotational speed upper limit and an engine rotational speed lower limit, and wherein a shift direction changing engine speed is set in the drive control arrangement, and further wherein the shift direction changing engine speed is between the engine rotational speed upper limit and the engine rotational speed lower limit; and wherein when the engine speed target is within said prohibition area of engine operation, said drive control arrangement corrects the engine speed target to increase engine speed when said engine speed target is greater than or equal to the shift direction changing engine speed or to decrease engine speed when said engine speed target is less than the shift direction changing engine speed.