초록 ▼

An electric vehicle is controlled to conform its operation to that of a conventional internal-combustion-engine powered vehicle. In some embodiments, the charging of the batteries by the auxiliary source of electricity and from dynamic braking is ramped in magnitude when the batteries lie in a state

An electric vehicle is controlled to conform its operation to that of a conventional internal-combustion-engine powered vehicle. In some embodiments, the charging of the batteries by the auxiliary source of electricity and from dynamic braking is ramped in magnitude when the batteries lie in a state of charge between partial charge and full charge, with the magnitude of the charging being related to the relative state of charge of the battery. The deficiency between traction motor demand and the energy available from the auxiliary electrical source is provided from the batteries in an amount which depends upon the state of the batteries, so that the full amount of the deficiency is provided when the batteries are near full charge, and little or no energy is provided by the batteries when they are near a discharged condition. At charge states of the batteries between near-full-charge and near-full-discharge, the batteries supply an amount of energy which depends monotonically upon the charge state. Charging of the batteries from the auxiliary source is reduced during dynamic braking when the batteries are near full charge. Control of the amount of energy returned during dynamic braking may be performed by control of the transducing efficiency of the traction motor operated as a generator.

대표청구항 ▼

[ What is claimed is:] [1.] A method for operating a hybrid electric vehicle which derives at least some of its tractive effort from electric batteries, comprising the steps of:providing energy from a traction battery to a traction motor/generator in at least one operating mode of said hybrid electr

[ What is claimed is:] [1.] A method for operating a hybrid electric vehicle which derives at least some of its tractive effort from electric batteries, comprising the steps of:providing energy from a traction battery to a traction motor/generator in at least one operating mode of said hybrid electric vehicle;from time to time, dynamic braking said vehicle using said motor/generator, and returning to said batteries at least a portion of the electrical energy made available by said dynamic braking;during those intervals in which said dynamic braking is not performed, charging said batteries from an auxiliary source of electrical power separate from said motor/generator, said charging being in an amount suitable for normal operation of said vehicle; andduring those intervals in which dynamic braking is being performed, charging said batteries from said auxiliary source of electrical power, at a rate reduced from said amount.