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:in operating modes of said vehicle other than a braking state, providing energy to a traction motor from an auxiliary sourc

[ 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:in operating modes of said vehicle other than a braking state, providing energy to a traction motor from an auxiliary source, and also providing the difference between the traction power demand and the supply from the auxiliary source from said batteries, up to the maximum capability of said batteries, when said batteries are in a state of charge lying between a first state of charge and full charge;in said operating modes of said vehicle other than a braking state, providing energy to said traction motor only from said auxiliary source, when said batteries are in a second charge state, representing a substantially discharged state of said batteries; andin said operating modes of said vehicle other than a braking state, providing energy to said traction motor from said auxiliary source, and also supplying energy to said traction motor from said batteries in an amount less than the full capability of said batteries, when said batteries are in a state of charge lying between said discharged state and said first state of charge.