HYBRID ELECTRIC VEHICLE WITH REDUCED AUXILIARY POWER TO BATTERIES DURING REGENERATIVE BRAKING

摘要

AN ELECTRIC VEHICLE (10) IS CONTROLLED TO CONFORM ITS OPERATION TO THAT OF A CONVENTIONAL INTERNAL-COMBUSTION-ENGINE POWERED VEHICLE. IN SOME EMBODIMENTS, THE CHARGING OF THE BATTERIES (20) BY THE AUXILIARY SOURCE (16) 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 (20).THE DEFICIENCY BETWEEN TRACTION MOTOR (40) DEMAND AND THE ENERGY AVAILABLE FROM THE AUXILIARY ELECTRICAL SOURCE (16) IS PROVIDED FROM THE BATTERIES (20) IN AN AMOUNT WHICH DEPENDS UPON THE STATE OF THE BATTERIES (20), SO THAT THE FULL AMOUNT OF THE DEFICIENCY IS PROVIDED WHEN THE BATTERIES (20) ARE NEAR FULL CHARGE, AND LITTLE OR NO ENERGY IS PROVIDED BY THE BATTERIES (20) 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 MONOTONICAILY UPON THE CHARGE STATE.CHARGING OF THE BATTERIES FROM THE AUXILIARY SOURCE (16) 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 (40) OPERATED AS A GENERATOR.(FIG 1)