Method for regulating the generator voltage in a motor vehicle
First Claim
1. A method for regulating a generator in a vehicle power supply system including a plurality of loads and at least one battery with a regulator, said method comprising:
- regulating the generator output voltage at the value of a nominal value voltage in one of a recuperation readiness mode and a recovery mode;
setting the nominal value voltage in said recuperation readiness mode as a function of driving state variables such that, during braking or when the vehicle is overrunning, the generator and battery are operated in a recuperation operation, in which the generator converts kinetic energy of the vehicle to electric power that is fed into the vehicle power supply system and charges the battery;
setting the nominal value voltage (U_nom) in the recovery mode such that the battery is regenerated from degradation due to stress caused by charging during a recuperation operation; and
switching from the recuperation readiness mode to the recovery mode as a function of a characteristic variable that is indicative of a degree of cumulative battery stress resulting from charging during recuperation operation;
whereinin said recuperation readiness mode, recuperation operation of said generator, wherein said generator is driven by vehicle kinetic energy and converts said vehicle kinetic energy to electric energy that is stored in said battery, is permitted under predefined conditions;
in said recovery mode, recuperation operation is precluded, and said generator is controlled to charge said battery according to a predetermined charging pattern that at least partially reverses deterioration of the battery which results from stress due to recuperation operation.
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Accused Products
Abstract
A method for regulating a generator in a motor vehicle, in which the generator feeds a vehicle power supply system having loads and having at least one battery, with a regulator regulating the generator output voltage at the value of a nominal value voltage. In a recuperation readiness mode, the nominal value voltage is preset as a function of the driving state variables such that, during braking or when the vehicle is overrunning, electrical power is fed into the vehicle power supply system. Switching takes place between the recuperation readiness mode and a recovery mode as a function of predetermined switching conditions, with the nominal value voltage in the recovery mode being preset such that the battery is regenerated.
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Citations
13 Claims
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1. A method for regulating a generator in a vehicle power supply system including a plurality of loads and at least one battery with a regulator, said method comprising:
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regulating the generator output voltage at the value of a nominal value voltage in one of a recuperation readiness mode and a recovery mode; setting the nominal value voltage in said recuperation readiness mode as a function of driving state variables such that, during braking or when the vehicle is overrunning, the generator and battery are operated in a recuperation operation, in which the generator converts kinetic energy of the vehicle to electric power that is fed into the vehicle power supply system and charges the battery; setting the nominal value voltage (U_nom) in the recovery mode such that the battery is regenerated from degradation due to stress caused by charging during a recuperation operation; and switching from the recuperation readiness mode to the recovery mode as a function of a characteristic variable that is indicative of a degree of cumulative battery stress resulting from charging during recuperation operation;
whereinin said recuperation readiness mode, recuperation operation of said generator, wherein said generator is driven by vehicle kinetic energy and converts said vehicle kinetic energy to electric energy that is stored in said battery, is permitted under predefined conditions; in said recovery mode, recuperation operation is precluded, and said generator is controlled to charge said battery according to a predetermined charging pattern that at least partially reverses deterioration of the battery which results from stress due to recuperation operation. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method of operating a vehicle electrical system that includes a generator connected to a vehicle electrical load and to a vehicle battery, said generator being driven alternatively by a vehicle propulsion device or by kinetic energy of the vehicle, said method comprising:
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operating said system in a recuperation readiness mode; and intermittently switching operation of said system to a recovery mode;
wherein,in said recuperation readiness mode, recuperation operation of said generator, wherein said generator is driven by said vehicle kinetic energy and converts said vehicle kinetic energy to electric energy that is stored in said battery, is permitted under predefined conditions; in said recovery mode, recuperation operation is precluded, and said generator is controlled to charge said battery according to a predetermined charging pattern that at least partially reverses deterioration of the battery which results from stress due to recuperation operation; said step of switching operation of said system to the recovery mode is performed as a function of a characteristic variable that is indicative of a cumulative degree of battery stress resulting from past charging of said battery in said recuperation operation; and said predetermined charging pattern comprises at least one of i) charging said battery to a full state of charge and maintaining said full state of charge for a predetermined time period; and
ii) discharging said battery to a first, severely discharged, state and thereafter charging it to a second, substantially fully charged state. - View Dependent Claims (9, 10, 11, 12, 13)
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Specification