Showing papers on "State of charge published in 1986"

Method of and apparatus for monitoring the state of charge of a rechargeable battery

Abstract: A method of and an apparatus for monitoring the state of charge of a rechargeable battery are disclosed which use a reference value corresponding to a defined state of charge stored in a memory. During each battery charging and discharging cycle, the terminal voltage, the current and time are measured and are converted into energy delivered to the battery or by the battery depending on the direction of current flow. The actual state of charge is then calculated from the reference value stored. The characteristic terminal voltage curve during charging and discharging is used for minimizing the differences between the quantities measured and the actual state of charge of the battery so monitored by monitoring the rate of change in the terminal voltage during the charging and the discharging cycles, by determining, after a phase of a relatively steady and small rate of change in voltage, at least one point at which the rate of change in voltage is higher and by adjusting the actual state of charge determined at this point by coulometry to the predetermined reference value.

Method and apparatus for determining the state of charge of a battery

Abstract: A method of determining the state of charge of a motor vehicle battery 1 in which a stabilization load 2 is applied to the battery 1 after the engine is switched off to accelerate the stabilization of the charge distribution within the battery 1. The stabilization load 2 is applied until the terminal voltage of the battery 1 reaches a level corresponding to a predicted value of the state of charge of the battery 1. After a pre-determined delay of 8 hours or less, the terminal voltage of the battery 1 is measured and the state of charge derived therefrom.

Monitoring state of battery charge

Abstract: In order to monitor continuously the state of charge of a battery, the relaxation voltage of the battery is measured directly, or predicted from measurements taken with no current or only a small current flowing through the battery. From the relaxation voltage, the notional state of charge of the battery, prior to switching on of significant loads or of a charging device, is calculated. During later operation, with the loads and/or charging device in use, the current drawn from or fed to the battery is constantly measured and integrated and the state of charge is continuously estimated from the result of the integration and the notional state measured with the battery previously at rest.

Heart pace maker

Abstract: A the state of charge of the battery characterizing electrical signal controls a pulse generator which generates at least one display pulse (18) at the output of the heart pacemaker, the temporal position with respect to the stimulation pulses (16, 17) depends on the respective charging state of the battery.