Telematics-based method and system of battery parasitic load validation for a vehicle fleet
First Claim
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1. A process for evaluating parasitic load on an electrical storage battery of a vehicle having an engine and an on-board electrical storage battery, said vehicle operative in alternating engine-on and engine-off states, comprising:
- for each of a plurality of engine-off states to obtain a plurality of equations;
determining a first estimate of the state of charge of the battery at a first time substantially just prior to the beginning of an engine-off state or during said engine-off state;
determining a second estimate of the state of charge of the battery at a second time during said engine-off state subsequent to the first estimate of the state of charge determination;
determining an elapsed time between said first time and said second time; and
determining an estimate of the parasitic load of the battery based on the difference between the first and second estimates of state of charge of the battery and said elapsed time;
each equation having the form;
δ
=(Soff−
Son)×
C=P×
T+ε
in which Soff is the respective estimate of the state of charge of the battery substantially contemporaneous with the beginning of an engine-off state, and Son is the respective estimate of the state of charge of the battery substantially just prior to the beginning of the engine-on state that immediately follows the engine-off state, C is the battery reserved capacity in ampere*hours, P is the estimated parasitic load, T is an elapsed time between Soff and Son, δ
is state of charge loss of the battery during the elapsed time T, and ε
is a constant, so as to provide a set of linear equations of the form;
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Abstract
Parasitic loads on a vehicular battery are evaluated based on an estimated reduction in the state of charge of the battery over the course of an engine-off state.
10 Citations
16 Claims
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1. A process for evaluating parasitic load on an electrical storage battery of a vehicle having an engine and an on-board electrical storage battery, said vehicle operative in alternating engine-on and engine-off states, comprising:
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for each of a plurality of engine-off states to obtain a plurality of equations; determining a first estimate of the state of charge of the battery at a first time substantially just prior to the beginning of an engine-off state or during said engine-off state; determining a second estimate of the state of charge of the battery at a second time during said engine-off state subsequent to the first estimate of the state of charge determination; determining an elapsed time between said first time and said second time; and determining an estimate of the parasitic load of the battery based on the difference between the first and second estimates of state of charge of the battery and said elapsed time; each equation having the form;
δ
=(Soff−
Son)×
C=P×
T+εin which Soff is the respective estimate of the state of charge of the battery substantially contemporaneous with the beginning of an engine-off state, and Son is the respective estimate of the state of charge of the battery substantially just prior to the beginning of the engine-on state that immediately follows the engine-off state, C is the battery reserved capacity in ampere*hours, P is the estimated parasitic load, T is an elapsed time between Soff and Son, δ
is state of charge loss of the battery during the elapsed time T, and ε
is a constant, so as to provide a set of linear equations of the form; - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for evaluating parasitic load on an electrical storage battery of a vehicle having an engine and an on-board electrical storage battery, said vehicle operative in alternating engine-on and engine-off states, comprising:
-
for each of a plurality of engine-off states to obtain a plurality of equations; determining a first estimate of the state of charge of the battery at a first time substantially just prior to the beginning of an engine-off state or during said engine-off state; determining a second estimate of the state of charge of the battery at a second time during said engine-off state subsequent to the first estimate of the state of charge determination; and determining an estimate of the parasitic load of the battery based on the difference between the first and second estimates of state of charge of the battery and the elapsed time, wherein said elapsed time represents a difference between said first time and said second time; each equation having the form;
δ
=(Soff−
Son)×
C=P×
T+εin which wherein Soff is the respective estimate of the state of charge of the battery substantially contemporaneous with the beginning of an engine-off state, and Son is the respective estimate of the state of charge of the battery substantially just prior to the beginning of the engine-on state that immediately follows the engine-off state, C is the battery reserved capacity in ampere*hours, P is the estimated parasitic load, T is an elapsed time between Soff and Son,δ
is state of charge loss of the battery during the elapsed time T, and ε
is a constant, so as to provide a set of linear equations of the form; - View Dependent Claims (9, 10, 11, 12)
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13. A process for evaluating parasitic load on an electrical storage battery of a vehicle having an engine and an on-board electrical storage battery, said vehicle operative in alternating engine-on and engine-off states, comprising:
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for each of a plurality of vehicles; measuring a plurality of vehicle parameters during engine-on and engine-off states; wirelessly transmitting said plurality of vehicle parameters from said vehicle to computer memory that is remotely-located with respect to said vehicle; remotely determining an estimate of the parasitic load on the battery based on the wirelessly transmitted plurality of vehicle parameters; and wherein the estimate of the parasitic load on the battery is determined based upon;
(1) a difference between a first estimate of a state of charge of the battery at a first time substantially contemporaneously with the beginning of one of the engine off-states and a second estimate of a state of charge of the battery at a second time subsequent just prior to the beginning of the engine on-state that immediately follows said prior engine-off state, and (2) an elapsed time between said first and second times;wherein remotely determining an estimate of the parasitic load on the battery based on the wirelessly transmitted plurality of vehicle parameters comprises; formatting the respective wirelessly transmitted plurality of vehicle parameters into a plurality of eciuations, each having the form;
δ
=(Soff−
Son)×
C=P×
T+εin which Soff is the respective estimate of the state of charge of the battery substantially contemporaneous with the beginning of an engine-off state, and Son is the respective estimate of the state of charge of the battery substantially just prior to the beginning of the engine-on state that immediately follows the engine-off state, C is the battery reserved capacity in ampere*hours, P is the estimated parasitic load, T is an elapsed time between Soff and Son, δ
is state of charge loss of the battery during the elapsed time T, and ε
is a constant, so as to provide a set of linear equations of the form; - View Dependent Claims (14, 15, 16)
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Specification