Monitoring and control system for an electrical storage system of a vehicle

• US 8,330,412 B2
• Filed: 07/31/2009
• Issued: 12/11/2012
• Est. Priority Date: 07/31/2009
• Status: Active Grant

• Current Assignee: Thermo King Corporation (Trane Technologies plc)
• Original Assignee: Thermo King Corporation (Trane Technologies plc)
• Inventors: Lattin, Robert M.
• Primary Examiner(s): Williams, Arun
• Application Number:
  US12/534,005
• Publication Number:
  US 20110025273A1
• Time in Patent Office: 1,229 Days
• Field of Search: 320/104
• US Class Current: 320/104
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: G01R 31/3842 combining voltage and current measurements
• CPC Class Codes: H01M 10/48 Accumulators combined with arrangements for measuring, testing or indicating the condition of cells, e.g. the level or density of the electrolyte constructional details of current conducting connections for detecting conditions inside cells or batteries, e.g. details of voltage sensing terminals, H01M50/569
• CPC Class Codes: Y02E 60/10 Energy storage using batteries

Abstract

A method of monitoring an electrical storage system. The method includes providing an electrical storage element defining a total storage capacity and having a state of charge cooperatively defining a total stored charge of the electrical storage element, determining a total stored charge value representative of the total stored charge of the electrical storage element, varying the total stored charge by charging the electrical storage element from the power source via an electrical charge or discharging the electrical storage element to the load via an electrical discharge, and updating the total stored charge value after varying the total stored charge.

Claims

1. A method of monitoring an electrical storage system for a vehicle having a power source and a load, the method comprising:

providing an electrical storage element defining a total storage capacity and having a state of charge cooperatively defining a total stored charge of the electrical storage element;

determining a total stored charge value representative of the total stored charge of the electrical storage element;

determining a run-time of the load based on the total stored charge value;

varying the total stored charge by charging the electrical storage element from the power source via an electrical charge or discharging the electrical storage element to the load via an electrical discharge;

updating the total stored charge value after varying the total stored charge based on a measured quantity of at least one of the electrical charge and the electrical discharge;

updating the run-time based on the updated total stored charge value;

determining an average voltage of the electrical storage element over a first predetermined time;

determining a voltage change of the electrical storage element over a second predetermined time;

verifying the run time based on at least one of the average voltage and the voltage change;

comparing the voltage change of the electrical storage element to a first threshold;

determining a first predictive total stored charge value representative of the total stored charge of the electrical storage element based on the comparison of the voltage change to the first threshold;

comparing the voltage average to a second threshold;

determining a second predictive total stored charge value of the total stored charge of the electrical storage element based on the comparison of the voltage average to the second threshold; and

updating the total stored charge value based on one of the first predictive total stored charge value and the second predictive total stored charge value in response to one of the voltage change and the voltage average exceeding the respective first and second thresholds.

2. The method of claim 1, further comprising

determining whether the electrical storage element is in one of a charge phase and a discharge phase;

determining at least one of a charging condition associated with the charge phase and a discharging condition associated with the discharge phase; and

updating the total stored charge value of the electric storage element based on the charging condition.

3. The method of claim 2, wherein updating the total stored charge value includes accounting for at least one of environment conditions adjacent the electrical storage element and an age of the electrical storage element.

4. The method of claim 1, further comprising generating an alarm when the run-time drops below a predetermined threshold.