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Method for determining optimal operating point for hybrid electric vehicle

  • US 10,562,515 B2
  • Filed: 05/31/2017
  • Issued: 02/18/2020
  • Est. Priority Date: 11/16/2016
  • Status: Active Grant
First Claim
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1. A method of determining an optimal operating point of a hybrid electric vehicle, the method comprising:

  • determining, by a controller, a demand torque of a driver by collecting vehicle driving information from an acceleration pedal sensor (APS), a brake pedal sensor (BPS), and vehicle state information including a gear stage, a vehicle speed, an engine velocity (rpm), a battery state of charge (SOC);

    comparing, by the controller, the demand torque and an engine torque reference value obtained from an optimal operating line to determine a determined mode, wherein the determined mode is a charging mode or a discharging mode;

    determining, by the controller, a plurality of candidate points in the determined mode, wherein each candidate point comprises a combination of an engine operating point satisfying the demand torque and a motor operating point corresponding to the engine operating point;

    when the determined mode is a charging mode, calculating, by the controller, a system efficiency during charging based on a charging efficiency of each candidate point of the plurality of candidate points and an average discharging efficiency during previous driving;

    when the determined mode is a discharging mode, calculating, by the controller, a system efficiency during discharging based on an average discharging efficiency of each candidate point of the plurality of candidate points and an average charging efficiency during previous driving;

    determining, by the controller, the optimal operating point, wherein the optimal operating point is the candidate point with the highest system efficiency during charging or discharging; and

    controlling, by the controller, an operation of the engine and a motor based on the determined optimal operating point.

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