Vehicle state analysis system and its analysis method
AssigneeMiyama, Inc.
InventorsSatoshi Kumagai, Takao Hamuro, Hideki Nagahara
Life of this patent
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Abstract
An engine performance map which specifies the relation between running conditions and brake specific fuel consumption (BSFC) is generated by estimating the BSFC relative to the engine rotation speed and accelerator depression amount, based on the BSFC characteristics predicted from the torque pattern of the vehicle being analyzed and the optimum BSFC. A vehicle mounted unit 1 computes the BSFC of the engine by looking up the engine performance map based on the engine rotation speed and accelerator depression amount, and computes the fuel consumption rate based on this BSFC.
Claims15
A vehicle state analysis system for a vehicle with an engine, comprising:
- means for estimating a brake specific fuel consumption under remaining running conditions based on generic brake specific fuel consumption characteristic data and a known actual brake specific fuel consumption under a certain running condition of the engine, and for generating an engine performance map which specifies the relation between the running conditions and the brake specific fuel consumption,
- means for computing the brake specific fuel consumption of the engine by looking up the engine performance map based on the running conditions of the vehicle being analyzed,
- means for computing a fuel consumption amount from the computed brake specific fuel consumption and engine output, and
- means for computing the fuel consumption rate from the computed fuel consumption amount and vehicle running distance.
A vehicle state analysis method for a vehicle with an engine, comprises the steps of:
- estimating a brake specific fuel consumption under remaining running conditions based on generic brake specific fuel consumption characteristic data and a known actual brake specific fuel consumption under a certain running condition of the engine, and then generating an engine performance map which specifies the relation between the running conditions and the brake specific fuel consumption,
- computing the brake specific fuel consumption of the engine by looking up the engine performance map based on the running conditions of the vehicle being analyzed,
- computing a fuel consumption amount from the computed brake specific fuel consumption and engine output, and
- computing the fuel consumption rate from the computed fuel consumption amount and vehicle running distance.
Dependencies are inferred from the claim text.