PACCAR has been granted a patent for a diagnostic method to identify misfire conditions in individual engine cylinders of turbocharged diesel engines. The method involves using pressure and crankshaft position sensors to analyze pressure values and select diagnosing tests. The invention aims to improve engine performance and reliability. GlobalData’s report on PACCAR gives a 360-degree view of the company including its patenting strategy. Buy the report here.
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According to GlobalData’s company profile on PACCAR, Driving behavior monitoring was a key innovation area identified from patents. PACCAR's grant share as of May 2024 was 68%. Grant share is based on the ratio of number of grants to total number of patents.
Diagnostic method for misfire condition in turbocharged diesel engine
A recently granted patent (Publication Number: US12013311B2) discloses a diagnostic method for identifying misfire conditions in individual engine cylinders of a turbocharged diesel engine. The method involves using pressure sensors to measure pressure values in the exhaust path of the cylinders, a crankshaft position sensor to detect rotational position, and a processor unit to analyze the data. By obtaining subsequent pressure values as a function of crankshaft angle position, the processor unit selects a diagnosing test based on these values. The method includes various diagnosing functions, with more than 7 functions in the group, and a limited number of sampling pressure values to ensure accuracy.
Furthermore, the patent details the formation of diagnosing functions by combining basic functions such as single sample characteristics, delta pressure characteristics, mean pressure characteristics, and others. A threshold is determined from a calibration set to diagnose a misfire condition based on the function's deviation from the threshold. The method also considers factors like engine speed, load, and cylinder position when selecting sampling values. Additionally, the patent describes the use of pressure sensors, crankshaft position sensors, and camshaft angle detectors to enhance the accuracy of diagnosing misfire conditions in the engine cylinders. The method aims to improve diagnostic accuracy by considering various parameters and characteristics of the engine operation.
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