Frictional engaging clutch control system for automatic vehicle transmission
First Claim
1. A system for controlling a frictional engaging clutch installed in a transmission which transmits output torque generated by an internal combustion engine mounted on a vehicle to wheels of the vehicle, including:
- judder discriminating means for discriminating whether a vibration which has occurred on the vehicle is a judder; and
judder-decreasing control means for acting to decrease the judder when the judder discriminating means discriminates that the vibration which has occurred on the vehicle is a judder;
wherein the improvement comprising;
the judder discriminating means includes;
frictional engaging clutch rotational speed fluctuation detecting means for detecting an output rotational speed fluctuation of the frictional engaging clutch;
first filter means for transmitting a first range of frequency component of the detected output rotational speed fluctuation of the frictional engaging clutch;
first threshold setting means for setting a first threshold;
first counting means for comparing the first range of frequency component (filtered) with the first threshold to count the number of times (NTEX) at which the first range of frequency component exceeds the first threshold; and
judder determining means for determining that the vibration which has occurred on the vehicle is a judder when the counted number exceeds a reference value.
1 Assignment
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Accused Products
Abstract
A frictional engaging clutch for an automatic vehicle transmission which discriminates judder which has occurred on the vehicle and controls to decrease the same. A clutch slip ratio is calculated, the calculated ratio is then converted into an ac waveform which is filtered by filters similar to a judder filter and a disturbance filter to extract frequency components of an appropriate range, and the number of times (NTEX) at which the filtered waveform peaks exceeds threshold values (appropriately set) is counted, and based on the counts, the judder is discriminated or determined. The configuration is simple and makes it possible to discriminate judder in an automatic vehicle transmission.
27 Citations
19 Claims
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1. A system for controlling a frictional engaging clutch installed in a transmission which transmits output torque generated by an internal combustion engine mounted on a vehicle to wheels of the vehicle, including:
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judder discriminating means for discriminating whether a vibration which has occurred on the vehicle is a judder; and judder-decreasing control means for acting to decrease the judder when the judder discriminating means discriminates that the vibration which has occurred on the vehicle is a judder; wherein the improvement comprising; the judder discriminating means includes; frictional engaging clutch rotational speed fluctuation detecting means for detecting an output rotational speed fluctuation of the frictional engaging clutch; first filter means for transmitting a first range of frequency component of the detected output rotational speed fluctuation of the frictional engaging clutch; first threshold setting means for setting a first threshold; first counting means for comparing the first range of frequency component (filtered) with the first threshold to count the number of times (NTEX) at which the first range of frequency component exceeds the first threshold; and judder determining means for determining that the vibration which has occurred on the vehicle is a judder when the counted number exceeds a reference value. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19)
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Specification