Method of improving steering performance robustness utilizing mass non-uniformity in tire/wheel
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
E01C-023/00
G01M-019/00
출원번호
US-0901434
(2001-07-09)
발명자
/ 주소
Kunsch, Romain
Koeune, Thierry
Michel, Edouard
Croissant, Bernard
출원인 / 주소
The Goodyear Tire & Rubber Company
대리인 / 주소
Cohn, Howard M.
인용정보
피인용 횟수 :
3인용 특허 :
23
초록▼
The invention relates to methods for improving vehicle steering performance and robustness of that performance through control of non-uniformities in the vehicle's tires, wheels and tire/wheel assemblies as a way to overcome the tendency of many vehicle types to undergo "steering performance loss."
The invention relates to methods for improving vehicle steering performance and robustness of that performance through control of non-uniformities in the vehicle's tires, wheels and tire/wheel assemblies as a way to overcome the tendency of many vehicle types to undergo "steering performance loss." While minimizing lateral force variations (e.g., couple imbalance), a controlled amount of radial and/or tangential force variation is induced in one or more tire/wheel assemblies by means of mass non-uniformity, dimensional non-uniformity, and/or stiffness non-uniformity. For mass non-uniformity, the preferred method includes imparting a controlled amount of excess mass to tires, especially in the tread region, by means, for example, of a heavy splice, an extra fabric piece, or a sector of a tire component having excess mass. The excess mass is meridionally symmetric so as to induce static but not couple imbalance, thereby imparting a "residual static imbalance" (RSI) to the tire. Beneficial tangential and/or radial force variations will result in the use of such a tire, even if the tire/wheel assembly is balanced by weights added to the wheel. A method of determining steering performance robustness for a vehicle/wheel/tire construction combination comprises conducting a series of steering performance tests of the vehicle, wherein at least one of the tire/wheel assemblies has its balance condition changed for each test through a progression of values from values favorable to steering performance (e.g., RSI), through neutral values (balanced), to values unfavorable to steering performance (e.g., couple imbalance).
대표청구항▼
The invention relates to methods for improving vehicle steering performance and robustness of that performance through control of non-uniformities in the vehicle's tires, wheels and tire/wheel assemblies as a way to overcome the tendency of many vehicle types to undergo "steering performance loss."
The invention relates to methods for improving vehicle steering performance and robustness of that performance through control of non-uniformities in the vehicle's tires, wheels and tire/wheel assemblies as a way to overcome the tendency of many vehicle types to undergo "steering performance loss." While minimizing lateral force variations (e.g., couple imbalance), a controlled amount of radial and/or tangential force variation is induced in one or more tire/wheel assemblies by means of mass non-uniformity, dimensional non-uniformity, and/or stiffness non-uniformity. For mass non-uniformity, the preferred method includes imparting a controlled amount of excess mass to tires, especially in the tread region, by means, for example, of a heavy splice, an extra fabric piece, or a sector of a tire component having excess mass. The excess mass is meridionally symmetric so as to induce static but not couple imbalance, thereby imparting a "residual static imbalance" (RSI) to the tire. Beneficial tangential and/or radial force variations will result in the use of such a tire, even if the tire/wheel assembly is balanced by weights added to the wheel. A method of determining steering performance robustness for a vehicle/wheel/tire construction combination comprises conducting a series of steering performance tests of the vehicle, wherein at least one of the tire/wheel assemblies has its balance condition changed for each test through a progression of values from values favorable to steering performance (e.g., RSI), through neutral values (balanced), to values unfavorable to steering performance (e.g., couple imbalance). m value and a minimum value of an air flow signal value obtained by said thermal resistor. 2. A thermal resistor type air flow measuring apparatus of claim 1, wherein a correcting means for correcting said air flow signal in the event that said judging means judges an existence of a reverse flow. 3. A thermal resistor type air flow measuring apparatus of claim 2, wherein said correction means corrects serially a detected waveform at every sampling of data and increments a mean air flow for a single period of pulsation. 4. A thermal resistor type air flow measuring apparatus of claim 3 wherein a correction is not performed in case that a air flow change about 10% or more occurs for a corrected value in a previous time. 5. A thermal resistor type air flow measuring apparatus of claim 2, wherein said correction means decreases a correction quantity near one of a maximum value and a minimum value of a detected waveform, and increases a correction quantity as close to another one. 6. A thermal resistor type air flow measuring apparatus of claim 5 wherein a correction for reducing a mean air flow for a single cycle of an intake stroke of said internal combustion engine is made by means that a correction quantity near a minimum value of said detected waveform is made smaller, and a correction quantity as closer to a maximum value is made larger, and a pulsation amplitude is made smaller. 7. A thermal resistor type air flow measuring apparatus of claim 2, further comprising means for obtaining said maximum value and said minimum value from air flow signal values in a designated time period which exceeds a period of an idle rotational speed of said internal combustion engine. 8. A thermal resistor type air flow measuring apparatus of claim 2, further comprising a means for obtaining said maximum value and said minimum value from air flow signal values in a designated time period changeable in response to an intake stroke period of said internal combustion engine. 9. A thermal resistor type air flow measuring apparatus of claim 2, wherein said judging means judges the existence of a reverse flow based on a value F, where F=said maximum value-said minimum value)/((said maximum value+said minimum value)/2). 10. A thermal resistor type air flow measuring apparatus of claim 1, further comprising means for obtaining said maximum value and said minimum value from air flow signal values in a designated time period which exceeds a period of an idle rotational speed of said internal combustion engine. 11. A thermal resistor type air flow measuring apparatus of claim 1, further comprising a means for obtaining said maximum value and said minimum value from air flow signal values in a designated time period, wherein changeable in response to an intake stroke period of said internal combustion engine. 12. A thermal resistor type air flow measuring apparatus of claim 1, wherein said judging means judges the existence of a reverse flow based on a value F, where F=said maximum value-said minimum value)/((said maximum value+said minimum value)/2). 13. A control apparatus for an internal combustion engines, comprising a thermal resistor type air flow measuring apparatus of claim 1; and a control apparatus for controlling a quantity of fuel supplied to said internal combustion engine based on a signal from said thermal resistor type air flow measuring apparatus. 14. A thermal resistor type air flow measuring apparatus, comprising an auxiliary air passage arrangeable in an intake air passage of an internal combustion engine and having at least one bend; a thermal resistor placed in said auxiliary air passage; and a correcting means for correcting a measurement error due to a reverse flow generated in said intake air passage based on a maximum value and a minimum value of an air flow signal value obtained by said thermal resistor. 15. A thermal resistor type air flow measuring apparatus
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