System for controlling brake pulsing at vehicle natural vibration frequencies
First Claim
1. In a vehicle having a powertrain and an anti-lock braking system (ABS), a method of controlling the ABS, comprising:
- accumulating responses of the ABS to a series of sudden braking events;
correlating the ABS responses to one or more natural vibration frequencies of the vehicle; and
,selecting an ABS response to a brake request based on the correlated ABS responses in order to avoid exciting the powertrain at the one or more natural vibration frequencies, wherein the selecting step includes selecting a nominal ABS response and altering the nominal ABS response by either delaying the nominal ABS response for a selected period of time, or accelerating the nominal ABS response.
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Accused Products
Abstract
A system is provided for controlling automatic brake systems to avoid pulsing vehicle brakes at certain natural vibration frequencies of the vehicle'"'"'s mechanical systems such as a powertrain and driveline. The natural vibration frequencies of the vehicle'"'"'s systems are determined and correlated with a range of possible braking regimes implemented by an on-board automatic brake control, such as an anti-lock braking (ABS) system. A proposed, normally appropriate ABS braking response to a sudden braking condition is either modified, accelerated or delayed when the proposed response is deemed likely to excite a vehicle natural frequency. The system improves ABS operation in vehicles having high effective inertia powertrains, such as those used in hybrid electric vehicles.
12 Citations
19 Claims
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1. In a vehicle having a powertrain and an anti-lock braking system (ABS), a method of controlling the ABS, comprising:
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accumulating responses of the ABS to a series of sudden braking events; correlating the ABS responses to one or more natural vibration frequencies of the vehicle; and
,selecting an ABS response to a brake request based on the correlated ABS responses in order to avoid exciting the powertrain at the one or more natural vibration frequencies, wherein the selecting step includes selecting a nominal ABS response and altering the nominal ABS response by either delaying the nominal ABS response for a selected period of time, or accelerating the nominal ABS response. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling an anti-lock braking system (ABS) to avoid exciting a natural vibration frequency of a vehicle, comprising:
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determining the response of the ABS to a series of sudden braking events; developing a set of vehicle natural vibration frequencies that may be excited by the ABS using the response of the ABS to the series of braking events; selecting an ABS response to a driving event requiring actuation of the ABS; determining whether the selected ABS response may excite any of the frequencies in the developed set; and altering the selected ABS response to avoid exciting any of the frequencies in the developed set. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A system for controlling an anti-lock braking system (ABS) to avoid exciting a natural vibration frequency of a vehicle, comprising;
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computer memory having a stored set of ABS responses to past sudden braking events requiring actuation of the vehicle'"'"'s ABS; and
,a set of programmed instructions for comparing a proposed ABS response with the ABS responses stored in the memory, wherein the programmed instructions include instructions for accelerating the proposed ABS response, delaying the nominal ABS response for a selected period of time, or altering the rate at which the brakes are pulsed and for altering the proposed response based on the comparison to avoid an ABS response that may excite a vehicle natural vibration frequency. - View Dependent Claims (14)
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15. A method of controlling an anti-lock braking system (ABS) to avoid exciting a natural vibration frequency of a vehicle, comprising:
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storing responses of the ABS to a series of past sudden braking events that resulted in exciting a vehicle natural vibration frequency, monitoring the response of the ABS to a series of braking events, wherein the monitoring step includes accumulating and recording brake pressures and brake pulsing frequencies; selecting a proposed ABS response to a driving event requiring actuation of the ADS; and
,altering the proposed ABS response based on the stored ABS responses to avoid an ABS response that may excite a vehicle natural vibration frequency. - View Dependent Claims (16, 17, 18, 19)
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Specification