Patents by Inventor Stephane Cassar
Stephane Cassar has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 11952058Abstract: A method for controlling a steering system of a motor vehicle, including first and second channels in parallel, each including an electric power unit delivering an assist force to the steering system of the vehicle, in order to obtain the sum of two delivered assist forces, corresponding to the total assist force required, the method including: evaluating the channel having the lowest power unit power supply voltage value; defining a master channel function delivering an initial portion of the total assist force requirement and a slave channel function delivering a variable complementary portion of the assist force, corresponding to the difference between the initial portion of force actually delivered and the total force requirement; and pairing the master channel function with the channel having the lowest power unit power supply voltage value, and the slave channel function with the channel having the highest power unit power supply voltage value.Type: GrantFiled: July 9, 2019Date of Patent: April 9, 2024Assignee: JTEKT EUROPEInventors: Stéphane Cassar, Bruno Collerais, Giovanni Dallara
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Publication number: 20210261189Abstract: A method for controlling a steering system of a motor vehicle, including first and second channels in parallel, each including an electric power unit delivering an assist force to the steering system of the vehicle, in order to obtain the sum of two delivered assist forces, corresponding to the total assist force required, the method including: evaluating the channel having the lowest power unit power supply voltage value; defining a master channel function delivering an initial portion of the total assist force requirement and a slave channel function delivering a variable complementary portion of the assist force, corresponding to the difference between the initial portion of force actually delivered and the total force requirement; and pairing the master channel function with the channel having the lowest power unit power supply voltage value, and the slave channel function with the channel having the highest power unit power supply voltage value.Type: ApplicationFiled: July 9, 2019Publication date: August 26, 2021Applicant: JTEKT EUROPEInventors: Stéphane CASSAR, Bruno COLLERAIS, Giovanni DALLARA
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Publication number: 20210086824Abstract: A method for controlling a steering system of a motor vehicle, including two channels arranged in parallel and each including an electric drive delivering an assistive force for assisting in the steering of the vehicle, so as to obtain a sum of the two delivered assistive forces that corresponds to a total requested assistive force requirement, this method being noteworthy in that a first channel delivers a first portion of the total assistive force requirement, and in that the second channel delivers a variable complementary assistive force portion, corresponding to the difference between the estimated or measured first force portion that is actually delivered and the total force requirement.Type: ApplicationFiled: December 6, 2018Publication date: March 25, 2021Applicant: JTEKT EUROPEInventors: Stéphane CASSAR, Bruno COLLERAIS, Giovanni DALLARA
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Patent number: 10427691Abstract: The invention concerns a method for determining the direction of longitudinal travel of a vehicle comprising a step (a) of collecting a first signal (Signal1), representative of a first driving parameter, such as the steering-wheel torque, and of which the sign of the value and/or the sign of the variations is not dependent on the direction of longitudinal travel of the vehicle, a step (b) of collecting a second signal (Signal2), representative of a second driving parameter separate from the first driving parameter, such as the yaw rate, and of which the sign of the value and/or the sign of the variations changes on the basis of the direction of longitudinal travel of the vehicle, then a step (c) of comparing signs during which the sign of the value, or of the variation, of the first signal (Signal1) is compared with the sign of the value, or of the variation, of the second signal (Signal2) in order to deduce therefrom the direction of longitudinal travel of the vehicle, depending on whether said signs are idType: GrantFiled: July 3, 2013Date of Patent: October 1, 2019Assignee: JTEKT EUROPEInventors: Stephane Cassar, Romain Moretti, Luc Leydier
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Publication number: 20150158496Abstract: The invention concerns a method for determining the direction of longitudinal travel of a vehicle comprising a step (a) of collecting a first signal (Signal1), representative of a first driving parameter, such as the steering-wheel torque, and of which the sign of the value and/or the sign of the variations is not dependent on the direction of longitudinal travel of the vehicle, a step (b) of collecting a second signal (Signal2), representative of a second driving parameter separate from the first driving parameter, such as the yaw rate, and of which the sign of the value and/or the sign of the variations changes on the basis of the direction of longitudinal travel of the vehicle, then a step (c) of comparing signs during which the sign of the value, or of the variation, of the first signal (Signal1) is compared with the sign of the value, or of the variation, of the second signal (Signal2) in order to deduce therefrom the direction of longitudinal travel of the vehicle, depending on whether said signs are idType: ApplicationFiled: July 3, 2013Publication date: June 11, 2015Inventors: Stephane Cassar, Romain Moretti, Luc Leydier
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Patent number: 8731776Abstract: The processing means, which control the power assisted steering motor (8), determine and give consideration to a first steering angle signal (A) determined as a function of the calculation or measurement of the force or torque delivered by the power assisted steering motor (8) and possibly of the steering torque or force applied by the driver to the steering wheel (2), a second steering angle signal (B) determined as a function of the calculation of the measurement of the angular position of the power assisted steering motor (8), a third signal (C) of the “index” type, that is to say of the type emitted for certain angular positions of the steering system (21), a convergence signal (D) indicative of the convergence of the steering angle calculations, and a confirmation signal (E) confirming the calculation of the steering angle, the convergence signal (D) being produced thanks to the signal (C) of “index” type to indicate a confidence level on the estimated steering angle value.Type: GrantFiled: June 23, 2009Date of Patent: May 20, 2014Assignee: Jtekt EuropeInventors: Stephane Cassar, Sebastien Herault, Jean-Marc Kasbarian, Pierre Pilaz, Pascal Moulaire
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Patent number: 8725352Abstract: The invention relates to a power assisted steering system (21) that includes an electric assist motor (22) arranged to assist the manual force exerted by a driver on the steering wheel of the automobile, a processing means (23) arranged to control the electric assist motor (22), the processing means (23) including a means (28) for predetermining a signal (S3) for controlling the electric assist motor on the basis of a first operation signal (S1) determined on the basis of the angular position of the electric assist motor, and a second operation signal (S2) determined on the basis of the measurement or calculation of the angular acceleration of the electric assist motor and the measurement or calculation of the assistance torque output by the electric assist motor.Type: GrantFiled: July 16, 2009Date of Patent: May 13, 2014Assignee: JTEKT EuropeInventors: Pierre Pilaz, Stephane Cassar, Pascal Moulaire
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Patent number: 8666606Abstract: The steering system of the invention includes a processing means (26) comprising a means for determining (30) a driving signal (S3) of the power means (25) on the basis of: a first control signal (S1) determined from the measure of a torque applied by the driver on the steering wheel by applying a gain that depends on the longitudinal speed of the vehicle; a second correction signal (S2) determined from the measure of the torque applied by the driver on the steering wheel, and a setpoint determined on the basis of at least one characteristic parameter of the lateral dynamics of the vehicle.Type: GrantFiled: July 10, 2008Date of Patent: March 4, 2014Assignee: JTEKT EuropeInventors: Stephane Cassar, Jean-Marc Kasbarian
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Patent number: 8447470Abstract: The invention concerns a method which includes: filtering the torque signal using a low-pass filter of the first order at a variable cut-off frequency which takes on, respectively, a minimum value or a maximum value depending on whether the amplitude of the torque signal is, respectively, lower or higher than a predetermined threshold; then in producing a signal indicating, respectively, a steering wheel release or a steering wheel grip depending on whether the amplitude of the filtered torque signal is, respectively, lower or higher than a predetermined threshold.Type: GrantFiled: September 28, 2006Date of Patent: May 21, 2013Assignee: JTEKT EuropeInventors: Julien Barthomeuf, Stephane Cassar
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Publication number: 20110257844Abstract: The processing means, which control the power assisted steering motor (8), determine and give consideration to a first steering angle signal (A) determined as a function of the calculation or measurement of the force or torque delivered by the power assisted steering motor (8) and possibly of the steering torque or force applied by the driver to the steering wheel (2), a second steering angle signal (B) determined as a function of the calculation of the measurement of the angular position of the power assisted steering motor (8), a third signal (C) of the “index” type, that is to say of the type emitted for certain angular positions of the steering system (21), a convergence signal (D) indicative of the convergence of the steering angle calculations, and a confirmation signal (E) confirming the calculation of the steering angle, the convergence signal (D) being produced thanks to the signal (C) of “index” type to indicate a confidence level on the estimated steering angle value.Type: ApplicationFiled: June 23, 2009Publication date: October 20, 2011Applicant: JTEKT EUROPEInventors: Stephane Cassar, Sebastien Herault, Jean-Marc Kasbarian, Pierre Pilaz, Pascal Moulaire
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Publication number: 20110184609Abstract: The invention relates to a power assisted steering system (21) that includes an electric assist motor (22) arranged to assist the manual force exerted by a driver on the steering wheel of the automobile, a processing means (23) arranged to control the electric assist motor (22), the processing means (23) including a means (28) for predetermining a signal (S3) for controlling the electric assist motor on the basis of a first operation signal (S1) determined on the basis of the angular position of the electric assist motor, and a second operation signal (S2) determined on the basis of the measurement or calculation of the angular acceleration of the electric assist motor and the measurement or calculation of the assistance torque output by the electric assist motor.Type: ApplicationFiled: July 16, 2009Publication date: July 28, 2011Applicant: JTEKT EUROPEInventors: Pierre Pilaz, Stephane Cassar, Pascal Moulaire
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Publication number: 20110035110Abstract: The steering system of the invention includes a processing means (26) comprising a means for determining (30) a driving signal (S3) of the power means (25) on the basis of: a first control signal (S1) determined from the measure of a torque applied by the driver on the steering wheel by applying a gain that depends on the longitudinal speed of the vehicle; a second correction signal (S2) determined from the measure of the torque applied by the driver on the steering wheel, and a setpoint determined on the basis of at least one characteristic parameter of the lateral dynamics of the vehicle.Type: ApplicationFiled: July 10, 2008Publication date: February 10, 2011Applicant: JTEKT EUROPEInventors: Stephane Cassar, Jean-Marc Kasbarian
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Patent number: 7555402Abstract: The method consists in: determining in which actually sector the booster motor is located, a sector of the booster motor being defied by two successive poles; determining a relative angle position of the steering wheel in relation to the booster motor; identifying a sector, known as neutral, in which the booster motor is located when the rotation speeds of the rear wheels, i.e. right and left of the vehicle, are equal; determining an angle offset of the steering wheel corresponding to a neutral angle position of the steering wheel; determining an absolute angle position of the steering wheel which is equal to the difference between the relative angle position of the steering wheel and the offset angle thereof.Type: GrantFiled: September 16, 2005Date of Patent: June 30, 2009Assignee: JTEKT EuropeInventors: Julien Barthomeuf, Stephane Cassar, Andre Michelis
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Publication number: 20090069981Abstract: The invention concerns a method which includes: filtering the torque signal using a low-pass filter of the first order at a variable cut-off frequency which takes on, respectively, a minimum value or a maximum value depending on whether the amplitude of the torque signal is, respectively, lower or higher than a predetermined threshold; then in producing a signal indicating, respectively, a steering wheel release or a steering wheel grip depending on whether the amplitude of the filtered torque signal is, respectively, lower or higher than a predetermined threshold.Type: ApplicationFiled: September 28, 2006Publication date: March 12, 2009Applicant: JTEKT EUROPEInventors: Julien BARTHOMEUF, Stephane CASSAR
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Publication number: 20080140340Abstract: The method consists in: determining in which actually sector the booster motor is located, a sector of the booster motor being defied by two successive poles; determining a relative angle position of the steering wheel in relation to the booster motor; identifying a sector, known as neutral, in which the booster motor is located when the rotation speeds of the rear wheels, i.e. right and left of the vehicle, are equal; determining an angle offset of the steering wheel corresponding to a neutral angle position of the steering wheel; determining an absolute angle position of the steering wheel which is equal to the difference between the relative angle position of the steering wheel and the offset angle thereof.Type: ApplicationFiled: September 16, 2005Publication date: June 12, 2008Applicant: KOYO STEERING EUROPE (K.S.E.)Inventors: Julien Barthomeuf, Stephane Cassar, Andre Michelis