Patents by Inventor Mats Skold
Mats Skold 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: 11511746Abstract: The invention relates to a method for a follower vehicle (2) following a lead vehicle, comprising—determining a position (PL) and a heading (HL) of the lead vehicle (1), —determining a position (PF) and a heading (HF) of the follower vehicle (2), —subsequently establishing a path for the follower vehicle (2) by fitting a curve (C1) to said positions (PL, PF) and said headings (HL, HF), —and controlling the follower vehicle (2) so as to move along the established path.Type: GrantFiled: May 11, 2018Date of Patent: November 29, 2022Assignee: Volvo Truck CorporationInventors: Wilhelm Wiberg, Stefan Bergquist, Edvin Valtersson, Mats Sköld
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Patent number: 11505190Abstract: A method for a follower vehicle following a lead vehicle, comprising establishing, in a first control mode of the follower vehicle, a path for the follower vehicle to follow the lead vehicle, characterized by generating environmental data which is related to the environment of the lead vehicle, determining, based on the generated environmental data, an expected behaviour of an operational parameter of the lead vehicle, determining an actual behaviour of the lead vehicle operational parameter, comparing the determined expected behaviour of the lead vehicle operational parameter and the determined actual behaviour of the lead vehicle operational parameter, determining based on said comparison whether to continue in first control mode of the follower vehicle, or in a second control mode of the follower vehicle, differing from the first control mode.Type: GrantFiled: November 1, 2018Date of Patent: November 22, 2022Assignee: Volvo Truck CorporationInventors: Wilhelm Wiberg, Stefan Bergquist, Edvin Valtersson, Mats Sköld
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Publication number: 20210213949Abstract: The invention relates to a method for a follower vehicle (2) following a lead vehicle, comprising—determining a position (PL) and a heading (HL) of the lead vehicle (1),—determining a position (PF) and a heading (HF) of the follower vehicle (2),—subsequently establishing a path for the follower vehicle (2) by fitting a curve (C1) to said positions (PL, PF) and said headings (HL, HF),—and controlling the follower vehicle (2) so as to move along the established path.Type: ApplicationFiled: May 11, 2018Publication date: July 15, 2021Inventors: Wilhelm Wiberg, Stefan Bergquist, Edvin Valtersson, Mats Sköld
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Publication number: 20210163004Abstract: The invention relates to a method for a follower vehicle following a lead vehicle (1), comprising establishing, in a first control mode of the follower vehicle (2), a path for the follower vehicle (2) to follow the lead vehicle (1), characterized by —generating environmental data (SL) which is related to the environment of the lead vehicle (1), —determining, based on the generated environmental data, an expected behaviour (NAP, NSP) of an operational parameter of the lead vehicle (1), —determining an actual behaviour (AA, AS) of the lead vehicle operational parameter, —comparing the determined expected behaviour (NAP, NSP) of the lead vehicle operational parameter and the determined actual behaviour of the lead vehicle operational parameter, —determining based on said comparison whether to continue in first control mode of the follower vehicle (2), or in a second control mode of the follower vehicle, differing from the first control mode.Type: ApplicationFiled: November 1, 2018Publication date: June 3, 2021Inventors: Wilhelm Wiberg, Stefan Bergquist, Edvin Valtersson, Mats Sköld
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Patent number: 10775294Abstract: A method is described for determining a friction estimate between a road surface and a tire of a vehicle, the tire being arranged on a steerable wheel of the vehicle, and the vehicle having an axle rack pivotably attached to a linkage arm connected to the steerable wheel such that a translational motion of the axle rack causes the linkage arm to rotate about a kingpin element such that the linkage arm causes a turning motion of the steerable wheel. The method includes acquiring a plurality of rack force values; acquiring a plurality of lateral wheel force values; mapping a relation between the plurality of rack force values and the lateral wheel force values to a model; and determining the lateral friction estimate based on the mapping.Type: GrantFiled: October 6, 2017Date of Patent: September 15, 2020Assignee: VOLVO CAR CORPORATIONInventors: Mats Skold, Tony Gustafsson, Henrik Gullven
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Patent number: 10710597Abstract: A method is described for computing a friction estimate between a road surface and a tire of a vehicle when the vehicle is in motion along a course, the tire being arranged on a steerable wheel of the vehicle, and the vehicle including two front wheels and two rear wheels and an axle rack pivotably attached to a linkage arm connected to the steerable wheel such that a translational motion of the axle rack causes the linkage arm to rotate about a kingpin element such that the linkage arm causes a turning motion of the steerable wheel. A corresponding system and vehicle are also described.Type: GrantFiled: October 6, 2017Date of Patent: July 14, 2020Assignee: VOLVO CAR CORPORATIONInventors: Mats Skold, Mats Jonasson
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Patent number: 10703406Abstract: A method in a vehicle for determining road properties is described. The method includes: acquiring vehicle acceleration in x, y and z directions; acquiring a rack force; acquiring a wheel speed for each of all four wheels; determining a wheel speed energy based on the wheel speed; determining a wheel slip of all four wheels of the vehicle based on a respective wheel speed of the wheel; determining an acceleration energy in each of the x, y and z-directions based on the vehicle acceleration and the vehicle speed; determining a rack force energy based on the detected rack force; and determining road properties based on the wheel speed energy, rack force energy and vehicle speed. A system is also described for performing the method.Type: GrantFiled: October 6, 2017Date of Patent: July 7, 2020Assignee: VOLVO CAR CORPORATIONInventors: Henrik Gullven, Tony Gustafsson, Mats Skold
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Publication number: 20180106714Abstract: A method is described for determining a friction estimate between a road surface and a tire of a vehicle, the tire being arranged on a steerable wheel of the vehicle, and the vehicle having an axle rack pivotably attached to a linkage arm connected to the steerable wheel such that a translational motion of the axle rack causes the linkage arm to rotate about a kingpin element such that the linkage arm causes a turning motion of the steerable wheel. The method includes acquiring a plurality of rack force values; acquiring a plurality of lateral wheel force values; mapping a relation between the plurality of rack force values and the lateral wheel force values to a model; and determining the lateral friction estimate based on the mapping.Type: ApplicationFiled: October 6, 2017Publication date: April 19, 2018Applicant: VOLVO CAR CORPORATIONInventors: Mats SKOLD, Tony GUSTAFSSON, Henrik GULLVEN
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Publication number: 20180105206Abstract: A method in a vehicle for determining road properties is described. The method includes: acquiring vehicle acceleration in x, y and z directions; acquiring a rack force; acquiring a wheel speed for each of all four wheels; determining a wheel speed energy based on the wheel speed; determining a wheel slip of all four wheels of the vehicle based on a respective wheel speed of the wheel; determining an acceleration energy in each of the x, y and z-directions based on the vehicle acceleration and the vehicle speed; determining a rack force energy based on the detected rack force; and determining road properties based on the wheel speed energy, rack force energy and vehicle speed. A system is also described for performing the method.Type: ApplicationFiled: October 6, 2017Publication date: April 19, 2018Applicant: VOLVO CAR CORPORATIONInventors: Henrik GULLVEN, Tony GUSTAFSSON, Mats SKOLD
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Publication number: 20180105181Abstract: A method is described for computing a friction estimate between a road surface and a tire of a vehicle when the vehicle is in motion along a course, the tire being arranged on a steerable wheel of the vehicle, and the vehicle including two front wheels and two rear wheels and an axle rack pivotably attached to a linkage arm connected to the steerable wheel such that a translational motion of the axle rack causes the linkage arm to rotate about a kingpin element such that the linkage arm causes a turning motion of the steerable wheel. A corresponding system and vehicle are also described.Type: ApplicationFiled: October 6, 2017Publication date: April 19, 2018Applicant: VOLVO CAR CORPORATIONInventors: Mats SKOLD, Mats JONASSON
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Patent number: 9673899Abstract: There is provided a system and a method for determining an in-band noise parameter representative of the optical noise contribution (such as OSNR) on a polarization-multiplexed optical Signal-Under-Test (SUT) comprising two polarized phase-modulated data-carrying contributions and an optical noise contribution.Type: GrantFiled: March 24, 2014Date of Patent: June 6, 2017Assignee: EXFO Inc.Inventors: Henrik Sunnerud, Mats Skold, Mathias Westlund
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Patent number: 9596027Abstract: There is provided a method and an apparatus for determining quality parameters on a polarization-multiplexed optical signal based on an analysis of the power spectral density of the Signal-Under-Test (SUT). The method is predicated upon knowledge of the spectral shape of the signal in the absence of significant noise or spectral deformation. This knowledge is provided by a reference optical spectrum trace. Based on this knowledge and under the assumption that ASE noise level is approximately constant in wavelength over a given spectral range, the spectral deformation of the signal contribution of the SUT may be estimated using a comparison of the spectral variations of the optical spectrum trace of the SUT with that of the reference optical spectrum trace.Type: GrantFiled: May 2, 2014Date of Patent: March 14, 2017Assignee: Exfo Inc.Inventors: Gang He, Daniel Gariepy, Mats Skold
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Patent number: 9325428Abstract: A two-gate sampling system has been designed to perform sampled balanced detection of one or more input signal pairs. The present invention performs simultaneous sampling of both signals in each signal pair followed by digitization and combination of the sample pairs using software. By first sampling the signals and then combining the sampled into the corresponding balanced detected signal it is possible to avoid the bandwidth limitations and impedance problems introduced by traditional balanced detectors and electrical oscilloscopes. In particular, for optical sampling gates very high bandwidth sampling gates can be designed without any impedance issues and hence almost perfect balanced detection reconstruction can be performed for very high speed signals. Balanced detection is becoming more and more important as the new phase modulated optical data signals are introduced to the market, such as e.g. PSK, DPSK, QPSK and DQPSK. The present invention is well suited for analysis of these new types of signals.Type: GrantFiled: September 17, 2009Date of Patent: April 26, 2016Assignee: EXFO INC.Inventors: Mathias Westlund, Peter Andrekson, Henrik Sunnerud, Mats Skold
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Publication number: 20150110486Abstract: There is provided a system and a method for determining an in-band noise parameter representative of the optical noise contribution (such as OSNR) on a polarization-multiplexed optical Signal-Under-Test (SUT) comprising two polarized phase-modulated data-carrying contributions and an optical noise contribution.Type: ApplicationFiled: March 24, 2014Publication date: April 23, 2015Applicant: EXFO INC.Inventors: Henrik Sunnerud, Mats Skold, Mathias Westlund
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Publication number: 20140328586Abstract: There is provided a method and an apparatus for determining quality parameters on a polarization-multiplexed optical signal based on an analysis of the power spectral density of the Signal-Under-Test (SUT). The method is predicated upon knowledge of the spectral shape of the signal in the absence of significant noise or spectral deformation. This knowledge is provided by a reference optical spectrum trace. Based on this knowledge and under the assumption that ASE noise level is approximately constant in wavelength over a given spectral range, the spectral deformation of the signal contribution of the SUT may be estimated using a comparison of the spectral variations of the optical spectrum trace of the SUT with that of the reference optical spectrum trace.Type: ApplicationFiled: May 2, 2014Publication date: November 6, 2014Applicant: EXFO Inc.Inventors: Gang HE, Daniel GARIEPY, Mats SKOLD
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Patent number: 8768180Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of an optical input signal utilizes coherent mixing of the optical input signal with a reference laser source in a phase-diverse optical hybrid solution, followed by optical sampling of the coherently-mixed fields at the output of the optical hybrid. The generated streams of optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the original optical input signal.Type: GrantFiled: February 23, 2010Date of Patent: July 1, 2014Assignee: ExFo, Inc.Inventors: Mathias Westlund, Mats Skold, Henrik Sunnerud, Peter Andrekson, Bernard Ruchet
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Patent number: 8280245Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of a data-carrying optical input signal. The present invention includes optical sampling of the optical input signal, followed by coherent mixing with a reference laser source in an optical hybrid solution. The generated streams of mixed optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the data-carrying optical input signal.Type: GrantFiled: February 23, 2010Date of Patent: October 2, 2012Assignee: EXFO. Inc.Inventors: Mathias Westlund, Mats Sköld, Henrik Sunnerud, Peter A. Andrekson
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Publication number: 20120134667Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of an optical input signal utilizes coherent mixing of the optical input signal with a reference laser source in a phase-diverse optical hybrid solution, followed by optical sampling of the coherently-mixed fields at the output of the optical hybrid. The generated streams of optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the original optical input signal.Type: ApplicationFiled: February 23, 2010Publication date: May 31, 2012Applicant: EXFO INC.Inventors: Mathias Westlund, Mats Skold, Henrik Sunnerud, Peter Andrekson, Bernard Ruchet
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Publication number: 20110182573Abstract: A two-gate sampling system has been designed to perform sampled balanced detection of one or more input signal pairs. The present invention performs simultaneous sampling of both signals in each signal pair followed by digitization and combination of the sample pairs using software. By first sampling the signals and then combining the sampled into the corresponding balanced detected signal it is possible to avoid the bandwidth limitations and impedance problems introduced by traditional balanced detectors and electrical oscilloscopes. In particular, for optical sampling gates very high bandwidth sampling gates can be designed without any impedance issues and hence almost perfect balanced detection reconstruction can be performed for very high speed signals. Balanced detection is becoming more and more important as the new phase modulated optical data signals are introduced to the market, such as e.g. PSK, DPSK, QPSK and DQPSK. The present invention is well suited for analysis of these new types of signals.Type: ApplicationFiled: September 17, 2009Publication date: July 28, 2011Applicant: EXFO INC.Inventors: Mathias Westlund, Peter Andrekson, Henrik Sunnerud, Mats Skold
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Publication number: 20100215357Abstract: An optical sampling arrangement for high-speed measurement of the time-varying electric field of a data-carrying optical input signal. The present invention includes optical sampling of the optical input signal, followed by coherent mixing with a reference laser source in an optical hybrid solution. The generated streams of mixed optical samples are then detected and signal processed in order to reconstruct a sampled version of the electric field of the data-carrying optical input signal.Type: ApplicationFiled: February 23, 2010Publication date: August 26, 2010Inventors: Mathias Westlund, Mats Sköld, Henrik Sunnerud, Peter A. Andrekson