Patents by Inventor Hakan Johansson
Hakan Johansson 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: 11125151Abstract: A telescopic piston for use with an internal combustion engine includes an inner piston; an outer piston located over the inner piston; an upper oil chamber formed between the inner piston and the outer piston; and an actuated valve having a controllable peak pressure that opens the actuated valve. A value of the peak pressure is wirelessly received at the telescopic piston.Type: GrantFiled: February 25, 2019Date of Patent: September 21, 2021Assignee: KING ABDULLAH UNIVERSITY OF SCIENCE AND TECHNOLOGYInventor: Bengt Håkan Johansson
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Publication number: 20200408145Abstract: A telescopic piston for use with an internal combustion engine includes an inner piston; an outer piston located over the inner piston; an upper oil chamber formed between the inner piston and the outer piston; and an actuated valve having a controllable peak pressure that opens the actuated valve. A value of the peak pressure is wirelessly received at the telescopic piston.Type: ApplicationFiled: February 25, 2019Publication date: December 31, 2020Inventor: Bengt Håkan JOHANSSON
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Patent number: 10300759Abstract: A method is provided for determining whether or not ground contact loss is imminent for a wheel of a vehicle, the vehicle including a vehicle body having a vertical extension in a vertical direction, the wheel being allowed to be subjected to a relative vertical displacement, in the vertical direction, in relation to the vehicle body, the vehicle further being such that a maximum value of a vertical displacement of the wheel relative to the vehicle body is limited to a relative vertical displacement limit, the method including determining an actual relative vertical displacement of the wheel relative to the vehicle body, determining a limit margin as the difference between the actual relative vertical displacement and the relative vertical position limit, and determining that ground contact loss is imminent for a wheel if the limit margin is within a predetermined vertical threshold range.Type: GrantFiled: June 18, 2014Date of Patent: May 28, 2019Assignee: Volvo Construction Equipment ABInventors: Stefan Andreasson, Håkan Johansson
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Publication number: 20170129299Abstract: A method is provided for determining whether or not ground contact loss is imminent for wheel of a vehicle, the vehicle including a vehicle body having a vertical extension in a vertical direction, the wheel being allowed to be subjected to a relative vertical displacement, in the vertical direction, in relation to the vehicle body, the vehicle further being such that a maximum value of a vertical displacement of the wheel relative to the vehicle body is limited to a relative vertical displacement limit; the method including determining an actual relative vertical displacement of the wheel relative to the vehicle body, determining a limit margin as the difference between the actual relative vertical displacement and the relative vertical position limit, and determining that ground contact loss is imminent for a wheel if the limit margin is within a predetermined vertical threshold range.Type: ApplicationFiled: June 18, 2014Publication date: May 11, 2017Applicant: VOLVO CONSTRUCTION EQUIPMENT ABInventors: Stefan ANDREASSON, Håkan JOHANSSON
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Patent number: 9628097Abstract: A method and device for handling an in-phase and quadrature (“I/Q”) channel mismatch of an I/Q down-converted signal, and a use of the device. A discrete-time complex valued signal r(n) based on an analog-to-digital conversion of the I/Q down-converted signal is obtained. The obtained discrete-time complex valued signal r(n) is oversampled by a factor of two or more. An intermediate signal v(n) is formed from the discrete-time complex valued signal r(n). The intermediate signal v(n) corresponds to the real part of a ?/2 frequency shifted version of the obtained discrete-time complex valued signal r(n). A procedure for obtaining an estimate of a frequency dependent mismatch of a two-channel time-interleaved analog-to-digital converter (“TI-ADC”) is applied on the formed intermediate signal v(n). Thereby a TI-ADC mismatch estimate is obtained. The I/Q channel mismatch is estimated and/or compensated based on the obtained TI-ADC mismatch estimate.Type: GrantFiled: December 18, 2012Date of Patent: April 18, 2017Assignee: Signal Processing Devices Sweden ABInventor: Håkan Johansson
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Publication number: 20150333950Abstract: A method and device for handling an in-phase and quadrature (“I/Q”) channel mismatch of an I/Q down-converted signal, and a use of the device. A discrete-time complex valued signal r(n) based on an analog-to-digital conversion of the I/Q down-converted signal is obtained. The obtained discrete-time complex valued signal r(n) is oversampled by a factor of two or more. An intermediate signal v(n) is formed from the discrete-time complex valued signal r(n). The intermediate signal v(n) corresponds to the real part of a ?/2 frequency shifted version of the obtained discrete-time complex valued signal r(n). A procedure for obtaining an estimate of a frequency dependent mismatch of a two-channel time-interleaved analog-to-digital converter (“TI-ADC”) is applied on the formed intermediate signal v(n). Thereby a TI-ADC mismatch estimate is obtained. The I/Q channel mismatch is estimated and/or compensated based on the obtained TI-ADC mismatch estimate.Type: ApplicationFiled: December 18, 2012Publication date: November 19, 2015Applicant: SIGNAL PROCESSING DEVICES SWEDEN ABInventor: Håkan Johansson
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Patent number: 8825415Abstract: An estimation unit for estimating a nonlinearity error of a conversion circuit, such as an ADC, is adapted to receive a continuous-time input signal and output a digital output signal. In at least one embodiment, the continuous-time input signal is essentially bandlimited to an angular frequency band [?1, ?2], where ?1>(L?1)?/T, ?2<L?/T, L is a positive integer, and T is a sample period of the conversion circuit. The estimation unit includes an input port for receiving a digital input signal having a first sample rate 1/T and an output port for outputting a digital estimated error signal also having the first sample rate.Type: GrantFiled: December 16, 2008Date of Patent: September 2, 2014Assignee: Signal Processing Devices Sweden ABInventor: Håkan Johansson
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Patent number: 8752434Abstract: A fiber optical system for pressure measurement has a pressure sensor element (4) with at least two parallel partially reflecting surfaces (5, 7), one of which is arranged on a diaphragm (6) movable with respect to another fixed said surface as a consequence of pressure differences across said diaphragm. Said surfaces are arranged so as to cause interference phenomena of light inciding substantially perpendicularly onto and reflected by the two surfaces depending upon the actual 10 distance between these surfaces. The pressure sensor element is made of material being stable at a continuous temperature up to at least 800° C. At least said diaphragm (6) of the sensor element is made of Si C, and at least a part (23) of the optical fiber (3) connecting to said sensor element is made of a material able to withstand a continuous temperature of at least 800° C.Type: GrantFiled: June 2, 2010Date of Patent: June 17, 2014Assignee: Simea Optic ABInventor: Håkan Johansson
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Patent number: 8588336Abstract: Methods for compensation of imbalance between I (In-phase) and Q (Quadrature) signal paths (12a, 12b, 605a, 605b) in a quadrature receiver (8) and a quadrature transmitter (600) are disclosed. In the receiver case, the imbalance is compensated for by means of post-distortion in the digital domain. In the transmitter case, the imbalance is compensated for by means of pre-distortion in the digital domain. The methods can be carried out with a relatively low computational complexity. Signal-processing devices (30, 610) for carrying out the methods are disclosed as well. The same basic internal structure may be used for the signal-processing device (30) in the receiver case as for the signal processing device (610) in the transmitter case.Type: GrantFiled: March 20, 2009Date of Patent: November 19, 2013Assignee: Signal Processing Devices Sweden ABInventor: Håkan Johansson
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Patent number: 8490741Abstract: A straight motion assisting device for a work machine is adapted for receiving an input indicative of a steering angle from a position of a moveable member and adapted for applying a restoring force for affecting the work machine towards a straight motion when the steering angle input indicates that the work machine deviates from the straight motion. The device includes a hydraulic system adapted to be effected by the displacement of the moveable member and adapted to apply the restoring force.Type: GrantFiled: June 18, 2008Date of Patent: July 23, 2013Assignee: Volvo Construction Equipment ABInventor: Hàkan Johansson
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Patent number: 8395057Abstract: A wafer assembly (30) includes a substrate (71), in turn including a wafer (70) or a stack of wafers. The wafer assembly (30) further includes an electrical connection (32) arranged through at least a part of the substrate (71). The electrical connection (32) is made by low-resistance silicon. The electrical connection (32) is positioned in a hole (84) penetrating at least a part of the substrate (71). A surface (78) of the substrate (71) confining the hole (84) is electrically insulating. The electrical connection (32) has at least one protrusion (75), which protrudes transversally to a main extension (83) of the hole (84) and the protrusion (75) protrudes outside a minimum hole diameter (85), as projected in the main extension (83) of the hole (84). Preferably, the protrusion (75) is supported by a support surface (81) of the substrate (71). A manufacturing method is also disclosed.Type: GrantFiled: September 4, 2007Date of Patent: March 12, 2013Assignee: NanoSpace ABInventors: Pelle Rangsten, Hakan Johansson, Johan Bejhed
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Publication number: 20130008848Abstract: A filter comprises a stack of wafers (28). Each of the wafers has a through hole (6). Edges (7) of the holes together define an internal tube. An interface (32) between adjacent wafers defines filter channels. The filter channels comprises first coarse filter channels (20), second coarse filter channels (22) and fine filter channels (26). The first coarse filter channels are open towards an outer rim (5), extend in a direction from the outer rim and are closed towards the internal tube. The second coarse filter channels are arranged in an opposite manner. The fine filter channels connect the first and second coarse filter channels. The first and second coarse filter channels extend radially (R) and the fine filter channels extend tangentially (T). The first and second coarse filter channels are defined by recesses in a surface of a first wafer and the fine filter channels are defined by recesses, each one encircling the hole, in a surface of a second wafer.Type: ApplicationFiled: April 4, 2011Publication date: January 10, 2013Applicant: NANOSPACE ABInventors: Kerstin Jonsson, Maria Bendixen, Håkan Johansson, Tor-Arne Grönland
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Patent number: 8336314Abstract: A nozzle arrangement for use in a gas thruster is presented. At least one heater micro structure (20) is arranged in a stagnation chamber (12) of the gas thruster. The heater microstructure (20) comprises a core of silicon or a silicon compound coated by a surface metal or metal compound coating. The heater microstructure (20) is manufactured in silicon or a silicon compound and covered by a surface metal coating. The heater microstructure (20) is mounted in the stagnation chamber (12) before or after the coverage of the surface metal or metal compound coating. The coverage is performed by heating the heater microstructure and flowing a gas comprising low quantities of a metal compound. The compound decomposes at the heated heater microstructure (20), forming the surface metal or metal compound coating. The same principles of coating can be used for repairing the heater microstructure (20) in situ.Type: GrantFiled: September 4, 2007Date of Patent: December 25, 2012Assignee: NanoSpace ABInventors: Tor-Arne Gronland, Pelle Ransten, Hakan Johansson, Johan Bejhed
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Patent number: 8307248Abstract: A method and a module for estimating a plurality of relative channel-error for at least one signal with respect to a reference signal. The signals and are produced by an analog-to-digital module including parallel and time interleaved analog-to-digital converters and are received by an estimation module. The method is performed by the estimation module and includes defining a function representing a relationship between the reference signal and an arbitrary signal in the group of signals, selecting a first reference signal in the group of signals, selecting a second signal from the remaining signals in the group, optimizing the function so as to obtain an estimate of the plurality of relative channel-error, and repeating the selecting a second signal and optimizing the function for each remaining signal.Type: GrantFiled: June 30, 2006Date of Patent: November 6, 2012Assignee: Signal Processing Devices Sweden ABInventors: Håkan Johansson, Per Löwenborg
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Publication number: 20120099673Abstract: Methods for compensation of imbalance between I (In-phase) and Q (Quadrature) signal paths (12a, 12b, 605a, 605b) in a quadrature receiver (8) and a quadrature transmitter (600) are disclosed. In the receiver case, the imbalance is compensated for by means of post-distortion in the digital domain. In the transmitter case, the imbalance is compensated for by means of pre-distortion in the digital domain. The methods can be carried out with a relatively low computational complexity. Signal-processing devices (30, 610) for carrying out the methods are disclosed as well. The same basic internal structure may be used for the signal-processing device (30) in the receiver case as for the signal processing device (610) in the transmitter case.Type: ApplicationFiled: March 20, 2009Publication date: April 26, 2012Inventor: Håkan Johansson
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Publication number: 20120085175Abstract: A fibre optical system for pressure measurement has a pressure sensor element (4) with at least two parallel partially reflecting surfaces (5, 7), one of which is arranged on a diaphragm (6) movable with respect to another fixed said surface as a consequence of pressure differences across said diaphragm. Said surfaces are arranged so as to cause interference phenomena of light inciding substantially perpendicularly onto and reflected by the two surfaces depending upon the actual 10 distance between these surfaces. The pressure sensor element is made of material being stable at a continuous temperature up to at least 800° C. At least said diaphragm (6) of the sensor element is made of Si C, and at least a part (23) of the optical fibre (3) connecting to said sensor element is made of a material able to withstand a continuous temperature of at least 800° C.Type: ApplicationFiled: June 2, 2010Publication date: April 12, 2012Inventor: Hákan Johansson
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Publication number: 20110276284Abstract: An estimation unit for estimating a nonlinearity error of a conversion circuit, such as an ADC, is adapted to receive a continuous-time input signal and output a digital output signal. In at least one embodiment, the continuous-time input signal is essentially bandlimited to an angular frequency band [?1, ?2], where ?1>(L?1)?/T, ?2<L?/T, L is a positive integer, and T is a sample period of the conversion circuit. The estimation unit includes an input port for receiving a digital input signal having a first sample rate 1/T and an output port for outputting a digital estimated error signal also having the first sample rate.Type: ApplicationFiled: December 16, 2008Publication date: November 10, 2011Applicant: Signal Processing Devices Sweden ABInventor: Håkan Johansson
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Patent number: 8009070Abstract: A method for the compensation of frequency-response mismatch errors in M-channel time-interleaved ADCs. The compensation is done through an M-periodic time-varying filter hn(k)=hn mod M(k) (2), or, equivalently, a set of M time-invariant filters hn(k), n=0, 1, . . . , M?1. The overall compensation system is constructed by determining the M filter impulse responses hn(k) through M separate matrix inversions, where the size of the matrices equals the filter impulse response length. Also, a compensated M-channel time-interleaved ADC based on and performing the method.Type: GrantFiled: June 21, 2007Date of Patent: August 30, 2011Assignee: Signal Processing Devices Sweden ABInventors: Håkan Johansson, Per Löwenborg
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Publication number: 20110151925Abstract: A portable electronic device is disclosed. The portable electronic device comprises a camera unit adapted to capture images of an object on a first side of the portable electronic device, a memory unit for storing data, and a control unit. The control unit is adapted to analyze images captured by the camera unit in order to trace movement of a pointer device, said movement forming a selection path. Furthermore, the control unit is adapted to determine when said selection path is closed thereby forming a selection area and, in response thereto, generate image data representing the part of an image of the object captured by the camera unit that is within the selection area. Moreover, the control unit is adapted to save said image data to the memory unit.Type: ApplicationFiled: December 18, 2009Publication date: June 23, 2011Applicant: Sony Ericsson Mobile Communications ABInventor: Hakan JOHANSSON
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Publication number: 20110067944Abstract: A straight motion assisting device for a work machine is adapted for receiving an input indicative of a steering angle from a position of a moveable member and adapted for applying a restoring force for affecting the work machine towards a straight motion when the steering angle input indicates that the work machine deviates from the straight motion. The device includes a hydraulic system adapted to be effected by the displacement of the moveable member and adapted to apply the restoring force.Type: ApplicationFiled: June 17, 2008Publication date: March 24, 2011Applicant: Volvo Construction Equipment ABInventor: Håkan Johansson