Patents by Inventor Liang-Cheng Chang

Liang-Cheng Chang 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).

  • Patent number: 9976646
    Abstract: An angle regulation device includes a casing, a regulating gear, a driving mechanism, a transmitting mechanism and a powering unit. The regulating gear is pivoted to the casing and is mounted with a radar detector. The driving mechanism includes co-rotatable rotating shaft, and first and second driving members. The transmitting mechanism includes first and second transmitting units each including a transmitting gear that meshes with the regulating gear and that has a gear radius smaller than that of the regulating gear, and a transmitting engaging structure that meshes with a respective one of the first and second driving members. The powering unit is coupled to the rotating shaft for rotating the radar detector relative to the casing.
    Type: Grant
    Filed: May 28, 2015
    Date of Patent: May 22, 2018
    Assignee: Automotive Research & Testing Center
    Inventors: Hsien-Yu Kuo, Jiun-Jie Chen, Liang-Cheng Chang, Shun-Hung Chen
  • Patent number: 9776613
    Abstract: An abnormal detecting system for a pneumatic brake includes a pedal stroke sensor, a front chamber pressure sensor, a rear chamber pressure sensor, a storage unit pressure sensor, a parking brake switch and an abnormal detecting circuit. A pedal stroke signal, a front chamber pressure signal, a rear chamber pressure signal, an air storage unit pressure and a parking brake control signal are output. The abnormal detecting circuit receives the pedal stroke signal, the front chamber pressure signal, the rear chamber pressure signal, the air storage unit pressure signal and the parking brake control signal. The abnormal detecting circuit compares the pedal stroke signal with the front chamber pressure signal or the rear chamber pressure signal and then outputs a first abnormal signal; and the abnormal detecting circuit compares the parking brake control signal and then outputs a second abnormal signal.
    Type: Grant
    Filed: December 11, 2015
    Date of Patent: October 3, 2017
    Assignee: Automotive Research & Testing Center
    Inventors: Liang-Cheng Chang, Jiun-Jie Chen, Hsien-Yu Kuo
  • Publication number: 20170166180
    Abstract: An abnormal detecting system for a pneumatic brake includes a pedal stroke sensor, a front chamber pressure sensor, a rear chamber pressure sensor, a storage unit pressure sensor, a parking brake switch and an abnormal detecting circuit. A pedal stroke signal, a front chamber pressure signal, a rear chamber pressure signal, an air storage unit pressure and a parking brake control signal are output. The abnormal detecting circuit receives the pedal stroke signal, the front chamber pressure signal, the rear chamber pressure signal, the air storage unit pressure signal and the parking brake control signal. The abnormal detecting circuit compares the pedal stroke signal with the front chamber pressure signal or the rear chamber pressure signal and then outputs a first abnormal signal; and the abnormal detecting circuit compares the parking brake control signal and then outputs a second abnormal signal.
    Type: Application
    Filed: December 11, 2015
    Publication date: June 15, 2017
    Inventors: Liang-Cheng CHANG, Jiun-Jie CHEN, Hsien-Yu KUO
  • Patent number: 9533545
    Abstract: An electric vehicle thermal management system includes a dynamic heat dissipating unit, an air conditioner unit, a heat exchange unit, and a control unit. The heat exchange unit is connected to the dynamic heat dissipating unit and the air conditioner unit for transferring heat therebetween. The control unit adjusts the flow rate of a coolant in the dynamic heat dissipating unit for controlling and adjusting the heat dissipating ability of the dynamic heat dissipating unit to meet the heat dissipation of the system, thereby improving distribution and management of heat energy in the system.
    Type: Grant
    Filed: December 27, 2013
    Date of Patent: January 3, 2017
    Assignee: Automotive Research & Testing Center
    Inventors: Liang-Cheng Chang, Hong-Chi Wang, Chih-Jung Yeh, Shih-Jung Ho
  • Patent number: 9517755
    Abstract: An autonomous braking system includes a detecting module, a tracing module, a collision path prediction module, a memory register, a collision time prediction module and a decision module. The detecting module recognizes multiple objects located ahead of a vehicle, and then the tracing module traces the moving objects. The collision path prediction module is used to obtain a possible collision range and a non-collision range. The memory register records the coordinate of the objects located within the possible collision range. When one of the objects moves out of the possible collision range, its data is instantaneously removed from the memory register. The collision time prediction module predicts a collision time between the vehicle and each of the objects. The decision module determines if a brake assist is activated in accordance with the collision time.
    Type: Grant
    Filed: May 25, 2015
    Date of Patent: December 13, 2016
    Assignee: Automotive Research & Testing Center
    Inventors: Shun-Hung Chen, Jiun-Jie Chen, Liang-Cheng Chang
  • Publication number: 20160348770
    Abstract: An angle regulation device includes a casing, a regulating gear, a driving mechanism, a transmitting mechanism and a powering unit. The regulating gear is pivoted to the casing and is mounted with a radar detector. The driving mechanism includes co-rotatable rotating shaft, and first and second driving members. The transmitting mechanism includes first and second transmitting units each including a transmitting gear that meshes with the regulating gear and that has a gear radius smaller than that of the regulating gear, and a transmitting engaging structure that meshes with a respective one of the first and second driving members. The powering unit is coupled to the rotating shaft for rotating the radar detector relative to the casing.
    Type: Application
    Filed: May 28, 2015
    Publication date: December 1, 2016
    Inventors: Hsien-Yu Kuo, Jiun-Jie Chen, Liang-Cheng Chang, Shun-Hung Chen
  • Publication number: 20160347293
    Abstract: An autonomous braking system includes a detecting module, a tracing module, a collision path prediction module, a memory register, a collision time prediction module and a decision module. The detecting module recognizes multiple objects located ahead of a vehicle, and then the tracing module traces the moving objects. The collision path prediction module is used to obtain a possible collision range and a non-collision range. The memory register records the coordinate of the objects located within the possible collision range. When one of the objects moves out of the possible collision range, its data is instantaneously removed from the memory register. The collision time prediction module predicts a collision time between the vehicle and each of the objects. The decision module determines if a brake assist is activated in accordance with the collision time.
    Type: Application
    Filed: May 25, 2015
    Publication date: December 1, 2016
    Inventors: Shun-Hung CHEN, Jiun-Jie CHEN, Liang-Cheng CHANG
  • Patent number: 9346449
    Abstract: A fault warning method of an electric parking brake is provided. The fault warning method includes, a brake is actuated with a motor. An armature current is transmitted from the motor. The armature current is converted to a low frequency current and a high frequency current. A braking force is estimated by the by the low frequency current, and a motor rotating speed is estimated by the high frequency current. The braking force is compared with a predetermined braking force range, and a braking force comparing signal is outputted. The motor rotating speed is compared with a predetermined rotating speed range, and a rotating speed comparing signal is outputted. A determining result is generated by determining the braking force comparing signal and the rotating speed comparing signal. And a warning signal is generated according to the determining result.
    Type: Grant
    Filed: December 25, 2014
    Date of Patent: May 24, 2016
    Assignee: Automotive Research & Testing Center
    Inventors: Liang-Cheng Chang, Jiun-Jie Chen, Shih-Chieh Huang
  • Publication number: 20150121922
    Abstract: An electric vehicle thermal management system includes a dynamic heat dissipating unit, an air conditioner unit, a heat exchange unit, and a control unit. The heat exchange unit is connected to the dynamic heat dissipating unit and the air conditioner unit for transferring heat therebetween. The control unit adjusts the flow rate of a coolant in the dynamic heat dissipating unit for controlling and adjusting the heat dissipating ability of the dynamic heat dissipating unit to meet the heat dissipation of the system, thereby improving distribution and management of heat energy in the system.
    Type: Application
    Filed: December 27, 2013
    Publication date: May 7, 2015
    Applicant: Automotive Research & Testing Center
    Inventors: Liang-Cheng Chang, Hong-Chi Wang, Chih-Jung Yeh, Shih-Jung Ho
  • Patent number: 8428205
    Abstract: A communications apparatus is provided. A first wireless communications module provides a first wireless communications service and communicates with a first communications device in compliance with a first protocol. A second wireless communications module provides a second wireless communications service and communicates with a second communications device in compliance with a second protocol. A clock source is shared by the first and the second communications modules and provides a reference clock to the first and the second communications modules. The first wireless communications module detects a request from the second wireless communications module for activating the clock source, determines whether the reference clock has been stably generated by the clock source, and adjusts an electrical characteristic of the clock source to facilitate the reference clock output from the clock source to achieve a target frequency when the reference clock has not been stably generated.
    Type: Grant
    Filed: March 8, 2010
    Date of Patent: April 23, 2013
    Assignee: Mediatek Inc.
    Inventors: Liang-Cheng Chang, Ming-Jie Yang, Wei-Lun Wan, Juei-Ting Sun, Hong-Kai Hsu, Wei-Ning Chien
  • Patent number: 8139553
    Abstract: An embodiment of a method for link management in a scatternet, performed by a wireless communication device, is provided. The wireless communication device simultaneously establishes a synchronization link in a first piconet, and an asynchronization link in a second piconet. The embodiment of the method contains the following steps. At least one time interval originally utilized for packet transmissions in the synchronization link is sacrificed. During the sacrificed time interval, the asynchronization link is switched to for a time period to maintain connection between the wireless communication device and a peer device operating with the asynchronization link.
    Type: Grant
    Filed: January 11, 2008
    Date of Patent: March 20, 2012
    Assignee: Mediatek Inc.
    Inventors: Liang-Cheng Chang, Wei-Lun Wan
  • Publication number: 20110075778
    Abstract: A communications apparatus is provided. A first wireless communications module provides a first wireless communications service and communicates with a first communications device in compliance with a first protocol. A second wireless communications module provides a second wireless communications service and communicates with a second communications device in compliance with a second protocol. A clock source is shared by the first and the second communications modules and provides a reference clock to the first and the second communications modules. The first wireless communications module detects a request from the second wireless communications module for activating the clock source, determines whether the reference clock has been stably generated by the clock source, and adjusts an electrical characteristic of the clock source to facilitate the reference clock output from the clock source to achieve a target frequency when the reference clock has not been stably generated.
    Type: Application
    Filed: March 8, 2010
    Publication date: March 31, 2011
    Applicant: MEDIATEK INC.
    Inventors: Liang-Cheng Chang, Ming-Jie Yang, Wei-Lun Wan, Juei-Ting Sun, Hong-Kai Hsu, Wei-Ning Chien
  • Publication number: 20110076945
    Abstract: A wireless communications module coexisting with a wireless telephony communications module includes a radio frequency (RF) module, a MODEM, a clock generator and distributor and a system control logic. The system control logic issues an external interrupt (EINT) signal to the wireless telephony communications module for activating a clock source via the wireless telephony communications module. When the clock source is activated, the clock generator and distributor receives a reference clock from the activated clock source, converts the reference clock into one or more internal clocks and drives the internal clock or clocks to the RF module and the MODEM for synchronization therebetween.
    Type: Application
    Filed: July 27, 2010
    Publication date: March 31, 2011
    Applicant: MEDIATEK INC.
    Inventors: Liang-Cheng Chang, Ming-Jie Yang, Wei-Lun Wan, Juei-Ting Sun, Hong-Kai Hsu, Wei-Ning Chien
  • Patent number: 7733938
    Abstract: An embodiment of an apparatus for channel assessment is provided, comprising a radio frequency (RF) unit, a baseband unit and a microprocessor control unit (MCU). The baseband unit coupling to the RF unit directs the RF unit to selectively hop into one of a plurality of available channels in a frequency band using a pseudorandom sequence to receive a plurality of packets via the hopped channel. The MCU coupling to the baseband unit accumulates a measure for the hopped channel according to reception results of the packets and marks the hopped channel as a bad channel when the accumulated measure exceeds a predetermined threshold. The measure represents the inaccuracy extent during packet reception via the hopped channel.
    Type: Grant
    Filed: September 11, 2007
    Date of Patent: June 8, 2010
    Assignee: Mediatek Inc.
    Inventors: Shun-Pin Yang, Hong-Kai Hsu, Chung-Shine Huang, Liang-Cheng Chang
  • Publication number: 20090271593
    Abstract: An electronic device comprising a ROM, a reprogrammable memory, a processor, and a patching device. The ROM stores a first function starting from a first address, the reprogrammable memory stores a second function starting from a second address, the patching device couples to the ROM and the reprogrammable memory, and the processor couples to the patching device. The patching device receives directive information from the processor and determines whether the processor is going to fetch the first function, and generates and returns a branch instruction to the processor when the processor is going to fetch the first function. After receiving the branch instruction, the processor executes the branch instruction to cause an unconditional jump to the second address and subsequently fetches the second function.
    Type: Application
    Filed: April 29, 2008
    Publication date: October 29, 2009
    Applicant: MEDIATEK INC.
    Inventors: Ting-Cheng Hsu, Liang-Cheng Chang, Hong-Kai Hsu
  • Publication number: 20090180460
    Abstract: An embodiment of a method for link management in a scatternet, performed by a wireless communication device, is provided. The wireless communication device simultaneously establishes a synchronization link in a first piconet, and an asynchronization link in a second piconet. The embodiment of the method contains the following steps. At least one time interval originally utilized for packet transmissions in the synchronization link is sacrificed. During the sacrificed time interval, the asynchronization link is switched to for a time period to maintain connection between the wireless communication device and a peer device operating with the asynchronization link.
    Type: Application
    Filed: January 11, 2008
    Publication date: July 16, 2009
    Applicant: MEDIATEK INC.
    Inventors: Liang-Cheng Chang, Wei-Lun Wan
  • Publication number: 20090041088
    Abstract: An embodiment of an apparatus for channel assessment is provided, comprising a radio frequency (RF) unit, a baseband unit and a microprocessor control unit (MCU). The baseband unit coupling to the RF unit directs the RF unit to selectively hop into one of a plurality of available channels in a frequency band using a pseudorandom sequence to receive a plurality of packets via the hopped channel. The MCU coupling to the baseband unit accumulates a measure for the hopped channel according to reception results of the packets and marks the hopped channel as a bad channel when the accumulated measure exceeds a predetermined threshold. The measure represents the inaccuracy extent during packet reception via the hopped channel.
    Type: Application
    Filed: September 11, 2007
    Publication date: February 12, 2009
    Applicant: MEDIATEK INC.
    Inventors: Shun-Pin Yang, Hong-Kai Hsu, Chung-Shine Huang, Liang-Cheng Chang