Denso has been granted a patent for a system that allows access and operational control of a vehicle. The system includes a master device that transmits a challenge signal to a portable access device, and receives a response signal and arrival times from a separate sniffer device. A control module estimates the distance or location of the portable access device based on the arrival times. GlobalData’s report on Denso gives a 360-degree view of the company including its patenting strategy. Buy the report here.
According to GlobalData’s company profile on Denso, Battery management systems was a key innovation area identified from patents. Denso's grant share as of September 2023 was 33%. Grant share is based on the ratio of number of grants to total number of patents.
A system for accessing or controlling a vehicle remotely
A recently granted patent (Publication Number: US11776334B2) describes a system for accessing and controlling a vehicle. The system includes a master device that transmits a challenge signal to a portable access device called a slave device. The master device also receives a response signal from the slave device and arrival times from a separate device called a first sniffer device. The control module of the system estimates the distance between the vehicle and the slave device or the location of the slave device based on these arrival times.
The control module is further configured to prevent access to or operational control of the vehicle based on the estimated distance or location. The first sniffer device, implemented in the vehicle, receives the challenge signal and response signal and measures the arrival times to provide accurate data for estimation. The control module can be implemented either at the master device or the first sniffer device.
The system also includes multiple sniffer devices implemented in the vehicle, such as a second sniffer device and a third sniffer device. These devices receive the challenge signal and response signal and measure the arrival times to provide additional data for estimating the location. The control module, along with the sniffer devices, estimates the location based on the arrival times provided by each device.
The system incorporates polarization diversity between the antenna modules of the master device, the first sniffer device, and a third antenna module implemented at the slave device. This diversity enhances the accuracy of the system's estimation.
Additionally, the control module can detect range extension type relay attacks performed by attacking devices. These attacks involve relaying the response signal from the slave device to the vehicle and altering it. The control module performs countermeasures in response to detecting such attacks.
The system periodically sends the challenge signal to the slave device and receives response signals, allowing for continuous monitoring and updating of the estimated distance or location.
Overall, this patented system provides a robust and secure method for accessing and controlling vehicles, preventing unauthorized access and protecting against relay attacks.