David B Clifford

US Patent:

20210088340, Mar 25, 2021

Filed:

Sep 25, 2019

Appl. No.:

16/582672

Inventors:

- Detroit MI, US
Sheetal Mahesh - Pflugerville TX, US
Yehenew G. Mengistu - Sterling Heights MI, US
David H. Clifford - Royal Oak MI, US

Assignee:

GM GLOBAL TECHNOLOGY OPERATIONS LLC - Detroit MI

International Classification:

G01C 21/32
G06K 9/00
G06T 7/70
H04W 4/44
G06T 19/00

Abstract:

A system for inferring lane boundaries via vehicle telemetry for a road section is provided. The system includes a computerized remote server device operable to receive through a communications network sensor data describing lane markings upon roads bordering the road section, determine established lanes upon roads bordering the road section based upon the sensor data, receive through the communications network the vehicle telemetry generated by a plurality of vehicles traversing the road section, generate inferred lanes for the road section based upon the vehicle telemetry, match the inferred lanes to the established lanes to generate unified lane geometries, and publish the unified lane geometries.

US Patent:

20210041880, Feb 11, 2021

Filed:

Aug 6, 2019

Appl. No.:

16/533274

Inventors:

- Detroit MI, US
Sheetal Mahesh - Pflugerville TX, US
Yehenew G. Mengistu - Sterling Heights MI, US
Mason D. Gemar - Austin TX, US
David H. Clifford - Royal Oak MI, US

International Classification:

G05D 1/02
G06N 20/10
G06N 5/04
G05B 13/02
G05D 1/00
B60W 40/072

Abstract:

System and methods for estimating a centerline of a road that separates traffic moving in opposite directions include aggregating a data set from each of a plurality of vehicles traversing the road over a period of time as telemetry data. Each data set of the telemetry data indicates a location and a heading. The method includes clustering the data sets of the telemetry data based on the heading indicated by each data set, and identifying a separator to separate the data sets indicating a first heading from the data sets indicating a second heading, opposite to the first heading. The centerline is estimated based on applying a spatial smoothing to the separator.

US Patent:

20190259274, Aug 22, 2019

Filed:

Feb 22, 2018

Appl. No.:

15/902406

Inventors:

- Detroit MI, US
Daniel J. Fagnant - Austin TX, US
Mason D. Gemar - Cedar Park TX, US
David H. Clifford - Royal Oak MI, US
Geoffrey Wakefield - Lakeway TX, US

Assignee:

General Motors LLC - Detroit MI

International Classification:

G08G 1/01
H04L 29/08
H04L 29/06
H04W 4/44
H04W 4/46

Abstract:

At least one transceiver is configured to wirelessly receive a unique identifier (ID) of a source node that is external to a vehicle. A distributed ledger includes a list of unique IDs associated with trusted source nodes. An ID comparison module is configured to compare the unique ID of the source node with the list. The at least one transceiver is configured to, in response to a determination that the unique ID of the source node is not within the list, wirelessly transmit the unique ID of the source node the trusted source nodes of a connected network for execution of a consensus algorithm. A ledger management module is configured to, in response to a determination to trust the source node via execution of the consensus algorithm, add the unique ID of the source node to the list.