Black box data recorder for autonomous driving vehicle
First Claim
1. A data recording unit for an autonomous driving vehicle comprising:
- a first cyclic buffer comprising a volatile memory to hold raw vehicle sensor data collected from vehicle sensors, wherein if power to the first cyclic buffer is interrupted the data held in the first cyclic buffer is lost;
a second cyclic buffer comprising non-volatile memory to hold compressed vehicle sensor data that is a compressed copy of the raw vehicle sensor data received in parallel with the raw vehicle sensor data, wherein if power to the second cyclic buffer is interrupted the data held in the second cyclic buffer is retained; and
a non-volatile storage coupled to the first cyclic buffer and the second cyclic buffer to store the raw vehicle sensor data and store the compressed vehicle sensor data, wherein in response to an event, the stored data in the first and the second cyclic buffers is moved into the non-volatile storage.
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Abstract
An improved black box data recorder for use with autonomous driving vehicles (AVD). In one embodiment, two cyclic buffers are provided to record vehicle sensors data. A first cyclic buffer records raw vehicle sensor data on a volatile memory, while a second cyclic buffer records the same vehicle sensor data, as compressed data, on a non-volatile memory. In a case of a collision or near collision, in one embodiment the buffers are flushed into a non-volatile (NV) storage for retrieval. As long as there is no power interruption, the raw vehicle sensor data will be accessible from the NV storage. If a power interruption occurs, the raw vehicle sensor data held in the volatile memory of the first cyclic buffer will be lost and only the compressed form of the vehicle sensor data from the NV second cyclic buffer will survive and be accessible.
98 Citations
17 Claims
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1. A data recording unit for an autonomous driving vehicle comprising:
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a first cyclic buffer comprising a volatile memory to hold raw vehicle sensor data collected from vehicle sensors, wherein if power to the first cyclic buffer is interrupted the data held in the first cyclic buffer is lost; a second cyclic buffer comprising non-volatile memory to hold compressed vehicle sensor data that is a compressed copy of the raw vehicle sensor data received in parallel with the raw vehicle sensor data, wherein if power to the second cyclic buffer is interrupted the data held in the second cyclic buffer is retained; and a non-volatile storage coupled to the first cyclic buffer and the second cyclic buffer to store the raw vehicle sensor data and store the compressed vehicle sensor data, wherein in response to an event, the stored data in the first and the second cyclic buffers is moved into the non-volatile storage. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of recording vehicle sensor data for an autonomous driving vehicle comprising:
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buffering raw vehicle sensor data, collected from vehicle sensors, in a first cyclic buffer comprising a volatile memory, wherein if power to the first cyclic buffer is interrupted the data held in the first cyclic buffer is lost; buffering compressed vehicle sensor data that is a compressed copy of the raw vehicle sensor data received in parallel with the raw vehicle sensor data in a second cyclic buffer comprising non-volatile memory, wherein if power to the second cyclic buffer is interrupted the data buffered in the second cyclic buffer is retained; and in response to an event, moving data held in the first and second cyclic buffers into a non-volatile storage to store the raw vehicle sensor data and store the compressed vehicle sensor data. - View Dependent Claims (8, 9, 10, 11, 12)
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13. A non-transitory machine readable medium, having stored thereon a set of instructions, which when executed, perform a method of recording vehicle sensor data for an autonomous driving vehicle, comprising:
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buffering raw vehicle sensor data, collected from vehicle sensors, in a first cyclic buffer comprising a volatile memory, wherein if power to the first cyclic buffer is interrupted the data held in the first cyclic buffer is lost; buffering compressed vehicle sensor data that is a compressed copy of the raw vehicle sensor data received in parallel with the raw vehicle sensor data in a second cyclic buffer comprising non-volatile memory, wherein if power to the second cyclic buffer is interrupted the data buffered in the second cyclic buffer is retained; and in response to an event, moving data held in the first and second cyclic buffers into a non-volatile storage to store the raw vehicle sensor data and store the compressed vehicle sensor data. - View Dependent Claims (14, 15, 16, 17)
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Specification