Vehicle driving recorder, vehicle travel analyzer and storage medium
First Claim
1. A vehicle travel analyzer comprising:
- measured data acquiring means for acquiring angular velocity data and acceleration data measured in time sequence relative to axes of a plurality of dimensions at a given position in a vehicle;
measured data correcting means for removing a drift component contained in the acquired angular velocity data; and
historical data producing means for deriving travel attitude angles of the vehicle from the angular velocity data without said drift component, deriving velocities of the vehicle along the axes of the dimensions from said travel attitude angles and said acquired acceleration data, and producing historical data of said derived travel attitude angles and velocities of the vehicle;
wherein said measured data correcting means compares an angular component derived by periodically intergrating said acquired angular velocity data and an angular component derived from said acquired acceleration data in a stopped state of the vehicle so as to derive a rate of occurrence of drift contained in said angular velocity data, and wherein said measured data correcting means removes said drift component from said angular velocity data based on said drift occurrence rate.
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Accused Products
Abstract
In a driving recorder, angular velocity data and acceleration data of a vehicle are sequentially measured and stored into a memory along with time information, thereby updating the data stored in the memory in sequence. If a shock due to crash or the like occurs at the vehicle, a given time period is set for further data storage. When the time is up, the data storage into the memory is stopped. Thus, the memory holds at least the angular velocity data and the acceleration data for the set time period after detection of the occurrence of shock and for a given time period before detection of the occurrence of shock. Upon analysis, a travel analyzer is connected to the driving recorder for reading out the data stored in the memory. Based on the read-out data, the travel analyzer produces data representing a travel history of the vehicle and visually expresses such travel history data.
330 Citations
16 Claims
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1. A vehicle travel analyzer comprising:
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measured data acquiring means for acquiring angular velocity data and acceleration data measured in time sequence relative to axes of a plurality of dimensions at a given position in a vehicle; measured data correcting means for removing a drift component contained in the acquired angular velocity data; and historical data producing means for deriving travel attitude angles of the vehicle from the angular velocity data without said drift component, deriving velocities of the vehicle along the axes of the dimensions from said travel attitude angles and said acquired acceleration data, and producing historical data of said derived travel attitude angles and velocities of the vehicle; wherein said measured data correcting means compares an angular component derived by periodically intergrating said acquired angular velocity data and an angular component derived from said acquired acceleration data in a stopped state of the vehicle so as to derive a rate of occurrence of drift contained in said angular velocity data, and wherein said measured data correcting means removes said drift component from said angular velocity data based on said drift occurrence rate. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A vehicle travel analyzer comprising:
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measured data acquiring means for acquiring angular velocity data and acceleration data measured in time sequence relative to axes of a plurality of dimensions at a given position in a vehicle; measured data correcting means for removing a drift component contained in the acquired angular velocity data; and historical data producing means for deriving travel attitude angles of the vehicle from the angular velocity data without said drift component, deriving velocities of the vehicle along the axes of the dimensions from said travel attitude angles and said acquired acceleration data, and producing historical data of said derived travel attitude angles and velocities of the vehicle; wherein said measured data correcting means accumulates said acquired angular velocity data measured in a stopped state of the vehicle so as to derive a tendency of occurrence of drift contained in said angular velocity data, and wherein said measured data correcting means removes said drift component from said angular velocity data based on said drift occurrence tendency. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A vehicle driving recorder comprising:
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a sensor section for measuring angular velocity data and acceleration data in time sequence relative to axes of a plurality of dimensions at a given position in a vehicle; measured data correcting means for comparing an angular component derived by periodically integrating the measured angular velocity data and an angular component derived from the measured acceleration data in a stopped state of the vehicle so as to derive a rate of occurrence of drift contained in the measured angular velocity data, and for removing a drift component from the measured angular velocity data based on said drift occurrence rate; a nonvolatile memory; and memory control means for sequentially storing measured data including the angular velocity data free of said drift component and the acceleration data into said memory so as to update the measured data stored in said memory and for, upon detection of a command inputted from an external device, reading the measured data stored in said memory and transferring them to said external device.
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16. A computer-readable storage medium storing a functional descriptive material, said functional descriptive material causing a computer to execute the steps of:
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acquiring angular velocity data and acceleration data measured in time sequence relative to axes of a plurality of dimensions at a given position in a vehicle; comparing an angular component derived by periodically integrating the acquired angular velocity data and an angular component derived from the acquired acceleration data in a stopped state of the vehicle so as to derive a rate of occurrence of drift contained in the acquired angular velocity data; removing a drift component from the acquired angular velocity data based on said drift occurrence rate; and deriving travel attitude angles of the vehicle from the angular velocity data free of said drift component and velocities of the vehicle along the axes of the plurality of dimensions from said travel attitude angles and said acquired acceleration data so as to produce historical data of said derived travel attitude angles and velocities of the vehicle.
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Specification