Semiconductor device and control method
First Claim
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1. A semiconductor device, comprising:
- a recognition unit that recognizes an object present in a periphery of a vehicle based on a result of an observation of the periphery of the vehicle;
a route calculation unit, connected to a distance sensor, that calculates, based on the recognized object, a travel route for the vehicle in an automatic control mode for automatically controlling the vehicle;
a mode control unit that transfers the vehicle from the automatic control mode to a manual control mode for controlling the vehicle according to an operation by a driver, when a travel route to avoid contacting with the recognized object cannot be calculated; and
a friction coefficient calculation unit that calculates a friction coefficient between the vehicle and a road surface based on a distance required for the vehicle to stop from a time when a control for braking the vehicle is started, and on a speed of the vehicle when the control for braking the vehicle is started,wherein the mode control unit calculates a braking time of the vehicle based on the calculated friction coefficient and a speed of the vehicle.
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Abstract
To achieve an accurate transfer of control from a system to a driver, a semiconductor device includes: a recognition unit that recognizes an object present in the periphery of a vehicle based on a result of observation of the periphery of the vehicle; a route calculation unit that calculates, based on the recognized object, a travel route for the vehicle in an automatic control mode for automatically controlling the vehicle; and a mode control unit that transfers the vehicle from the automatic control mode to a manual control mode for controlling the vehicle according to an operation by a driver, when a travel route to avoid the recognized object cannot be calculated.
14 Citations
17 Claims
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1. A semiconductor device, comprising:
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a recognition unit that recognizes an object present in a periphery of a vehicle based on a result of an observation of the periphery of the vehicle; a route calculation unit, connected to a distance sensor, that calculates, based on the recognized object, a travel route for the vehicle in an automatic control mode for automatically controlling the vehicle; a mode control unit that transfers the vehicle from the automatic control mode to a manual control mode for controlling the vehicle according to an operation by a driver, when a travel route to avoid contacting with the recognized object cannot be calculated; and a friction coefficient calculation unit that calculates a friction coefficient between the vehicle and a road surface based on a distance required for the vehicle to stop from a time when a control for braking the vehicle is started, and on a speed of the vehicle when the control for braking the vehicle is started, wherein the mode control unit calculates a braking time of the vehicle based on the calculated friction coefficient and a speed of the vehicle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 11, 12)
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10. A control method, comprising:
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recognizing, by a distance sensor, an object present in a periphery of a vehicle based on a result of an observation of the periphery of the vehicle; calculating a travel route for the vehicle in an automatic control mode for automatically controlling the vehicle based on the recognized object; and transferring the vehicle from the automatic control mode to a manual control mode for controlling the vehicle according to an operation by a driver, when a travel route to avoid contacting with the recognized object cannot be calculated, wherein at least in a threshold amount of time in advance of a time at which the vehicle is estimated to reach the recognized object, the mode control unit transfers the vehicle from the automatic control mode to the manual control mode, the threshold amount of time including a preparation time defined as a time required for the driver to start operating the vehicle so as to brake the vehicle, and a braking time of the vehicle calculated based on a speed of the vehicle. - View Dependent Claims (13, 14, 15, 16, 17)
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Specification