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US 2009/0265071 A1Published application
Vehicle control system
AssigneeDenso Corporation
InventorsKazuyoshi Isaji, Naohiko Tsuru
Life of this patent
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Abstract
In a vehicle drive control system, a control unit calculates an evaluation index indicating an approach/separation condition of a subject vehicle during a travel and stores this evaluation index together with an inter-vehicle distance with respect to each driver in a memory device. The control unit further calculates a maximum value of the stored evaluation index for each distance, and calculates a relational equation between the distance and the calculated maximum evaluation index. The control unit determines, by correcting the relational equation, a speed control start determination equation, which determines the start timing of the automatic acceleration and/or deceleration control.
Claims6
A vehicle control system comprising:
- distance detecting means configured to detect a distance from a preceding object;
- relative speed detecting means configured to detect a relative speed relative to the preceding object;
- evaluation index calculating means configured to calculate an evaluation index of the subject vehicle as an index indicating an approach/separation condition relative to the preceding object as a function of a travel speed of the preceding object, the evaluation index being increased as the relative speed of approaching the preceding object becomes higher and a rate of increase thereof being increased as the distance becomes shorter;
- memory means configured to store each evaluation index calculated during travel of the subject vehicle together with the inter-vehicle distance detected at calculation of the evaluation index;
- maximum value determining means configured to determine a maximum value of the evaluation index stored in the memory means with respect to each distance;
- relational equation determination means configured to determine a relational equation based on the maximum value, the relational equation defining the distance from the preceding object and the maximum value of the evaluation index of each distance;
- threshold equation determining means configured to determine a threshold equation by correcting the relation equation, the threshold equation defining a relation between the distance from the preceding object and a threshold of the evaluation index of each distance and determining a value, which is greater than the evaluation index determined by the relational equation;
- threshold calculating means configured to calculate a deceleration threshold based on the threshold equation and the distance from the preceding object;
- and
- control means configured to start deceleration control of the subject vehicle when the evaluation index is greater than the deceleration threshold.
7 more elements
A vehicle control system comprising:
- distance detecting means configured to detect a distance from a preceding object;
- relative speed detecting means configured to detect a relative speed relative to the preceding object;
- evaluation index calculating means configured to calculate an evaluation index during travel of the subject vehicle as an index indicating an approach/separation condition relative to the preceding object as a function of a travel speed of the preceding object, the evaluation index being increased as the relative speed of approaching the preceding object becomes higher and a rate of increase thereof being increased as the distance becomes shorter;
- memory means configured to store each evaluation index calculated during the travel of the subject vehicle together with the inter-vehicle distance detected at calculation of the evaluation index;
- maximum value determining means configured to determine a maximum value of the evaluation index stored in the memory means with respect to each distance;
- relational equation determination means configured to determine a relational equation based on the maximum value, the relational equation defining the distance from the preceding object and the maximum value of the evaluation index of each distance;
- threshold equation determining means configured to determine a threshold equation by correcting the relation equation, the threshold equation defining a relation between the distance from the preceding object and a threshold of the evaluation index of each distance and determining a value, which is less than the evaluation index determined by the relational equation;
- threshold calculating means configured to calculate an acceleration threshold based on the threshold equation and the distance from the preceding object;
- and
- control means configured to start acceleration control of the subject vehicle when the evaluation index is less than the acceleration threshold.
7 more elements
Dependencies are inferred from the claim text.