Car navigation system
First Claim
1. A car navigation system for predicting the fuel consumption rate along a found route using the fuel consumption rate information under a predetermined running condition, the system comprising:
- a test cycle characteristic value storage means for storing a test cycle characteristic value as a theoretical value of the energy consumption of selected one of the fuel and the electric energy of an automotive vehicle under the predetermined running condition;
a basic vehicle specification setting means for accepting the input of the basic vehicle specifications including at least the weight and the fuel consumption rate of the vehicle involved under the predetermined running condition;
a vehicle energy consumption characteristic calculation means for estimating an energy consumption parameter in selected one of an engine and a motor of the vehicle, using the test cycle characteristic values and the basic vehicle specifications;
an energy consumption prediction means for predicting the energy consumption in each road link using the basic vehicle specifications, the vehicle energy consumption parameter, the road link information; and
a route search means for seeking a route using, as a link cost, the predicted energy consumption for each road link calculated.
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Accused Products
Abstract
A car navigation system solves the problem that the emission test cycle fuel consumption rate indicates the energy consumption per unit distance covered following a prescribed emission test cycle procedure, and therefore, cannot produce a highly accurate prediction value reflecting the landform and the traffics along a route. So, the test cycle characteristic values independent of the vehicle model for vehicle energy consumption in a specified running condition are calculated, and the vehicle energy consumption parameter of the engine or the motor is estimated from the basic vehicle specifications such as the vehicle weight, the power supply type, the emission test cycle fuel consumption rate, the test cycle characteristic values in the emission test cycle and the vehicle characteristics. Using the basic vehicle specifications and the energy consumption parameter, the energy consumption is predicted taking the landform and traffics into consideration.
40 Citations
12 Claims
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1. A car navigation system for predicting the fuel consumption rate along a found route using the fuel consumption rate information under a predetermined running condition, the system comprising:
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a test cycle characteristic value storage means for storing a test cycle characteristic value as a theoretical value of the energy consumption of selected one of the fuel and the electric energy of an automotive vehicle under the predetermined running condition; a basic vehicle specification setting means for accepting the input of the basic vehicle specifications including at least the weight and the fuel consumption rate of the vehicle involved under the predetermined running condition; a vehicle energy consumption characteristic calculation means for estimating an energy consumption parameter in selected one of an engine and a motor of the vehicle, using the test cycle characteristic values and the basic vehicle specifications; an energy consumption prediction means for predicting the energy consumption in each road link using the basic vehicle specifications, the vehicle energy consumption parameter, the road link information; and a route search means for seeking a route using, as a link cost, the predicted energy consumption for each road link calculated. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A route search method for a car navigation system to predict the fuel consumption rate along a found route using the fuel consumption rate under a predetermined running condition, the method comprising the steps of:
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storing the test cycle characteristic value as a theoretical value of energy consumption of selected one of the fuel energy and the electric energy of an automotive vehicle under the predetermined running condition; accepting the input of the basic vehicle specifications including at least the vehicle weight and the fuel consumption rate of the vehicle involved under the predetermined running condition; estimating a vehicle energy consumption parameter in selected one of an engine and a motor of the vehicle, using the test cycle characteristic values and the basic vehicle specifications; predicting the energy consumption in each road link using the basic vehicle specifications, the vehicle energy consumption parameter and the road link information; and seeking a route using, as a link cost, the predicted energy consumption calculated for each road link.
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Specification