METHOD AND APPARATUS FOR CONTROLLING HYBRID ELECTRIC VEHICLE
First Claim
1. A method of controlling a hybrid electric vehicle, comprising:
- setting, by a controller, a route from a current position of the hybrid electric vehicle toward a destination;
setting, by the controller, a plurality of sections based on information regarding an altitude of the route;
calculating, by the controller, an expected driving force for each section based on a distance for each section, an average effective gradient for each section, and an average effective vehicle speed for each section;
determining, by the controller, an expected gear stage for each section based on the average effective gradient for each section and the average effective vehicle speed for each section;
calculating, by the controller, an expected demand torque of a driver for each section based on the expected driving force for each section and the expected gear stage for each section;
calculating, by the controller, an expected input speed of a transmission for each section based on the average effective vehicle speed for each section and the expected gear stage for each section;
calculating, by the controller, a demand torque of an engine for each section and a demand torque of a motor for each section from the expected demand torque of the driver for each section with reference to an optimal operating point of the engine;
calculating, by the controller, demand power of the motor for each section based on the demand torque of the motor for each section calculated with reference to the optimal operating point of the engine and the expected input speed of the transmission for each section;
calculating, by the controller, a state of charge (SOC) gain for each section based on the demand power of the motor for each section calculated with reference to the optimal operating point of the engine;
calculating, by the controller, a first virtual SOC trend line for each section based on the SOC gain for each section calculated with reference to the optimal operating point of the engine;
calculating, by the controller, an available torque of the motor for each section based on the first virtual SOC trend line and the expected input speed of the transmission for each section;
calculating, by the controller, a limit of the available torque of the motor for each section based on the expected demand torque of the driver for each section and the available torque of the motor for each section;
calculating, by the controller, an available SOC for each section based on the limit of the available torque of the motor for each section;
setting, by the controller, an objective function for minimizing accumulated work of the engine in the plurality of sections;
setting, by the controller, constraint functions of a second virtual SOC trend line to minimize the accumulated work of the engine in the plurality of sections, an expected demand torque of the motor for each section, an expected demand torque of the engine, and accumulated driving work in the plurality of sections;
determining, by the controller, design variables that satisfy the objective function and the constraint functions, wherein the design variables include the second virtual SOC trend line, the expected demand torque of the motor for each section, and the accumulated work of the motor in the plurality of sections;
calculating, by the controller, the expected demand torque of the engine for each section based on the expected demand torque of the driver for each section and the expected demand torque of the motor for each section;
determining, by the controller, an expected driving mode of the hybrid electric vehicle for each section based on the expected demand torque of the driver for each section, the expected demand torque of the engine for each section, and the expected demand torque of the motor for each section;
determining, by the controller, a first threshold line and a second threshold line based on the second virtual SOC trend line, the average effective gradient for each section, and the average effective vehicle speed for each section; and
operating, by the controller, the engine and the motor using the expected driving mode of the hybrid electric vehicle, the first threshold line, and the second threshold line.
1 Assignment
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Accused Products
Abstract
A method and an apparatus for controlling a hybrid electric vehicle are provided. The apparatus includes a navigation device that provides information regarding a gradient, a speed limit, and a traffic speed of a road. An accelerator pedal position detector detects a position of an accelerator pedal and a brake pedal position detector detects a position of a brake pedal. A vehicle speed detector detects a vehicle speed, a state of charge (SOC) detector detects an SOC of a battery, and a gear stage detector detects a gear stage that is currently engaged. A controller operates the hybrid vehicle based on signals of the navigation device, the accelerator pedal position detector, the brake pedal position detector, the vehicle speed detector, the SOC detector, and the gear stage detector.
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Citations
18 Claims
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1. A method of controlling a hybrid electric vehicle, comprising:
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setting, by a controller, a route from a current position of the hybrid electric vehicle toward a destination; setting, by the controller, a plurality of sections based on information regarding an altitude of the route; calculating, by the controller, an expected driving force for each section based on a distance for each section, an average effective gradient for each section, and an average effective vehicle speed for each section; determining, by the controller, an expected gear stage for each section based on the average effective gradient for each section and the average effective vehicle speed for each section; calculating, by the controller, an expected demand torque of a driver for each section based on the expected driving force for each section and the expected gear stage for each section; calculating, by the controller, an expected input speed of a transmission for each section based on the average effective vehicle speed for each section and the expected gear stage for each section; calculating, by the controller, a demand torque of an engine for each section and a demand torque of a motor for each section from the expected demand torque of the driver for each section with reference to an optimal operating point of the engine; calculating, by the controller, demand power of the motor for each section based on the demand torque of the motor for each section calculated with reference to the optimal operating point of the engine and the expected input speed of the transmission for each section; calculating, by the controller, a state of charge (SOC) gain for each section based on the demand power of the motor for each section calculated with reference to the optimal operating point of the engine; calculating, by the controller, a first virtual SOC trend line for each section based on the SOC gain for each section calculated with reference to the optimal operating point of the engine; calculating, by the controller, an available torque of the motor for each section based on the first virtual SOC trend line and the expected input speed of the transmission for each section; calculating, by the controller, a limit of the available torque of the motor for each section based on the expected demand torque of the driver for each section and the available torque of the motor for each section; calculating, by the controller, an available SOC for each section based on the limit of the available torque of the motor for each section; setting, by the controller, an objective function for minimizing accumulated work of the engine in the plurality of sections; setting, by the controller, constraint functions of a second virtual SOC trend line to minimize the accumulated work of the engine in the plurality of sections, an expected demand torque of the motor for each section, an expected demand torque of the engine, and accumulated driving work in the plurality of sections; determining, by the controller, design variables that satisfy the objective function and the constraint functions, wherein the design variables include the second virtual SOC trend line, the expected demand torque of the motor for each section, and the accumulated work of the motor in the plurality of sections; calculating, by the controller, the expected demand torque of the engine for each section based on the expected demand torque of the driver for each section and the expected demand torque of the motor for each section; determining, by the controller, an expected driving mode of the hybrid electric vehicle for each section based on the expected demand torque of the driver for each section, the expected demand torque of the engine for each section, and the expected demand torque of the motor for each section; determining, by the controller, a first threshold line and a second threshold line based on the second virtual SOC trend line, the average effective gradient for each section, and the average effective vehicle speed for each section; and operating, by the controller, the engine and the motor using the expected driving mode of the hybrid electric vehicle, the first threshold line, and the second threshold line. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. An apparatus for controlling a hybrid electric vehicle, comprising:
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a navigation device configured to provide information regarding a road gradient, a speed limit, and a traffic speed of a road; an accelerator pedal position detector configured to detect a position of an accelerator pedal; a brake pedal position detector configured to detect a position of a brake pedal; a vehicle speed detector configured to detect a vehicle speed; a state of charge (SOC) detector configured to detect an SOC of a battery; a gear stage detector configured to detect a currently engaged gear stage; and a controller configured to operate the hybrid vehicle based on signals of the navigation device, the accelerator pedal position detector, the brake pedal position detector, the vehicle speed detector, the SOC detector, and the gear stage detector, wherein the controller is further configured to; set a route from a current position of the hybrid electric vehicle toward a destination; set a plurality of sections based on information regarding an altitude of the route; calculate an expected driving torque for each section based on a distance for each section, an average effective gradient for each section, and an average effective vehicle speed for each section; determine an expected gear stage for each section based on the average effective gradient for each section and the average effective vehicle speed for each section; calculate an expected demand torque of a driver for each section based on the expected driving torque for each section and the expected gear stage for each section; calculate an expected input speed of a transmission for each section based on the average effective vehicle speed for each section and the expected gear stage for each section; calculate a demand torque of an engine for each section and a demand torque of a motor for each section from the expected demand torque of the driver for each section with reference to an optimal operating point of the engine; calculate a demand power of the motor for each section based on the demand torque of the motor for each section calculated with reference to the optimal operating point of the engine and the expected input speed of the transmission for each section; calculate a state of charge (SOC) gain for each section based on the demand power of the motor for each section calculated with reference to the optimal operating point of the engine; calculate a first virtual SOC trend line for each section based on the SOC gain for each section calculated with reference to the optimal operating point of the engine; calculate an available torque of the motor for each section based on the first virtual SOC trend line and the expected input speed of the transmission for each section; calculate a limit of the available torque of the motor for each section based on the expected demand torque of the driver for each section and the available torque of the motor for each section; calculate an available SOC for each section based on the limit of the available torque of the motor for each section; set an objective function to minimize accumulated work of the engine in the plurality of sections; set constraint functions of a second virtual SOC trend line to minimize the accumulated work of the engine in the plurality of sections, an expected demand torque of the motor for each section, an expected demand torque of the engine, and accumulated driving work in the plurality of sections; determine design variables that satisfy the objective function and the constraint functions, wherein the design variables includes the second virtual SOC trend line, the expected demand torque of the motor for each section, and the accumulated work of the motor in the plurality of sections; calculate the expected demand torque of the engine for each section based on the expected demand torque of the driver for each section and the expected demand torque of the motor for each section; determine an expected driving mode of the hybrid electric vehicle for each section based on the expected demand torque of the driver for each section, the expected demand torque of the engine for each section, and the expected demand torque of the motor for each section; determine a first threshold line and a second threshold line based on the second virtual SOC trend line, the average effective gradient for each section, and the average effective vehicle speed for each section; and operate the engine and the motor by using the expected driving mode of the hybrid electric vehicle, the first threshold line, and the second threshold line. - View Dependent Claims (16, 17, 18)
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Specification