METHOD OF CONTROLLING COASTING OPERATION OF HYBRID VEHICLE AND APPARATUS FOR PERFORMING THE SAME

• US 20160121898A1
• Filed: 09/01/2015
• Published: 05/05/2016
• Est. Priority Date: 10/31/2014
• Status: Abandoned Application

• Current Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Original Assignee: Hyundai Motor Company (Hyundai Motor Group)
• Inventors: Jo, Kyu Hwan, Kim, Sang Joon, Yang, Dong Ho, Park, Joon Young, Yoon, Dong Pil
• Application Number:
  US14/841,933
• Publication Number:
  US 20160121898A1
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60W 10/02 including control of driveline clutches
• CPC Class Codes: B60W 10/06 including control of combustion engines
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 20/12 using control strategies taking into account route information estimation or calculation of non-directly measurable driving parameters B60W40/00
• CPC Class Codes: B60W 2030/18081 With torque flow from driveshaft to engine, i.e. engine being driven by vehicle
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: B60W 2555/60 Traffic rules, e.g. speed limits or right of way
• CPC Class Codes: B60W 2556/50 of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: B60W 2710/083 Torque
• CPC Class Codes: B60W 2720/10 Longitudinal speed
• CPC Class Codes: B60W 30/18072 Coasting
• CPC Class Codes: B60W 30/18127 Regenerative braking
• CPC Class Codes: B60W 30/18136 Engine braking
• CPC Class Codes: B60W 50/0097 Predicting future conditions
• CPC Class Codes: Y02T 10/60 Other road transportation technologies with climate change mitigation effect
• CPC Class Codes: Y02T 10/62 Hybrid vehicles
• CPC Class Codes: Y10S 903/903 having energy storing means, e.g. battery, capacitor

Abstract

A method of controlling coasting operation of a hybrid vehicle during a coasting operation and an apparatus for performing the same are provided. The coasting operation is controlled by calculating a remaining distance from a current location of a vehicle and a location at a target vehicle speed and an approach distance until reaching the target vehicle speed demanded at a current vehicle speed. Additionally, an inertia torque is adjusted to correspond to vehicle variation based on roads, slopes of the roads, and exterior disturbances. Thus, since inertia torque is adjusted during the coasting operation based on the target vehicle speed, unnecessary energy loss is reduced and fuel ratio is enhanced during traveling on roads.

Claims

1. An apparatus for controlling a coasting operation of a vehicle, the apparatus comprising:

an audio, video, and navigator (AVN) unit configured to monitor a traveling path of the vehicle and road information;

a driving unit configured to add and reduce an inertia torque; and

a controller configured to receive information monitored by the AVN unit and a sensor unit, calculate a remaining distance to a location of a target vehicle speed, an approach distance demanded from a current vehicle speed to the target vehicle speed through a preset coasting operation line, a difference between the approach distance and the remaining distance during performance of the coasting operation, and perform an inertia torque adding and reducing control when the difference is greater than a preset value.

2. The apparatus of claim 1, wherein in the calculation of the approach distance by the controller, the controller is configured to calculate the approach distance using data of a difference between a coasting operation distance demanded from the current vehicle speed to when the vehicle stops by the coasting operation line preset in the controller and a coasting operation distance demanded from the target vehicle speed to when the vehicle stops.

3. The apparatus of claim 1, wherein the inertia torque adding and reducing control is performed based on following equation:

4. The apparatus of claim 3, wherein the controller is configured to decelerate the vehicle by increasing the inertia torque when the approach distance is greater than the remaining distance during the performance of the inertia torque adding and reducing control.

5. The apparatus of claim 3, wherein the controller is configured to accelerate the vehicle by reducing the inertia torque when the approach distance is less than the remaining distance during the inertia torque adding and reducing control.

6. The apparatus of claim 5, wherein the controller is configured to decrease a charging amount of a motor or engage an engine clutch to reduce the inertia torque during the performance of the inertia torque adding and reducing control.

7. The apparatus of claim 1, wherein the sensor unit is configured to monitor the vehicle speed and whether an accelerator pedal is engaged.

8. A method of controlling a coasting operation of a vehicle, the method comprising:

calculating, by a controller, a coating operation distance based on a current vehicle speed;

calculating, by the controller, a remaining distance from a location at a current vehicle speed and a location at a target vehicle speed and an approach distance demanded from the current vehicle speed to the target vehicle speed during the coasting operation;

determining, by the controller, whether a difference between the remaining distance and the approach distance is less than a first preset value;

calculating, by the controller, the remaining distance when the difference between the remaining distance and the approach distance is greater than the first preset value and determining whether an accelerator pedal is engaged when the different between the remaining distance and the approach distance is less than the first preset value; and

calculating, by a controller, a coating operation when the difference between the remaining distance and the approach distance is greater than the first preset value, performing an inertia torque adding and reducing control when the different between the remaining distance and the approach distance is less than the first preset value and an absolute value of the difference between the approach distance and the remaining distance is greater than a second preset value, and maintaining a current coasting operation control when the absolute value of the difference between the approach distance and the remaining distance is less than a preset critical value.

9. The method of claim 8, wherein in the calculation of the demanded from the current vehicle speed to the target vehicle speed during the coasting operation, the approach distance is calculated using a difference between a coasting operation distance demanded from the current vehicle speed to when the vehicle stops by a coasting operation line preset in the controller and a coasting operation distance demanded from the target vehicle speed to when the vehicle stops.

10. The method of claim 8, wherein when the absolute value of the difference between the approach distance and the remaining distance is greater than the second preset value, the inertia torque adding and reducing control is performed by the controller according to following equation:

11. The method of claim 8, wherein when the absolute value of the difference between the approach distance and the remaining distance is greater than the second preset value, the performance of the inertia torque adding and reducing control includes:

increasing, by the controller, an inertia torque to decelerate the vehicle when the difference between the approach distance and the remaining distance is greater than zero.

12. The method of claim 8, wherein when the absolute value of the difference between the approach distance and the remaining distance is greater than the second preset value, the performance of the inertia torque adding and reducing control includes:

reducing, by the controller, the inertia torque to decelerate the vehicle when the difference between the approach distance and the remaining distance is less than zero.

13. The method of claim 12, wherein the inertial torque is reduced by increasing a charging amount of a motor or by engaging an engine clutch.

14. A non-transitory computer readable medium containing program instructions executed by a controller, the computer readable medium comprising:

program instructions that calculate a coating operation distance based on a current vehicle speed;

program instructions that calculate a remaining distance from a location at a current vehicle speed and a location at a target vehicle speed and an approach distance demanded from the current vehicle speed to the target vehicle speed during the coasting operation;

program instructions that determine whether a difference between the remaining distance and the approach distance is less than a first preset value;

program instructions that calculate the remaining distance when the difference between the remaining distance and the approach distance is greater than the first preset value and determining whether an accelerator pedal is engaged when the different between the remaining distance and the approach distance is less than the first preset value; and

program instructions that calculate a coating operation when the difference between the remaining distance and the approach distance is greater than the first preset value, perform an inertia torque adding and reducing control when the different between the remaining distance and the approach distance is less than the first preset value and an absolute value of the difference between the approach distance and the remaining distance is greater than a second preset value, and maintain a current coasting operation control when the absolute value of the difference between the approach distance and the remaining distance is less than a preset critical value.

15. The non-transitory computer readable medium of claim 14, wherein in the calculation of the demanded from the current vehicle speed to the target vehicle speed during the coasting operation, the approach distance is calculated using a difference between a coasting operation distance demanded from the current vehicle speed to when the vehicle stops by a coasting operation line preset in the controller and a coasting operation distance demanded from the target vehicle speed to when the vehicle stops.