System and method for improving energy efficiency of a vehicle based on known route segments

• US 9,695,760 B2
• Filed: 03/31/2014
• Issued: 07/04/2017
• Est. Priority Date: 03/31/2014
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Motor Engineering & Manufacturing North America Incorporated (Toyota Motor Corporation)
• Inventors: Dufford, Mohammad E., Payne, Joshua D.
• Primary Examiner(s): Moulis, Thomas
• Assistant Examiner(s): SCHARPF, SUSAN E
• Application Number:
  US14/230,557
• Publication Number:
  US 20150275787A1
• Time in Patent Office: 1,191 Days
• Field of Search: 701102, 1231794
• 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 2050/0075 Automatic parameter input, automatic initialising or calibrating means
• CPC Class Codes: B60W 2510/0666 Engine power
• CPC Class Codes: B60W 2510/085 Power
• CPC Class Codes: B60W 2520/10 Longitudinal speed
• CPC Class Codes: B60W 2520/105 Longitudinal acceleration
• CPC Class Codes: B60W 2556/10 Historical data
• CPC Class Codes: B60W 2556/50 of positioning data, e.g. GPS [Global Positioning System] data
• CPC Class Codes: B60W 30/18009 related to particular drive situations
• CPC Class Codes: B60W 30/18018 Start-stop drive, e.g. in a traffic jam
• CPC Class Codes: B60W 30/188 Controlling power parameters of the driveline, e.g. determining the required power
• CPC Class Codes: B60W 50/0097 Predicting future conditions
• CPC Class Codes: F02D 2200/0625 Fuel consumption, e.g. measured in fuel liters per 100 kms or miles per gallon
• CPC Class Codes: F02D 2200/501 Vehicle speed
• CPC Class Codes: F02D 2200/602 Pedal position
• CPC Class Codes: F02D 2200/701 Information about vehicle position, e.g. from navigation system or GPS signal
• CPC Class Codes: F02D 29/02 peculiar to engines driving vehicles; peculiar to engines driving variable pitch propellers
• CPC Class Codes: F02N 11/0837 Environmental conditions thereof, e.g. traffic, weather or road conditions
• CPC Class Codes: F02N 2200/123 : Information about vehicle position, e.g. from navigation systems or GPS signals
• CPC Class Codes: F02N 2300/2006 : using prediction of future conditions
• CPC Class Codes: Y02T 10/40 : Engine management systems
• CPC Class Codes: Y02T 10/84 : Data processing systems or methods, management, administration

Abstract

A method/system for maintaining the energy efficiency history of predicted route segments in a database, providing adaptive feedback to hybrid vehicle controls, and displaying the energy efficiency history to the driver. As the vehicle travels on a route, the system stores energy efficiency information for route segments. The system may include sensors, a memory, and a processor to learn energy efficiency information based on how fuel and battery power are used over a route segment and/or route. The method/system may utilize energy efficiency information to adjust a start/stop engine threshold of a hybrid vehicle. When the processor predicts that the vehicle will travels on the predicted route segment again, the vehicle may optimize powertrain parameters such as the start/stop engine threshold during traveling on the predicted route segment and/or before reaching the predicted route segment.

Claims

1. A method of optimizing energy efficiency of a vehicle with an engine and a motor, for known route segments or routes, the method comprising:

storing, in a memory, vehicle operation data for a known route segment or a known route previously travelled by the vehicle, the vehicle operation data including an energy efficiency value when the known route segment or the known route was previously travelled by the vehicle, the energy efficiency value corresponding to a power output by the engine and a power output by the motor when the known route segment or the known route was previously travelled by the vehicle;

providing a processor connected to the memory, the motor, and the engine of the vehicle;

determining, using the processor, whether the energy efficiency value is below an energy efficiency threshold;

determining or predicting, using the processor, that the vehicle will travel over the known route segment or the known route; and

adjusting, using the processor, the operation of the engine and the motor to optimize the energy efficiency of the vehicle before or when the vehicle travels over the known route segment or the known route, the adjusting including

decreasing a power output by the engine before or when the vehicle travels over the known route segment or the known route relative to the power output by the engine when the known route segment or the known route was previously travelled, and

increasing a power output by the motor before or when the vehicle travels over the known route segment relative to the power output by the motor when the known route segment or the known route was previously travelled.

2. The method of claim 1 wherein the step of adjusting, using the processor, the operation of the engine, is based on a number of starts or stops of the operation of the engine during the travelling of the vehicle on the known route segment or the known route, for decreasing or reducing energy inefficiency corresponding to frequent starting and stopping of the engine operation.

3. The method of claim 1 wherein the step of adjusting, using the processor, the operation of the engine, is based on a time period during the travelling of the vehicle on the known route segment or the known route that the engine was in an on state.

4. A method of optimizing energy efficiency of a vehicle with an engine and a motor, for known route segments or routes, the method comprising:

storing, in a memory, vehicle operation data for a known route segment or a known route previously travelled by the vehicle, the vehicle operation data including an energy efficiency value corresponding to power output by the engine and power output by the motor when the known route segment or the known route was previously travelled;

providing a processor connected to the memory, the motor, and the engine of the vehicle;

determining, using the processor, that the energy efficiency value is below an energy efficiency threshold;

determining or predicting, using the processor, that the vehicle will travel over the known route segment or the known route;

detecting, using an acceleration input sensor connected to the processor, an acceleration input value;

determining, using the processor, a power request value based on the acceleration input value; and

adjusting, using the processor, the operation of the engine based on the power request value.

5. The method of claim 4 further comprising detecting, using a vehicle speed sensor connected to the processor, a vehicle speed value,

wherein the step of adjusting, using the processor, the operation of the engine is further based on the vehicle speed value.

6. The method of claim 4 wherein the step of adjusting, using the processor, the operation of the engine is performed prior to the vehicle travelling on the known route segment or the known route.

7. The method of claim 4 wherein the step of adjusting, using the processor, the operation of the engine is performed during the vehicle travelling on the known route segment or the known route.

8. A method of optimizing energy efficiency of a vehicle, the method comprising:

storing, in a memory, a plurality of route segments and corresponding energy efficiency data, the energy efficiency data including an energy efficiency value corresponding to energy consumed by the vehicle when a route segment was previously travelled;

storing, in the memory, at least one of an engine start threshold for starting an operation of an engine or an engine stop threshold for stopping the operation of the engine;

identifying, using a processor connected to the memory, at least one route segment of the plurality of route segments;

determining, using the processor, that the corresponding energy efficiency value of the identified at least one route segment is below an energy efficiency threshold;

adjusting, using the processor, at least one of the engine start threshold or the engine stop threshold based on the corresponding energy efficiency data of the identified at least one route segment for optimizing the energy efficiency of the vehicle; and

controlling, using the processor, a power output of the engine based on the adjusted at least one of the engine start threshold or the engine stop threshold.

9. The method of claim 8 further comprising:

storing, in the memory, a vehicle speed threshold value for starting or stopping the operation of the engine;

detecting, using a vehicle speed sensor connected to the processor, a vehicle speed value; and

adjusting, using the processor, the vehicle speed threshold value based on the corresponding energy efficiency data of the identified at least one route segment for optimizing the energy efficiency of the vehicle.

10. The method of claim 9 further comprising:

detecting, using an acceleration input sensor connected to the processor, an acceleration input value;

detecting, using a vehicle speed sensor connected to the processor, a vehicle speed value; and

determining, using the processor, a power request value based on the acceleration input value and the vehicle speed value,

wherein the step of adjusting, using the processor, at least one of the engine start threshold or the engine stop threshold is further based on the power request value.

11. A system for optimizing energy efficiency of a vehicle for known route segments or routes, the system comprising:

a memory for storing vehicle operation data for a known route segment or a known route previously travelled by the vehicle, the vehicle operation data including an energy efficiency value corresponding to energy consumed by the vehicle when the known route segment or the known route was previously travelled, and an engine start threshold for starting an operation of an engine or an engine stop threshold for stopping the operation of the engine;

a processor connected to the memory and to the engine of the vehicle, the processor configured to;

determine that the energy efficiency value corresponding to energy consumed by the vehicle when the vehicle travelled over the known route segment or the known route is below an energy efficiency threshold,

determine or predict that the vehicle will travel over the known route segment or the known route,

adjust the operation of the engine to optimize the energy efficiency of the vehicle by adjusting at least one of the engine start threshold or the engine stop threshold based on the energy efficiency value when the vehicle travels over the known route segment or the known route, and

control a power output by the engine based on the adjusted at least one of the engine start threshold or the engine stop threshold.

12. The system of claim 11 wherein

the energy consumed by the vehicle includes power output of the engine and power output using a battery of the vehicle when the vehicle travelled on the known route segment or the known route.

13. The system of claim 11 further comprising an acceleration input sensor connected to the processor and configured to detect an acceleration input value, wherein

the processor is further configured to determine a power request value based on the acceleration input value, and adjust the operation of the engine further based on the power request value.

14. The system of claim 13 further comprising a vehicle speed sensor connected to the processor and configured to detect a vehicle speed value, wherein the processor is further configured to adjust the operation of the engine further based on the vehicle speed value.

15. The system of claim 11 wherein the processor is further configured to adjust at least one of the engine start threshold or the engine stop threshold based on a time period during the travelling of the vehicle on the known route segment or the known route that the engine was in an on state.