Drafting detection and vehicle operation optimization system

Patent metadata

Field	Value
Publication number	US-10059330-B2
Application number	US-201615273571-A
Country	US
Kind code	B2
Filing date	Sep 22, 2016
Priority date	Sep 22, 2016
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A system for improving performance or efficiency of operation of a vehicle. The system includes a sensor configured to detect current vehicle speed data and current vehicle slope data. The system includes a pedal control unit configured to detect current pedal position data. The system includes an electronic control unit (ECU) configured to determine expected driving power demand based on current vehicle speed data and vehicle slope data. The ECU is configured to determine detected driving power demand based on current pedal position data. The ECU is configured to detect a drafting condition when the expected driving power demand exceeds the detected driving power demand. The ECU is configured to adjust, when the drafting condition is detected, at least one of a chassis control setting, an engine control setting, a transmission control setting, or a hybrid control setting to improve performance or efficiency of operation of the vehicle.

First claim

What is claimed is:

1. A system for improving a performance or an efficiency of operation of a vehicle experiencing reduced aerodynamic loading due to driving behind a lead vehicle, the system comprising:
a first sensor configured to detect current vehicle speed data;
a second sensor configured to detect current vehicle slope data;
a third sensor configured to detect spatial data indicating distance to the lead vehicle;
a pedal control unit configured to detect current pedal position data; and
an electronic control unit (ECU) configured to:
determine an expected driving power demand based on the current vehicle speed data and the current vehicle slope data,
determine a detected driving power demand based on the current pedal position data,
detect a drafting condition when the expected driving power demand exceeds the detected driving power demand and when the spatial data indicates the vehicle is within a proximity of the lead vehicle, and
adjust, when the drafting condition is detected, at least one of a chassis control setting, an engine control setting, a transmission control setting, or a hybrid control setting to improve the performance or the efficiency of operation of the vehicle.

2. The system of claim 1 , wherein the drafting condition is detected when the expected driving power demand exceeds the detected driving power demand by a demand difference percentage threshold.

3. The system of claim 2 , wherein the drafting condition is determined when the expected driving power demand exceeds the detected driving power demand for a period of time exceeding a demand difference time threshold.

4. The system of claim 1 , wherein adjusting the chassis control setting includes at least one of adjusting grille shutters to improve vehicle aerodynamics to improve the performance or the efficiency of operation of the vehicle, adjusting cooling air flow from a vehicle engine to one or more other vehicle components to improve the performance or the efficiency of operation of the vehicle, adjusting vehicle height to improve vehicle aerodynamics to improve the performance or the efficiency of operation of the vehicle, or adjusting vehicle spoiler position to improve vehicle aerodynamics to improve the performance or the efficiency of operation of the vehicle.

5. The system of claim 1 , wherein adjusting the engine control setting includes at least one of adjusting spark plug ignition timing to increase fuel efficiency to improve the performance or the efficiency of operation of the vehicle, adjusting air-to-fuel ratio to increase fuel efficiency to improve the performance or the efficiency of operation of the vehicle, or adjusting exhaust gas recirculation to improve vehicle emissions to improve the performance or the efficiency of operation of the vehicle.

6. The system of claim 1 , wherein adjusting the transmission control setting includes at least one of adjusting shift controls to increase fuel efficiency to improve the performance or the efficiency of operation of the vehicle, locking a torque converter to increase fuel efficiency to improve the performance or the efficiency of operation of the vehicle, or adjusting a transmission mode to increase fuel efficiency to improve the performance or the efficiency of operation of the vehicle.

7. The system of claim 1 , wherein adjusting the hybrid control setting includes adjusting a hybrid mode transition threshold to increase use of an electric operation mode to increase fuel efficiency to improve the performance or the efficiency of operation of the vehicle.

8. The system of claim 1 , wherein the electronic control unit is further configured to:
determine an updated expected driving power demand based on updated vehicle speed data and updated vehicle slope data;
determine an updated detected driving power demand based on updated pedal position data;
detect a change from the drafting condition to a non-drafting condition when the updated expected driving power demand does not exceed the updated detected driving power demand; and
temporarily increase driving power when the change from the drafting condition to the non-drafting condition is detected, to mitigate effects of increased aerodynamic loading caused by the change from the drafting condition to the non-drafting condition.

9. A vehicle comprising:
a first sensor configured to detect current vehicle speed data;
a second sensor configured to detect current vehicle slope data;
a third sensor configured to detect spatial data indicating distance to a lead vehicle; and
an electronic control unit (ECU) configured to:
determine an expected driving power demand based on the current vehicle speed data and the current vehicle slope data,
determine a current driving power demand,
detect a drafting condition when the expected driving power demand exceeds the current driving power demand and when the spatial data indicates the vehicle is within a proximity of the lead vehicle, and
adjust, when the drafting condition is detected, at least one of a chassis control setting, an engine control setting, a transmission control setting, or a hybrid control setting.

10. The vehicle of claim 9 , wherein the current driving power demand is determined based on an autonomous driving protocol for controlling the vehicle.

11. The vehicle of claim 9 , wherein the current driving power demand is determined based on current pedal position data detected by a pedal control unit.

12. The vehicle of claim 9 , wherein the drafting condition is detected when the expected driving power demand exceeds the detected driving power demand by a demand difference percentage threshold for a period of time exceeding a demand difference time threshold.

13. The vehicle of claim 9 , wherein adjusting the chassis control setting includes at least one of adjusting grille shutters to improve vehicle aerodynamics, adjusting cooling air flow from a vehicle engine to one or more other vehicle components, adjusting vehicle height to improve vehicle aerodynamics, or adjusting vehicle spoiler position to improve vehicle aerodynamics.

14. The vehicle of claim 9 , wherein adjusting the engine control setting includes at least one of adjusting spark plug ignition timing to increase fuel efficiency, adjusting air-to-fuel ratio to increase fuel efficiency, or adjusting exhaust gas recirculation to improve vehicle emissions.

15. The vehicle of claim 9 , wherein adjusting the transmission control setting includes at least one of adjusting shift controls to increase fuel efficiency, locking a torque converter to increase fuel efficiency, or adjusting a transmission mode to increase fuel efficiency.

16. The vehicle of claim 9 , wherein adjusting the hybrid control setting includes adjusting a hybrid mode transition threshold to increase use of an electric operation mode to increase fuel efficiency.

17. A method for improving a performance or an efficiency of operation of a vehicle experiencing reduced aerodynamic loading due to driving behind a lead vehicle, the method comprising:
detecting, by a first sensor, current vehicle speed data;
detecting, by a second sensor, current vehicle slope data;
detecting, by a third sensor, spatial data indicating distance to the lead vehicle;
detecting, by a pedal control unit, current pedal position data;
determining, by an electronic control unit (ECU), an expected driving power demand based on the current vehicle speed data and the current vehicle slope data;
determining, by the ECU, a detected driving power demand based on the current pedal position data;
detecting, by the ECU,

Assignees

• Toyota Eng & Mfg North America

Inventors

• Gaither Geoffrey D
• Aoki Takanori

Classifications

• B60W2540/10

  Accelerator pedal position · CPC title

• B60W2520/10

  Longitudinal speed · CPC title

• B60G17/01908

  Acceleration or inclination sensors (characterised by the use of gyroscopes B60G21/08) · CPC title

• B60W10/10

  including control of change-speed gearings · CPC title

• B60W30/188

  Controlling power parameters of the driveline, e.g. determining the required power · CPC title