Systems, apparatus, and methods for steering a towed vehicle in reverse

Patent metadata

Field	Value
Publication number	US-11834096-B2
Application number	US-202117192858-A
Country	US
Kind code	B2
Filing date	Mar 4, 2021
Priority date	Mar 4, 2021
Publication date	Dec 5, 2023
Grant date	Dec 5, 2023

Abstract

Systems, apparatus, and methods for steering one or more wheels of a flat-towed vehicle moving in reverse. A system may include a power steering mechanism configured to steer the one or more wheels. The system may further include a connector configured to carry one or more signals from a towing vehicle to the flat-towed vehicle. The system may further include an electronic control unit (ECU) coupled to the power steering mechanism and the connector. The ECU may receive a signal that one or more reverse lights of the towing vehicle are lit or on. The ECU may be configured to actuate the power steering mechanism to steer the one or more wheels to a straight position upon receiving the signal.

First claim

What is claimed is:

1. A steering system for steering one or more wheels of a flat-towed vehicle moving in reverse, the steering system comprising:
a connector configured to carry one or more signals from a towing vehicle to the flat-towed vehicle;
a power steering mechanism configured to steer the one or more wheels independent of a tow bar connected between the towing vehicle and the flat-towed vehicle;
a sensor configured to detect an angle between a straight position and a turned position of the one or more wheels based on a steering geometry; and
an electronic control unit (ECU) coupled to the power steering mechanism, the connector, and the sensor, the ECU configured to actuate the power steering mechanism to steer the one or more wheels to a straight position with respect to the flat-towed vehicle upon receiving a signal of a plurality of signals that one or more reverse lights of the towing vehicle are on, and the ECU configured to actuate the power steering mechanism such that a requisite amount of torque is applied to steer the one or more wheels in the amount of the detected angle in an opposite direction.

2. The steering system of claim 1 , wherein the one or more wheels are one or more front wheels of the flat-towed vehicle.

3. The steering system of claim 1 , wherein the plurality of signals include brake or battery power signals.

4. The steering system of claim 1 , wherein the ECU is configured to power off the power steering mechanism upon ceasing to receive the signal.

5. The steering system of claim 1 , further comprising the tow bar configured to couple the towing vehicle to the flat-towed vehicle and move the flat-towed vehicle in reverse when the towing vehicle is moving in reverse.

6. The steering system of claim 1 , wherein power steering mechanism includes an electric motor to steer the one or more wheels.

7. The steering system of claim 1 , wherein the flat-towed vehicle has a hybrid transaxle that is splash lubricated to prevent the hybrid transaxle from drying when the one or more wheels of the flat-towed vehicle are rotating to move the flat-towed vehicle.

8. A vehicle capable of self-steering when being flat-towed in reverse by a towing vehicle, the vehicle comprising:
two or more wheels;
an axle coupled to at least one of the two or more wheels;
a power steering mechanism configured to steer at least one wheel of the two or more wheels independent of a tow bar connected between the towing vehicle and the flat-towed vehicle;
a sensor configured to detect an angle between a straight position and a turned position of the two or more wheels; and
an electronic control unit (ECU) coupled to the power steering mechanism and the sensor, the ECU configured to receive a signal that one or more reverse lights of the towing vehicle are on and actuate the power steering mechanism to steer the at least one wheel to a straight position with respect to the vehicle upon receiving the signal, and the ECU configured to actuate the power steering mechanism such that a requisite amount of torque is applied to steer the two or more wheels in the amount of the detected angle in an opposite direction.

9. The vehicle of claim 8 , wherein the signal is received from a connector coupled between the ECU and the towing vehicle.

10. The vehicle of claim 9 , wherein the signal is a first signal of a plurality of signals and the ECU is configured to receive the plurality of signals, the plurality of signals including brake or battery power signals.

11. The vehicle of claim 8 , wherein the ECU is configured to power off the power steering mechanism upon ceasing to receive the signal.

12. The vehicle of claim 8 , wherein the at least one wheel of the two or more wheels is a front wheel.

13. The vehicle of claim 8 , wherein the vehicle is coupled to the towing vehicle with a tow bar, the tow bar configured to move the vehicle in reverse when the towing vehicle is moving in reverse.

14. The vehicle of claim 8 , wherein power steering mechanism includes an electric motor to steer the one or more wheels.

15. The vehicle of claim 8 , wherein the vehicle has a hybrid transaxle that is splash lubricated to prevent the hybrid transaxle from drying when the two or more wheels are rotating to move the vehicle, wherein the hybrid transaxle includes the axle.

16. A method for steering one or more wheels of a flat-towed vehicle moving in reverse, the method comprising:
providing a power steering mechanism configured to steer the one or more wheels independent of a tow bar connected between the towing vehicle and the flat-towed vehicle;
providing a connector configured to carry one or more signals from a towing vehicle to the flat-towed vehicle;
providing a sensor configured to detect an angle between a straight position and a turned position of the one or more wheels based on a steering geometry;
receiving a signal of a plurality of signals, by an electronic control unit (ECU), that one or more reverse lights of the towing vehicle are on;
actuating, by the ECU, the power steering mechanism such that a requisite amount of torque is applied to steer the one or more wheels in the amount of the detected angle in an opposite direction; and
steering, by the power steering mechanism, the one or more wheels to a straight position with respect to the flat-towed vehicle.

17. The method of claim 16 , wherein the one or more wheels are one or more front wheels of the flat-towed vehicle.

18. The method of claim 16 , wherein the plurality of signals include brake or battery power signals.

19. The method of claim 16 , wherein the ECU is configured to power off the power steering mechanism upon ceasing to receive the signal.

20. The method of claim 16 , further comprising moving, by the tow bar, the flat-towed vehicle in reverse when the towing vehicle is moving in reverse.

Assignees

• Toyota Eng & Mfg North America

Inventors

• Robertson Stephen L

Classifications

• B62D13/06 Primary

  for backing a normally drawn trailer · CPC title

• B60D1/245

  for facilitating push back or parking of trailers · CPC title

• B62D12/02 Primary

  for vehicles operating in tandem · CPC title

• B60D1/62

  involving supply lines, electric circuits or the like · CPC title