Method and system for torque management in hybrid vehicle

Patent metadata

Field	Value
Publication number	US-2018201250-A1
Application number	US-201715406571-A
Country	US
Kind code	A1
Filing date	Jan 13, 2017
Priority date	Jan 13, 2017
Publication date	Jul 19, 2018
Grant date	—

Abstract

Methods and systems are provided for managing torque arbitration for a hybrid powertrain. In one example, a method may include operating the hybrid powertrain over a predetermined route with a torque arbitration, and updating the torque arbitration based on a vehicle mass.

First claim

1 . A method comprising:
operating a hybrid powertrain to provide a torque to vehicle wheels over a predetermined route; and arbitrating the torque between an engine and an electric machine based on a vehicle mass.

2 . The method of claim 1 , further comprising determining the vehicle mass based on an onboard fuel amount while operating the hybrid powertrain.

3 . The method of claim 1 , further comprising determining the torque arbitration between the engine and the electric machine based on a vehicle model.

4 . The method of claim 3 , further comprising measuring an engine torque output and an electric machine torque output while operating the hybrid powertrain, and identifying the vehicle model based on the measured engine torque output, the measured electric machine torque output, and the vehicle mass.

5 . The method of claim 4 , wherein the vehicle model is identified based further on a measured vehicle velocity, a measured onboard fuel amount, and a measured battery state of charge.

6 . The method of claim 5 , further comprising determining the torque arbitration by minimizing a difference between an optimal velocity profile and a velocity profile calculated based on the identified vehicle model.

7 . The method of claim 5 , further comprising determining the arbitration by maximizing an averaged vehicle speed calculated based on the identified vehicle model.

8 . The method of claim 1 , wherein the torque is arbitrated such that an onboard fuel amount is zero at the end of the route.

9 . The method of claim 1 , wherein the torque is arbitrated such that a battery state of charge is zero at the end of the route.

10 . A method comprising:
operating a vehicle with a torque arbitration between an engine and an electric machine over a predetermined route; measuring an onboard fuel amount; and updating the torque arbitration based on the measured onboard fuel amount to maximize an averaged power to weight ratio over the predetermined route.

11 . The method of claim 10 , further comprising updating the torque arbitration based on a vehicle model, and updating parameters of the vehicle model based on the measured onboard fuel amount.

12 . The method of claim 11 , further comprising measuring a track data during vehicle operation, and updating the parameters of the vehicle model based on the measured track data.

13 . The method of claim 12 , wherein the track data includes an engine torque, an electric machine torque, a braking torque, a vehicle velocity and a battery state of charge.

14 . The method of claim 12 , wherein the torque arbitration is updated such that a vehicle profile calculated based on the updated torque arbitration approaches an optimal vehicle profile.

15 . The method of claim 12 , wherein the torque arbitration is updated such that an average vehicle speed calculated based on the updated arbitration is maximum.

16 . The method of claim 10 , further comprising updating the torque arbitration such that the onboard fuel amount is a first threshold value and a battery state of charge is a second threshold value at the end of the predetermined route.

17 . A hybrid vehicle, comprising:
a wheel, an engine coupled to the wheel; an electric machine coupled to the wheel; a brake coupled to the wheel; and a controller configured with computer readable instructions stored on non-transitory memory for: loading a torque arbitration for a route; operating the vehicle on the route by distributing a torque demand between the engine and the electric machine based on the loaded torque arbitration; measuring an onboard fuel amount while operating the vehicle; optimizing the torque arbitration based on the on board fuel amount at the end of the route; and storing the optimized torque arbitration.

18 . The hybrid vehicle of claim 17 , further comprising configuring the controller for optimizing the torque arbitration based on a vehicle model.

19 . The method of claim 18 , further comprising configuring the controller for updating the vehicle model based on the measured onboard fuel amount through system identification.

20 . The method of claim 17 , further comprising configuring the controller to operating the vehicle on the route with a braking torque equals to a driver demanded braking torque.

Assignees

• Ford Global Tech Llc

Inventors

• D'Amato Anthony Mario
• Lovett Karin
• Muddiman Mark Warren
• Pfeiffer John Jeffrey

Classifications

• B60W2530/209

  Fuel quantity remaining in tank · CPC title

• B60W2556/50

  of positioning data, e.g. GPS [Global Positioning System] data · CPC title

• B60W2552/00

  Input parameters relating to infrastructure · CPC title

• B60W50/0098

  Details of control systems ensuring comfort, safety or stability not otherwise provided for · CPC title

• B60W2050/0031

  Mathematical model of the vehicle · CPC title