Method and system for controlling a vehicle powertrain based upon actual vehicle load

• US 7,873,452 B2
• Filed: 08/03/2007
• Issued: 01/18/2011
• Est. Priority Date: 08/03/2007
• Status: Active Grant

• Current Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Original Assignee: Detroit Diesel Corporation (Mercedes-Benz Group AG)
• Inventors: Hawkins, Jeffery Scott, Blake, Charles Chapin
• Primary Examiner(s): Tran; Khoi
• Assistant Examiner(s): Sample; Jonathan L
• Application Number:
  US11/833,268
• Publication Number:
  US 20090037047A1
• Time in Patent Office: 1,264 Days
• Field of Search: 701/36, 701/1, 701/55, 701/67, 701/103, 701/104, 177/136, 177/139, 477/70, 477/97, 477/174, 477/900
• US Class Current: 701/36
• 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 10/11 Stepped gearings
• CPC Class Codes: B60W 10/184 with wheel brakes
• CPC Class Codes: B60W 10/196 acting within the driveline, e.g. retarders
• CPC Class Codes: B60W 2530/10 Weight
• CPC Class Codes: B60W 30/1882 characterised by the working point of the engine, e.g. by using engine output chart
• CPC Class Codes: B60W 40/13 Load or weight
• CPC Class Codes: F02D 41/021 Introducing corrections for particular conditions exterior to the engine conjoint control of vehicle sub-units for propelling the vehicle B60W30/18
• CPC Class Codes: F02D 41/2422 Selective use of one or more tables
• CPC Class Codes: Y10S 477/90 Control signal is vehicle weight

Abstract

A method and system for controlling an engine controller in response to actual vehicle load.

Claims

1. A method for controlling vehicle powertrain comprising an electronically controlled engine with an ECM with memory, based upon actual vehicle load, comprising:

determining the actual vehicle weight as vehicle load;

transmitting said vehicle load over a digital communication link to multiple vehicle powertrain components;

modifying engine operating parameters based upon the actual vehicle load;

transmitting messages regarding said modified engine operating parameters over said digital communication link to be received by the powertrain components thereby changing operation of said powertrain components based upon said messages.

2. The method of claim 1, wherein said actual vehicle weight is determined by pressure sensors located in close proximity to vehicle load bearing axles;

said sensors generating signals indicative of weight and transmitting said signals to said ECM.

3. The method of claim 1, wherein said actual vehicle weight is determined by scales located in close proximity to vehicle load bearing axles;

said scales generating data signals indicative of weight and transmitting said signals over the digital communication link to said powertrain components.

4. The method of claim 1, wherein said engine operating parameters are at least one of engine torque limits, vehicle speed limits, engine speed, engine brake application force, engine brake application timing, adaptive cruise control, vehicle follow distance, and cruise control.

5. The method of claim 1, wherein said powertrain component is a transmission with a Electronic Control Unit (ECU) to modify transmission shift points, engine synchronization and clutch/gear engagement strategies based upon modified engine operating parameters in response to vehicle loading.

6. The method of claim 1, wherein said engine controller modifies an adaptive cruise system set speed or vehicle follow distance based upon vehicle load.

7. The method of claim 1, wherein engine controller sets at least one of horsepower to torque ratio (hp/tq), cruise control with engine brakes, engine brake control, engine maximum torque limits, vehicle speed limit (vsl), engine fueling in response to vehicle load.

8. The method of claim 1, wherein vehicle braking system may modify at least one of braking levels, braking timing for application of brakes;

wheel speed and vehicle speed brake thresholds based upon vehicle loading information.

9. The method of claim 1, wherein engine load based power settings are made by determining gross vehicle weight, setting hp/tq levels, setting transmission shift schedule in response to engine hp/tq, and determining engine rpm per loading on terrain.

10. A vehicle system for controlling a vehicle powertrain based upon actual vehicle load, said vehicle having at least one wheel and axle, comprising

a vehicle powertrain comprised of an electronically controlled engine having a controller with operating software and memory, a clutch, a transmission with a electronic control unit (ECU) having transmission operating software and memory, and a computer area network (CAN) for communication of data signals to all powertrain components;

and

at least one sensor in close proximity to said at least one vehicle axle to generate data signals indicative of actual vehicle weight for transmission over said digital communication link to said engine controller, said engine controller responsive to vehicle load data signals to modify engine operating parameters based upon vehicle load also wherein said modified engine parameters are transmitted over said digital communication link to the powertrain components;

wherein said vehicle load data signal is transmitted over said digital communication link to multiple powertrain components.

11. The system of claim 10, wherein said engine operating parameters include engine speed (rpm), engine torque, adaptive cruise control systems, cruise control, engine compression brakes, engine exhaust brakes, transmission retarders, engine fueling, vehicle speed limit.

12. The system of claim 10, wherein said powertrain components include at least two of an adaptive cruise system, a vehicle braking control system, an engine control system, and a transmission control system.

13. The system of claim 12, wherein said adaptive cruise system modifies at least one of cruise control set speed and vehicle follow distance based upon vehicle loading information.

14. The system of claim 12, wherein said vehicle braking system modifies at least one of vehicle braking levels, vehicle braking timing, vehicle speed brake thresholds based upon vehicle loading information.

15. The system of claim 12, wherein said engine control system modifies at least one of horsepower (hp), torque (tq), hp/tq, hp/tq cruise control with engine brakes;

maximum speed limit, engine brake control including compression brake, exhaust brake, and transmission retarder.

16. The system of claim 12, wherein said transmission modifies at least one of transmission shift points, and transmission synchronization based upon vehicle loading.