Vehicle/engine acceleration rate management system

• US 6,021,370 A
• Filed: 08/05/1997
• Issued: 02/01/2000
• Est. Priority Date: 08/05/1997
• Status: Expired due to Term

• Current Assignee: Cummins Incorporated
• Original Assignee: Cummins Incorporated
• Inventors: Shoemaker, John, Workman, Matthew W., Bellinger, Steven M., Kresse, John P.
• Primary Examiner(s): Nelli, Raymond A.
• Application Number:
  US08/905,990
• Time in Patent Office: 910 Days
• Field of Search: 701/110, 701/93, 364/431.07, 364/431.08, 73/116, 73/118.1
• US Class Current: 701/110
• CPC Class Codes: B60K 31/047 the memory being digital
• CPC Class Codes: B60W 2510/1005 Transmission ratio engaged
• CPC Class Codes: B60W 2520/105 Longitudinal acceleration
• CPC Class Codes: B60W 2720/106 Longitudinal acceleration
• CPC Class Codes: F02D 41/0225 in relation with the gear ratio or shift lever position
• CPC Class Codes: F02D 41/10 for acceleration
• CPC Class Codes: F16H 63/50 Signals to an engine or motor

Abstract

A vehicle/engine acceleration rate management system includes means for determining vehicle acceleration rate and a control computer providing a fueling signal to an internal combustion engine fueling system. The control computer is responsive to a gear ratio signal indicative of one of a plurality of selectable transmission gear ratios currently engaged with the engine and a vehicle acceleration rate signal to control the vehicle acceleration rate by limiting the fueling signal whenever the vehicle acceleration rate signal exceeds a vehicle acceleration limit function. In one embodiment, such vehicle acceleration rate limiting is performed only for vehicle speeds above a threshold vehicle speed, and an identical engine acceleration rate limiting procedure is performed at vehicle speeds below the threshold vehicle speed. In either case, such acceleration rate limiting is preferably only performed under manual control of engine fueling via an accelerator pedal or the like.

Claims

1. A vehicle acceleration rate management system comprising:

means for determining acceleration rate of a vehicle and producing a vehicle acceleration signal corresponding thereto;

a memory storing a vehicle acceleration limit function therein;

a fuel system responsive to a fueling signal to provide fuel to an internal combustion engine of the vehicle; and

a control computer producing said fueling signal, said control computer responsive to said vehicle acceleration signal and said vehicle acceleration limit function to control vehicle acceleration by limiting said fueling signal whenever said vehicle acceleration signal exceeds said vehicle acceleration limit function.

2. The vehicle acceleration rate management system of claim 1 further including:

an accelerator responsive to manual actuation thereof to produce an accelerator signal;

and wherein said control computer is operable to generate a torque request signal independently of said accelerator signal, said computer responsive to either of said accelerator signal and said torque request signal to produce said fueling signal, said control computer limiting said fueling signal only when said fueling signal is produced in accordance with said accelerator signal.

3. The vehicle acceleration rate management system of claim 1 further including:

a transmission connected to said internal combustion engine and having a number of selectable gear ratios engageable with said engine; and

means for determining a currently engaged gear ratio and producing a gear ratio signal corresponding thereto;

wherein said memory unit includes a number of vehicle acceleration limit functions stored therein, each of said number of vehicle acceleration limit functions corresponding to one or more of said number of selectable gear ratios;

and wherein said control computer is responsive to said gear ratio signal to limit said fueling signal in accordance with a corresponding one of said number of vehicle acceleration limit functions.

4. The vehicle acceleration rate management system of claim 1 further including:

means for sensing vehicle speed and producing a vehicle speed signal corresponding thereto;

wherein said vehicle acceleration limit function includes a number of vehicle acceleration limit values each corresponding to one of a number of vehicle speed ranges;

and wherein said control computer is responsive to said vehicle speed signal to determine a corresponding one of said number of vehicle speed ranges and select a corresponding one of said number of vehicle acceleration limit values, said control computer limiting said fueling signal in accordance with said selected one of said number of vehicle acceleration limit values.

5. The vehicle acceleration rate management system of claim 1 wherein said means for determining vehicle acceleration includes:

means for sensing vehicle speed and producing a first vehicle speed signal corresponding thereto; and

means within said control computer for converting said vehicle speed signal to said vehicle acceleration signal.

6. The vehicle acceleration rate management system of claim 5 wherein said control computer includes:

means for converting said vehicle acceleration limit function to a vehicle speed limit function; and

means for converting said vehicle acceleration signal to a second vehicle speed signal;

and wherein said control computer is responsive to said vehicle speed limit function and said second vehicle speed signal to control vehicle acceleration by limiting said fueling signal to said predefined fueling function whenever said second vehicle speed signal exceeds said vehicle speed limit function.

7. The vehicle acceleration rate management system of claim 5 wherein said control computer includes means for converting said vehicle acceleration limit function to a vehicle speed limit function;

and wherein said control computer is responsive to said vehicle speed limit function and said first vehicle speed signal to control vehicle acceleration by limiting said fueling signal to said predefined fueling function whenever said first vehicle speed signal exceeds said vehicle speed limit function.

8. The vehicle acceleration rate management system of claim 1 wherein said means for determining vehicle acceleration includes means for sensing vehicle acceleration and producing a vehicle acceleration signal corresponding thereto.

9. The vehicle acceleration rate management system of claim 8 wherein said control computer includes:

means for converting said vehicle acceleration limit function to a vehicle speed limit function; and

means for converting said vehicle acceleration signal to a vehicle speed signal;

and wherein said control computer is responsive to said vehicle speed limit function and said vehicle speed signal to control vehicle acceleration by limiting said fueling signal to said predefined fueling function whenever said vehicle speed signal exceeds said vehicle speed limit function.

10. An engine acceleration rate management system comprising:

means for determining an acceleration rate of an internal combustion engine and producing an engine acceleration signal corresponding thereto;

a memory storing an engine acceleration limit function therein;

a fuel system responsive to a fueling signal to provide fuel to the internal combustion engine; and

a control computer producing said fueling signal, said control computer responsive to said engine acceleration signal and said engine acceleration limit function to control engine acceleration by limiting said fueling signal whenever said engine acceleration signal exceeds said engine acceleration limit function.

11. The engine acceleration rate management system of claim 10 further including:

an accelerator responsive to manual actuation thereof to produce an accelerator signal;

and wherein said control computer is operable to generate a torque request signal independently of said accelerator signal, said computer responsive to either of said accelerator signal and said torque request signal to produce said fueling signal, said control computer limiting said fueling signal to said predefined fueling function only when said fueling signal is produced in accordance with said accelerator signal.

12. The engine acceleration rate management system of claim 10 further including:

a transmission connected to said internal combustion engine and having a number of selectable gear ratios engageable with said engine; and

means for determining a currently engaged gear ratio and producing a gear ratio signal corresponding thereto;

wherein said memory unit includes a number of engine acceleration limit functions stored therein, each of said number of engine acceleration limit functions corresponding to one or more of said number of selectable gear ratios;

and wherein said control computer is responsive to said gear ratio signal to limit said fueling signal in accordance with a corresponding one of said number of engine acceleration limit functions.

13. The engine acceleration rate management system of claim 10 further including:

means for sensing engine speed and producing an engine speed signal corresponding thereto;

wherein said engine acceleration limit function includes a number of engine acceleration limit values each corresponding to one of a number of engine speed ranges;

and wherein said control computer is responsive to said engine speed signal to determine a corresponding one of said number of engine speed ranges and select a corresponding one of said number of engine acceleration limit values, said control computer limiting said fueling signal in accordance with said selected one of said number of engine acceleration limit values.

14. The engine acceleration rate management system of claim 10 wherein said means for determining engine acceleration includes:

means for sensing engine speed and producing a first engine speed signal corresponding thereto; and

means within said control computer for converting said engine speed signal to said engine acceleration signal.

15. The engine acceleration rate management system of claim 14 wherein said control computer includes:

means for converting said engine acceleration limit function to a engine speed limit function; and

means for converting said engine acceleration signal to a second engine speed signal;

and wherein said control computer is responsive to said engine speed limit function and said second engine speed signal to control vehicle acceleration by limiting said fueling signal to said predefined fueling function whenever said second engine speed signal exceeds said engine speed limit function.

16. The engine acceleration rate management system of claim 14 wherein said control computer includes means for converting said engine acceleration limit function to an engine speed limit function;

and wherein said control computer is responsive to said engine speed limit function and said first engine speed signal to control engine acceleration by limiting said fueling signal to said predefined fueling function whenever said first engine speed signal exceeds said engine speed limit function.

17. A vehicle/engine acceleration rate management system comprising:

means for sensing speed of a vehicle and producing a valid vehicle speed signal above a threshold vehicle speed and an invalid vehicle speed signal below said threshold vehicle speed;

means responsive to said valid vehicle speed signal for producing a vehicle acceleration signal corresponding to an acceleration rate of the vehicle;

means for producing an engine acceleration signal corresponding to an acceleration rate of an internal combustion engine of the vehicle;

a fuel system responsive to a fueling signal to provide fuel to the internal combustion engine; and

means responsive to said valid vehicle speed signal for controlling vehicle acceleration by accordingly limiting said fueling signal whenever said vehicle acceleration signal exceeds a vehicle acceleration limiting function, and further responsive to said invalid vehicle speed signal for controlling engine acceleration by correspondingly limiting said fueling signal whenever said engine acceleration signal exceeds an engine acceleration function.

18. The vehicle/engine acceleration rate management system of claim 17 further including:

an accelerator responsive to manual actuation thereof to produce an accelerator signal; and

a control computer operable to generate a torque request signal independently of said accelerator signal, and responsive to either of said accelerator signal and said torque request signal to produce said fueling signal, said means for controlling vehicle and engine acceleration limiting said fueling signal only when said fueling signal is produced in accordance with said accelerator signal.

19. The vehicle/engine acceleration rate management system of claim 17 further including:

a transmission connected to said internal combustion engine and having a number of selectable gear ratios engageable with said engine; and

means for determining a currently engaged gear ratio and producing a gear ratio signal corresponding thereto;

wherein said means for controlling vehicle and engine acceleration is responsive to said gear ratio signal to limit said fueling signal according to the currently engaged gear ratio.

20. The vehicle/engine acceleration rate management system of claim 19 wherein said means for producing an engine acceleration signal includes:

means for sensing engine speed and producing an engine speed signal corresponding thereto; and

means for converting said engine speed signal to said engine acceleration signal.

21. The vehicle/engine acceleration rate management system of claim 20 wherein said means for determining a currently engaged gear ratio is responsive to said valid vehicle speed signal and said engine speed signal to determine said currently engaged gear ratio as a ratio thereof, and further responsive to said invalid vehicle speed signal to assign a numerically low one of said number of selectable gear ratios as the currently engaged gear ratio.

22. A vehicle/engine acceleration rate management system comprising:

an accelerator responsive to manual actuation thereof to produce an accelerator signal;

a fuel system responsive to a fueling signal to provide fuel to an internal combustion engine of a vehicle; and

a control computer operable to generate a torque request signal independently of said accelerator signal, said computer responsive to either of said accelerator signal and said torque request signal to produce said fueling signal, said computer including means for limiting said fueling signal to thereby limit acceleration of one of the vehicle and the internal combustion engine only when said fueling signal is produced in accordance with said accelerator signal.