Limp home device for a vehicle with automatic transmission

• US 6,948,395 B2
• Filed: 05/14/2003
• Issued: 09/27/2005
• Est. Priority Date: 07/15/2002
• Status: Active Grant

• Current Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Original Assignee: ZF Friedrichshafen AG (Zeppelin - Stiftung der Stadt Friedrichshafen)
• Inventors: Schiele, Peter, Popp, Christian, Steinhauser, Klaus, Gierer, Georg
• Primary Examiner(s): Wright, Dirk
• Application Number:
  US10/437,517
• Publication Number:
  US 20040010361A1
• Time in Patent Office: 867 Days
• Field of Search: 477/906, 701/62, 743/35
• US Class Current: 74/335
• CPC Class Codes: F16H 2059/743 using engine performance or power for control of gearing transmission input torque F16H2059/147
• CPC Class Codes: F16H 2061/1224 Adapting to failures or work around with other constraints, e.g. circumvention by avoiding use of failed parts
• CPC Class Codes: F16H 2061/1232 Bringing the control into a predefined state, e.g. giving priority to particular actuators or gear ratios
• CPC Class Codes: F16H 61/12 Detecting malfunction or potential malfunction, e.g. fail safe in control of hydrostatic gearing F16H61/4192; Circumventing or fixing failures
• CPC Class Codes: Y10S 477/906 Means detecting or ameliorating the effects of malfunction or potential malfunction
• CPC Class Codes: Y10T 74/19251 Control mechanism

Abstract

A device to allow for emergency operation of an automatic-transmission motor vehicle, having a monitoring device to monitor pre-determined operating parameters, a diagnostic device to detect faults, a control device to activate an alternative function, and an output device by means of which the fault may be presented to the driver. The control device provides the driver an emergency operation capability while providing an alternative function depending on the degree of the fault.

Claims

1. A device allowing emergency operation of a motor vehicle, having an automatic transmission, comprising a monitoring device to monitor pre-determined operating parameters, a diagnostic device to detect a fault, a control device to activate an alternative function, and an output device for presenting an indication of a fault to a driver, wherein the control device allows an emergency operating period by means of the alternative function depending on a degree of the fault, such emergency operating period being presented to the driver.

2. A device as in claim 1, wherein a degree of fault is determined by a violation of legal environmental-protection regulations, comprising non-compliance with prescribed exhaust gas emissions values, fuel-consumption values, or noise emissions.

3. A device as in claim 1, wherein the output device presents the emergency-operation capability to the driver via at least one of optical, acoustic, and tactile signals.

4. A device as in claim 1, wherein the control device allows emergency operation by means of a limitation on selection of available gears.

5. A device as in claim 1, wherein the control device allows limited emergency operation selected from the group consisting of a limited time, a limited distance, and a limited number of startup procedures, after the fault is recognized.

6. A device as in claim 1, wherein the alternative function comprises a reduced capability for emergency operation, which is reported to the driver by means of a gradual reduction in one or more of a selection of available gears, a remaining time, a distance, an available performance, and a non-performance of driving functions.

7. A method for allowing emergency operation of a motor vehicle having an automatic transmission, comprising a monitoring pre-determined operating parameters, detecting a fault, activating an alternative function, presenting an indication of a fault to a driver, and providing a limited emergency operating period by means of the alternative function depending on a degree of the fault, such emergency operating period being presented to the driver.

8. A method as in claim 7, further comprising the step of wherein determined a degree of fault based on a violation of legal environmental-protection regulations, comprising at least one of non-compliance with prescribed exhaust gas emissions values, fuel-consumption values, or noise emissions.

9. A method as in claim 7, further comprising the step of presenting the emergency-operation capability to the driver via at least one of optical, acoustic, and tactile signals.

10. A method as in claim 7, further comprising the step of limiting selection of available gears during emergency operation.

11. A method as in claim 7, further comprising the step of limiting emergency operation by limiting at least one of an operating time, an operating distance, and a number of startup procedures, after the fault is recognized.

12. A method as in claim 7, wherein the alternative function comprises a reduced capability for emergency operation, which is reported to the driver by means of a gradual reduction in one or more of a selection of available gears, a remaining time, a distance, an available performance, and a non-performance of driving functions.

13. An automobile, having a normal operating mode and an alternative function, comprising a control which monitors pre-determined operating parameters, detects a fault, and activates the alternative function in dependence thereon, and wherein a driver is presented with an indication of, and level of restriction associated with, the alternative function through an output device, said control providing a limited emergency operating period by means of the alternative function depending on a degree of the fault.

14. An automobile as in claim 13, wherein the degree of fault is determined based on a violation of legal environmental-protection regulations, comprising at least one of non-compliance with prescribed exhaust gas emissions values, fuel-consumption values, or noise omissions.

15. An automobile as in claim 13, wherein the output device presents the emergency-operation capability to the driver via at least one of optical, acoustic, and tactile signals.

16. An automobile as in claim 13, wherein the control limits selection of available gears during emergency operation.

17. An automobile as in claim 13, wherein the control, during emergency operation, limits at least one of an operating time, an operating distance, and a number of startup procedures, after the fault is recognized.

18. An automobile as in claim 13, wherein the alternative function comprises a reduced capability for emergency operation, which is reported to the driver by means of a gradual reduction in one or more of a selection of available gears, a remaining time, a distance, an available performance, and a non-performance of driving functions.