Methods and systems for controlling shifting between operating modes in hybrid vehicles

• US 9,174,626 B2
• Filed: 01/25/2008
• Issued: 11/03/2015
• Est. Priority Date: 01/25/2008
• Status: Expired due to Fees

• Current Assignee: GM Global Technology Operations LLC (General Motors Company)
• Original Assignee: GM Global Technology Operations LLC (General Motors Company)
• Inventors: Tiwari, Awadesh, Kesavan, Deepa
• Primary Examiner(s): Restifo, Jeffrey J
• Assistant Examiner(s): Gurari, Erez
• Application Number:
  US12/020,295
• Publication Number:
  US 20090192014A1
• Time in Patent Office: 2,839 Days
• Field of Search: 477 3- 7
• US Class Current: 1/1
• CPC Class Codes: B60K 6/365 with the gears having orbital motion
• CPC Class Codes: B60K 6/445 Differential gearing distribution type
• CPC Class Codes: B60W 10/08 including control of electric propulsion units, e.g. motors or generators
• CPC Class Codes: B60W 10/115 with planetary gears
• CPC Class Codes: B60W 20/00 Control systems specially adapted for hybrid vehicles hybrid vehicle design, B60K6/00; electric vehicles B60L
• CPC Class Codes: B60W 20/13 in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
• CPC Class Codes: B60W 2510/0604 Throttle position
• CPC Class Codes: B60W 2510/244 Charge state
• CPC Class Codes: B60W 2540/10 Accelerator pedal position
• CPC Class Codes: Y02T 10/62 Hybrid vehicles

Abstract

A method for controlling shifting between a plurality of operating modes in a hybrid vehicle includes the steps of obtaining a plurality of throttle position values, generating a comparison between a first throttle position value of the plurality of throttle position values and a second throttle position value of the plurality of throttle position values, and selectively allowing a shift between at least two of the plurality of operating modes, based at least in part on the comparison between the first and second throttle position values.

Claims

1. A method for controlling shifting between a plurality of operating modes in a hybrid vehicle having a regenerative braking feature, the method comprising the steps of:

obtaining a plurality of throttle position calculating a difference between a first throttle position value of the plurality of throttle position values and a second throttle position value of the plurality of throttle position values, wherein the first throttle position value represents a current throttle position value occurring at a current point in time, and the second throttle position value represents a previous throttle position value occurring at a prior point in time before the current point; and

selectively allowing a shift between a first operating mode of the plurality of operating modes, in which the regenerative braking feature is in use, and a second operating mode of the plurality of operating modes, in which the regenerative braking feature is not in use, based at least in part on the difference between the first and second throttle position values;

wherein the step of selectively allowing a shift comprises the step of;

selectively allowing a shift between the first and second operating modes, based at least in part on whether an absolute value of the difference between the current and the previous throttle position values is greater than a first predetermined value, and based at least in part on whether the absolute value of the difference between the current and the previous throttle position values is less than a second predetermined value.

2. A method for controlling shifting between a plurality of operating modes in a hybrid vehicle having a regenerative braking feature, the method comprising the steps of:

obtaining a plurality of throttle position values;

calculating a difference between a first throttle position value of the plurality of throttle position values and a second throttle position value of the plurality of throttle position values, wherein the first throttle position value represents a current throttle position value occurring at a current point in time, and the second throttle position value represents a previous throttle position value occurring at a prior point in time before the current point; and

selectively allowing a shift between a first operating mode of the plurality of operating modes, in which the regenerative braking feature is in use, and a second operating mode of the plurality of operating modes, in which the regenerative braking feature is not in use, based at least in part on the difference between the first and second throttle position values,

wherein the plurality of throttle position values further comprises a plurality of additional prior throttle position values occurring at additional respective points in time before the prior point, and the method further comprises the steps of;

subtracting each of the plurality of additional prior throttle position values from an immediately subsequent throttle position value, to thereby generate a plurality of additional differences; and

selectively allowing the shift between the first and second operating modes, only if the difference between the current and the previous throttle position values and each of the plurality of additional differences are all greater than a predetermined threshold value.

3. A method for controlling shifting between a plurality of operating modes in a hybrid vehicle having a regenerative braking feature, the method comprising the steps of:

obtaining a plurality of throttle position calculating a difference between a first throttle position value of the plurality of throttle position values and a second throttle position value of the plurality of throttle position values, wherein the first throttle position value represents a current throttle position value occurring at a current point in time, and the second throttle position value represents a previous throttle position value occurring at a prior point in time before the current point; and

selectively allowing a shift between a first operating mode of the plurality of operating modes, in which the regenerative braking feature is in use, and a second operating mode of the plurality of operating modes, in which the regenerative braking feature is not in use, based at least in part on the difference between the first and second throttle position values;

wherein the step of selectively allowing a shift between the first operating mode and the second operating mode further comprises the step of;

selectively allowing a shift between the first operating mode and the second operating mode based on an acceleration parameter comprising an acceleration count as to a number of consecutive, multiple time intervals for which the throttle position for the hybrid vehicle has increased or remained substantially constant.

4. The method of claim 3, further comprising the steps of:

incrementing the acceleration count when the throttle position has increased for a current time interval;

incrementing the acceleration count if the acceleration count is already greater than zero and the throttle position has not decreased by at least a predetermined amount for the current time interval; and

re-setting the acceleration count if the throttle position has decreased by at least the predetermined amount for the current time interval.

5. The method of claim 3, wherein the step of selectively allowing a shift between the first operating mode and the second operating mode further comprises the step of:

selectively allowing a shift between the first operating mode and the second operating mode based on a deceleration parameter comprising a deceleration count as to a number of consecutive, multiple time intervals for which the throttle position for the hybrid vehicle has decreased or remained substantially constant.

6. The method of claim 5, further comprising the steps of:

incrementing the acceleration count when the throttle position has increased by at least a predetermined amount for a current time interval;

incrementing the deceleration count when the throttle position has decreased by at least the predetermined amount for the current time interval;

incrementing the acceleration count if the acceleration count is already greater than zero and the throttle position has not decreased by at least the predetermined amount for the current time interval;

incrementing the deceleration count if the deceleration count is already greater than zero and the throttle position has not increased by at least the predetermined amount for the current time interval;

re-setting the acceleration count if the throttle position has decreased by at least the predetermined amount for the current time interval, if the acceleration count was greater than zero; and

re-setting the deceleration count if the throttle position has increased by at least the predetermined amount for the current time interval, if the deceleration count was greater than zero.

7. A program product for controlling shifting between a plurality of operating modes in a hybrid vehicle having a regenerative braking feature, the program product comprising:

a program configured to at least facilitate;

obtaining a plurality of throttle position values;

calculating a difference between a first throttle position value of the plurality of throttle position values and a second throttle position value of the plurality of throttle position values, wherein the first throttle position value represents a current throttle position value occurring at a current point in time, and the second throttle position value represents a previous throttle position value occurring at a prior point in time before the current point;

selectively allowing a shift between a first operating mode of the plurality of operating modes, in which the regenerative braking feature is in use, and a second operating mode of the plurality of operating modes, in which the regenerative braking feature is not in use, based at least in part on the difference between the first and second throttle position values; and

a computer-readable signal-bearing media bearing the program;

wherein the shift between the first and second operating modes is selectively allowed based at least in part on whether an absolute value of the difference between the current and the previous throttle position values is greater than a first predetermined value, and based at least in part on whether the absolute value of the difference between the current and the previous throttle position values is less than a second predetermined value.

8. The program product of claim 7, wherein:

the plurality of throttle position values further comprises a plurality of additional prior throttle position values occurring at additional respective points in time before the prior point; and

the program is further configured to at least facilitate subtracting each of the plurality of additional prior throttle position values from an immediately subsequent throttle position value, to thereby generate a plurality of additional differences; and

the shift between the first and second operating modes is selectively allowed based also at least in part on whether the difference between the current and the previous throttle position values and each of the plurality of additional differences are all greater than a predetermined threshold value.

9. A program product for controlling shifting between a plurality of operating modes in a hybrid vehicle having a regenerative braking feature, the program product comprising:

a program configured to at least facilitate;

obtaining a plurality of throttle position values;

calculating a difference between a first throttle position value of the plurality of throttle position values and a second throttle position value of the plurality of throttle position values, wherein the first throttle position value represents a current throttle position value occurring at a current point in time, and the second throttle position value represents a previous throttle position value occurring at a prior point in time before the current point;

selectively allowing a shift between a first operating mode of the plurality of operating modes, in which the regenerative braking feature is in use, and a second operating mode of the plurality of operating modes, in which the regenerative braking feature is not in use, based at least in part on the difference between the first and second throttle position values; and

a computer-readable signal-bearing media bearing the program;

wherein the program is further configured to at least facilitate selectively allowing a shift between the first operating mode and the second operating mode based on an acceleration parameter comprising an acceleration count as to a number of consecutive, multiple time intervals for which the throttle position for the hybrid vehicle has increased or remained substantially constant.

10. The program product of claim 9, wherein the program is further configured to at least facilitate:

incrementing the acceleration count when the throttle position has increased for a current time interval;

incrementing the acceleration count if the acceleration count is already greater than zero and the throttle position has not decreased by at least a predetermined amount for the current time interval; and

re-setting the acceleration count if the throttle position has decreased by at least the predetermined amount for the current time interval.

11. The program product of claim 9, wherein the program is further configured to at least facilitate selectively allowing a shift between the first operating mode and the second operating mode based on a deceleration parameter comprising a deceleration count as to a number of consecutive, multiple time intervals for which the throttle position for the hybrid vehicle has decreased or remained substantially constant.

12. A system for controlling shifting between a plurality of operating modes in a hybrid vehicle having a regenerative braking feature, the system comprising:

a sensor configured to obtain a plurality of throttle position values;

a first control module coupled to the sensor, the first control module configured to;

receive the plurality of throttle position values;

calculate a difference between a first throttle position value of the plurality of throttle position values and a second throttle position value of the plurality of throttle position values, wherein the first throttle position value represents a current throttle position value occurring at a current point in time, and the second throttle position value represents a previous throttle position value occurring at a prior point in time before the current point; and

generate an instruction for selectively allowing a shift between a first operating mode of the plurality of operating modes, in which the regenerative braking feature is in use, and a second operating mode of the plurality of operating modes, in which the regenerative braking feature is not in use, based at least in part on the comparison between the first and second throttle position values; and

a second control module coupled to the first control module and configured to;

receive the instruction from the first control module; and

selectively allow the shift between the first and second operating modes based at least in part on the instruction;

wherein the first control module is further configured to generate an instruction for selectively allowing a shift between the first operating mode and the second operating mode based on an acceleration parameter comprising an acceleration count as to a number of consecutive, multiple time intervals for which the throttle position for the hybrid vehicle has increased or remained substantially constant.

13. The system of claim 12, wherein the first control module is further configured to generate instructions for:

incrementing the acceleration count when the throttle position has increased for a current time interval;

incrementing the acceleration count if the acceleration count is already greater than zero and the throttle position has not decreased by at least a predetermined amount for the current time interval; and

re-setting the acceleration count if the throttle position has decreased by at least the predetermined amount for the current time interval.

14. The system of claim 12, wherein the first control module is further configured to generate an instruction for selectively allowing a shift between the first operating mode and the second operating mode based on a deceleration parameter comprising a deceleration count as to a number of consecutive, multiple time intervals for which the throttle position for the hybrid vehicle has decreased or remained substantially constant.

15. The system of claim 14, wherein the first control module is further configured to generate an instruction for:

incrementing the acceleration count when the throttle position has increased by at least a predetermined amount for a current time interval;

incrementing the deceleration count when the throttle position has decreased by at least the predetermined amount for the current time interval;

incrementing the acceleration count if the acceleration count is already greater than zero and the throttle position has not decreased by at least the predetermined amount for the current time interval;

incrementing the deceleration count if the deceleration count is already greater than zero and the throttle position has not increased by at least the predetermined amount for the current time interval;

re-setting the acceleration count if the throttle position has decreased by at least the predetermined amount for the current time interval, if the acceleration count was greater than zero; and

re-setting the deceleration count if the throttle position has increased by at least the predetermined amount for the current time interval, if the deceleration count was greater than zero.

16. A system for controlling shifting between a plurality of operating modes in a hybrid vehicle having a regenerative braking feature, the system comprising:

a sensor configured to obtain a plurality of throttle position values;

a first control module coupled to the sensor, the first control module configured to;

receive the plurality of throttle position values;

calculate a difference between a first throttle position value of the plurality of throttle position values and a second throttle position value of the plurality of throttle position values, wherein the first throttle position value represents a current throttle position value occurring at a current point in time, and the second throttle position value represents a previous throttle position value occurring at a prior point in time before the current point; and

generate an instruction for selectively allowing a shift between a first operating mode of the plurality of operating modes, in which the regenerative braking feature is in use, and a second operating mode of the plurality of operating modes, in which the regenerative braking feature is not in use, based at least in part on the comparison between the first and second throttle position values; and

a second control module coupled to the first control module and configured to;

receive the instruction from the first control module; and

selectively allow the shift between the first and second operating modes based at least in part on the instruction;

wherein the shift between the first and second operating modes is selectively allowed based at least in part on whether;

the difference between the current and the previous throttle position values is greater than a first predetermined value; and

the difference between the current and the previous throttle position values is greater than a second predetermined value;

the plurality of throttle position values further comprises a plurality of additional prior throttle position values occurring at additional respective points in time before the prior point;

the second control module is further configured to at least facilitate subtracting each of the plurality of additional prior throttle position values from an immediately subsequent throttle position value, to thereby generate a plurality of additional differences; and

the shift between first and second operating modes is selectively allowed based also at least in part on whether the difference between the current and the previous throttle position values and each of the plurality of additional differences all are greater than a predetermined threshold value.