Gear shifting completion determining device and gear shifting completion determining method

• US 20070066441A1
• Filed: 09/18/2006
• Published: 03/22/2007
• Est. Priority Date: 09/22/2005
• Status: Active Grant

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Otsubo, Masaaki
• Granted Patent: US 7,540,211 B2
• Time in Patent Office: Days
• US Class Current: 477/97
• CPC Class Codes: F16H 2059/6807 Status of gear-change operation, e.g. clutch fully engaged
• CPC Class Codes: F16H 59/68 Inputs being a function of gearing status
• CPC Class Codes: Y10T 74/1926 Speed responsive

Abstract

The ECU executes a program including the step of setting a threshold value A to be compared with a stroke amount of an actuator for determining whether gear shifting has completed or not, taking no account of a deflection amount C of the hardware due to the shift load, when the vehicle speed V is higher than a predetermined vehicle speed V(0), and the step of setting a threshold value B to be compared with the stroke amount of the actuator for determining whether gear shifting has completed or not, to a value obtained by adding the deflection amount C of the hardware due to the shift load to the threshold value A used when the vehicle speed V is not lower than V(0), when the vehicle speed V is lower than the predetermined vehicle speed V(0).

Claims

1. A gear shifting completion determining device in a transmission in which gear shifting is carried out as a first part and a second part are meshed with each other by an actuator, comprising:

a determining unit determining that gear shifting of said transmission has completed when a stroke amount of said actuator has reached a predetermined threshold value;

a detecting unit detecting an operating state of a vehicle to which said transmission is mounted; and

a setting unit setting said threshold value based on said operating state of said vehicle.

2. The gear shifting completion determining device according to claim 1, wherein

said detecting unit detects a vehicle speed of said vehicle, and

said setting unit sets said threshold value to a value in a direction where said parts would mesh with each other more firmly when the vehicle speed is lower than when the vehicle speed is higher.

3. The gear shifting completion determining device according to claim 1, wherein said setting unit is a first setting unit,

said gear shifting completion determining device further comprising:

a load detecting unit detecting a load applied to said transmission by said actuator; and

a second setting unit setting said threshold value to a value in a direction where said parts would mesh with each other more firmly when the load is greater than when the load is smaller.

4. A gear shifting completion determining device in a transmission in which gear shifting is carried out as a first part and a second part are meshed with each other by an actuator, comprising:

determining means for determining that gear shifting of said transmission has completed when a stroke amount of said actuator has reached a predetermined threshold value;

detecting means for detecting an operating state of a vehicle to which said transmission is mounted; and

setting means for setting said threshold value based on said operating state of said vehicle.

5. The gear shifting completion determining device according to claim 4, wherein

said detecting means includes means for detecting a vehicle speed of said vehicle, and

said setting means includes means for setting said threshold value to a value in a direction where said parts would mesh with each other more firmly when the vehicle speed is lower than when the vehicle speed is higher.

6. The gear shifting completion determining device according to claim 4, further comprising:

means for detecting a load applied to said transmission by said actuator; and

means for setting said threshold value to a value in a direction where said parts would mesh with each other more firmly when the load is greater than when the load is smaller.

7. A gear shifting completion determining method in a transmission in which gear shifting is carried out as a first part and a second part are meshed with each other by an actuator, comprising the steps of:

determining that gear shifting of said transmission has completed when a stroke amount of said actuator has reached a predetermined threshold value;

detecting an operating state of a vehicle to which said transmission is mounted; and

setting said threshold value based on said operating state of said vehicle.

8. The gear shifting completion determining method according to claim 7, wherein

said step of detecting an operating state of a vehicle includes the step of detecting a vehicle speed of said vehicle, and

said step of setting said threshold value includes the step of setting said threshold value to a value in a direction where said parts would mesh with each other more firmly when the vehicle speed is lower than when the vehicle speed is higher.

9. The gear shifting completion determining method according to claim 7, further comprising the steps of:

detecting a load applied to said transmission by said actuator; and

setting said threshold value to a value in a direction where said parts would mesh with each other more firmly when the load is greater than when the load is smaller.