SHIFT CONTROL DEVICE FOR AUTOMATIC TRANSMISSION

• US 20150184742A1
• Filed: 04/12/2013
• Published: 07/02/2015
• Est. Priority Date: 06/07/2012
• Status: Active Grant

• Current Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Original Assignee: Honda Motor Co., Ltd. (Honda Motor Company)
• Inventors: Inagawa, Yasushi, Saito, Yoshiharu, Karger, Christoph
• Granted Patent: US 9,458,930 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: F16H 2059/142 of driving resistance calculated from weight, slope, or the like
• CPC Class Codes: F16H 2059/148 Transmission output torque, e.g. measured or estimated torque at output drive shaft
• CPC Class Codes: F16H 2059/663 Road slope
• CPC Class Codes: F16H 2061/0096 using a parameter map
• CPC Class Codes: F16H 59/24 dependent on the throttle opening
• CPC Class Codes: F16H 61/0213 characterised by the method for generating shift signals
• CPC Class Codes: F16H 61/10 Controlling shift hysteresis

Abstract

Adding a driver'"'"'s intention and running environments to conditions for cancelling a delay of an upshift after kickdown enables the upshift at a suitable timing depending on a vehicle'"'"'s running environments and aspects of the driver'"'"'s operation. A shift control device for automatic transmission calculates an allowance driving force of the vehicle when upshifting at a current vehicle speed and throttle opening, and also calculates a threshold value of a driving force depending on an average value of throttle opening variation, an average value of vehicle speed variation, a cornering judgment of a winding degree of a road on which the vehicle is running and a gradient judgment of a gradient of a road surface on which the vehicle is running. Then, after comparing the threshold value and the allowance driving force, the device permits an upshift when the allowance driving force is larger than the threshold value.

Claims

1. A shift control device for automatic transmission for upshift and downshift controls of gear positions according to a shift map including an upshift line and a downshift line set per gear position, shift control device comprising:

a speed control means configured to output upshift and downshift transmission signals according to a first upshift line and a downshift line based on first transmission properties set depending on a vehicle speed and a throttle opening;

a downshift judgment means configured to judge, on the basis of the first transmission properties, the downshift transmission signals having been output;

a transmission property change means configured to change the first transmission properties to second transmission properties including a second upshift line being the first upshift line shifted to a high vehicle speed side;

an operational state detection means configured to detect an operational state of a vehicle; and

an upshift permission means configured to permit an upshift according to fulfillment of predetermined conditions when a vehicle speed and a throttle opening is in a range between the first upshift line and the second upshift line,

wherein the upshift permission means calculates an allowance driving force of the vehicle when upshifting at a current vehicle speed and throttle opening, then calculates a threshold value of driving force including a throttle opening variation, a vehicle speed variation, a cornering judgment of judging a winding degree of a road with a vehicle kept running thereon, and a gradient judgment of judging a gradient of a road surface with the vehicle kept running thereon, then compares the threshold value with the allowance driving force, and accordingly permits an upshift when the allowance driving force is larger than the threshold value.

2. The shift control device for automatic transmission according to claim 1, wherein the threshold value of driving force is set higher as the winding degree in the cornering judgment is higher and set higher as the gradient of the road surface in the gradient judgment is higher.

3. A shift control device for automatic transmission performing upshift and downshift controls of gear positions according to a shift map including an upshift line and a downshift line set per gear position, the shift control device comprising:

a speed control means configured to output transmission signals of upshift and downshift according to the first upshift line and the downshift line based on first transmission properties set depending on a vehicle speed and a throttle opening;

a downshift judgment means configured to judge, based on the first transmission properties, the downshift transmission signals having been output;

a transmission property change means configured to change, when the downshift judgment means judges downshift, the first transmission properties to second transmission properties including a second upshift line being the first upshift line shifted to a high vehicle speed side;

a operational state detection means configured to detect an operational state of a vehicle; and

a delay means configured to delay, in a range where an upshift transmission signal is output based on the second transmission properties, to output the upshift transmission signal during a predetermined delay time based on a vehicle'"'"'s operational state detected by the operational state detection means,

wherein the delay means calculates a first time based on a vehicle speed variation, a throttle opening variation and a vehicle speed and a second time based on at least either one of a cornering judgment of a degree of a winding road with the vehicle kept running and a gradient judgment of a gradient of a road with the vehicle kept running, and then setting a combined time of the first time and the second time as a delay time for delaying an upshift.

4. The shift control device for automatic transmission according to claim 3, wherein the first time is shorter as the vehicle speed variation is smaller, shorter as the throttle opening variation is smaller and shorter as the vehicle speed is higher, and wherein the second time is longer as the winding degree of the road in the cornering judgment is higher and longer as the gradient of the road surface in the gradient judgment is higher.