Vehicle controller

Patent metadata

Field	Value
Publication number	US-10144412-B2
Application number	US-201414915323-A
Country	US
Kind code	B2
Filing date	Aug 27, 2014
Priority date	Sep 13, 2013
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

An initial variation learning control is executed when a learning condition is satisfied each time the learning condition is satisfied, with the aim of absorbing initial variations of manufacturing errors or variations of components of a second clutch (CL2). When the number of times of learning control is counted and this becomes a predetermined number (e.g. five times), after that, a deterioration variation learning control, which is equivalent to the initial variation learning control, is executed only once a trip from ON of a key switch to OFF of the key switch. With this, a frequency of execution of the learning control can be reduced, and the number of times of the learning can be reduced. It is therefore possible to suppress energy consumption and improve energy efficiency in stand-by pressure learning control of the second clutch that serves as a starter clutch.

First claim

The invention claimed is:

1. A vehicle controller comprising:
a rotation driving source structured to generate a driving force of a vehicle;
a clutch interposed between the rotation driving source and a driving wheel and structured to generate a transmission torque capacity according to a hydraulic pressure command value;
a revolution speed control unit configured to perform a slip control of the clutch and also perform a revolution speed control of the rotation driving source so that a revolution speed at a rotation driving source side of the clutch is higher than a revolution speed at a driving wheel side of the clutch by a predetermined speed;
a torque detection unit configured to detect an actual torque of the rotation driving source;
a vehicle stop state judgment unit configured to judge a stop state of the vehicle; and
a vehicle-stop-time transmission torque capacity correction unit configured to
when the vehicle stop state is judged, execute a learning control that learns the hydraulic pressure command value of the clutch that begins to have a transmission torque capacity, and set the hydraulic pressure command value, and
set, as an initial hydraulic pressure command value, a hydraulic pressure obtained by adding a predetermined amount to an Nth learning value of a hydraulic pressure command value,
set, as an end command value, a hydraulic pressure command value that is a value immediately before the actual torque of the rotation driving source that does not follow a change of a hydraulic pressure command value that is decreased stepwise from the initial hydraulic pressure command value,
set, as an (N+1)th learning value of a hydraulic pressure command value, the end command value or a hydraulic pressure command value obtained by adding a predetermined correction amount to the end command value, and
after the learning of the hydraulic pressure command value is converged, reduce a frequency of execution of the learning control more than that before the learning is converged,

wherein a convergence judgment of the learning of the hydraulic pressure command value is made so that when the number of times of execution of the learning control becomes a predetermined number, the learning is converged.

Assignees

• Jatco Ltd

Inventors

• Kotsuji Kouichi
• Sekiguchi Shoichi

Classifications

• B60L2250/26

  by pedal actuation · CPC title

• B60L15/2009

  for braking · CPC title

• F16D2500/3024

  Pressure · CPC title

• B60W10/02

  including control of driveline clutches · CPC title

• B60L2240/12

  Speed · CPC title