米国特許クレーム研究--United States Patent 7,363,138(5/1)

United States Patent 7,363,138
"Wheel slip detection and torque management"

【分析】
(1)　自動車の制御に関する技術。方法クレームとして発明をカバーしている。
(2)　"detect"、"compare"、"reduce"の流れで時系列に処理を規定している。発明のresultまでクレームで規定している（発明の有用性を主張できるようにしている）。
(3) 権利範囲を広くするため、"at least one of"の用語を効果的に使っている。
(4) 装置クレームに関しても、起草可能か考察すること。
(5) "least-square approach":最小二乗法

1. A method of controlling traction in a vehicle having at least one non-driven wheel speed sensor,

the method comprising:

detecting at least one of actual vehicle acceleration and a wheel speed difference;

comparing said at least one of said actual vehicle acceleration and said wheel speed difference to at least one of a predetermined vehicle acceleration and a predetermined wheel speed difference to detect vehicle wheel slip; and

reducing wheel torque in response to said detected wheel slip based upon vehicle acceleration using a least squares approach or a wheel speed difference;

said method further comprising:

comparing a non-driven wheel speed to a threshold non-driven wheel speed value and trans throttle value to a threshold throttle value to obtain a comparison result; and

selecting a wheel slip detection method based on said comparison result.


2. The method of claim 1 wherein said comparing step further includes:

detecting a wheel speed acceleration; and comparing said wheel speed acceleration to a predetermined wheel speed acceleration to detect wheel slip.


3. The method of claim 1 further comprising:

specifying a transmission speed ratio based on a current vehicle speed; and

providing a line pressure in the transmission based on the specified speed ratio.

[TY(弁理士)]