Automatic transmission with power take-off unit

• US 5,522,778 A
• Filed: 03/14/1995
• Issued: 06/04/1996
• Est. Priority Date: 03/18/1994
• Status: Expired due to Term

• Current Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Original Assignee: Aisin Seiki Co., Ltd. (Aisin Corp.)
• Inventors: Kobayashi, Susumu, Iwase, Yoshinobu
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): ESTREMSKY, SHERRY LYNN
• Application Number:
  US08/404,269
• Time in Patent Office: 448 Days
• Field of Search: 477/166, 477/168, 477/169, 477/36, 477/62, 477/64, 477/65, 477/86, 74/733.1, 192/3.3, 192/3.63
• US Class Current: 477/62
• CPC Class Codes: B60K 17/28 characterised by arrangement, location, or type of power take-off
• CPC Class Codes: F16H 59/08 Range selector apparatus
• CPC Class Codes: F16H 59/24 dependent on the throttle opening
• CPC Class Codes: F16H 59/36 Inputs being a function of speed
• CPC Class Codes: F16H 61/143 using electric control means
• CPC Class Codes: Y10T 74/19163 with interrelated controls

Abstract

An automatic transmission system provided with a power take-off unit, which is composed of a torque converter equipped with a lock-up clutch and a control unit that serves to set the lock-up clutch ON/OFF. With the power take-off unit in operation, the control unit sets the lock-up clutch ON only when an engine output is determined to be higher than a predetermined level, and a shift lever is set in either neutral or parking position.

Claims

1. An automatic transmission system with a power take-off unit for taking off auxiliary power comprising:

a torque converter equipped with a lock-up clutch; and

a control unit for setting said lock-up clutch ON and OFF which serves to set said lock-up clutch ON only when an engine output is determined to be higher than a predetermined level, and a transmission shift lever is set in either a neutral or a parking position with said power take-off unit set at ON.

2. An automatic transmission system with a power take-off unit as in claim 1, wherein said control unit serves to determine the engine output based on the value of an engine throttle opening and an engine speed.