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Title: US6104976: Vehicle speed control system
[ Derwent Title ]


Country: US United States of America

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20 pages

 
Inventor: Nakamura, Hideo; Tokyo, Japan

Assignee: Nissan Motor Co., Ltd., Kanagawa, Japan
other patents from NISSAN MOTOR COMPANY, LIMITED (404330) (approx. 7,718)
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Published / Filed: 2000-08-15 / 1998-08-31

Application Number: US1998000144083

IPC Code: Advanced: B60K 31/00; B60K 31/04; B60W 10/04; B60W 10/10; B60W 10/101; B60W 30/00; B60W 30/14; B60W 50/06; F02D 29/02; F02D 41/14; F16H 61/02; F16H 63/50; F16H 61/66;
IPC-7: B60T 31/00;

ECLA Code: B60K31/04B2B;

U.S. Class: Current: 701/095; 180/170; 180/179; 477/107; 477/110; 477/115; 477/118; 701/054; 701/084; 701/085; 701/086; 701/087;
Original: 701/095; 701/084; 701/085; 701/086; 701/087; 701/054; 180/170; 180/179; 477/107; 477/110; 477/115; 477/118;

Field of Search: 701/095,83-87,90,93,54 180/170,179 477/107,115,118,110

Priority Number:
1997-09-01  JP1997000235958

Abstract:     A vehicle speed control system comprises a section for calculating a command driving force-required to make a sensed vehicle speed equal to a preset command vehicle speed, a section for calculating a command engine output in accordance with the command driving force and the command vehicle speed, a section for calculating a command engine speed corresponding to the command engine output from a predetermined engine torque-versus-speed characteristic relationship in an engine constraint state of minimum throttle setting and fuel cutoff inhibition when the command driving. force is negative, and a section for calculating a command transmission ratio in accordance with the command engine speed. When the driving force command is negative, the control system put the engine in the constraint state and controls a continuously variable transmission in response to the command transmission ratio so as to prevent undesired vehicle speed hunting.

Attorney, Agent or Firm: McDermott, Will & Emery ;

Primary / Asst. Examiners: Cuchlinski, Jr., William A.; Beaulieu, Yonel

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Family: Show 3 known family members

First Claim:
Show all 19 claims
What is claimed is:     1. A vehicle speed control system comprising:
  • a speed setting section for setting a command vehicle speed;
  • a vehicle speed sensing section for sensing an actual vehicle speed;
  • a driving force calculating section for calculating a command driving force required to make the actual vehicle speed equal to the command vehicle speed;
  • an engine output calculating section for calculating a command engine output in accordance with the command driving force and the command vehicle speed;
  • a discriminating section for examining the command driving force to determine whether the command driving force is negative;
  • a command engine speed calculating section for storing a predetermined engine torque-versus-engine-speed characteristic relationship in an engine constraint state in which a throttle is fully closed and fuel cutoff is inhibited and for calculating a command engine speed corresponding to the command engine output, from the predetermined engine torque-versus-engine-speed characteristic relationship in the engine constraint state when the command driving force is negative;
  • a transmission ratio calculating section for calculating a command transmission ratio in accordance with the command engine speed;
  • an engine controlling section for putting an engine in the engine constraint state when the command driving force is negative; and
  • a transmission controlling section for controlling a continuously variable transmission in response to the command transmission ratio when the command driving force is negative.


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Forward References: Show 31 U.S. patent(s) that reference this one

       
U.S. References: Go to Result Set: All U.S. references   |  Forward references (31)   |   Backward references (4)   |   Citation Link

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PDF
Patent  Pub.Date  Inventor Assignee   Title
Get PDF - 22pp US4939656  1990-07 Hoashi et al.  Nippondenso Co., Ltd. Control system for excessive slip prevention on starting and acceleration of motor vehicle
Get PDF - 9pp US5033571  1991-07 Morimoto  Fuji Jukogyo Kabushiki Kaisha Drive speed control system for a motor vehicle having a continuously variable transmission
Get PDF - 9pp US5197564  1993-03 Nishimura et al.  Mitsubishi Denki Kabushiki Kaisha Cruise control apparatus for a vehicle
Get PDF - 27pp US5758306  1998-05 Nakamura  Nissan Motor Co., Ltd. Vehicle cruise control system
       
Foreign References:
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Publication Date IPC Code Assignee   Title
  JP61232927 1986-10       


Other Abstract Info: DERABS G1999-260179

Other References:
  • "Control Algorithms for DBW", S. Morita, Jidoshagijutsu gakkai-shi, vol. 48, No. 10, 1994, pp. 13-19.


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