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 Title: |
US5419624:
Arrangement for detecting a critical driving torque in a motor vehicle
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Adler, Uwe; Schweinfurt, Germany
Drexl, Hans-Jurgen; Schonungen, Germany
Lutz, Dieter; Schweinfurt, Germany
Nagler, Franz; Ottendorf, Germany
Ochs, Martin; Schweinfurt, Germany
Schiebold, Stefan; Schweinfurt, Germany
Schmidt-Brucken, Hans-Joachim; Geldersheim, Germany
Thieler, Wolfgang; Hassfurt, Germany
Wagner, Michael; Niederwerrn, Germany
Westendorf, Holger; Hambach, Germany
Wychnanek, Rainer; Madenhausen, Germany
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| Assignee: |
Mannesmann Aktiengesellschaft, Dusseldorf, Germany
other patents from MANNESMANN AG (351245) (approx. 1,242)
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| Published / Filed: |
1995-05-30
/ 1994-04-21
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| Application Number: |
US1994000211961
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| IPC Code: |
Advanced:
B60K 28/16;
B60L 3/10;
B60R 16/02;
B60T 8/172;
B60T 8/175;
B60T 8/1763;
B60T 8/1764;
B60T 8/58;
G01M 17/007;
G01N 19/02;
IPC-7:
B60K 28/16;
B60T 8/32;
G01M 17/06;
G05D 17/00;
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| ECLA Code: |
B60K28/16; B60L3/10B; B60T8/175; G01N19/02; L60T210/12; L60L220/46; L60L240/421; L60L240/423; L60L260/28; L60W550/14G; Y02T10/72D;
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| U.S. Class: |
Current:
303/112;
180/197;
188/181.T;
303/141;
Original:
303/112;
180/197;
188/181.T;
303/100;
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| Field of Search: |
303/112,100,103,104,95,111,102,106-110
188/181 T
364/426.01,426.02,426.03
180/197,65.4
318/139
073/009
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| Priority Number: |
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| Abstract: |
An apparatus for determining a critical driving torque and information representing the coefficient of friction at the wheel grip limit for a vehicle having a plurality of driven wheels. It is suggested that torque control devices be assigned to at least two of the driven wheels so that the ratio of the driving torques of the two driven wheels can be varied, wherein torque sensing device generate a torque signal corresponding to the magnitude of at least the greater of the driving torques of the driven wheels. A wheel slip sensing device is associated with the driven wheels and detects an increase in the slip of the wheel with the greater driving torque beyond a predetermined limit. The information on the coefficient of friction is generated depending on the magnitude of the detected driving torque of the wheel whose slip exceeds the limit. To determine the information concerning the coefficient of friction, the distribution of driving torque between the front axle and rear axle is periodically increased in an alternating manner.
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| Attorney, Agent or Firm: |
Cohen, Pontani, Lieberman, Pavane ;
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| Primary / Asst. Examiners: |
Butler, Douglas C.;
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| Maintenance Status: |
E3 Expired Check current status
CC Certificate of Correction issued
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
CS KR PL RU FR GB IT SE
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| Family: |
Show 20 known family members
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First Claim:
Show all 18 claims |
We claim:
1. An apparatus for determining information representing a critical driving torque at a driving wheel of a motor vehicle having a plurality of driving wheels, comprising: driving torque sensors for determining driving torque information corresponding to the magnitude of the respective driving torque of the respective driving wheel, speed sensors for determining speed information corresponding to the magnitude of the respective speed of the respective driving wheel, a computation circuit for determining and supplying information on the critical driving torque, electric motors for individually driving the driving wheels, and torque control devices for separately controlling the electric motors,
- the computation circuit comprising means for:
- (a) causing, at least at one of the driving wheels, a temporary increase in driving torque, from its current driving torque, a predetermined guantity beyond that of the other driving wheels, wherein the predetermined quantity is selected from the group consisting of a predetermined fixed amount and a predetermined percentage of the current driving torque of this driving wheel,
- (b) determining a speed differential by comparing speed information determined from the driving wheel with increased driving torque by its respective speed sensor with the speed information determined from at least one of the other driving wheels, which have a relatively lower driving torque, by its respective speed sensor for the purpose of detecting slip,
- (c) performing a step, when the computation circuit determines the speed differential does not exceed a given permissible relative speed differential, wherein a wheel grip limit is not exceeded, selected from the group consisting of (i) transmitting a signal with the information that the temporarily increased driving torque is not critical and (ii) causing the driving torque to be increased again by a greater amount,
- (d) transmitting a signal representing the critical driving torque when the given permissible relative speed differential is determined by the computation circuit, and
- (e) determining the critical driving torque, when the computation circuit determines the speed differential exceeds the given permissible relative speed differential, wherein the wheel grip limit is exceeded, and transmitting the critical driving torque as a signal for the purpose of an iterative approximation to the permissible relative speed differential by repeated temporary increases in the driving torque wherein at least the first of the repeated increases is smaller than its respectively preceding temporary increase in the driving torque.
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
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