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 Title: |
US4731727:
Intelligent optimum-gear indication system
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Rauch, Hans; Furth, Germany
Wesemeyer, Jurgen; Nurnberg, Germany
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| Assignee: |
Robert Bosch GmbH, Stuttgart, Germany
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| Published / Filed: |
1988-03-15
/ 1985-05-08
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| Application Number: |
US1985000734264
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| IPC Code: |
Advanced:
B60K 23/00;
B60R 16/02;
B60R 16/023;
B60W 10/04;
B60W 10/10;
F16H 61/00;
F16H 61/02;
F02B 3/06;
F16H 63/42;
IPC-7:
B60K 41/18;
B60Q 9/00;
G09B 19/16;
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| ECLA Code: |
B60R16/023D7; F16H61/02E1M; R02B3/06; R16H61/00F; R16H61/02E1M3; R16H63/42; Y02T10/76;
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| U.S. Class: |
Current:
701/123;
701/064;
Original:
364/442;
364/424.1;
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| Field of Search: |
364/424.1,442
074/866
340/92 D
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| Priority Number: |
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| Abstract: |
PCT No. PCT/DE84/00170 Sec. 371 Date May 8, 1985 Sec. 102(e) Date May 8, 1985 PCT Filed Aug. 30, 1984 PCT Pub. No. WO85/01256 PCT Pub. Date Mar. 28, 1985.A method and a circuit for determining the optimum gear, in terms of fuel consumption, of a motor vehicle drive is proposed, in which after upshifting, a driving power sufficient for accelerating the vehicle is to be made available regardless of such power parameters as total vehicle weight, roadway grades and the like and also regardless of the gear ratios of the gear steps. To this end, during driving, the gear ratios of the gear steps are ascertained by comparing the speeds (n, n1) before and after the transmission (12). Furthermore, these speed values (n, n1) as well as the gas pedal position ( phi ) are continuously stored briefly in memory during the drive, and a standardized power is ascertained based on the change in the driving speed (n1). After a gear shifting operation, the newly ascertained standardized power is compared with the standardized power ascertained prior to shifting, and if the new standardized power is the same or greater, the values for the driving speed (n1) and gas pedal position ( phi ) measured prior to the upshifting are recorded in a threshold value memory (24). An upshifting indication is always effected whenever the instantaneous measured values (n1, phi ) exceed the stored threshold values in the direction of an unfavorable operating range in terms of fuel consumption. The method is applicable to both Diesel and gasoline engines as well as to large and small motors and to any arbitrary, but fixed, gear step ratios.
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| Attorney, Agent or Firm: |
Frishauf, Holtz, Goodman & Woodward ;
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| Primary / Asst. Examiners: |
Gruber, Felix D.;
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| INPADOC Legal Status: |
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Family Legal Status Report
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| Designated Country: |
DE FR SE EP JP US
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| Family: |
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First Claim:
Show all 10 claims |
What is claimed is:
1. Method of intelligently determining and indicating the gear of a motor vehicle drive which optimizes fuel consumption without decreasing the drive power, comprising the steps of:
- (a) measuring the driving speed (n1) of the vehicle (10) and the engine speed (n), and determining, from the ratio of said speeds, which gear (g) is engaged at that time;
- (b) continuously storing in a short-term memory (23) the instantaneous measured values of the driving speed (n1) and the engine speed (n) as well as the gas pedal deflection angle (φ), said engine speed and deflection angle values (n, φ) together defining a working point pair (A1, A2, . . . );
- (c) deriving from the values of the driving speeds (n1) measured in brief succession, a standardized power value (Pn) and temporarily storing said power value;
- (d) after each completed upshifting of the transmission (12), deriving a new standardized power value (Pn2) and comparing said newly derived value with the standardized power value (Pn1) determined prior to the upshifting; and (e) testing whether the new standardized power value (Pn2) is at least equal to said value (Pn1) prior to the upshifting, and, if so, copying from said short-term memory (23) the values, for engine speed (n) and gas pedal deflection angle (φ) which were measured and stored therein prior to said upshifting, into a threshold value memory (24) at a working point location (A) associated with the gear (g) out of which shifting has been performed,
- (f) defining, for the gear (g) out of which shifting has been performed, as an engine operating zone (II) that is unfavorable in terms of fuel consumption, all working point pairs in which the engine speed is greater than said copied engine speed value and the deflection angle value is less than said copied deflection angle value; and
- g) signaling on an upshift indicator (25) the desirability of an upshift each time after said instantaneous values define a working point (A) falling within said unfavorable fuel consumption zone (II).
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| Background / Summary: |
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| Drawing Descriptions: |
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| Description: |
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| PCT Number: |
PCT/DE84/00170
WO8501256
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| PCT Pub./Filed Dates: |
1985-03-28 / 1984-08-30
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| § 371 / 102(e) Dates: |
1985-05-08 / 1985-05-08
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| Forward References: |
Show 18 U.S. patent(s) that reference this one
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