EP0256786A2
Expired / Lapsed
EP
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Vehicle control system and method therefor
Assignee: Honda Motor Co Ltd
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Filing: 1987-08-06
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Granted: —
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Expires: 2007-08-06
Abstract
Abstract A system for electronically controlling vehicle operation vehicle and a method therefor applied to a cruise control, which utilizes fuzzy logic or approximate reasoning in determining a control output. Namely, vehicle operating conditions are assigned on a scale called a universe of discourse having degrees of 0 to 1.0 called membership functions or degrees. The detected conditions are identified on the universe and are then defined by fuzzy labels which are in turn used for retrieving control rules expressed in similar labels. Pertinent control rules are composed in fuzzy relation so as to obtain a scaled or universe value which is then converted into a real numerical value. The value is finally sent to a pulse motor control device which opens or closes a throttle valve in order to maintain the vehicle at a predetermined cruising speed.
Inventors
- 👤 Takefumi Hosaka
- 👤 Yasuhisa Arai
- 👤 Hiroki Matsui
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-24 14:14
CPC Classifications
B; B60; B60K; B60K31/00; B60K31/02; B60K31/04; B60K31/042; B60K31/045; B60K31/047; Y; Y10; Y10S; Y10S706/00; Y10S706/90; Y10S706/902; Y10S706/903; Y10S706/905
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
89 words
A method for controlling vehicle operation, which comprises: assigning operating conditions of the vehicle on a scale in advance in accordance with a predetermined first principle while establishing degrees thereof; identifying a position on the scale to determine the degree and carrying out a predetermined calculation with respect to the degree; selecting or averaging the calculation result in accordance with a predetermined second principle so as to determine a control value corresponding to the selected or averaged value; and controlling the vehicle operation on the basis of the value.
Claim 2
Independent Claim
89 words
A method for controlling vehicle operation, which comprises: assigning operating conditions of the vehicle on a scale in advance in accordance with a predetermined first principle while establishing degrees thereof; identifying a position on the scale to determine the degree and carrying out a predetermined calculation with respect to the degree; selecting or averaging the calculation result in accordance with a predetermined second principle so as to determine a control value corresponding to the selected or averaged value; and controlling the vehicle operation on the basis of the value.
Claim 3
Dependent Claim
24 words
A method according to claim 1 wherein the vehicle operating conditions are divided into 2n + 1 subdivisions, where n is a positive integer.
Claim 4
Dependent Claim
21 words
A method according to claim 1 or 2 wherein the vehicle operating conditions are assigned on one and the same scale.
Claim 5
Dependent Claim
16 words
A method according to claim 1, 2 or 3 wherein the averaging is a weighted averaging.
Claim 6
Independent Claim
30 words
A method according to any preceding claim wherein the predetermined first principle is to assign the vehicle operation conditions such that they extend from the smallest region to the largest.
Claim 7
Independent Claim
16 words
A method according to any preceding claim where the predetermined second principle is a mini-max calculation.
Claim 8
Independent Claim
16 words
A method according to any preceding claim wherein said vehicle operation control is a cruise control.
Claim 9
Dependent Claim
30 words
A method according to claim 7 wherein said vehicle operating conditions are a difference in vehicle speed between a predetermined speed and a current speed, and acceleration of the speed.
Claim 10
Independent Claim
98 words
A system for controlling vehicle operation, which comprises: means for detecting operating conditions of the vehicle disposed at an appropriate part of the vehicle; means for receiving the output of the detecting means and for calculating a control value required for vehicle operation; and means for receiving the output of the calculating means and for driving a device required for vehicle operation; said calculating means identifying a current position on a scale onto which operating conditions have been assigned with a degree and calculating a control value with respect to the degree in accordance with a predetermined principle.
Claim 11
Independent Claim
98 words
A system for controlling vehicle operation, which comprises: means for detecting operating conditions of the vehicle disposed at an appropriate part of the vehicle; means for receiving the output of the detecting means and for calculating a control value required for vehicle operation; and means for receiving the output of the calculating means and for driving a device required for vehicle operation; said calculating means identifying a current position on a scale onto which operating conditions have been assigned with a degree and calculating a control value with respect to the degree in accordance with a predetermined principle.
Claim 12
Dependent Claim
14 words
A system according to claim 9 wherein the predetermined principle is fuzzy set calculation.
Claim 13
Dependent Claim
17 words
A system according to claim 9 or 10 wherein said vehicle operation control is a cruise control.
Claim 14
Dependent Claim
33 words
A system according to claim 9, 10 or 11 wherein said vehicle operating conditions are a difference in vehicle speed between a predetermined speed and a current speed, and acceleration of the speed.
Claim 15
Independent Claim
134 words
A method for controlling vehicle operation, comprising: (a) assigning in advance parameters (P₁, P₂ etc.) representing different operating conditions associated with the vehicle on a scale of values (-Pl-n, -Pl - n + 1 etc) thereof; (b) determining in advance for a range of values of each parameter the degrees (µl-n etc) with respect to a number of fuzzy label sets (NB, NM etc); (c) detecting actual values of said vehicle operating conditions and identifying the positions thereof with respect to the scale of parameters; (d) identifying the corresponding membership degrees ( µ 1-n etc.) with respect to the fuzzy label sets (NB, NM etc.) for values of the parameters (P₁, P₂ etc.) which correspond to the detected operating condition values; and (e) calculating from said membership degrees a signal for controlling the vehicle.
Claim 16
Independent Claim
134 words
A method for controlling vehicle operation, comprising: (a) assigning in advance parameters (P₁, P₂ etc.) representing different operating conditions associated with the vehicle on a scale of values (-Pl-n, -Pl - n + 1 etc) thereof; (b) determining in advance for a range of values of each parameter the degrees (µl-n etc) with respect to a number of fuzzy label sets (NB, NM etc); (c) detecting actual values of said vehicle operating conditions and identifying the positions thereof with respect to the scale of parameters; (d) identifying the corresponding membership degrees ( µ 1-n etc.) with respect to the fuzzy label sets (NB, NM etc.) for values of the parameters (P₁, P₂ etc.) which correspond to the detected operating condition values; and (e) calculating from said membership degrees a signal for controlling the vehicle.
References Cited (Backward Citations)
US3983954A
Cited
JPS599740A
Cited
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