Claims
- 1. Process for actuating a brake pressure control device to achieve a desired pressure p*, said process comprising the following steps:
- measuring the pressure controlled by the pressure control device at control time points k, (k+1), . . . . separate by control intervals T.sub.A and generating corresponding brake pressure signals (k), P(k+1), . . . . ,
- generating a desired pressure signal P*(k), P*(k+1) . . . . at time points k, (k+1), . . . . ,
- storing the measured pressure signals P(k), P(k+1), . . . . during the following intervals T.sub.A,
- calculating in the control interval T.sub.A following the time point (k+1), a pressure bounce .DELTA.P(k+1) as the difference P*(k+1)-P(k),
- determining actuating value .DELTA.T(k+1) from the pressure bounce .DELTA.P(k+1) according to the relationships ##EQU6## wherein b.sup.+ /b.sup.- are gain factors and TO.sup.+ /TO.sup.- are response times of the pressure control device estimated from former pressure bounces P(j-1)-P(j-2), p(j)-P(j-1), . . . . and former actuating values .DELTA.T(j-1), .DELTA.T(j) . . . . at identification time points (j-1), j, . . . and
- actuating said control device for a time corresponding to .vertline..DELTA.T(+1).vertline..
- 2. Process in accordance with claim 1 further comprising checking whether the brake pressure control device responded to the last formed control signal .DELTA.T(k) and in case of no response, determining an estimated value TO(j) from the last determined response time TO(j-1) and the control signal .DELTA.T(j) using weighing factors Sm.
- 3. Process in accordance with claim 1 wherein b.sup.+ /b.sup.- and TO.sup.+ /TO.sup.- are functions of j recovered according to the equation
- b.sup.+ (j)=(y(y)*x(j)+u.sup.2 *b.sup.+ (j-1)/(x(j).sup.2 +u.sup.2),
- TO.sup.+ (j)={(.DELTA.T(j)*z.sup.+ (j-1)-.DELTA.T(j-1) *z.sup.+ (j))*y(j)+v.sup.2 *TO.sup.+ (j-1)}/(y(j).sup.2 +v.sup.2)
- b.sup.- (j)=(y(j)*x(j)+u.sup.2 .multidot.b.sup.- (j-1)/(x(j).sup.2 +u.sup.2)
- TO.sup.- (j)={(.DELTA.T(j)*z.sup.- (j-1)-.DELTA.T.sup.- (j-1)* z.sup.- (j))*y(j)+v.sup.2 *T.sub.o.sup.- (j-1)}/(y(j).sup.2 +v.sup.2)
- wherein
- x(j)=.DELTA.T(j)-.DELTA.T(j-1)
- y(j)=z(j)-z(j-1)
- z(j)=P(k)-P(k-1)
- and u and v are constants.
- 4. Process as in claim 1 wherein said device comprises an inlet valve and an outlet valve, said inlet valve being opened for a time .vertline..DELTA.T(k+1).vertline. when P*(k-1)>P(k), said outlet valve being opened for a time .vertline..DELTA.T(k+1).vertline. when P*(k+1)<P(k).
Priority Claims (1)
Number |
Date |
Country |
Kind |
3731076 |
Sep 1987 |
DEX |
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Parent Case Info
This application is a continuation of application Ser. No. 07/466,371, filed Apr. 16, 1990, now abandoned.
PCT Information
Filing Document |
Filing Date |
Country |
Kind |
102e Date |
371c Date |
PCT/EP88/00843 |
9/15/1988 |
|
|
4/16/1990 |
4/16/1990 |
Publishing Document |
Publishing Date |
Country |
Kind |
WO89/02384 |
3/23/1989 |
|
|
US Referenced Citations (3)
Foreign Referenced Citations (4)
Number |
Date |
Country |
0188686 |
Jul 1986 |
EPX |
0226803 |
Jul 1987 |
EPX |
0233360 |
Aug 1987 |
EPX |
8902384 |
Mar 1989 |
WOX |
Continuations (1)
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Number |
Date |
Country |
Parent |
466371 |
Apr 1990 |
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