Apparatus for recovering sequentially controlled apparatus

• US 5,111,383 A
• Filed: 09/27/1989
• Issued: 05/05/1992
• Est. Priority Date: 09/30/1988
• Status: Expired due to Fees

• Current Assignee: Toyo Advanced Technologies Co.,Ltd (Itochu Corporation)
• Original Assignee: Mazda Motor Corporation
• Inventors: Kimura, Katsunori, Nishimura, Yoshitaka, Hata, Shinichi
• Primary Examiner(s): RUGGIERO, JOSEPH F
• Application Number:
  US07/412,820
• Time in Patent Office: 951 Days
• Field of Search: 364/184-187, 364/140-147, 364/474.16, 364/474.19, 364/136, 364/551.01, 364/551.02, 318/563-565, 371/29.1
• US Class Current: 700/79
• CPC Class Codes: G05B 19/0428 Safety, monitoring G05B19/0423 takes precedence

Abstract

An automatic operation recovery system for automatically removing an operational failure caused in an apparatus whose complete operation is controlled by actuators operated in a predetermined sequence, thereby recovering the apparatus to its normal operating condition, comprises an actuator driver for controllably driving the actuators in a sequence suitable for a type of operational failure so as to remove the operational failure, a memory for accumulatively storing data of a type of operational failure and a sequence taken to remove the type of operational failure through the actuator driver and an automatic recovery controller for, when an operational failure is detected, assigning an order of priority to sequences available for removing the same type of operational failure accumulatively stored in the memory and automatically actuating the actuator driver to operate the actuators in a sequence assigned the first order of priority.

Claims

1. An automatic normal operation recovery system used in cooperation with a sequentially controlled apparatus having a plurality of actuators which are operated in a predetermined sequence to perform a sequential operation of said sequentially controlled apparatus for automatically removing an operational failure caused in said sequentially controlled apparatus by actuating said actuators, thereby recovering said sequentially controlled apparatus to its normal operating condition, said recovery system comprising;

operational failure detecting means for detecting an occurrence and a type of an operational failure caused in said sequentially controlled apparatus;

actuator operating means for operating said actuators in a sequence suitable for a type of operational failure detected by said operational failure detecting means so as to remove said type of operational failure, thereby recovering said sequentially controlled apparatus to its normal operating condition;

memory means for accumulatively storing data of a type of operational failure detected by said operational failure detecting means and a sequence taken to remove said type of operational failure through said manual recovery means; and

automatic recovery means for, when an operational failure is detected by said operational failure detecting means, assigning an order of priority to all sequences available for removing the same type of operational failure as said operational failure detected by said operational failure detecting means accumulatively stored in said memory and automatically actuating said actuator operating means to operate said actuators in a sequence assigned the first order of priority.

2. An automatic normal operation recovery system as defined in claim 1, wherein said actuator operating means is changed between a manual operating mode and an automatic operating mode.

3. An automatic normal operation recovery system as defined in claim 2, wherein said memory means accumlatively stores data of a sequence manually taken when said actuator operating means is in said manual operating mode, or automatically taken when said actuator operating means is in said manual operating mode, to rermove an operational failure through said manual recovery means.

4. An automatic normal operation recovery system as defined in claim 3, wherein said automatic recovery means repeats a predetermined number of times said automatic actuation of said actuator operating means unless an operational failure is not removed.

5. An automatic normal operation recovery system as defined in claim 4, wherein said actuator operating means is changed into said manual operating mode when an operational failure is not removed before said predetermined number of times of automatic actuation of said actuator operating means by said automatic recovery means.

6. An automatic normal operation recovery system as defined in claim 1, wherein said automatic recovery means assigns each said sequence an order of priority based on at least one of parameters of a probability of recovery P which is a ratio of the number of successful removals of a same type of operational failure by each said sequence relative to the total number of trials of each said sequence for said same type of operational failure, a recovery time T which is a period of time needed to successfully remove said same type of operational failure by each said sequence, and the number of operations N for actuating said actuators.

7. An automatic normal operation recovery system as defined in claim 6, wherein said order of priority is determined based on an evaluation value E which is calculated by the use of the following algebraic equation for each said sequence:

space="preserve" listing-type="equation">E=1a.sub.1 ×

Pe+a.sub.2 ×

Te+Ne

wherein a₁ and a₂ are weighting coefficients and a₁ >

a₂ ;

Pe is an evaluation point depending upon said probability of recovery P;

Te is an evaluation point depending upon said recovery time T; and

Ne is an evaluation point depending upon said number of operations N.

8. An automatic normal operation recovery system as defined in claim 7, wherein said evaluation points are given as follows:

space="preserve" listing-type="tabular">______________________________________ P (%) Pe T (sec) Te N Ne ______________________________________ 100-91 10 0-5 10 1 10 90-81 9 6-10 9 2 9 80-71 8 11-15 8 3 8 70-61 7 16-20 7 4 7 60-51 6 21-25 6 5 6 50-41 5 26-30 5 6 5 40-31 4 31-35 4 7 4 30-21 3 36-40 3 8 3 20-11 2 41-45 2 9 2 10-0 1 46- 1 10- 1 ______________________________________

9. An automatic normal operation recovery system as defined in claim 8, wherein said weighting coefficients a₁ and a₂ are 3 and 2, respectively.

10. An automatic normal operation recovery system as defined in claim 8, wherein the larger said evaluation value E for a sequence is, the higher said order of priority of said sequence is.