Device for the majority of the selection signals

 

(57) Abstract:

The invention relates to automatic control and computer engineering and is intended for use in high-reliability redundant devices. The purpose of the invention is to increase the reliability issue right result. The device contains three cases, three elements of comparison, the three elements, three elements OR NOT, the majority bloc, majoritarian element, three dip switch. The essence of the invention is to increase the validity of the issuance to subscriber the right result by eliminating the influence of false alarm of failure of one of the spare blocks in the output code. If the controls of one of the redundant blocks generate a signal failure, and the unit thus generates code that matches the code of one of the other two channels, it is assumed that a fault signal has been generated incorrectly. A fault signal in this case is ignored, register this block does not translate into zero (single) condition and the code issued by the data block is taken into account when generating the output code. 2 Il.

The invention relates to automatic control and computer engineering and is intended for use in high-reliability redundant is the device for the majority of the signal is selected.

The disadvantage of this device is the low reliability of issuing the correct result, which is defined as follows. In the device, it is assumed that the signals of the redundant control units always give accurate information about the status of the blocks. However, be aware that the equipment diagnosis may refuse, and therefore, the control inputs may receive a "failure" signal when the corresponding block is in good condition, and Vice versa. This fact becomes even more evident if we consider that the diagnostic equipment may take up to 30% volume computing unit. In the case of forming one of the redundant blocks false "failure" signal, the subscriber may receive a false signal (code).

The aim of the invention is to increase the reliability issue right result.

The essence of the invention is to increase the validity of the issuance to subscriber the right result by eliminating the influence of false alarm of failure of one of the spare blocks in the output code.

In other words, if the control means of one of the redundant blocks generate a signal failure, and the unit thus Siderno. A fault signal in this case is ignored, register this block does not translate into zero (single) condition and the code issued by the data block is taken into account when generating the output code.

In Fig.1 shows a functional diagram of the inventive device of Fig. 2 is a functional diagram of a majority block.

The device (Fig. 1) contains the first 1, second 2 and third 3 registers, the first 4, second 5 and third 6 elements of comparison, the first 7, second 8 and third 9 items And the majority element 10, the majority of the block 11, the first 12 and second 13 and third 14 elements OR NOT, information inputs 15-17, inputs 18-20 control input 21 of the synchronization information output 22, the first, second and third dip switches 23, 24, 25.

The majority of the block 11 (Fig. 2) contains a switch 26, the decoder 27, a majority element 28. The information input unit 11 is connected to the inputs of the majority element 28 and to respective inputs of the switch 26. The output of the majority element 28 is connected to the input of the switch 26.

Registers 1-3 are designed to receive and store information from the respective redundant blocks. The recording of information in the registers 1-3 is on the trailing edge and is 23(24, 25) is between the output element And 7(8, 9) and the input R, ward a single signal all the bits of register 1(2, 3) are set in the zero state. If the switch 23(24, 25) stands at the entrance to S, the single signal all the bits are set to one state.

Items 4-6 comparison is intended to compare the codes issued by the redundant blocks to the inputs of 15-17. On item 4 comparison of the received codes with inputs 15, 16, item 5 comparison with inputs 16, 17 and element 6 comparison with inputs 15, 17. Thus, on the elements of comparison performed a pairwise comparison of the codes from all the redundant blocks. The outputs of the elements 4-6 comparison appear isolated signals in the case of coincidence of the codes. Work items 4-6 comparison is permitted only when the inputs 18-20 receives signals refusal not more than one failed redundant block.

Elements And 7-9 are designed to supply control signals on the installation inputs of registers 1-3, respectively. Allowed to pass signals of failure with inputs 18-20 if the device has received two such signal, and when the device has received a signal of failure, but all the codes issued by the redundant blokada.

The majority element 10 is designed to generate a zero signal when the device inputs 18-20 received two or more fault signal channels.

The majority of the block 11 is designed to generate reliable code at exit 22 in accordance with the control signals received at its inputs 23, 24. Code "PA" corresponds to a majority of the processing mode signals for informational inputs. Code "10" indicates that a workable remains only the first redundant block, and therefore, its information must be output at output 22. Code "11" corresponds to the state when working only the second block, the code "01" is the third redundant block.

The element OR NOT 12 is designed to generate a single signal, when three redundant units two refused and one third. The element OR NOT 13 is designed to generate a single signal in case of the three redundant units two refused and one of them first. The element OR NOT 14 is designed to generate a single signal in the case where the device from the redundant blocks are received conflicting codes.

The device operates as follows.

In the initial state nespravny and are in working condition. The output of majority element 10 individual signal which enables the elements 4-6 comparison. The outputs of the elements OR NOT 12, 13 also zero signals which are fed to the control inputs of the majority of the block 11. Zero code majoritarian unit 11 operates as majorityowned codes received at its data inputs.

Redundant blocks provide information in the form of parallel codes on inputs 15-17. On the trailing edge of the clock input 21 these codes are recorded in the appropriate registers 1-3. In addition, they arrive at the inputs of the elements 4-6 comparison, where pairs are compared.

For parallel operation of the device requires that codes for informational inputs 15-17 and control signals from the inputs 18-20 were pauses between the pulses from input 21.

Failure of one of the blocks corresponding to a single signal appears on one of the inputs of 18-20. But if the device has received two of the same code, as evidenced by a single signal at the output of one of the elements 4-6 comparison, the output of the element OR NOT 14 the zero signal. This signal prevents the installation of the register of the failed channel to zero (single) value. Wrong code with the release of this Regis unit refused, and the other failed), then the output of the element OR NOT 14 single signal. This signal opens the elements And 7-9, and the control signal of the failed channel sets the corresponding register in the zero state (single). The device in this case, the output 22 generates an output signal preferred status equal to that installed at the output of the register is inoperative unit (if the switch 23(24, 25) is installed between the output element And 7 (8, 9) and input R, the outputs of the register is 1 (2, 2) are set to "0" if the switch is set with the output element And 7 (8, 9) on the S input register 7 (8, 9), its bits are set to "1"). Thus, the scheme allows to obtain at the output of either "0" or "1", i.e., the preferred value, which is less dangerous for this particular control object.

When signals about the failure of any two blocks on the output of the majority element 10, you receive a zero signal, which disables the operation of the elements 4-6 comparison and opens the items OR NOT 12, 13. If it remains operational the first block, the output of the element OR NOT 12 individual signal, and the output of the element OR NOT 13 single signals. In case of failure of the second and first bastuba to the inputs 29, 30 the majority of block 11, switch its mode majorityowned mode switching on the output information signal intact block.

Thus, the introduction of controls comparison allows to perceive a false signal rejection, issued by one of the redundant blocks.

DEVICE FOR the MAJORITY of the SELECTION SIGNAL containing the first and second elements OR NOT, and outputs connected respectively to the first and second control inputs of the majority of the block associated first, second and third groups of information inputs with outputs respectively of the first, second and third registers, the group of information inputs of which are respectively first, second and third information input device serving to connect the information outputs of the redundant blocks, the majority element, the first, second and third inputs of which are the respective control inputs of the device serving to connect the signal outputs of the operational state of the redundant blocks, the output of the majority block is an information output device, characterized in that the device entered three elementaryage element connected with the first inputs of the first and second elements OR NOT with the enable inputs of the comparison of the first, second and third blocks of the comparison, the connected outputs are equal to the corresponding inputs of the third element OR NOT connected to the first inputs of the first, second and third elements And outputs connected to the inputs respectively of the first, second and third two-position switches, each of which is associated with the first and second outputs from the installation inputs respectively the zero and unit of the state of the corresponding register, the enable inputs of the first, second and third registers are combined and input synchronization device, the first group of information inputs of the first and third elements of comparison and United are the first information input device, the first group of information inputs of the second unit of comparison and the second group of information inputs of the first unit of comparison are combined and the second information input device, the second group of information inputs of the second and third units of comparison are combined and the third information input of the inverted inputs of the first and second elements OR NOT are respectively the third and the first entry checkpoints for important locations

 

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