CN100487609C - Alternative input control method and device - Google Patents

Alternative input control method and device Download PDF

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Publication number
CN100487609C
CN100487609C CNB2006101513946A CN200610151394A CN100487609C CN 100487609 C CN100487609 C CN 100487609C CN B2006101513946 A CNB2006101513946 A CN B2006101513946A CN 200610151394 A CN200610151394 A CN 200610151394A CN 100487609 C CN100487609 C CN 100487609C
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input
voltage
value
controll plant
relay
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CN1900853A (en
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吉田有里
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Denso Corp
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Denso Corp
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Abstract

An electronic control unit determines whether a level of a battery supply voltage is low, and whether a feedback system of a door lock control device is in an abnormal state. If the level of the battery supply voltage is determined to be low, or if the feedback system of the door lock control device is determined to be in the abnormal state, the electronic control unit performs alternative input processing. Internal control information, which is used by the electronic control unit for controlling a controlled object, is used for obtaining an alternative input value.

Description

Replace input control method and device
Technical field
The present invention relates to a kind of method and apparatus that is used for controlling to when low replacement (alternative) input of electronic control unit (ECU) at the level of battery supply voltage.The invention still further relates to the replacement input control method under the abnormality of the feedback system of ECU and replace input control device.
Background technology
When traditional electronic control unit (ECU) carried out break-make control with relay (relay) as controll plant, ECU output control signal was given relay (for example, JP8-192723A).Then, the input voltage that will be input in the relay load is fed back to the ECU from relay.Based on this input voltage, definite (affirmation) relay of ECU is actually and is switched on or is turned off.Fig. 3 understands that for example the ON/OFF (on/off) of relay determines, when the level of the input voltage in feeding back to ECU is low, determines that relay is turned off.When input voltage was in earth level (being 0V), relay was turned off.When input voltage was in the level (being 12V) of the battery supply voltage of ECU, relay was switched on.Given above-mentioned input voltage level is determined threshold voltage V if this input voltage is equal to or higher than ON ON(being 4.2V) determines that then relay is switched on, and determines threshold voltage V if this input voltage is equal to or less than OFF OFF(being 2.8V) determines that then relay is turned off.Because this reason, when input voltage at V OFFAnd V ONBetween the time (when input voltage during) greater than 2.8V and less than 4.2V, can not determine that relay is confirmed as connecting or turn-offing.
In addition, for traditional ECU, at the level of the battery supply voltage+B that is applied to ECU because the loss of on-vehicle battery and step-down, because starting makes under the instantaneous voltage under the degradation situation, the ON/OFF that might correctly carry out relay is definite.That is to say that when the level step-down of battery supply voltage+B, the input voltage level of relay determined mistakenly by ECU probably, and is input among the ECU improperly, thereby make and to realize that input is about the adequate information of vehicles state in ECU.For example, when becoming, battery supply voltage+B of the main body ECU that controls vehicles chassis determines threshold voltage V less than ON ONWhen (being 4.2V), will determine that mistakenly relay is turned off, and probably no matter the fact that in fact is switched on of relay and the incorrect information that relay is turned off is input among the main body ECU.Therefore, the mistake of relay status is determined and incorrect input will cause and use the input value of those representatives and vehicles virtual condition and vehicles state inequality to control ECU.As a result, this control will can not realize user's expectation, and/or relay itself will move (for example, may connect the ceiling light as the relay load) improperly.
In addition, also have the mechanical hook-up use control output, and determine the ECU of controll plant state based on input signal, described input signal is to feed back from the controll plant such as switch.In above-mentioned mechanical hook-up and ECU, owing to the reasons such as open circuit fault in the feedback system, the exceptional value that feeds back among the ECU and indicate the input signal of controll plant state to have to be in abnormality (for example, input value may be uncertain, and perhaps input value may be fixed on the high level or be fixed on the low level).Therefore, suggestion is used a kind of load drive device that detects load cut-off (for example, JP2001-037069A).Yet, the abnormality of the feedback system that input signal is fed back from controll plant, represent the input value of controll plant virtual condition not to be imported among the ECU according to this device.
Therefore, the abnormality of the feedback system that input signal is fed back from controll plant, although in fact controll plant is correctly controlled and is in suitable state, represent the input value of the state mutually not different still to be imported among the ECU with the controll plant virtual condition.Therefore, ECU might control the equipment that comprises controll plant as the user desiredly, and as its as a result these equipment itself may move improperly.
Summary of the invention
The present invention is devoted to solve above-mentioned shortcoming.Therefore, first purpose of the present invention provides a kind of replacement input control method and a kind of replacement input control device.Come the state of monitoring battery supply voltage by this replacement input control method and replacement input control device.In addition, alternatively be input among the ECU with previously stored input value or from the supposition input value that is stored in the internal control information acquisition among any one ECU.
Except first purpose, second purpose of the present invention provides a kind of replacement input control method and a kind of replacement input control device.By the abnormality of determining the feedback system of controll plant according to the replacement input control method and the replacement input control device of second purpose, wherein control by ECU to the output of controll plant.In addition, suppose the virtual condition of controll plant, and will represent that the supposition input value of supposition state alternatively is input among the ECU based on the internal control information that is stored among any one ECU.
In order to realize first purpose of the present invention, provide a kind of electronic control unit that controll plant is carried out break-make control.This electronic control unit determines that battery supply voltage equals or greater than assigned voltage.If battery supply voltage is less than assigned voltage, this electronic control unit comprises one of following operation.That is, if this electronic control unit positive output control signal is connected controll plant, then this electronic control unit is arranged to input voltage based on control signal information the ON value of indicating controll plant to be switched on.If this electronic control unit positive output control signal is turn-offed controll plant, then this electronic control unit is arranged to input value based on control signal information the OFF value of indicating controll plant to be turned off.
In order to realize second purpose of the present invention, provide a kind of electronic control unit that controll plant is controlled.Based on the input signal that feeds back from controll plant, this electronic control unit determines whether the feedback system of controll plant is in abnormality.If determine that feedback system is in abnormality, then this electronic control unit comprises following operation.That is, this electronic control unit is supposed the state of controll plant based on being stored in internal control information in arbitrary electronic control unit, and the controll plant state of supposition is input in the electronic control unit with being replaced.
Description of drawings
By following description, appended claim and accompanying drawing, the present invention and additional purpose, feature and advantage thereof will be understood best.In the accompanying drawings:
Fig. 1 is a circuit block diagram that show to replace input control device, and this device has been used replacement input control method according to first embodiment of the invention;
Fig. 2 is the process flow diagram that shows according to the base conditioning of first embodiment;
Fig. 3 illustrates the conventional voltage pattern of replacing the operation of input control method;
Fig. 4 is a circuit block diagram that show to replace input control device, and this device has been used replacement input control method according to second embodiment of the invention;
Fig. 5 is the process flow diagram that demonstration is handled according to the input of annex (accessory) input voltage of second embodiment;
Fig. 6 is the process flow diagram that demonstration is handled according to the input of first igniting (ignition) input voltage of second embodiment;
Fig. 7 is the process flow diagram that demonstration is handled according to the input of the second igniting input voltage of second embodiment;
Fig. 8 is the circuit block diagram of show gate lock control device, and this device has been used replacement input control method according to third embodiment of the invention;
Fig. 9 is the door lock output processing flow chart that shows according to the 3rd embodiment; And
Figure 10 shows according to the door lock of the 3rd embodiment to open the output processing flow chart.
Embodiment
Below with reference to accompanying drawing embodiments of the invention are described.
(first embodiment)
As shown in Figure 1, employing comprises according to the replacement input control device of the replacement input control method of first embodiment: electronic control unit (ECU) 1 and the relay 2 that is connected to relay load (not shown).ECU 1 comprises microcomputer 10.Relay 2 carries out break-make control by the relay control signal that produces from microcomputer 10.
Microcomputer 10 has well-known configuration, and it comprises CPU (CPU (central processing unit): not shown), ROM (ROM (read-only memory): not shown), RAM (random access memory: not shown) etc.Microcomputer 10 is carried out the program that is stored among the ROM by CPU and is determined battery supply voltage+B and normal input value is set and the replacement input value.
Microcomputer 10 comprises the sub-10a of relay voltage input end, battery supply voltage monitoring terminal 10b and relay control signal lead-out terminal 10c.The sub-10a of relay voltage input end is input to input voltage VA the microcomputer 10 from an end (that end of relay load-side) of the relay switch of relay 2.Battery supply voltage monitoring terminal 10b is input to battery supply voltage+B in the microcomputer 10.The relay control signal of break-make control is carried out in relay control signal lead-out terminal 10c output to relay 2.
The relay load that comprises annex such as automobile audio and auto-navigation system given electric power supply by relay 2.One end of the relay switch of relay 2 (that end of relay load-side) is connected to the sub-10a of relay voltage input end of microcomputer 10.
Be described hereinafter with reference to the operation of the process flow diagram among Fig. 2 the microcomputer 10 of first embodiment.
When beginning was handled in the output of relay voltage, microcomputer 10 determined whether the battery supply voltage+B that is input to battery supply voltage monitoring terminal 10b is equal to or greater than assigned voltage (that is, 5.3V) (step S1).This moment, also do not determine to determine threshold voltage V between OFF OFF(that is, 2.8V) determine threshold voltage V with ON ON(that is, whether the battery supply voltage+B between 4.2V) is in low-voltage state.
If battery supply voltage+B is equal to or greater than assigned voltage (5.3V) (that is, normal) (S1), microcomputer 10 is carried out normal input and is handled (S2).More particularly, microcomputer 10 determines to be input to the input voltage VA (S3) of the sub-10a of relay voltage input end.If determine that input voltage VA is equal to or greater than ON and determines threshold voltage (4.2V), microcomputer 10 is arranged to the ON value (S4) that indicating relay 2 is switched on input value.If microcomputer 10 determines that input voltage VA is equal to or less than OFF and determines threshold voltage (2.8V), microcomputer 10 is arranged to the OFF value (S5) that indicating relay 2 is turned off with input value.
If battery supply voltage+B less than 5.3V (that is, low-voltage) (S1), then microcomputer 10 is carried out and is replaced input processing (S6).More particularly, microcomputer 10 output relay control signals are taken this by the break-make of relay 2 is controlled the pilot relay load.Based on the information (ECU internal control information) of relevant this relay control signal, the input value (S7) that microcomputer 10 is arranged to the current state (ON or OFF) of relay 2 to suppose.For example, if microcomputer 10 is just exported the OFF signal as relay control signal, suppose that then relay 2 is turned off.Therefore, microcomputer 10 value that will be input to the input voltage VA of the sub-10a of relay voltage input end is arranged to the OFF value (S8) that indicating relay 2 is turned off.If microcomputer 10 is just exported the ON signal as relay control signal, suppose that then relay 2 is switched on.Therefore, microcomputer 10 is arranged to the ON value (S9) that indicating relay 2 is switched on the input value of input voltage VA.
In order to provide stable input to the application program (not shown), the input voltage VA that 10 pairs of microcomputers have been input to the sub-10a of relay voltage input end filters (S10), and will filter input value and be fixed on ON or OFF (S11).For example, input voltage VA can be input in the microcomputer 10 with the interval of 5ms (millisecond).When above-mentioned input is continuous when having identical result 8 times, will filter input value and be fixed on ON or OFF.Handle by this, the mistake that has suppressed to be caused by noise is determined.
Microcomputer 10 is determined the filtration input values (S13) that have been fixed, and by the application program of carrying out it according to definite result (OFF or ON) control an equipment (S14, S15).
Microcomputer 10 is alternatively imported the abnormality information (previously stored input value) before that falls into.And microcomputer 10 is alternatively imported the input value of supposition based on being stored in internal control information among arbitrary ECU.Fall into the information before the abnormality or the input value of supposition and be input to the sub-10a of relay voltage input end with being replaced, the sub-10a of this relay voltage input end carries out determining mistakenly and importing improperly in low-voltage state.Therefore, can obtain the replacement input value of that represent traffic instrument virtual condition more accurately.As a result, determining to reach incorrect input with traditional mistake and compare, is possible to control relay 2, that will realize user's expectation.
For pilot relay 2, described in the present embodiment: if feed back to the level of the input voltage VA among the sub-10a of relay voltage input end is that low (that is, less than assigned voltage: 5.3V), ON/OFF relay 2, that be confirmed as turn-offing determines.Alternatively, when the level of input voltage VA when being high, can adopt ON/OFF similar, that be confirmed as connecting to determine to relay.
(second embodiment)
As shown in Figure 4, the circuit according to the replacement input control device of second embodiment of the invention comprises: ECU1, annex relay 20, first ignition relay 21 and second ignition relay 22.ECU 1 comprises microcomputer 10 and holding circuit 11.Come this annex relay 20 is carried out break-make control by the annex relay control signal that produces from microcomputer 10.Come first and second ignition relay 21,22 are carried out break-make control by the ignition relay control signal that produces from holding circuit 11.Microcomputer 10 has well-known configuration, and it comprises: CPU (not shown), ROM (not shown), RAM (not shown) etc.Carry out the program be stored among the ROM by CPU and realize replacement input control method according to present embodiment.
Microcomputer 10 has the sub-10a of annex relay voltage input end, battery supply voltage monitoring terminal 10b, annex relay control signal lead-out terminal 10c, the sub-10d of the first ignition relay voltage input end, the sub-10e of the second ignition relay voltage input end, keeps the sub-10f of pulse signal output end, the cancellation sub-10g of pulse signal output end and holding circuit status signal input terminal 10h.
The sub-10a of annex relay voltage input end is input to input voltage VA the microcomputer 10 from an end (that end of annex relay load-side) of the relay switch of annex relay 20.Battery supply voltage monitoring terminal 10b is input to battery supply voltage+B in the microcomputer 10.Annex relay control signal lead-out terminal 10c output attachments relay control signal takes this annex relay 20 is carried out break-make control.The sub-10d of the first ignition relay voltage input end is with input voltage V Ig1 end (first that end of ignition relay load-side) from the relay switch of first ignition relay 21 is input to the microcomputer 10.The sub-10e of the second ignition relay voltage input end is with input voltage V Ig2 ends (second that end of ignition relay load-side) from the relay switch of second ignition relay 22 are input to the microcomputer 10.
Keep the sub-10f of pulse signal output end will keep pulse signal P1 to output to holding circuit 11.The sub-10g of cancellation pulse signal output end will cancel pulse signal P2 and output to holding circuit 11.Holding circuit status signal input terminal 10h is input to the holding circuit status signal P3 (a kind of signal that keeps set condition or cancellation state of indicating) of holding circuit 11 in the microcomputer 10.
Holding circuit 11 comprises the sub-11a of maintenance pulse signal input terminal, the sub-11b of cancellation pulse signal input terminal, holding circuit status signal lead-out terminal 11c and ignition control signal lead-out terminal 11d.Keep the sub-11a input of pulse signal input terminal to keep pulse signal P1, this signal is to export from the sub-10f of the maintenance pulse signal output end of microcomputer 10.The sub-11b input of cancellation pulse signal input terminal cancellation pulse signal P2, this signal is to export from the sub-10g of the cancellation pulse signal output end of microcomputer 10.Holding circuit status signal lead-out terminal 11c output holding circuit status signal P3, this signal will be input to the holding circuit status signal input terminal 10h of microcomputer 10.Ignition control signal lead-out terminal 11d outputs to first and second ignition relay 21,22 with ignition control signal.
When the maintenance pulse signal P1 that is produced by microcomputer 10 was imported into holding circuit 11, holding circuit 11 generated and keeps trigger pip.In this case, holding circuit 11 begins to provide the ignition relay control signal, and this signal is the control signal (drive current) of first and second ignition relay 21,22 being carried out break-make control.Even after keeping the trigger pip disappearance, holding circuit 11 still continues to provide the ignition relay control signal, promptly drives the electric current of first and second ignition relay 21,22.
When importing the cancellation pulse signal P2 that is produced by microcomputer 10, holding circuit 11 generates the cancellation trigger pips.In this case, holding circuit 11 stops to provide the ignition relay control signal, and this signal is the control signal (drive current) of first and second ignition relay 21,22 being carried out break-make control.Thereby, when under the maintenance pulse signal P1 from microcomputer 10 is not having the normal condition of influences such as noise, being imported into holding circuit 11, holding circuit 11 begins output igniting relay control signal (promptly, ignition relay control signal ON), take this connection first and second ignition relay 21,22.Then, holding circuit 11 continues to provide ignition relay control signal ON to first and second ignition relay 21,22, till the cancellation pulse signal P2 of input from microcomputer 10.
Compare with the configuration that does not for example possess holding circuit 11, replacement input control apparatus with holding circuit 11 has advantage, wherein by the supply that comes controlling and driving electric current (it drives first and second ignition relay 21,22) from the control signal of microcomputer 10.In the sort of configuration, when since noise etc. when causing control signal from microcomputer 10 to be turned off, will be easy to stop power supply, even under the state that should power continuously.When vehicle just in motion, might this thing happens.On the other hand, when the replacement input control device has holding circuit 11, in case microcomputer 10 outputs keep pulse signal P1, holding circuit 11 just continuous output point fire relay control signal ON are till microcomputer 10 output cancellation pulse signal P2.Therefore, the unconscious power supply failure in the time of can being suppressed at vehicle '.
Annex relay 20 is given the load of annex relay with electric power supply, and described load comprises the annex such as vehicle audio and auto-navigation system.One end of the relay switch of annex relay 20 (that end of annex relay load-side) is connected to the sub-10a of annex relay voltage input end of microcomputer 10.
The first ignition relay load that first ignition relay 21 is given vehicle chassis with electric power supply, all illumination and power-operated window for vehicle in this way.One end of the relay switch of first ignition relay 21 (first that end of ignition relay load-side) is connected to the sub-10d of the first ignition relay voltage input end of microcomputer 10.
Second ignition relay 22 is with the second ignition relay load of electric power supply to drive system, all engines in this way.One end of the relay switch of second ignition relay 22 (second that end of ignition relay load-side) is connected to the sub-10e of the second ignition relay voltage input end of microcomputer 10.
Be described hereinafter with reference to the operation of the process flow diagram shown in Fig. 5-7 present embodiment.
(1) annex relay 20 (Fig. 5)
Whether battery supply voltage+B that microcomputer 10 is determined to be input among the battery supply voltage monitoring terminal 10b is equal to or greater than assigned voltage (that is, 5.3V) (S101).
If battery supply voltage+B is equal to or greater than assigned voltage (5.3V) (that is, normal), microcomputer 10 is carried out normal input and is handled (S102).More particularly, microcomputer 10 determines to be input to the annex input voltage VA (S103) among the sub-10a of annex relay voltage input end.
If determine that annex input voltage VA is equal to or greater than ON and determines that (that is, 4.2V), microcomputer 10 is arranged to the input value of annex input voltage the ON value (S104) of indicating annex relay 20 to be switched on to threshold voltage.If microcomputer 10 determines that annex input voltage VA are equal to or less than OFF and determine that (that is, 2.8V), microcomputer 10 is arranged to the input value of annex input voltage VA the OFF value (S105) of indicating annex relay 20 to be turned off to threshold voltage.
If battery supply voltage+B less than 5.3V (that is, low-voltage) (S101), microcomputer 10 is carried out and is replaced input processing (S106).More particularly, microcomputer 10 output attachments relay control signals are taken this by the break-make of annex relay 20 being controlled the load of annex relay.Based on the information (ECU internal control information) of relevant this annex relay control signal, the input value (S107) that microcomputer 10 is arranged to the current state (ON or OFF) of annex relay 20 to suppose.
For example, if microcomputer 10 just outputs to annex relay 20 with the OFF signal as the annex relay control signal, suppose that then annex relay 20 is turned off.Therefore, microcomputer 10 value that will be input to the annex input voltage VA among the sub-10a of annex relay voltage input end is arranged to the OFF value (S108) of indicating annex relay 20 to be turned off.If microcomputer 10 just outputs to annex relay 20 with the ON signal as the annex relay control signal, suppose that then annex relay 20 is switched on.Therefore, microcomputer 10 input value that will be input to the annex input voltage VA among the sub-10a of annex relay voltage input end is arranged to the ON value (S109) of indicating annex relay 20 to be switched on.
In order to provide stable input to the application program (not shown), the annex input voltage VA that 10 pairs of microcomputers have been input among the sub-10a of annex relay voltage input end filters (S110), and annex is filtered input value is fixed on ON or OFF (S111).For example, annex input voltage VA can be input in the microcomputer 10 with the interval of 5ms (millisecond).When above-mentioned input is continuous when having identical result 8 times, annex is filtered input value be fixed on ON or OFF.
Microcomputer 10 determines that the annex that has been fixed at step S111 filters input value (S113).Then, (S114 S115), wherein adds the annex relay load that changes to microcomputer 10 on this equipment by controlling this equipment according to the application program of determining result (OFF or ON) actuating equipment.
Therefore, in the time of under the level at battery supply voltage+B is low state, can't being input to suitable annex input voltage VA in the microcomputer 10, can replace the input value that input value obtain to be similar to the value under the normal battery power state by supposition.Suppose the replacement input value based on the information relevant internal control information of which side (opening or closing) output attachments relay control signal of microcomputer 10 forward annex relays 20 (that is, about) with the annex relay control signal of ECU 1.
(2) first ignition relay 21 (Fig. 6)
Microcomputer 10 determines whether the battery supply voltage+B that is input to battery supply voltage monitoring terminal 10b is equal to or greater than assigned voltage (that is, 5.3V) (S201).
If battery supply voltage+B is equal to or greater than assigned voltage (5.3V) (that is, normal voltage) (S201), microcomputer 10 is carried out normal input and is handled (S202).More particularly, microcomputer 10 determines to be input to the igniting of first among the sub-10d of first ignition relay voltage input end input voltage V Ig1 (S203).Then, if determine the first igniting input voltage V Ig1 is equal to or greater than ON determines threshold voltage (that is, 4.2V), microcomputer 10 is with the first igniting input voltage V Ig1 input value is arranged to the ON value (S204) of indicating first ignition relay 21 to be switched on.Therebetween, if microcomputer 10 is determined the first igniting input voltage V Ig1 is equal to or less than OFF determines threshold voltage (that is, 2.8V), microcomputer 10 is with the first igniting input voltage V Ig1 input value is arranged to the OFF value (S205) of indicating first ignition relay 21 to be turned off.
If battery supply voltage+B less than assigned voltage (5.3V) (that is, low-voltage) (S201), microcomputer 10 is carried out and is replaced input processing (S206).More particularly, ECU 1 (holding circuit 11) output igniting relay control signal is taken this by the break-make of first ignition relay 21 being controlled the first ignition relay load.Therefore, based on the information (ECU internal control information) of relevant ignition relay control signal, the input value (S207) that microcomputer 10 is arranged to the current state (ON or OFF) of first ignition relay 21 to suppose.
For example, if ECU 1 (holding circuit 11) just outputs to first ignition relay 21 with the OFF signal as the ignition relay control signal, suppose that then first ignition relay 21 is turned off.Therefore, microcomputer 10 will be input to the igniting of first among the sub-10d of first ignition relay voltage input end input voltage V Ig1 value is arranged to the OFF value (S208) of indicating first ignition relay 21 to be turned off.If ECU 1 (holding circuit 11) just outputs to first ignition relay 21 with the ON signal as the ignition relay control signal, suppose that then first ignition relay 21 is switched on.Therefore, microcomputer 10 will be input to the igniting of first among the sub-10d of first ignition relay voltage input end input voltage V Ig1 input value is arranged to the ON value (S209) of indicating first ignition relay 21 to be switched on.
10 pairs of microcomputers have been input to the igniting of first among the sub-10d of first ignition relay voltage input end input voltage V Ig1 filters (S210), and the first igniting filtration input value is fixed on ON or OFF (S211), so that provide stable input to the application program (not shown).For example, can be with the first igniting input voltage V Ig1 interval with 5ms (millisecond) is input in the microcomputer 10.When above-mentioned input is continuous when having identical result 8 times, input value is filtered in first igniting be fixed on ON or OFF.
Microcomputer 10 determines that it is ON or OFF (S213) that input values are filtered in first igniting, and determines that according to this result (OFF or ON) controls to lamp differently that (S214 S215), wherein adds the first ignition relay load that changes on lamp.For example, can connect ceiling light at S214.
Therefore, when the level at battery supply voltage+B be can't be under the low state with the first suitable igniting input voltage V Ig1 when being input in the microcomputer 10, can replace the input value that input value obtain to be similar to the value under the normal battery power state by supposition.Suppose the replacement input value based on the information relevant (that is, exporting the internal control information of the first ignition relay control signal) about which side (ON or OFF) of ECU 1 (holding circuit 11) forward first ignition relay 21 with the ignition relay control signal of ECU 1.
(3) second ignition relay 22 (Fig. 7)
Microcomputer 10 determines to be input to the value whether battery supply voltage+B among the battery supply voltage monitoring terminal 10b take assigned voltage (that is, 5.3V) or be higher than this value (S301).
If battery supply voltage+B is equal to or greater than assigned voltage (5.3V) (that is, normal voltage) (S301), microcomputer 10 is carried out normal input and is handled (S302).
More particularly, microcomputer 10 determines to be input to the igniting of second among the sub-10e of second ignition relay voltage input end input voltage V Ig2 (S303).Then, if determine the second igniting input voltage V Ig2 are equal to or greater than ON determines threshold voltage (that is, 4.2V), microcomputer 10 is with the second igniting input voltage V Ig2 input value is arranged to the ON value (S304) of indicating second ignition relay 22 to be switched on.
Therebetween, if microcomputer 10 is determined the second igniting input voltage V Ig2 are equal to or less than OFF determines threshold voltage (that is, 2.8V), microcomputer 10 is with the second igniting input voltage V Ig2 input value is arranged to the OFF value (S305) of indicating second ignition relay 22 to be turned off.
If battery supply voltage+B less than assigned voltage (5.3V) (that is, low-voltage) (S301), microcomputer 10 is carried out and is replaced input processing (S306).More particularly, because ECU 1 (holding circuit 11) output igniting relay control signal is taken this by the break-make of second ignition relay 22 being controlled the second ignition relay load.Therefore, based on the information (ECU internal control information) of relevant ignition relay control signal, the input value (S307) that microcomputer 10 is arranged to the current state (ON or OFF) of second ignition relay 22 to suppose.
For example, if ECU 1 (holding circuit 11) just outputs to second ignition relay 22 with the OFF signal as the ignition relay control signal, suppose that then second ignition relay 22 is turned off.Therefore, microcomputer 10 will be input to the igniting of second among the sub-10e of second ignition relay voltage input end input voltage V Ig2 value is arranged to the OFF value (S308) of indicating second ignition relay 22 to be turned off.If ECU 1 (holding circuit 11) just outputs to second ignition relay 22 with the ON signal as the ignition relay control signal, suppose that then second ignition relay 22 is switched on.Therefore, microcomputer 10 will be input to the igniting of second among the sub-10e of second ignition relay voltage input end input voltage V Ig2 input value is arranged to the ON value (S309) of indicating second ignition relay 22 to be switched on.
In order to provide stable input to the application program (not shown), 10 pairs of microcomputers have been input to the igniting of second among the sub-10e of second ignition relay voltage input end input voltage V Ig2 filter (S310), and the second igniting filtration input value is fixed on ON or OFF (S311).For example, can be with the second igniting input voltage V Ig2 intervals with 5ms (millisecond) are input in the microcomputer 10.When above-mentioned input is continuous when having identical result 8 times, input value is filtered in second igniting be fixed on ON or OFF.
Microcomputer 10 determines that it is ON or OFF (S313) that input values are filtered in second igniting, and determines that according to this result (OFF or ON) controls to engine differently that (S314 S315), wherein adds the second ignition relay load that changes on engine.
Therefore, when the level at battery supply voltage+B be can't be under the low state with the second suitable igniting input voltage V Ig2 when being input in the microcomputer 10, can replace the input value that input value obtain to be similar to the value under the normal battery power state by supposition.Suppose the replacement input value based on the information relevant (that is, exporting the internal control information of igniting relay control signal) about which side (ON or OFF) of ECU 1 (holding circuit 11) forward second ignition relay 22 with the ignition relay control signal of ECU 1.
(respectively in (1) annex relay 20, (2) first ignition relay 21 and (3) second ignition relay 22) have been described in the present embodiment: in being fed back to the sub-10a of annex relay voltage input end respectively, among the sub-10d of the first ignition relay voltage input end and the input voltage VA among the sub-10e of the second ignition relay voltage input end, the first igniting input voltage V Ig1 and the second igniting input voltage V Ig2 voltage level is that low (that is, less than assigned voltage: in the time of 5.3V), ON/OFF relay 2, that be confirmed as turn-offing determines.Alternatively, when above-mentioned three voltages when being high, obviously can adopt ON/OFF similar, that be confirmed as connecting to determine to relay.
In the present embodiment, microcomputer 10 determines whether battery supply voltage+B is low.Even the level of power-supply battery voltage+B is low, also can handle the replacement input value that obtains to represent exactly the vehicle virtual condition by replacing input.Therefore, can suppress the mistake of the input value of input voltage is determined and incorrect input, thus to the user provide with realize their expectation, to the control of relay.
(the 3rd embodiment)
As shown in Figure 8, the door lock control device among the 3rd embodiment mainly comprises: ECU 1, door lock motor M1 to M5 and latch position switch SW 1 are to SW5.Door lock motor M1 to M5 is connected to ECU 1.Latch position switch SW 1 to SW5 detects the latched position of the door lock that activates by means of door lock motor M1 to M5.
ECU 1 comprises microcomputer 10, transistor T r1, T r2, relay switch R y1, R y2, input resistor R11 to R15 and pullup resistor R21 to R25.
Microcomputer 10 execute exceptions are determined and are replaced input, below will be described this.
Microcomputer 10 is via transistor T r1 and relay R y1 is connected to the sub-ACT+ in control output end of ECU 1.Microcomputer 10 is also via transistor T r2 and relay R y2 are connected to the sub-ACT-in control output end of ECU 1.In addition, microcomputer 10 is connected to latch position signal input terminal LSW 1 to LSW 5 via input resistor R11 to R15 respectively.Battery supply voltage+B is applied to latch position signal input terminal LSW 1 to LSW 5 via pullup resistor R21 to R25 respectively.
Door lock motor M1 to M5 is connected between sub-ACT+ in control output end and the sub-ACT-in control output end concurrently.Door lock motor M1 and M5 are used to locking respectively or open the car door lock mechanical hook-up (not shown) of the correspondence of driver's seat car door, passenger seat car door, right back car door, left back car door and back bunker car door (boot door).
Latch position switch SW 1 to SW5 and the corresponding door lock assembly device interlocking that drives by door lock motor M1 to M5 respectively.The fixed terminal of latch position switch SW 1 to SW5 is connected respectively to the latch position signal input terminal of ECU 1, i.e. LSW1 to LSW5.Other switch terminal ground connection of latch position switch SW 1 to SW5.
Below, be described with reference to Fig. 8 to 10 pair of operation according to the replacement input control method of the 3rd embodiment with above-mentioned configuration.In the present embodiment, as one of input of the replacement under the abnormality of feedback system, for example the replacement input of the supposition input value of expression latch position state will be paid attention between the circuit age at failure.
When ECU 1 outputs to door lock motor M1 to M5 (S401 among Fig. 9) with the door lock control signal, activate door lock motor M1 to M5, thereby by the door lock assembly device with door locked.
More particularly, as shown in Figure 8, microcomputer 10 is connected transistor T r1.So, make relay R y1 switches on, and then battery supply voltage+B is applied to the sub-ACT+ in control output end.Therebetween, transistor T r2 keep turn-offing, and therefore the sub-ACT-in control output end are remained on ground voltage level.As a result, sub-ACT+ flows to the sub-ACT-in control output end to electric current from the control output end.Thereby door lock motor M1 to M5 is switched on, thus by driving the door lock assembly device with door locked.Each latch position switch SW 1 to SW5 has switch terminal and fixed terminal, connects this two terminals when connecting corresponding latch position switch (SW1-SW5).Switch terminal ground connection.The fixed terminal of latch position switch SW 1 to SW5 is connected respectively to latch position signal input terminal LSW1 to LSW5.
When its fixed terminal was connected to corresponding switch terminal, each latch position switch SW 1 to SW5 was switched on.After this, will be input to (S402) the microcomputer 10 by corresponding latch position signal input terminal (LSW1-LSW5) and corresponding input resistance (R11-R15) from the latch position signal (ground voltage level) that each latch position switch SW 1 to SW5 produces.
Under the normal condition that does not have open circuit fault etc., each latch position signal input terminal LSW1 to LSW5 is in ground voltage level.Therefore, after the latch position switch (SW1-SW5) from correspondence fed back to the corresponding latch position signal that is in ground voltage level, microcomputer 10 was determined door locked (S403: be).Then, the ground voltage level of latch position signal is used as input value and is input to (S404) in the microcomputer 10.
Occur in feedback system under the abnormality of (representing with X in Fig. 8) such as open circuit faults, the latch position signal can not normally be input in the microcomputer 10.Therefore, ECU 1 supposes current latch position based on door lock output control information, and wherein door lock output control information is the internal control information that is stored among arbitrary ECU.After this, the supposition input value (controlling value) of the latch position that expression is supposed alternatively is input in the microcomputer 10 of ECU 1.
More particularly, in feedback system as shown in Figure 8, occur under the abnormality of open circuit fault etc., even connecting latch position switch SW 1 to SW5 (in Fig. 8, be latch position switch SW 2) (promptly afterwards, each fixed terminal that is connected to corresponding latch position signal input terminal (LSW1-LSW5) is connected to the switch terminal of corresponding ground connection), latch position signal input terminal LSW1 to LSW5 (among Fig. 8, being latch position signal input terminal LSW2) is not in ground voltage level yet.Latch position signal input terminal LSW1 to LSW5 remains on the level of battery supply voltage+B.Therefore, microcomputer 10 judges that (S403 :) latch position signal input terminal LSW1 to LSW5 (latch position signal input part LSW2) is not in this blocked ground voltage level of indication.Based on door lock output control information-it is the internal control information that is stored among arbitrary ECU, microcomputer 10 supposition latch position after out gate lock control signal should become " locking ".Subsequently, the supposition input value of the latch position of expression supposition is input to (S405) in the microcomputer 10 with being replaced.
When ECU 1 opens control signal when outputing to door lock motor M1 to M5 (S501 among Figure 10) with door lock, activate door lock motor M1 to M5, open door lock by the door lock assembly device thus.
More particularly, as shown in Figure 8, microcomputer 10 is connected transistor T r2.So, make relay R y2 switch on, and then battery supply voltage+B is applied to the sub-ACT-in control output end.Therebetween, transistor T r1 keeps turn-offing, and therefore the sub-ACT+ in control output end is remained on ground voltage level.As a result, sub-ACT-flows to the sub-ACT+ in control output end to electric current from the control output end.Thereby oppositely make door lock motor M1 to the M5 energising, open door lock by driving the door lock assembly device thus.Next, latch position switch SW 1 to SW5 is turned off (open circuit) (that is, each being connected to the switch terminal disconnection of the fixed terminal of corresponding latch position signal input terminal (LSW1-LSW5) from the ground connection of correspondence).
When latch position switch SW 1 to SW5 is turned off, will be input to (S502) the microcomputer 10 by the latch position signal input terminal LSW1-LSW5 of correspondence and the input resistor R11-R15 of correspondence from the corresponding latch position signal (being in the level of battery supply voltage+B) that corresponding latch position switch SW 1 to SW5 produces.
Under the abnormality that for example latch position switch SW 1 to SW5 keeps connecting, the mistake (indicating with X among Fig. 8) such as short circuit takes place in feedback system.As a result, the latch position signal can not normally be input in the microcomputer 10.Therefore, ECU 1 opens the output control information based on door lock and supposes current latch position, and wherein door lock unlatching output control information is the internal control information that is stored among arbitrary ECU.After this, the supposition input value (controlling value) of the latch position that indication is supposed alternatively is input in the microcomputer 10 of ECU 1.
For this reason, microcomputer 10 determines whether latch position signal input terminal LSW1 to LSW5 (in the example that Fig. 8 considered, being latch position signal input terminal LSW2) are in the level (S503 among Figure 10) of battery supply voltage+B that the indication door lock is unlocked.If normal (that is, latch position signal input terminal LSW2 is in the level of battery supply voltage+B) then is input to (S504) in the microcomputer 10 with latch position switching signal (being in the level of power-supply battery voltage+B) as input value.If unusual, microcomputer 10 supposes that based on door lock unlatching output control information latch position should become " unblanking " after the output door lock is opened control signal, and wherein door lock unlatching output control information is the internal control information that is stored among arbitrary ECU.Subsequently, the supposition input value of the door lock open site that expression is supposed alternatively is input to (S505) in the microcomputer 10.
According to present embodiment,, and will represent that the supposition input value of the latch position of door alternatively is input in the microcomputer 10 based on the internal control information that is stored among arbitrary ECU.Therefore, can obtain to represent more accurately the replacement input value of vehicle virtual condition, provide control door lock, that will realize their expectation to the user thus.
In addition, in the 3rd embodiment described above, although be that consideration will for example the door lock for vehicle mechanical hook-up be as controll plant, controll plant is not limited to the door lock for vehicle mechanical hook-up.
For a person skilled in the art, additional advantage is expected with improveing will hold to show very much.Therefore, the present invention in it is major, be not limited to illustrate with specific detail, typical equipments and the illustrative example described.
For example, in first and second embodiment, ON determines that threshold voltage (ON determines threshold voltage) can be used as OFF and determine threshold voltage (the 2nd OFF determines threshold voltage), and OFF determines that threshold voltage (OFF determines threshold voltage) can be used as ON and determine threshold voltage (the 2nd ON determines threshold voltage).That is to say, when input voltage is higher than the 2nd OFF respectively and determines threshold voltage and be lower than the 2nd ON to determine threshold voltage, input value can be arranged to OFF value and ON value, be turned off and be switched on the indication controll plant.

Claims (10)

1, a kind of replacement input control method comprises:
Export a control signal of controll plant (2,20,21,22) being carried out break-make control from electronic control unit (1) to controll plant (2,20,21,22);
Based on the input voltage (VA, the V that feed back to from controll plant (2,20,21,22) the electronic control unit (1) Ig1, V Ig2), determine whether controll plant (2,20,21,22) is switched on; And
Definite (S1, S101, S201, S301) battery supply voltage (+B) whether be lower than assigned voltage, wherein:
If battery supply voltage (+B) be not less than this assigned voltage, then this replacement input control method comprises one of following operation (S4, S104, S204, S304, S5, S105, S205, S305):
An input value is set: (1) is as input voltage (VA, V Ig1, V IgWhen 2) being equal to or higher than an ON and determining threshold voltage, it is arranged to the ON value of indicating controll plant (2,20,21,22) to be switched on; Perhaps (2) are as input voltage (VA, V Ig1, V IgWhen 2) being equal to or higher than the 2nd OFF and determining threshold voltage, it is arranged to the OFF value of indicating controll plant (2,20,21,22) to be turned off; And
This input value is set: (1) is as input voltage (VA, V Ig1, V Ig2) be equal to or less than an OFF when determining threshold voltage, it is arranged to the OFF value of indicating controll plant (2,20,21,22) to be turned off, a described OFF determines that threshold voltage is lower than an ON and determines threshold voltage; Perhaps (2) are as this input voltage (VA, V Ig1, V Ig2) be equal to or less than the 2nd ON when determining threshold voltage, it is arranged to the ON value of indicating controll plant (2,20,21,22) to be switched on, described the 2nd ON determines that threshold voltage is lower than the 2nd OFF and determines threshold voltage; And
If battery supply voltage (+B) being lower than this assigned voltage, this replacement input control method comprises one of following operation (S8, S108, S208, S308, S9, S109, S209, S309):
If this control signal of electronic control unit (1) positive output is connected this controll plant (2,20,21,22), then input value is arranged to the ON value of indicating controll plant (2,20,21,22) to be switched on based on control signal information; And
If this control signal of electronic control unit (1) positive output is turn-offed this controll plant (2,20,21,22), then this input value is arranged to the OFF value of indicating controll plant (2,20,21,22) to be turned off based on this control signal information.
2, according to the replacement input control method of claim 1, wherein controll plant (2,20,21,22) comprises one of the following at least:
Control is to the annex relay (20) of annex power supply; And
Control is to the ignition relay (21,22) of portfire power supply.
3, according to the replacement input control method of claim 1, wherein control signal information is that the feedback system of described controll plant (2,20,21,22) falls into the information that is stored in described electronic control unit (1) before the abnormality.
4, according to the replacement input control method of claim 1, wherein control signal information is the input value of supposition, and it is that internal control information from be stored in described electronic control unit (1) obtains.
5,, also comprise input value is filtered (S10, S110, S210, S310) according to the replacement input control method of claim 1.
6, a kind of replacement input control device comprises:
Electronic control unit (1), it exports a control signal that controll plant (2,20,21,22) is carried out break-make control to controll plant (2,20,21,22), and based on input voltage (VA, V from controll plant (2,20,21,22) feedback Ig1, V Ig2) determine that controll plant (2,20,21,22) is switched on or is turned off, wherein electronic control unit (1) comprising:
Battery supply voltage is determined element (S1, S101, S201, S301), its determine battery supply voltage (+B) whether be lower than assigned voltage;
Normal input value setting element, if battery supply voltage (+B) be not less than this assigned voltage, then it carries out one of following operation (S4, S104, S204, S304, S5, S105, S205, S305):
An input value is set: (1) is as input voltage (VA, V Ig1, V IgWhen 2) being equal to or higher than an ON and determining threshold voltage, it is arranged to the ON value of indicating controll plant (2,20,21,22) to be switched on; Perhaps (2) are as input voltage (VA, V Ig1, V IgWhen 2) being equal to or higher than the 2nd OFF and determining threshold voltage, it is arranged to the OFF value of indicating controll plant (2,20,21,22) to be turned off; And
This input value is set: (1) is equal to or less than an OFF when determining threshold voltage when input voltage (VA, Vig1, Vig2), it is arranged to the OFF value of indicating controll plant (2,20,21,22) to be turned off, and a described OFF determines that threshold voltage is lower than an ON and determines threshold voltage; Perhaps (2) are equal to or less than the 2nd ON when determining threshold voltage when input voltage (VA, Vig1, Vig2), it is arranged to the ON value of indicating controll plant (2,20,21,22) to be switched on, and described the 2nd ON determines that threshold voltage is lower than the 2nd OFF and determines threshold voltage; And
Replace the input value setting element, if battery supply voltage (+B) be lower than this assigned voltage, then it carries out one of following operation (S8, S108, S208, S308, S9, S109, S209, S309):
If this control signal of electronic control unit (1) positive output is connected this controll plant (2,20,21,22), then this input value is arranged to the ON value of indicating controll plant (2,20,21,22) to be switched on based on control signal information; And
If this control signal of electronic control unit (1) positive output is turn-offed this controll plant (2,20,21,22), then this input value is arranged to the OFF value of indicating controll plant (2,20,21,22) to be turned off based on control signal information.
7, according to the replacement input control device of claim 6, wherein controll plant (2,20,21,22) comprises one of the following at least:
Control is to the annex relay (20) of annex power supply; And
Control is to the ignition relay (21,22) of portfire power supply.
8, according to the replacement input control device of claim 6, wherein control signal information is that the feedback system of described controll plant (2,20,21,22) falls into the information that is stored in described electronic control unit (1) before the abnormality.
9, according to the replacement input control device of claim 6, wherein control signal information is the input value of a supposition, and it is that internal control information from be stored in electronic control unit (1) obtains.
10, according to the replacement input control device of claim 6, also comprise filtrator (S10, S110, S210, S310), by it input value is filtered.
CNB2006101513946A 2005-07-15 2006-07-14 Alternative input control method and device Expired - Fee Related CN100487609C (en)

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