CN109910807A - A kind of collision detection circuit - Google Patents
A kind of collision detection circuit Download PDFInfo
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- CN109910807A CN109910807A CN201910129849.1A CN201910129849A CN109910807A CN 109910807 A CN109910807 A CN 109910807A CN 201910129849 A CN201910129849 A CN 201910129849A CN 109910807 A CN109910807 A CN 109910807A
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Abstract
The invention discloses a kind of collision detection circuits, comprising: signal deteching circuit and trigger circuit；The input terminal of signal deteching circuit connects safety control module, the input terminal of the output end connection trigger circuit of signal deteching circuit, the output end linking objective circuit of trigger circuit；Target loop is high tension loop and/or the oil circuit of vehicle interior；Safety control module when the collision alarm for detecting in vehicle sensors meets default impact conditions, sends air bag igniting signal to each air bag；Signal deteching circuit sends collision trigger signal to trigger circuit for detecting the signal of safety control module sending, and when detecting air bag igniting signal；Trigger circuit sends collision alarm to target loop for when receiving collision trigger signal, to cut off target loop, without controller to whether colliding and detecting, improves the reliability and response speed of detection.
Description
Technical field
This application involves automobile technical field more particularly to a kind of collision detection circuits.
Background technique
In order to guarantee safety, when colliding, the safety control module of vehicle, as air bag module (ACU or
RCM), electronic control module (ECU) etc. needs to send by devices such as the built-in acceleration transducer of vehicle and perimeter sensors
Signal, calculate and judge collision occur severe degree, be in due course to each air bag issue electrical fire signal
(squid), and simultaneously frequency is sent to other control modules (such as battery management system BMS, oil circuit feedway) of vehicle
Or pulse width modulation (Pulse Width Modulation, PWM) signal of specific change occurs for duty ratio, cuts off in vehicle
The supply of portion's high tension loop and oil circuit.
Since when colliding generation, other control modules (such as battery management system BMS, oil circuit feedway) need elder generation
The pwm signal received is detected, judges whether to collide, then cuts off vehicle interior high tension loop and the confession of oil circuit
It gives, reliability is not high and there is control delay.
Summary of the invention
In view of this, the embodiment of the present application provides a kind of collision detection circuit, it is able to solve collision inspection in the prior art
Survey the problem that reliability is not high, delay is long.
A kind of collision detection circuit provided by the embodiments of the present application, comprising: signal deteching circuit and trigger circuit；
The input terminal of the signal deteching circuit connects safety control module, the output end connection of the signal deteching circuit
The input terminal of the trigger circuit, the output end linking objective circuit of the trigger circuit；The target loop is vehicle interior
High tension loop and/or oil circuit；The safety control module, the collision alarm for detecting in vehicle sensors meet default
When impact conditions, air bag igniting signal is sent to each air bag；
The signal deteching circuit, the signal issued for detecting the safety control module, and work as and detect the peace
When full air bag ignition signal, collision trigger signal is sent to the trigger circuit；
The trigger circuit sends collision alarm to target loop for when receiving the collision trigger signal, with
Cut off the target loop.
Optionally, the signal deteching circuit, comprising: current value detection circuit and electric current pulse width detection circuit；
The input terminal of the current value detection circuit connects the safety control module, the current value detection circuit it is defeated
Outlet connects the input terminal of the electric current pulse width detection circuit；The output end of the electric current pulse width detection circuit connects the triggering
The input terminal of circuit；
The current value detection circuit, it is pre- whether the current value for detecting the safety control module sending signal is greater than
If current threshold；When the current value that the safety control module issues signal is greater than the predetermined current threshold, pulsewidth is sent
Trigger signal is to the electric current pulse width detection circuit；
The electric current pulse width detection circuit, for when receiving the pulsewidth trigger signal, detecting the pulsewidth triggering
Whether the duration of signal is greater than preset time threshold；When the duration of the pulsewidth trigger signal be greater than it is described default when
Between threshold value when, confirmly detect the air bag igniting signal, send the collision trigger signal to the trigger circuit.
Optionally, the current value detection circuit, comprising: current detecting interface circuit, current surveillance module and communication connect
Mouth circuit；
The current detecting interface circuit be connected to the safety control module signal input part and signal output end it
Between, the current detecting interface circuit includes concatenated first resistor network and second resistance network, the first resistor network
Total resistance value be less than total resistance value of the second resistance network, and the total resistance value and the second resistance of the first resistor network
The sum of total resistance value of network is equal to the resistance value of the fuse of the air bag；
The positive input terminal and negative input end of the current surveillance module are connected to the both ends of the first resistor network,
The control terminal of the current surveillance module connects the communication interface circuit, described in the output end connection of the current surveillance module
The input terminal of electric current pulse width detection circuit；The communication interface circuit, for being configured to the predetermined current threshold；
The current surveillance module, for being greater than the predetermined current in the electric current for flowing through the current detecting interface circuit
When threshold value, the low level pulsewidth trigger signal is exported to the electric current pulse width detection circuit.
Optionally, the electric current pulse width detection circuit, comprising: asynchronous counter；
The resetting pin of the asynchronous counter connects the output end of the current surveillance module, the asynchronous counter
N-th output pin connects the input terminal of the trigger circuit；N chooses according to the preset time threshold.
Optionally, the trigger circuit, comprising: data-latching circuit and logic control circuit；
The input terminal of the data-latching circuit connects the output end of the signal deteching circuit, the data-latching circuit
Output end connect the input terminal of the logic control circuit；The output end of the logic control circuit connects the target and returns
Road；
The data-latching circuit obtains level for locking the level state of the collision trigger signal received
Locking signal is exported to the logic control circuit；
The logic control circuit, for cutting off the target loop when receiving the level catch signal.
Optionally, the data-latching circuit, comprising: or door；
Described or door first input end connects the output end of the signal deteching circuit, described or door the second input terminal
Described in connection or the output end of door, described or door output end are also connected with the input terminal of the logic control circuit.
Optionally, described or door the output end is also connected with controller, so that the controller issues collision prompt.
Optionally, the logic control circuit, comprising: NOT gate and with door；
The input terminal of the NOT gate connects the output end of the data-latching circuit, described in the output end connection of the NOT gate
With the first input end of door；
Described connect with the second input terminal of door cuts off enable signal, described that the target time is connect with the output end of door
Road；Can the cutting enable signal be cut off for controlling the target loop.
Optionally, the trigger circuit, further includes: release circuit；
The release circuit, for initializing the data-latching circuit and the logic control circuit.
Optionally, the release circuit, comprising: PMOS tube and NMOS tube；
The drain electrode of the PMOS tube connects the power supply of the feeder ear and the logic control circuit of the data-latching circuit
The source electrode at end, the PMOS tube connects power supply；
The grid of the PMOS tube connects the drain electrode of the NMOS tube through resistance, and connects the power supply through resistance；
The source electrode of the NMOS tube is grounded, the grid resistance grounded of the NMOS tube and connection release signal.
Compared with prior art, the application has at least the following advantages:
In the embodiment of the present application, signal deteching circuit directly detects the air bag igniting letter of safety control module sending
Number, to realize the detection that collision occurs, without controller to whether colliding and detecting, improve the reliability of detection
And response speed.When detecting air bag igniting signal, signal deteching circuit transmission collision trigger signal to trigger circuit,
By trigger circuit directly interior according to the collision trigger signal cutting high tension loop and/or oil circuit, the safety of vehicle ensure that.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
The some embodiments recorded in application, for those of ordinary skill in the art, without creative efforts,
It can also be obtained according to these attached drawings other attached drawings.
Fig. 1 is a kind of structural schematic diagram of collision detection circuit provided by the embodiments of the present application；
Fig. 2 is a kind of current versus time curve figure of air bag igniting signal；
Fig. 3 is the structural schematic diagram of another collision detection circuit provided by the embodiments of the present application；
Fig. 4 is the structural schematic diagram of current value detection circuit in a kind of collision detection circuit provided by the embodiments of the present application；
Fig. 5 is the structural schematic diagram of electric current pulse width detection circuit in a kind of collision detection circuit provided by the embodiments of the present application
Fig. 6 is the oscillating curve of asynchronous counter in a kind of collision detection circuit provided by the embodiments of the present application；
Fig. 7 is the structural schematic diagram of trigger circuit in a kind of collision detection circuit provided by the embodiments of the present application；
Fig. 8 is the circuit topology of trigger circuit in a kind of collision detection circuit provided by the embodiments of the present application；
Fig. 9 is the structural schematic diagram of trigger circuit in another collision detection circuit provided by the embodiments of the present application；
Figure 10 is the circuit topology of trigger circuit in another collision detection circuit provided by the embodiments of the present application.
Specific embodiment
In order to make those skilled in the art more fully understand application scheme, below in conjunction in the embodiment of the present application
Attached drawing, the technical scheme in the embodiment of the application is clearly and completely described, it is clear that described embodiment is only this
Apply for a part of the embodiment, instead of all the embodiments.Based on the embodiment in the application, those of ordinary skill in the art exist
Every other embodiment obtained under the premise of creative work is not made, shall fall in the protection scope of this application.
It should be appreciated that in this application, " at least one (item) " refers to one or more, and " multiple " refer to two or two
More than a."and/or" indicates may exist three kinds of relationships, for example, " A and/or B " for describing the incidence relation of affiliated partner
It can indicate: only exist A, only exist B and exist simultaneously tri- kinds of situations of A and B, wherein A, B can be odd number or plural number.Word
Symbol "/" typicallys represent the relationship that forward-backward correlation object is a kind of "or"." at least one of following (a) " or its similar expression, refers to
Any combination in these, any combination including individual event (a) or complex item (a).At least one of for example, in a, b or c
(a) can indicate: a, b, c, " a and b ", " a and c ", " b and c ", or " a and b and c ", and wherein a, b, c can be individually, can also
To be multiple.
Present inventor has found under study for action, currently, safety control module is issuing electronics point to each air bag
When fiery signal, the frequency of the pwm signal sent to other control modules of vehicle is usually between 10Hz-250Hz, and the period is
100 milliseconds to 4 milliseconds.In order to avoid circuit error, stabilization processing is so that other control modules of vehicle usually require at least two
The pwm signal in a period could effectively judge the generation of collision, interior high tension loop and oil circuit supply be cut off, in addition soft
Part is influenced by resource, and control may also will appear delay, leads to the problem that collision detection reliability is not high, delay is long.
For this purpose, the embodiment of the present application provides a kind of collision detection circuit, sent by directly detecting safety control module
Electrical fire signal out carries out software judgement without control module to realize the detection that collision occurs, in collision detection electricity
Road detects the direct cutoff high circuit of electrical fire signal and oil circuit supply, may be implemented to stablize, quickly respond, guarantees vehicle
Safety.
Based on above-mentioned thought, in order to make the above objects, features, and advantages of the present application more apparent, below with reference to
Attached drawing is described in detail the specific embodiment of the application.
Referring to Fig. 1, which is a kind of structural schematic diagram of collision detection circuit provided by the embodiments of the present application.
Collision detection circuit provided by the embodiments of the present application, comprising: signal deteching circuit 100 and trigger circuit 200；
The input terminal of signal deteching circuit 100 connects safety control module ACU, and the output end of signal deteching circuit 100 connects
Contact the input terminal of Power Generation Road 200, the output end linking objective circuit 300 of trigger circuit 200.
In the embodiment of the present application, target loop 300 can be high tension loop and/or the oil circuit of vehicle interior.Safety control
Molding block ACU sends air bag igniting when the collision alarm for detecting in vehicle sensors meets default impact conditions
Signal is to each air bag.
Signal deteching circuit 100 for detecting the signal of safety control module ACU sending, and works as and detects air bag
When ignition signal, collision trigger signal is sent to trigger circuit 200；
Trigger circuit 200, for when receiving collision trigger signal, sending collision alarm to target loop 300, to cut
Disconnected target loop 300.
In the embodiment of the present application, signal deteching circuit 100 can directly to safety control module ACU issue signal into
Row detection, when detecting air bag igniting signal, illustrates that vehicle collides, and needs to disconnect interior high tension loop and oil
Road is for giving to guarantee vehicle safety.Since signal deteching circuit 100 directly detects air bag igniting signal, without soft
Part judges whether to judge, the reliability of detection is higher, corresponding speed faster, can transmission collision triggering letter promptly and accurately
Number to trigger circuit 200, so as to trigger circuit 200 collide occur when, quickly cut off target loop.
In practical applications, in order to guarantee that air bag is normally opened, the air bag point of safety control module ACU sending
Fiery signal usually requires certain current value and maintains certain pulse width.A kind of illustrated air bag igniting of Fig. 2
The current versus time curve figure of signal.As can be known from Fig. 2, the current value of the air bag igniting signal is maintained when exceeding 1.75A
0.5 millisecond, to guarantee that air bag is opened.
Therefore, in order to realize the normal detection to air bag igniting signal, in some possible realities of the embodiment of the present application
In existing mode, as shown in figure 3, signal deteching circuit 100, may include: current value detection circuit 101 and electric current pulse width detection electricity
Road 102；
The input terminal of current value detection circuit 101 connects safety control module ACU, the output of current value detection circuit 101
The input terminal of end connection electric current pulse width detection circuit 102；The output end of electric current pulse width detection circuit 102 connects trigger circuit 200
Input terminal；
Current value detection circuit 101, it is default whether the current value for detecting safety control module ACU sending signal is greater than
Current threshold；When the current value that safety control module ACU issues signal is greater than predetermined current threshold, pulsewidth trigger signal is sent
To electric current pulse width detection circuit 102；
Electric current pulse width detection circuit 102, for when receiving pulsewidth trigger signal, detection pulsewidth trigger signal to continue
Whether the time is greater than preset time threshold；When the duration of pulsewidth trigger signal being greater than preset time threshold, detection is determined
To air bag igniting signal, collision trigger signal is sent to trigger circuit 200.
In the embodiment of the present application, current detection circuit 101 is greater than in the current value that safety control module ACU issues signal
When predetermined current threshold, the pulsewidth trigger signal of particular level is persistently sent to electric current pulse width detection circuit 102.For example, when peace
When the current value that full control module ACU issues signal is less than or equal to predetermined current threshold, current detection circuit 101 sends high electricity
Ordinary mail number is to electric current pulse width detection circuit 102；Once the current value that safety control module ACU issues signal is greater than predetermined current threshold
Value, dragging down the signal is low level, i.e., persistently sends low level pulsewidth trigger signal to electric current pulse width detection circuit 102.It is real
In the application of border, it can need to set pulsewidth trigger signal according to specific design, can be high level signal and be also possible to
Low level signal, here without limiting.
Electric current pulse width detection circuit 102, can holding time by particular level when receiving pulsewidth trigger signal
Judge whether the duration of pulsewidth trigger signal is greater than preset time threshold.Once the duration of pulsewidth trigger signal is greater than
Preset time threshold then illustrates that current value that current value detection circuit 101 detects is greater than holding for the signal of predetermined current threshold
The continuous time is more than preset time threshold, meets the feature of air bag igniting signal, confirmly detects air bag igniting signal,
It sends collision trigger signal and guarantees vehicle safety so that trigger circuit 200 cuts off target loop to trigger circuit 200.
In practical applications, preset time threshold and predetermined current threshold can be according to the specific of air bag igniting signal
Form is set, accurately to detect air bag igniting signal.By taking air bag igniting signal shown in Fig. 2 as an example, in advance
If current threshold can be 1.75A, preset time threshold can be less than 0.5 millisecond and close to 0.5 millisecond of value (such as 0.488
Millisecond).
In the embodiment of the present application, signal deteching circuit directly detects the air bag igniting letter of safety control module sending
Number, to realize the detection that collision occurs, without controller to whether colliding and detecting, improve the reliability of detection
And response speed.When detecting air bag igniting signal, signal deteching circuit transmission collision trigger signal to trigger circuit,
By trigger circuit directly interior according to the collision trigger signal cutting high tension loop and/or oil circuit, the safety of vehicle ensure that.
The specific implementation one by one to current value detection circuit 101 and electric current pulse width detection circuit 102 is carried out below
It illustrates.
Referring to fig. 4, which is the knot of current value detection circuit in a kind of collision detection circuit provided by the embodiments of the present application
Structure schematic diagram.
In some possible implementations of the embodiment of the present application, current value detection circuit 101 be can specifically include: electricity
Stream detection interface circuit 41, current surveillance module 42 and communication interface circuit 43；
Current detecting interface circuit 41 is connected between the signal input part and signal output end of safety control module ACU；
Wherein, current detecting interface circuit 41 includes concatenated first resistor network 41a and second resistance network 42b；The
The sum of total resistance value and total resistance value of second resistance network 42b of one resistor network 41a are equal to the resistance value of the fuse of air bag,
It can guarantee that safety control module ACU is exported to the signal of current value detection circuit 101 to export with it to the signal of air bag
Unanimously, guarantee the accuracy to air bag igniting signal detection.
The positive input terminal and negative input end of current surveillance module 42 are connected to the both ends of first resistor network 41a, electricity
The control terminal connection communication interface circuit 43 of monitoring module 42 is flowed, the output end of current surveillance module 42 connects electric current pulse width detection
The input terminal of circuit 102；Communication interface circuit 43, for being configured to predetermined current threshold；
Current surveillance module 42, it is defeated when the electric current for flowing through current detecting interface circuit 41 is greater than predetermined current threshold
Low level pulsewidth trigger signal is to electric current pulse width detection circuit 102 out.
It should be noted that being limited to the detection range of current surveillance module 42, need to current detecting interface circuit 41
The voltage at the middle lesser resistance both ends of resistance measures, and exports from measurement safety control module ACU to current value detection circuit
The current value of 101 signal.Therefore, total resistance value of first resistor network 41a is less than total resistance value of second resistance network 42b.?
In one example, the sum of total resistance value of total resistance value of first resistor network 41a and second resistance network 42b is equal to 2 ohm, and first
Total resistance value of resistor network 41a is 0.03 ohm, when it is implemented, can according to the actual situation to first resistor network 41a and
The specific structure of second resistance network 42b and including the resistance value of resistance set, the embodiment of the present application to this not into
Row limits, and also will not enumerate.
In the embodiment of the present application, voltage difference of the current surveillance module 42 at the both ends first resistor network 41a is greater than default
When current threshold, it can continue to send low level pulsewidth trigger signal to electric current pulse width detection circuit 102.In one example,
Current surveillance module 42 can be the current monitor of any one model, such as bidirectional current/power prison of model INA226
Visual organ mixes the voltage output of model INA270, unidirectional measurement current parallel monitor.
It, can be with it should be noted that when the electric current that current monitor (such as INA270) will test is converted into voltage output
The voltage value that it is exported is compared with reference voltage using voltage comparator, so that it is determined that the electric current of current monitor detection
Whether value is greater than predetermined current threshold.
In the specific implementation, collision detection circuit can also be realized by the electric current set-up function of communication interface circuit 43
Self-test, such as lesser current threshold can be set by communication interface circuit 43 in each power up cycle, improve system
Reliability.Furthermore it is also possible to obtain the current conditions when collision does not occur, the connection of collision detection circuit is carried out
Determine.
Referring to Fig. 5, which is electric current pulse width detection circuit in a kind of collision detection circuit provided by the embodiments of the present application
Structural schematic diagram.
In some possible implementations of the embodiment of the present application, electric current pulse width detection circuit 102 be can specifically include:
Asynchronous counter CT；
The output end of the resetting pin RESET connection current surveillance module 42 of asynchronous counter CT, asynchronous counter CT's
The input terminal of n-th output pin connection trigger circuit 200.
In the embodiment of the present application, when the signal of input is low level, meet the count condition of asynchronous counter CT, open
Begin to count.In practical application, the counter of the disposable type met the requirements, such as general counter 4060 can be chosen.It is different
The pulse signal Osc In that crystal crystal oscillator generates frequency accurate (such as 32.768kHz), each output can be used in step counter CT
The Induction Peried of pin is different, as shown in fig. 6, after starting counting (i.e. resetting pin RESET is low level), asynchronous counter CT
The 4th output pin Q4 start to carry out the oscillation of rule in the 8th pulse of pulse signal Osc In, the 5th output draws
The oscillation of foot Q5 rule in the 16th pulse of pulse signal Osc In, the 6th output pin Q6 is in pulse signal Osc In
The 32nd pulse when start rule oscillation, and so on.Therefore, in order to detect current surveillance module 42 output low level
Whether the pulsewidth of pulsewidth trigger signal is greater than preset time threshold, can n-th output pin to asynchronous counter CT carry out
The time of rule oscillation is detected, by the input terminal of the n-th output pin connection trigger circuit 200 of asynchronous counter CT, N
It needs to be chosen according to preset time threshold.
Continue by taking air bag igniting signal shown in Fig. 2 as an example, when the low-level pulse width that current surveillance module 42 exports
When trigger signal continues nearly 0.5 millisecond, just think to detect air bag igniting signal.It then, can be by asynchronous counter CT
The 5th output pin Q5 connection trigger circuit 200 input terminal, when the 5th output pin Q5 start carry out rule oscillation
When, asynchronous counter CT has calculated 16/32.768kHz=0.488ms, can satisfy low-level pulse width trigger signal and continues nearly
0.5 millisecond of requirement can detect air bag igniting signal so that trigger circuit 200 cuts off target loop 300.
It should be noted that in practical applications, needing to consider to the selection of the n-th output pin of asynchronous counter CT
The problem of noise jamming, N are unsuitable too small.Lead to the low of 42 output duration section of current surveillance module when interfering because of transient noise
When level pulsewidth trigger signal, although asynchronous counter CT is started counting, it is unable to maintain that the specific time, n-th output is drawn
Foot does not carry out the oscillation of rule, and after noise is eliminated, resetting pin RESET is raised, and asynchronous counter CT is reset, and avoids
The interference of noise.When resetting pin RESET is pulled low again, asynchronous counter CT restarts to count.
The specific implementation of trigger circuit in the embodiment of the present application is illustrated below.
Referring to Fig. 7, which is the structural representation of trigger circuit in a kind of collision detection circuit provided by the embodiments of the present application
Figure.
In some possible implementations of the embodiment of the present application, trigger circuit 200 be can specifically include: data latch
Circuit 201 and logic control circuit 202；
The output end of the input terminal connection signal detection circuit 100 of data-latching circuit 201, data-latching circuit 201
The input terminal of output end connection logic control circuit 202；The output end linking objective circuit 300 of logic control circuit 202；
Data-latching circuit 201 obtains level catch letter for locking the level state of the collision trigger signal received
Number output is to logic control circuit 202；
Logic control circuit 202, for cutting off target loop 300 when receiving level catch signal.
It should be noted that since the collision trigger signal that signal deteching circuit 100 exports may be pulse signal, it can be right
The logic of late-class circuit (i.e. trigger circuit 200) generates non-persistent influence, therefore, in the embodiment of the present application, using data
Latch cicuit 201 locks the level state of collision trigger signal.
In some possible implementations, as shown in figure 8, data-latching circuit 201, may include: or door OG；
Or the second input terminal connection of the output end or door OG of the first input end connection signal detection circuit 100 of door OG
Or the output end of door OG or the output end of door OG are also connected with the input terminal of logic control circuit 202.
In the embodiment of the present application, can by or the output end of door OG be grounded through pull down resistor so that its default output is
Low level.When the output of signal deteching circuit 100 is high level (output of such as asynchronous counter CT, which is drawn high, to be started to vibrate), or
The first input end of door OG is high level, according to or door logic it is found that or the output end of door OG is also high level so that
Or the second input terminal of door OG also becomes high level.In this way, no matter how the signal that signal deteching circuit 100 exports changes, number
High level can be maintained according to the output of latch cicuit 201, realizes the locking to the level state of collision trigger signal.
It in practical applications, can be according to the level state of collision trigger signal to the specific reality of data-latching circuit 201
Existing mode is specifically set, and the embodiment of the present application is not construed as limiting this, also repeats no more here.
In some possible designs or the output end of door OG is also connected with controller, so that controller issues collision prompt,
Prompt driver or control platform collide event.
In some possible implementations of the embodiment of the present application, with continued reference to Fig. 8, logic control circuit 202 be can wrap
Include: NOT gate NG and with door AG；
The output end of the input terminal connection data-latching circuit 201 of NOT gate NG, the output end connection of NOT gate NG is with door AG's
First input end；
Cutting enable signal relaycontrol, the output end linking objective with door AG are connect with the second input terminal of door AG
Circuit 300；Enable signal relaycontrol is cut off, can be cut off for controlling target loop 300.
In the embodiment of the present application, when detecting air bag igniting signal, NOT gate NG is defeated by data-latching circuit 201
High level signal out is converted to low level signal, and the cutting enable signal relaycontrol with vehicle interior is together as right
The control that target loop 300 is cut off.It should be noted that cutting enable signal relaycontrol can be target loop 300
The control signal of middle relay power is also possible to the enabled control signal of relay-operated controller, cuts off enable signal
Relaycontrol can be to be provided by vehicle interior controller (such as MCU).As cutting enable signal relaycontrol and non-
When the output of door NG is high level, target loop 300 is connected；When cutting enable signal relaycontrol and NOT gate NG it is defeated
When any one in out is low level, target loop 300 is cut off.When the output of data-latching circuit 201 is high level, target
Unconditionally lower electricity, cutting target loop 300 guarantee vehicle safety to relay in circuit 300.The embodiment of the present application is to target loop
300 cutting logic is also possible to cutting when high level, which is not described herein again without limiting.
In some possible implementations of the embodiment of the present application, as shown in figure 9, trigger circuit 200, can also include:
Release circuit 203；
Release circuit 203 is used for initialization data latch cicuit 201 and logic control circuit 202.
It should be noted that since the output of the data-latching circuit 201 when colliding generation can be always held at high level,
Output/state of a control will be unable to voluntarily change.Therefore, for subsequent normal use, in some possible realization sides of the application
In formula, release signal lockrelease can be exported by other controllers (such as MCU) of vehicle interior, allow data-latching circuit
201 and 202 power down of logic control circuit, realize Initialize installation.
In some possible designs, as shown in Figure 10, release circuit 203 may include: PMOS tube PM and NMOS tube
NM；
The feeder ear of the drain electrode connection data-latching circuit 201 of PMOS tube PM and the feeder ear of logic control circuit 202,
The source electrode of PMOS tube PM connects power supply V；Drain electrode of the grid of PMOS tube PM through resistance connection NMOS tube NM, and connect through resistance
Meet power supply V；
The source electrode of NMOS tube NM is grounded；The grid resistance grounded of NMOS tube NM and connection release signal lockrelease.
When release signal lockrelease is high level, NMOS tube NM conducting, PMOS tube PM is connected, and power supply V is
Data-latching circuit 201 and logic control circuit 202 are powered；When release signal lockrelease is low level, NMOS tube NM
Cut-off, the grid voltage of PMOS tube PM are V, PMOS tube PM cut-off, 202 power down of data-latching circuit 201 and logic control circuit
Initialization.
In practical application, PMOS tube PM and NMOS tube NM can be the PNP+NPN digital composite transistor of model UMD3,
It is also possible to two independent transistors, here without limiting.
It should be noted that each embodiment in this specification is described in a progressive manner, each embodiment emphasis is said
Bright is the difference from other embodiments, and the same or similar parts in each embodiment may refer to each other.For reality
For applying system or device disclosed in example, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, it is related
Place is referring to method part illustration.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above is only the preferred embodiment of the application, not makes any form of restriction to the application.Though
Right the application has been disclosed in a preferred embodiment above, however is not limited to the application.It is any to be familiar with those skilled in the art
Member, in the case where not departing from technical scheme ambit, all using the methods and technical content of the disclosure above to the application
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical scheme, any simple modification made to the above embodiment of the technical spirit of foundation the application are equal
Variation and modification, still fall within technical scheme protection in the range of.
Claims (10)
1. a kind of collision detection circuit characterized by comprising signal deteching circuit and trigger circuit；
The input terminal of the signal deteching circuit connects safety control module, described in the output end connection of the signal deteching circuit
The input terminal of trigger circuit, the output end linking objective circuit of the trigger circuit；The target loop is the height of vehicle interior
Push back road and/or oil circuit；The safety control module, the collision alarm for detecting in vehicle sensors meet default collision
When condition, air bag igniting signal is sent to each air bag；
The signal deteching circuit, the signal issued for detecting the safety control module, and work as and detect the substitute
When capsule ignition signal, collision trigger signal is sent to the trigger circuit；
The trigger circuit, for when receiving the collision trigger signal, sending collision alarm to target loop, with cutting
The target loop.
2. collision detection circuit according to claim 1, which is characterized in that the signal deteching circuit, comprising: current value
Detection circuit and electric current pulse width detection circuit；
The input terminal of the current value detection circuit connects the safety control module, the output end of the current value detection circuit
Connect the input terminal of the electric current pulse width detection circuit；The output end of the electric current pulse width detection circuit connects the trigger circuit
Input terminal；
Whether the current value detection circuit, the current value that signal is issued for detecting the safety control module are greater than default electricity
Flow threshold value；When the current value that the safety control module issues signal is greater than the predetermined current threshold, pulsewidth triggering is sent
Signal is to the electric current pulse width detection circuit；
The electric current pulse width detection circuit, for when receiving the pulsewidth trigger signal, detecting the pulsewidth trigger signal
Duration whether be greater than preset time threshold；It is greater than the preset time threshold when the duration of the pulsewidth trigger signal
When value, the air bag igniting signal is confirmly detected, sends the collision trigger signal to the trigger circuit.
3. collision detection circuit according to claim 1, which is characterized in that the current value detection circuit, comprising: electric current
Detect interface circuit, current surveillance module and communication interface circuit；
The current detecting interface circuit is connected between the signal input part and signal output end of the safety control module, institute
Stating current detecting interface circuit includes concatenated first resistor network and second resistance network, total resistance of the first resistor network
Value is less than total resistance value of the second resistance network, and total resistance value of the first resistor network and the second resistance network
The sum of total resistance value is equal to the resistance value of the fuse of the air bag；
The positive input terminal and negative input end of the current surveillance module are connected to the both ends of the first resistor network, described
The control terminal of current surveillance module connects the communication interface circuit, and the output end of the current surveillance module connects the electric current
The input terminal of pulse width detection circuit；The communication interface circuit, for being configured to the predetermined current threshold；
The current surveillance module, for being greater than the predetermined current threshold in the electric current for flowing through the current detecting interface circuit
When, the low level pulsewidth trigger signal is exported to the electric current pulse width detection circuit.
4. collision detection circuit according to claim 3, which is characterized in that the electric current pulse width detection circuit, comprising: different
Step counter；
The resetting pin of the asynchronous counter connects the output end of the current surveillance module, the N of the asynchronous counter
A output pin connects the input terminal of the trigger circuit；N chooses according to the preset time threshold.
5. collision detection circuit according to any one of claims 1-4, which is characterized in that the trigger circuit, comprising:
Data-latching circuit and logic control circuit；
The input terminal of the data-latching circuit connects the output end of the signal deteching circuit, the data-latching circuit it is defeated
Outlet connects the input terminal of the logic control circuit；The output end of the logic control circuit connects the target loop；
The data-latching circuit obtains level catch for locking the level state of the collision trigger signal received
Signal is exported to the logic control circuit；
The logic control circuit, for cutting off the target loop when receiving the level catch signal.
6. collision detection circuit according to claim 5, which is characterized in that the data-latching circuit, comprising: or door；
Described or door first input end connects the output end of the signal deteching circuit, described or door the second input terminal connection
Described or door output end, described or door output end are also connected with the input terminal of the logic control circuit.
7. collision detection circuit according to claim 6, which is characterized in that
Described or door output end is also connected with controller, so that the controller issues collision prompt.
8. collision detection circuit according to claim 5, which is characterized in that the logic control circuit, comprising: NOT gate and
With door；
The input terminal of the NOT gate connects the output end of the data-latching circuit, and the output end of the NOT gate connects described and door
First input end；
Described connect with the second input terminal of door cuts off enable signal, described to connect the target loop with the output end of door；Institute
Cutting enable signal is stated, can be cut off for controlling the target loop.
9. collision detection circuit according to claim 5, which is characterized in that the trigger circuit, further includes: release electricity
Road；
The release circuit, for initializing the data-latching circuit and the logic control circuit.
10. collision detection circuit according to claim 9, which is characterized in that the release circuit, comprising: PMOS tube and
NMOS tube；
The drain electrode of the PMOS tube connects the feeder ear of the data-latching circuit and the feeder ear of the logic control circuit, institute
State the source electrode connection power supply of PMOS tube；
The grid of the PMOS tube connects the drain electrode of the NMOS tube through resistance, and connects the power supply through resistance；
The source electrode of the NMOS tube is grounded, the grid resistance grounded of the NMOS tube and connection release signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910129849.1A CN109910807B (en) | 2019-02-21 | 2019-02-21 | Collision detection circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910129849.1A CN109910807B (en) | 2019-02-21 | 2019-02-21 | Collision detection circuit |
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