CN109910807B - Collision detection circuit - Google Patents
Collision detection circuit Download PDFInfo
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- CN109910807B CN109910807B CN201910129849.1A CN201910129849A CN109910807B CN 109910807 B CN109910807 B CN 109910807B CN 201910129849 A CN201910129849 A CN 201910129849A CN 109910807 B CN109910807 B CN 109910807B
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Abstract
The invention discloses a collision detection circuit, comprising: a signal detection circuit and a trigger circuit; the input end of the signal detection circuit is connected with the safety control module, the output end of the signal detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the target loop; the target circuit is a high-pressure circuit and/or an oil circuit inside the vehicle; the safety control module is used for sending an air bag ignition signal to each air bag when a collision signal detected by a vehicle sensor meets a preset collision condition; the signal detection circuit is used for detecting a signal sent by the safety control module and sending a collision trigger signal to the trigger circuit when detecting an ignition signal of the safety airbag; the trigger circuit is used for sending a collision signal to the target circuit to cut off the target circuit when receiving the collision trigger signal, and a controller is not needed to detect whether collision occurs, so that the detection reliability and the response speed are improved.
Description
Technical Field
The application relates to the technical field of automobiles, in particular to a collision detection circuit.
Background
In order to ensure safety, when a collision occurs, safety control modules of a vehicle, such as an airbag module (ACU or RCM) and an electronic control module (ECU), need to calculate and determine the severity of the collision through signals transmitted from devices such as an acceleration sensor and a peripheral sensor built in the vehicle, transmit an electronic ignition signal (squid) to each airbag at an appropriate timing, and simultaneously transmit a Pulse Width Modulation (PWM) signal, in which the frequency or duty ratio is specifically changed, to other control modules of the vehicle (such as a battery management system BMS and an oil passage supply device), thereby cutting off the supply of a high-pressure circuit and an oil passage inside the vehicle.
When a collision occurs, other control modules (such as a battery management system BMS, an oil path supply device, and the like) need to detect the received PWM signal first to determine whether the collision occurs, and then cut off the supply of a high-pressure circuit and an oil path inside the vehicle, which is not highly reliable and has a control delay.
Disclosure of Invention
In view of this, the embodiment of the present application provides a collision detection circuit, which can solve the problems of low reliability and long delay of collision detection in the prior art.
The embodiment of the application provides a collision detection circuit, includes: a signal detection circuit and a trigger circuit;
the input end of the signal detection circuit is connected with the safety control module, the output end of the signal detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the target loop; the target circuit is a high-pressure circuit and/or an oil circuit in the vehicle; the safety control module is used for sending an air bag ignition signal to each air bag when a collision signal detected by a vehicle sensor meets a preset collision condition;
the signal detection circuit is used for detecting a signal sent by the safety control module and sending a collision trigger signal to the trigger circuit when the safety airbag ignition signal is detected;
and the trigger circuit is used for sending a collision signal to a target loop to cut off the target loop when receiving the collision trigger signal.
Optionally, the signal detection circuit includes: a current value detection circuit and a current pulse width detection circuit;
the input end of the current value detection circuit is connected with the safety control module, and the output end of the current value detection circuit is connected with the input end of the current pulse width detection circuit; the output end of the current pulse width detection circuit is connected with the input end of the trigger circuit;
the current value detection circuit is used for detecting whether the current value of the signal sent by the safety control module is greater than a preset current threshold value; when the current value of the signal sent by the safety control module is greater than the preset current threshold value, sending a pulse width trigger signal to the current pulse width detection circuit;
the current pulse width detection circuit is used for detecting whether the duration time of the pulse width trigger signal is greater than a preset time threshold value or not when the pulse width trigger signal is received; and when the duration time of the pulse width trigger signal is greater than the preset time threshold, determining that the safety airbag ignition signal is detected, and sending the collision trigger signal to the trigger circuit.
Optionally, the current value detecting circuit includes: the current monitoring device comprises a current detection interface circuit, a current monitoring module and a communication interface circuit;
the current detection interface circuit is connected between a signal input end and a signal output end of the safety control module and comprises a first resistor network and a second resistor network which are connected in series, the total resistance value of the first resistor network is smaller than that of the second resistor network, and the sum of the total resistance value of the first resistor network and the total resistance value of the second resistor network is equal to the resistance value of a fuse of the safety airbag;
a positive input end and a negative input end of the current monitoring module are respectively connected to two ends of the first resistance network, a control end of the current monitoring module is connected to the communication interface circuit, and an output end of the current monitoring module is connected to an input end of the current pulse width detection circuit; the communication interface circuit is used for setting the preset current threshold;
and the current monitoring module is used for outputting the pulse width trigger signal of the low level to the current pulse width detection circuit when the current flowing through the current detection interface circuit is greater than the preset current threshold value.
Optionally, the current pulse width detection circuit includes: an asynchronous counter;
a reset pin of the asynchronous counter is connected with an output end of the current monitoring module, and an Nth output pin of the asynchronous counter is connected with an input end of the trigger circuit; and N is selected according to the preset time threshold.
Optionally, the trigger circuit includes: a data latch circuit and a logic control circuit;
the input end of the data latch circuit is connected with the output end of the signal detection circuit, and the output end of the data latch circuit is connected with the input end of the logic control circuit; the output end of the logic control circuit is connected with the target loop;
the data latch circuit is used for locking the level state of the received collision trigger signal to obtain a level locking signal and outputting the level locking signal to the logic control circuit;
and the logic control circuit is used for cutting off the target loop when receiving the level locking signal.
Optionally, the data latch circuit includes: an OR gate;
the first input end of the OR gate is connected with the output end of the signal detection circuit, the second input end of the OR gate is connected with the output end of the OR gate, and the output end of the OR gate is also connected with the input end of the logic control circuit.
Optionally, the output end of the or gate is further connected to a controller, so that the controller sends a collision prompt.
Optionally, the logic control circuit includes: a NOT gate and an AND gate;
the input end of the NOT gate is connected with the output end of the data latch circuit, and the output end of the NOT gate is connected with the first input end of the AND gate;
the second input end of the AND gate is connected with a cut-off enabling signal, and the output end of the AND gate is connected with the target loop; the cut-off enabling signal is used for controlling whether the target loop can be cut off or not.
Optionally, the trigger circuit further includes: a release circuit;
the release circuit is used for initializing the data latch circuit and the logic control circuit.
Optionally, the release circuit includes: PMOS tube and NMOS tube;
the drain electrode of the PMOS tube is connected with the power supply end of the data latch circuit and the power supply end of the logic control circuit, and the source electrode of the PMOS tube is connected with a power supply;
the grid electrode of the PMOS tube is connected with the drain electrode of the NMOS tube through a resistor and is connected with the power supply through a resistor;
the source electrode of the NMOS tube is grounded, and the grid electrode of the NMOS tube is grounded through a resistor and connected with a release signal.
Compared with the prior art, the method has the advantages that:
in the embodiment of the application, the signal detection circuit directly detects the safety airbag ignition signal sent by the safety control module to realize the detection of the occurrence of collision, a controller is not required to detect whether collision occurs or not, and the detection reliability and response speed are improved. When the ignition signal of the safety airbag is detected, the signal detection circuit sends a collision trigger signal to the trigger circuit, and the trigger circuit directly cuts off a high-pressure loop and/or an oil circuit in the vehicle according to the collision trigger signal, so that the safety of the vehicle is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present application, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of a collision detection circuit according to an embodiment of the present disclosure;
FIG. 2 is a graph of current versus time for an airbag ignition signal;
fig. 3 is a schematic structural diagram of another collision detection circuit provided in the embodiment of the present application;
fig. 4 is a schematic structural diagram of a current value detection circuit in a collision detection circuit according to an embodiment of the present disclosure;
FIG. 5 is a schematic structural diagram of a current pulse width detection circuit in a collision detection circuit according to an embodiment of the present disclosure
Fig. 6 is an oscillation curve of an asynchronous counter in a collision detection circuit according to an embodiment of the present disclosure;
fig. 7 is a schematic structural diagram of a trigger circuit in a collision detection circuit according to an embodiment of the present disclosure;
fig. 8 is a circuit topology of a trigger circuit in a collision detection circuit according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a trigger circuit in another collision detection circuit according to an embodiment of the present application;
fig. 10 is a circuit topology of a trigger circuit in another collision detection circuit according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be understood that in the present application, "at least one" means one or more, "a plurality" means two or more. "and/or" for describing an association relationship of associated objects, indicating that there may be three relationships, e.g., "a and/or B" may indicate: only A, only B and both A and B are present, wherein A and B may be singular or plural. The character "/" generally indicates that the former and latter associated objects are in an "or" relationship. "at least one of the following" or similar expressions refer to any combination of these items, including any combination of single item(s) or plural items. For example, at least one (one) of a, b, or c, may represent: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", wherein a, b, c may be single or plural.
The inventors of the present application have found in their research that currently, when a safety control module sends an electronic ignition signal to each airbag, the frequency of a PWM signal sent to other control modules of the vehicle is typically between 10Hz and 250Hz with a period of 100 milliseconds to 4 milliseconds. In order to avoid circuit errors, anti-shake processing causes other control modules of a vehicle to generally need at least two cycles of PWM signals to effectively judge the occurrence of collision, cut off high-pressure loops and oil supply in the vehicle, and control may also be delayed due to the influence of software on resources, resulting in the problems of low reliability and long delay of collision detection.
Therefore, the embodiment of the application provides a collision detection circuit, which can detect the occurrence of collision by directly detecting an electronic ignition signal sent by a safety control module without software judgment of the control module, and can realize stable and quick response and ensure the safety of a vehicle by directly cutting off a high-voltage loop and oil circuit supply when detecting the electronic ignition signal by the collision detection circuit.
Based on the above-mentioned ideas, in order to make the above-mentioned objects, features and advantages of the present application more comprehensible, specific embodiments of the present application are described in detail below with reference to the accompanying drawings.
Referring to fig. 1, the figure is a schematic structural diagram of a collision detection circuit according to an embodiment of the present application.
The collision detection circuit that this application embodiment provided includes: a signal detection circuit 100 and a trigger circuit 200;
the input end of the signal detection circuit 100 is connected to the safety control module ACU, the output end of the signal detection circuit 100 is connected to the input end of the trigger circuit 200, and the output end of the trigger circuit 200 is connected to the target circuit 300.
In the present embodiment, the target circuit 300 may be a high-pressure circuit and/or an oil circuit inside the vehicle. And the safety control module ACU is used for sending an air bag ignition signal to each air bag when the collision signal detected by the vehicle sensor meets the preset collision condition.
The signal detection circuit 100 is used for detecting a signal sent by the safety control module ACU and sending a collision trigger signal to the trigger circuit 200 when detecting an airbag ignition signal;
the trigger circuit 200 is configured to send a collision signal to the target circuit 300 to cut off the target circuit 300 when receiving the collision trigger signal.
In the embodiment of the present application, the signal detection circuit 100 may directly detect a signal sent by the safety control module ACU, and when an airbag ignition signal is detected, it indicates that a vehicle has a collision, and a high-pressure loop and an oil line supply in the vehicle need to be cut off to ensure vehicle safety. Because the signal detection circuit 100 directly detects the ignition signal of the airbag, software is not needed to judge whether the ignition signal is generated or not, the detection reliability is higher, the corresponding speed is higher, and the collision trigger signal can be timely and accurately sent to the trigger circuit 200, so that the trigger circuit 200 can timely and quickly cut off a target loop when the collision occurs.
In practical applications, in order to ensure that the airbag is normally opened, the airbag ignition signal sent by the safety control module ACU generally needs a certain current value and maintains a certain pulse width. Fig. 2 shows, by way of example, a current-time diagram of an airbag ignition signal. As can be seen from fig. 2, the current value of the airbag ignition signal is maintained for 0.5 msec beyond 1.75A to ensure that the airbag is opened.
Therefore, in order to realize normal detection of the airbag ignition signal, in some possible implementations of the embodiment of the present application, as shown in fig. 3, the signal detection circuit 100 may include: a current value detection circuit 101 and a current pulse width detection circuit 102;
the input end of the current value detection circuit 101 is connected with the safety control module ACU, and the output end of the current value detection circuit 101 is connected with the input end of the current pulse width detection circuit 102; the output end of the current pulse width detection circuit 102 is connected with the input end of the trigger circuit 200;
the current value detection circuit 101 is used for detecting whether the current value of a signal sent by the safety control module ACU is greater than a preset current threshold value; when the current value of the signal sent by the safety control module ACU is greater than the preset current threshold value, sending a pulse width trigger signal to the current pulse width detection circuit 102;
the current pulse width detection circuit 102 is configured to detect whether a duration of a pulse width trigger signal is greater than a preset time threshold when the pulse width trigger signal is received; when the duration of the pulse width trigger signal is greater than the preset time threshold, it is determined that an airbag ignition signal is detected, and a collision trigger signal is sent to the trigger circuit 200.
In this embodiment, the current detection circuit 101 continuously sends a pulse width trigger signal with a specific level to the current pulse width detection circuit 102 when the current value of the signal sent by the safety control module ACU is greater than the preset current threshold. For example, when the current value of the signal sent by the safety control module ACU is less than or equal to the preset current threshold, the current detection circuit 101 sends a high level signal to the current pulse width detection circuit 102; once the current value of the signal sent by the safety control module ACU is greater than the preset current threshold, the signal is pulled down to be at a low level, that is, the pulse width trigger signal at the low level is continuously sent to the current pulse width detection circuit 102. In practical application, the pulse width trigger signal may be set according to specific design requirements, and may be a high level signal or a low level signal, which is not limited herein.
When receiving the pulse width trigger signal, the current pulse width detection circuit 102 may determine whether the duration of the pulse width trigger signal is greater than a preset time threshold through the duration of the specific level. Once the duration time of the pulse width trigger signal is greater than the preset time threshold, it is indicated that the duration time of the signal, in which the current value detected by the current value detection circuit 101 is greater than the preset current threshold, exceeds the preset time threshold, and conforms to the characteristics of the airbag ignition signal, the airbag ignition signal is determined to be detected, and a collision trigger signal is sent to the trigger circuit 200, so that the trigger circuit 200 cuts off a target loop, and the safety of the vehicle is ensured.
In practical application, the preset time threshold and the preset current threshold can be set according to the specific form of the airbag ignition signal, so that the airbag ignition signal can be accurately detected. Taking the airbag ignition signal shown in fig. 2 as an example, the preset current threshold may be 1.75A and the preset time threshold may be a value less than 0.5 ms and close to 0.5 ms (e.g., 0.488 ms).
In the embodiment of the application, the signal detection circuit directly detects the safety airbag ignition signal sent by the safety control module to realize the detection of the occurrence of collision, a controller is not required to detect whether collision occurs or not, and the detection reliability and response speed are improved. When the ignition signal of the safety airbag is detected, the signal detection circuit sends a collision trigger signal to the trigger circuit, and the trigger circuit directly cuts off a high-pressure loop and/or an oil circuit in the vehicle according to the collision trigger signal, so that the safety of the vehicle is ensured.
Specific implementations of the current value detection circuit 101 and the current pulse width detection circuit 102 will be illustrated one by one.
Referring to fig. 4, the figure is a schematic structural diagram of a current value detection circuit in a collision detection circuit according to an embodiment of the present application.
In some possible implementation manners of the embodiment of the present application, the current value detecting circuit 101 may specifically include: a current detection interface circuit 41, a current monitoring module 42, and a communication interface circuit 43;
the current detection interface circuit 41 is connected between the signal input end and the signal output end of the safety control module ACU;
the current detection interface circuit 41 includes a first resistor network 41a and a second resistor network 42b connected in series; the sum of the total resistance value of the first resistance network 41a and the total resistance value of the second resistance network 42b is equal to the resistance value of the safety airbag fuse, so that the signal output by the safety control module ACU to the current value detection circuit 101 can be ensured to be consistent with the signal output to the safety airbag, and the accuracy of detecting the safety airbag ignition signal is ensured.
The positive input end and the negative input end of the current monitoring module 42 are respectively connected to two ends of the first resistor network 41a, the control end of the current monitoring module 42 is connected to the communication interface circuit 43, and the output end of the current monitoring module 42 is connected to the input end of the current pulse width detection circuit 102; a communication interface circuit 43 for setting a preset current threshold;
the current monitoring module 42 is configured to output a low-level pulse width trigger signal to the current pulse width detection circuit 102 when the current flowing through the current detection interface circuit 41 is greater than a preset current threshold.
It should be noted that, limited to the detection range of the current monitoring module 42, it is necessary to measure the voltage across the resistor having a small resistance in the current detection interface circuit 41 and measure the current value of the signal output from the measurement safety control module ACU to the current value detection circuit 101. Thus, the total resistance of the first resistor network 41a is less than the total resistance of the second resistor network 42 b. In an example, the sum of the total resistance of the first resistor network 41a and the total resistance of the second resistor network 42b is equal to 2 ohms, and the total resistance of the first resistor network 41a is 0.03 ohms, in a specific implementation, specific structures of the first resistor network 41a and the second resistor network 42b and resistances of resistors included in the first resistor network 41a and the second resistor network 42b may be set according to actual situations.
In the embodiment of the present application, the current monitoring module 42 continuously sends the pulse width trigger signal with a low level to the current pulse width detection circuit 102 when the voltage difference between the two ends of the first resistor network 41a is greater than the preset current threshold. In one example, the current monitoring module 42 may be any type of current monitor, such as a bi-directional current/power monitor type INA226, and a voltage output, uni-directional measured current shunt monitor type INA 270.
It should be noted that, when the current monitor (e.g., INA270) converts the detected current into a voltage output, the voltage value output by the current monitor may be compared with a reference voltage by using a voltage comparator, so as to determine whether the current value detected by the current monitor is greater than a preset current threshold.
In specific implementation, the self-check of the collision detection circuit can be realized through the current setting function of the communication interface circuit 43, for example, a smaller current threshold can be set through the communication interface circuit 43 at each power-on cycle, so that the reliability of the system is improved. In addition, the current condition when no collision occurs can be acquired, and the connection condition of the collision detection circuit can be judged.
Referring to fig. 5, the figure is a schematic structural diagram of a current pulse width detection circuit in a collision detection circuit according to an embodiment of the present application.
In some possible implementation manners of the embodiment of the present application, the current pulse width detection circuit 102 may specifically include: an asynchronous counter CT;
the RESET pin RESET of the asynchronous counter CT is connected to the output of the current monitoring module 42, and the nth output pin of the asynchronous counter CT is connected to the input of the trigger circuit 200.
In the embodiment of the present application, when the input signal is at a low level, the counting condition of the asynchronous counter CT is satisfied, and counting is started. In practical application, any type of counter meeting the requirement can be selected, such as the commonly used counter 4060. The asynchronous counter CT may use a crystal oscillator to generate a pulse signal Osc In with a precise frequency (e.g. 32.768kHz), the oscillation starting time of each output pin is different, as shown In fig. 6, after counting is started (i.e. the RESET pin RESET is at a low level), the 4 th output pin Q4 of the asynchronous counter CT starts to regularly oscillate at the 8 th pulse of the pulse signal Osc In, the 5 th output pin Q5 starts to regularly oscillate at the 16 th pulse of the pulse signal Osc In, the 6 th output pin Q6 starts to regularly oscillate at the 32 th pulse of the pulse signal Osc In, and so on. Therefore, in order to detect whether the pulse width of the low-level pulse width trigger signal output by the current monitoring module 42 is greater than the preset time threshold, the time for regular oscillation of the nth output pin of the asynchronous counter CT may be detected, the nth output pin of the asynchronous counter CT is connected to the input terminal of the trigger circuit 200, and N needs to be selected according to the preset time threshold.
Continuing with the airbag ignition signal shown in fig. 2 as an example, the airbag ignition signal is considered detected when the low level pulse width trigger signal output by the current monitoring module 42 lasts approximately 0.5 milliseconds. Then, the 5 th output pin Q5 of the asynchronous counter CT may be connected to the input terminal of the trigger circuit 200, and when the 5 th output pin Q5 starts to perform regular oscillation, the asynchronous counter CT has calculated 16/32.768kHz to 0.488ms, which may satisfy the requirement that the low-level pulse width trigger signal lasts for nearly 0.5 ms, and may detect the airbag ignition signal so that the trigger circuit 200 cuts off the target circuit 300.
It should be noted that, in practical applications, the nth output pin of the asynchronous counter CT needs to be selected in consideration of noise interference, and N is not small enough. When the current monitoring module 42 outputs a low-level pulse width trigger signal of a duration time period due to transient noise interference, although the asynchronous counter CT starts counting, the asynchronous counter CT cannot maintain a specific time, the nth output pin does not perform regular oscillation, and after the noise is eliminated, the RESET pin RESET is pulled high, and the asynchronous counter CT is cleared, so that the noise interference is avoided. When the RESET pin RESET is pulled low again, the asynchronous counter CT restarts counting.
The following illustrates a specific implementation of the trigger circuit in the embodiment of the present application.
Referring to fig. 7, the diagram is a schematic structural diagram of a trigger circuit in a collision detection circuit according to an embodiment of the present application.
In some possible implementation manners of the embodiment of the present application, the triggering circuit 200 may specifically include: a data latch circuit 201 and a logic control circuit 202;
the input end of the data latch circuit 201 is connected with the output end of the signal detection circuit 100, and the output end of the data latch circuit 201 is connected with the input end of the logic control circuit 202; the output end of the logic control circuit 202 is connected with the target loop 300;
the data latch circuit 201 is used for locking the level state of the received collision trigger signal to obtain a level locking signal and outputting the level locking signal to the logic control circuit 202;
the logic control circuit 202 is configured to shut down the target loop 300 when receiving the level lock signal.
It should be noted that, since the collision trigger signal output by the signal detection circuit 100 may be a pulse signal, which may have an unstable effect on the logic of the subsequent circuit (i.e., the trigger circuit 200), in the embodiment of the present application, the data latch circuit 201 is used to lock the level state of the collision trigger signal.
In some possible implementations, as shown in fig. 8, the data latch circuit 201 may include: an OR gate OG;
a first input terminal of the or gate OG is connected to the output terminal of the signal detection circuit 100, a second input terminal of the or gate OG is connected to the output terminal of the or gate OG, and the output terminal of the or gate OG is further connected to the input terminal of the logic control circuit 202.
In the embodiment of the present application, the output terminal of the or gate OG can be grounded through a pull-down resistor, so that the default output is low. When the output of the signal detection circuit 100 is high (e.g., the output of the asynchronous counter CT is pulled high to start oscillation), the first input of the or gate OG is high, and the output of the or gate OG is also high according to the logic of the or gate, so that the second input of the or gate OG also becomes high. In this way, the output of the data latch circuit 201 can be maintained at a high level regardless of changes in the signal output from the signal detection circuit 100, and the level state of the collision trigger signal can be locked.
In practical applications, the specific implementation manner of the data latch circuit 201 may be specifically set according to the level state of the collision trigger signal, which is not limited in the embodiment of the present application and is not described herein again.
In some possible designs, the output of the or gate OG is also connected to a controller to cause the controller to issue a collision alert to alert the driver or control platform of a collision event.
In some possible implementations of the embodiments of the present application, with continued reference to fig. 8, the logic control circuit 202 may include: NOT gate NG and AND gate AG;
the input end of the not gate NG is connected with the output end of the data latch circuit 201, and the output end of the not gate NG is connected with the first input end of the AND gate AG;
a second input end of the AND gate AG is connected with a disconnection enable signal relaycontrol, and an output end of the AND gate AG is connected with the target loop 300; the shutdown enable signal relaycontrol is used to control whether or not the target circuit 300 can be shut down.
In the present embodiment, when the airbag ignition signal is detected, the not gate NG converts the high level signal output from the data latch circuit 201 into a low level signal, and controls the shutdown of the target circuit 300 together with the shutdown enable signal relaycontrol inside the vehicle. The relay enable signal relay may be a control signal of the relay power supply of the target circuit 300, or may be a control signal enabled by a relay controller, and the relay enable signal relay may be provided by a vehicle interior controller (e.g., MCU). When the outputs of the shutdown enable signal relaycontrol and the not gate NG are both high level, the target circuit 300 is turned on; when either one of the outputs of the disable enable signal relaycontrol and the not gate NG is low, the target circuit 300 is turned off. When the output of the data latch circuit 201 is at a high level, the relay in the target circuit 300 is powered off unconditionally, and the safety of the vehicle is ensured. In the embodiment of the present application, the cutting-off logic of the target loop 300 is not limited, and may be cutting off at a high level, which is not described herein again.
In some possible implementation manners of the embodiment of the present application, as shown in fig. 9, the trigger circuit 200 may further include: a release circuit 203;
and a release circuit 203 for initializing the data latch circuit 201 and the logic control circuit 202.
It should be noted that, since the output of the data latch circuit 201 is always kept at the high level when the collision occurs, the output/control state cannot be changed by itself. Therefore, for subsequent normal use, in some possible implementation manners of the present application, the release signal lockrelease may be output by another controller (e.g., MCU) inside the vehicle, so that the data latch circuit 201 and the logic control circuit 202 are powered down to implement initialization setting.
In some possible designs, as shown in fig. 10, the release circuit 203 may include: a PMOS tube PM and an NMOS tube NM;
the drain electrode of the PMOS tube PM is connected with the power supply end of the data latch circuit 201 and the power supply end of the logic control circuit 202, and the source electrode of the PMOS tube PM is connected with a power supply V; the grid electrode of the PMOS tube PM is connected with the drain electrode of the NMOS tube NM through a resistor and is connected with a power supply V through a resistor;
the source electrode of the NMOS tube NM is grounded; the gate of the NMOS transistor NM is grounded through a resistor and connected to a release signal lockrelease.
When the release signal lockrelease is at a high level, the NMOS transistor NM is turned on, the PMOS transistor PM is turned on, and the power supply V supplies power to the data latch circuit 201 and the logic control circuit 202; when the release signal lockrelease is at a low level, the NMOS transistor NM is turned off, the gate voltage of the PMOS transistor PM is V, the PMOS transistor PM is turned off, and the data latch circuit 201 and the logic control circuit 202 are initialized in a power-down manner.
In practical applications, the PMOS transistor PM and the NMOS transistor NM may be a PNP + NPN composite digital transistor with a model number of UMD3, or may be two independent transistors, which is not limited herein.
It should be noted that, in the present specification, the embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other. The system or the device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
It is further noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a preferred embodiment of the present application and is not intended to limit the present application in any way. Although the present application has been described with reference to the preferred embodiments, it is not intended to limit the present application. Those skilled in the art can now make numerous possible variations and modifications to the disclosed embodiments, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the claimed embodiments. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application still fall within the protection scope of the technical solution of the present application without departing from the content of the technical solution of the present application.
Claims (8)
1. A collision detection circuit, comprising:
a signal detection circuit and a trigger circuit;
the input end of the signal detection circuit is connected with the safety control module, the output end of the signal detection circuit is connected with the input end of the trigger circuit, and the output end of the trigger circuit is connected with the target loop; the target circuit is a high-pressure circuit and/or an oil circuit in the vehicle; the safety control module is used for sending an air bag ignition signal to each air bag when a collision signal detected by a vehicle sensor meets a preset collision condition;
the signal detection circuit is used for detecting a signal sent by the safety control module and sending a collision trigger signal to the trigger circuit when the safety airbag ignition signal is detected;
the signal detection circuit comprises a current value detection circuit and a current pulse width detection circuit;
the current value detection circuit comprises a current detection interface circuit, a current monitoring module and a communication interface circuit;
the current detection interface circuit is connected between a signal input end and a signal output end of the safety control module and comprises a first resistor network and a second resistor network which are connected in series, the total resistance value of the first resistor network is smaller than that of the second resistor network, and the sum of the total resistance value of the first resistor network and the total resistance value of the second resistor network is equal to the resistance value of a fuse of the safety airbag;
a positive input end and a negative input end of the current monitoring module are respectively connected to two ends of the first resistance network, a control end of the current monitoring module is connected to the communication interface circuit, and an output end of the current monitoring module is connected to an input end of the current pulse width detection circuit;
the communication interface circuit is used for setting a preset current threshold;
the current monitoring module is used for outputting a pulse width trigger signal with a low level to the current pulse width detection circuit when the current flowing through the current detection interface circuit is larger than the preset current threshold;
the current pulse width detection circuit is used for detecting whether the duration time of the pulse width trigger signal is greater than a preset time threshold value or not when the pulse width trigger signal is received; when the duration time of the pulse width trigger signal is greater than the preset time threshold, determining that the safety airbag ignition signal is detected, and sending the collision trigger signal to the trigger circuit;
and the trigger circuit is used for sending a collision signal to a target loop to cut off the target loop when receiving the collision trigger signal.
2. The collision detection circuit according to claim 1, wherein the current pulse width detection circuit includes: an asynchronous counter;
a reset pin of the asynchronous counter is connected with an output end of the current monitoring module, and an Nth output pin of the asynchronous counter is connected with an input end of the trigger circuit; and N is selected according to the preset time threshold.
3. The collision detection circuit according to any one of claims 1-2, wherein the trigger circuit comprises: a data latch circuit and a logic control circuit;
the input end of the data latch circuit is connected with the output end of the signal detection circuit, and the output end of the data latch circuit is connected with the input end of the logic control circuit; the output end of the logic control circuit is connected with the target loop;
the data latch circuit is used for locking the level state of the received collision trigger signal to obtain a level locking signal and outputting the level locking signal to the logic control circuit;
and the logic control circuit is used for cutting off the target loop when receiving the level locking signal.
4. The collision detection circuit according to claim 3, wherein the data latch circuit includes: an OR gate;
the first input end of the OR gate is connected with the output end of the signal detection circuit, the second input end of the OR gate is connected with the output end of the OR gate, and the output end of the OR gate is also connected with the input end of the logic control circuit.
5. The collision detection circuit according to claim 4,
the output end of the OR gate is also connected with a controller, so that the controller sends out a collision prompt.
6. The collision detection circuit according to claim 3, wherein the logic control circuit comprises: a NOT gate and an AND gate;
the input end of the NOT gate is connected with the output end of the data latch circuit, and the output end of the NOT gate is connected with the first input end of the AND gate;
the second input end of the AND gate is connected with a cut-off enabling signal, and the output end of the AND gate is connected with the target loop; the cut-off enabling signal is used for controlling whether the target loop can be cut off or not.
7. The collision detection circuit according to claim 3, wherein the trigger circuit further comprises: a release circuit;
the release circuit is used for initializing the data latch circuit and the logic control circuit.
8. The collision detection circuit according to claim 7, wherein the release circuit comprises: PMOS tube and NMOS tube;
the drain electrode of the PMOS tube is connected with the power supply end of the data latch circuit and the power supply end of the logic control circuit, and the source electrode of the PMOS tube is connected with a power supply;
the grid electrode of the PMOS tube is connected with the drain electrode of the NMOS tube through a resistor and is connected with the power supply through a resistor;
the source electrode of the NMOS tube is grounded, and the grid electrode of the NMOS tube is grounded through a resistor and connected with a release signal.
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| CN110481326B (en) * | 2019-08-19 | 2021-03-26 | 宝能(广州)汽车研究院有限公司 | Vehicle and collision detection device thereof |
| CN110758309B (en) * | 2019-10-10 | 2022-08-09 | 威睿电动汽车技术(宁波)有限公司 | Voltage type collision detection circuit |
| CN111645523B (en) | 2019-10-31 | 2021-11-02 | 长城汽车股份有限公司 | Vehicle control device, system and vehicle |
| CN111289262B (en) * | 2020-02-21 | 2021-08-24 | 威睿电动汽车技术(宁波)有限公司 | Current type collision detection circuit and system |
| CN113815422A (en) * | 2020-06-18 | 2021-12-21 | 宁德时代新能源科技股份有限公司 | Collision detection circuit, battery management system and vehicle |
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