CN107966987B - Constant-speed cruise signal acquisition circuit, constant-speed cruise control system and automobile - Google Patents
Constant-speed cruise signal acquisition circuit, constant-speed cruise control system and automobile Download PDFInfo
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Abstract
The invention provides a constant-speed cruise signal acquisition circuit, a constant-speed cruise control system and an automobile, and relates to the technical field of automobiles. According to the embodiment of the invention, the plurality of voltage division elements which are sequentially connected in series and the switch elements which are connected with different voltage division elements in parallel are arranged, so that the controller can judge the user operation according to the voltage value at the voltage acquisition point under the condition that a user presses the function button and the corresponding switch elements are closed, thereby realizing the acquisition of various control signals through one controller interface and saving the interface resources of the controller.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a constant-speed cruise signal acquisition circuit, a constant-speed cruise control system and an automobile.
Background
In the face of increasingly severe energy and environmental problems, the increasing demand of traditional fuel oil vehicles for petroleum resources and the environmental pollution caused by the demand have attracted people increasingly, and meanwhile, energy-saving and new energy vehicles are becoming hot spots for research in various countries. Energy-saving and new energy automobiles which are one of strategic emerging industries in China are highly valued by governments and industries, and development of new energy automobiles, particularly pure electric automobiles with zero pollution and zero emission, has great significance for energy safety and environmental protection in China, is an important direction for realizing transformation upgrading and technical breakthrough in the automobile field in China, and is a trend for future development of the automobile field.
Cruise Control (CC) is one of vehicle assistant driving technologies, is used for reducing the operation intensity of a driver, and is currently applied to a conventional fuel vehicle. In the conventional fuel vehicle, once the vehicle is set to a cruising state, the fuel supply amount of the engine and the opening degree of a throttle valve are controlled by a driving computer, and the driving computer can be continuously adjusted according to the road condition and the driving resistance of the vehicle to keep the vehicle to be driven at the set speed all the time, so that the driver does not need to operate the throttle valve, thereby reducing the driving fatigue, and simultaneously reducing unnecessary vehicle speed change to save fuel. Because the pure electric vehicle has the characteristic of motor drive, compared with the traditional fuel vehicle, the pure electric vehicle has inherent advantages of performing constant-speed cruise control, and thus becomes a research hotspot of various current pure electric vehicle manufacturers and scientific research institutions.
In order to facilitate user operation and collect relevant data, in the related art, a plurality of collecting circuits are arranged to collect operation input of a user, and meanwhile, the corresponding controllers need to be connected with the collecting circuits through a plurality of interfaces. However, in the situation that the vehicle functions are more and more complicated, more and more signal acquisition devices need to be connected to the controller, so that the interface resources of the controller are very tight.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a constant-speed cruise signal acquisition circuit, a constant-speed cruise control system and an automobile, which are used for acquiring different user operation information through one controller port.
In order to solve the above technical problem, an embodiment of the present invention provides a constant-speed cruise signal acquisition circuit, including:
a power supply;
the first voltage division element, the second voltage division element, the third voltage division element, the fourth voltage division element, the fifth voltage division element and the sixth voltage division element are sequentially connected in series, wherein the sixth voltage division element is grounded;
a first switching element connected in parallel to both ends of the second voltage dividing element and the third voltage dividing element arranged in series;
the second switching element is connected in parallel to two ends of the fourth voltage division element and the fifth voltage division element which are arranged in series;
a third switching element connected in parallel to both ends of the third voltage dividing element and the fourth voltage dividing element arranged in series;
a fourth switching element connected in parallel across the third voltage dividing element, the fourth voltage dividing element and the fifth voltage dividing element arranged in series;
a voltage collection point disposed between the first voltage dividing element and the second voltage dividing element; and the number of the first and second groups,
and the controller is connected to the voltage acquisition point and is used for acquiring a voltage value at the voltage acquisition point and executing a preset operation matched with the voltage value.
Further, the first voltage dividing element, the second voltage dividing element, the third voltage dividing element, the fourth voltage dividing element, the fifth voltage dividing element and the sixth voltage dividing element are resistors with different resistance values.
Further, the controller is connected to the voltage acquisition point through a filter circuit;
wherein the filter circuit comprises:
a seventh voltage dividing element;
and the capacitor is connected with the seventh voltage division element in series and is grounded.
Further, the seventh voltage dividing element is a resistor, and a resistance value of the seventh voltage dividing element is greater than any one of the first voltage dividing element, the second voltage dividing element, the third voltage dividing element, the fourth voltage dividing element, the fifth voltage dividing element, and the sixth voltage dividing element.
Further, the controller includes:
the acquisition module is used for acquiring a voltage value at a voltage acquisition point;
the matching module is used for determining preset voltage intervals in which the voltage values are positioned according to the voltage values, wherein each preset voltage interval corresponds to a preset operation instruction;
and the execution module is used for executing a preset operation instruction corresponding to the preset voltage interval according to the preset voltage interval.
Further, the acquisition module comprises:
the acquisition unit is used for continuously acquiring the actual voltage value at the voltage acquisition point within a preset time period;
the first acquisition unit is used for acquiring an average voltage value in the preset time period according to the acquired actual voltage value;
and the second acquisition unit is used for acquiring the voltage value at the voltage acquisition point according to the average voltage value.
Further, the preset voltage interval includes:
the cruise control circuit comprises a first preset voltage interval, a second preset voltage interval and a third preset voltage interval, wherein the first preset voltage interval represents that the current cruise control signal acquisition circuit is in a normal working state, and a theoretical voltage value at a voltage acquisition point is located in the first preset voltage interval under the condition that the first switch element, the second switch element, the third switch element and the fourth switch element are all disconnected;
a second preset voltage interval, wherein the preset operation instruction corresponding to the second preset voltage interval comprises: controlling to enter a constant-speed cruise mode or exit the constant-speed cruise mode, wherein when the first switch element is closed and the second switch element, the third switch element and the fourth switch element are all opened, the theoretical voltage value at the voltage acquisition point is located in the second preset voltage interval;
a third preset voltage interval, wherein the preset operation instruction corresponding to the third preset voltage interval comprises: controlling the current constant-speed cruise vehicle speed to increase a first preset value, wherein the second switch element is closed, and the theoretical voltage value at the voltage acquisition point is within a third preset voltage interval under the condition that the first switch element, the third switch element and the fourth switch element are all opened;
a fourth preset voltage interval, wherein the preset operation instruction corresponding to the fourth preset voltage interval comprises: controlling the current constant-speed cruise vehicle speed to reduce a second preset value, wherein the third switching element is closed, and the theoretical voltage value at the voltage acquisition point is located in a fourth preset voltage interval under the condition that the first switching element, the second switching element and the fourth switching element are all opened;
a fifth preset voltage interval, wherein the preset operation instruction corresponding to the fifth preset voltage interval is as follows: and controlling to enter the constant-speed cruise mode, controlling the constant-speed cruise vehicle speed to be the constant-speed cruise vehicle speed when the vehicle is last exited or controlling to exit the constant-speed cruise mode currently, wherein the fourth switching element is closed, and under the condition that the first switching element, the second switching element and the third switching element are all opened, the theoretical voltage value at the voltage acquisition point is located in the fifth preset voltage interval.
Further, the preset voltage interval includes:
a sixth preset voltage interval, wherein the preset operation instruction corresponding to the sixth preset voltage interval includes: controlling to send out first early warning information, wherein the theoretical voltage value at the voltage acquisition point is located in a sixth preset voltage interval under the condition that the first switch element and the third switch element are both closed and the second switch element and the fourth switch element are both opened;
a seventh preset voltage interval, wherein the preset operation instruction corresponding to the seventh preset voltage interval includes: controlling to send out second early warning information, wherein the first switch element and the second switch element are both closed, and under the condition that the third switch element and the fourth switch element are both opened, the theoretical voltage value at the voltage acquisition point is located in the seventh preset voltage interval;
an eighth preset voltage interval, wherein the preset operation instruction corresponding to the eighth preset voltage interval includes: controlling to send out third early warning information, wherein the first switch element and the fourth switch element are both closed, and under the condition that the second switch element and the third switch element are both opened, the theoretical voltage value at the voltage acquisition point is located in the eighth preset voltage interval;
a ninth preset voltage interval, wherein the preset operation instruction corresponding to the ninth preset voltage interval includes: and controlling to send out fourth early warning information, wherein the second switching element and the third switching element are both closed, and under the condition that the first switching element and the fourth switching element are both opened, the theoretical voltage value at the voltage acquisition point is located in the ninth preset voltage interval.
Further, the preset operation instructions corresponding to the sixth preset voltage interval, the seventh preset voltage interval, the eighth preset voltage interval, and the ninth preset voltage interval further include:
controlling and detecting the current working state, and controlling the vehicle to prohibit from entering the constant-speed cruise mode when the vehicle is not in the constant-speed cruise mode currently; and when the vehicle is currently in the constant-speed cruise mode, controlling the vehicle to exit the constant-speed cruise mode.
Further, the controller further includes:
and the first early warning module is used for controlling to send out fifth early warning information when the voltage value is not in any one of a first preset voltage interval, a second preset voltage interval, a third preset voltage interval, a fourth preset voltage interval, a fifth preset voltage interval, a sixth preset voltage interval, a seventh preset voltage interval, an eighth preset voltage interval and a ninth preset voltage interval, and the duration time is longer than a preset time threshold.
Further, the controller further includes:
and the second early warning module is used for controlling to send out sixth early warning information when the voltage value is greater than the first preset voltage value or less than the second preset voltage value.
According to another aspect of the present invention, an embodiment of the present invention further provides a cruise control system, including the cruise control signal acquisition circuit as described above.
According to another aspect of the invention, the embodiment of the invention also provides an automobile, which comprises the constant-speed cruise control system.
Compared with the prior art, the constant-speed cruise signal acquisition circuit, the constant-speed cruise control system and the automobile provided by the embodiment of the invention at least have the following beneficial effects:
according to the embodiment of the invention, the plurality of voltage division elements which are sequentially connected in series and the switch elements which are connected with different voltage division elements in parallel are arranged, so that the controller can judge the user operation according to the voltage value at the voltage acquisition point under the condition that a user presses the function button and the corresponding switch elements are closed, thereby realizing the acquisition of various control signals through one controller interface and saving the interface resources of the controller.
Drawings
FIG. 1 is a circuit diagram of a constant speed cruise signal acquisition circuit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a controller according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a cruise control panel according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a constant-speed cruise control system according to an embodiment of the present invention.
Detailed Description
In order to make the technical problems, technical solutions and advantages of the present invention more apparent, the following detailed description is given with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help the full understanding of the embodiments of the present invention. Thus, it will be apparent to those skilled in the art that various changes and modifications may be made to the embodiments described herein without departing from the scope and spirit of the invention. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.
It should be appreciated that reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present invention. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In various embodiments of the present invention, it should be understood that the sequence numbers of the following processes do not mean the execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Referring to fig. 1 to 3, an embodiment of the present invention provides a constant-speed cruise signal acquisition circuit, including:
a power supply Vcc;
a first voltage dividing element R1, a second voltage dividing element R2, a third voltage dividing element R3, a fourth voltage dividing element R4, a fifth voltage dividing element R5 and a sixth voltage dividing element R6 which are connected in series in sequence, wherein the sixth voltage dividing element R6 is grounded;
a first switching element K1, the first switching element K1 being connected in parallel across the second voltage dividing element R2 and the third voltage dividing element R3 arranged in series;
a second switching element K2, the second switching element K2 being connected in parallel across the series arrangement of the fourth voltage dividing element R4 and the fifth voltage dividing element R5;
a third switching element K3, the third switching element K3 being connected in parallel to both ends of the third voltage dividing element R3 and the fourth voltage dividing element R4 which are arranged in series;
a fourth switching element K4, the fourth switching element K4 being connected in parallel across the third voltage dividing element R3, the fourth voltage dividing element R4 and the fifth voltage dividing element R5 arranged in series;
a voltage collection point disposed between the first voltage dividing element R1 and the second voltage dividing element R2; and the number of the first and second groups,
the controller 1 is connected to the voltage collecting point, and the controller 1 is used for collecting a voltage value at the voltage collecting point and executing a preset operation matched with the voltage value.
According to the embodiment of the invention, the plurality of voltage division elements which are sequentially connected in series and the switch elements which are connected in parallel with different voltage division elements are arranged, so that the controller 1 can judge the user operation according to the voltage value at the voltage acquisition point under the condition that a user presses the function button and the corresponding switch elements are closed, thereby realizing the acquisition of various control signals through one controller 1 interface and saving the interface resources of the controller 1.
Wherein the first voltage dividing element R1, the second voltage dividing element R2, the third voltage dividing element R3, the fourth voltage dividing element R4, the fifth voltage dividing element R5, and the sixth voltage dividing element R6 are resistors having different resistance values from each other.
With continued reference to fig. 1, wherein the controller 1 is connected to the voltage collection point through a filter circuit; wherein the filter circuit comprises: a seventh voltage dividing element R7; a capacitor C1 connected in series with the seventh voltage dividing element R7, the capacitor being connected to ground.
Wherein the seventh voltage dividing element R7 is a resistor, and a resistance value of the seventh voltage dividing element R7 is larger than any one of the first voltage dividing element R1, the second voltage dividing element R2, the third voltage dividing element R3, the fourth voltage dividing element R4, the fifth voltage dividing element R5, and the sixth voltage dividing element R6.
The invention will now be further illustrated by way of example. Referring to fig. 3, in an embodiment of the present invention, an operation input of a user may be collected by setting a constant-speed-cruise control panel, where the constant-speed-cruise control panel may include four resilient buttons, which are "ON/OFF", "SET/", "RES/+" and "CANCEL", respectively, and have meanings as follows: the 'ON/OFF' button is used for the operation of entering and exiting the constant-speed cruise mode by the driver, the button is a compound button, the button is pressed under the non-constant-speed cruise state to indicate that the driver has the requirement of entering the constant-speed cruise, and similarly, the button is pressed under the constant-speed cruise mode to indicate that the driver has the requirement of exiting the constant-speed cruise; the "SET/-" button is used to enter a cruise control mode and SET a cruise control speed (reduce the vehicle speed); the RES/plus button is used for entering a constant-speed cruise mode and setting a constant-speed cruise speed (increasing the speed); the "CANCEL" button is used for operation to temporarily exit the cruise mode. Among them, for the above four buttons, the "ON/OFF" button may correspond to the first switching element K1, the "RES/+" button may correspond to the second switching element K2, the "SET/-" button may correspond to the third switching element K3, and the "CANCEL" button may correspond to the fourth switching element K4.
The description continues with the above example. Referring to fig. 1, R1, R2, R3, R4, R5 and R6 form a voltage dividing circuit under the action of a power supply Vcc, wherein Vcc may be selected to be 5V in an ideal state. Referring to fig. 3, taking the first switch element K1, i.e. the "ON/OFF" button as an example, the OFF state in fig. 1 is maintained when the button is not pressed, and when the button is pressed, the R2 and R3 are in a short circuit state, and compared with the case where all the buttons are not pressed, the voltage at the voltage collecting point a in the figure changes, and the voltage is collected by the controller 1, for example, when the controller 1 is not a motor controller, the voltage can be collected by the a/D port of the motor controller. R7 and C1 in fig. 1 are RC low-pass filter circuits according to embodiments of the present invention, and are designed to filter out high-frequency interference, so that the voltage at the voltage collecting point a is equal to the voltage at the voltage collecting point B in a steady state, and R7 can also function as a current-limiting function, thereby preventing damage to the collecting port of the controller 1 due to a fault or the like. According to the characteristics of the acquisition circuit, the state of each button can be obtained through the change of the acquired voltage at the voltage acquisition point A after the button is pressed down, and the user operation is judged according to the voltage value at the voltage acquisition point, so that the acquisition of various control signals is realized through one controller 1 interface, and the interface resources of the controller 1 are saved.
The embodiment of the invention can obtain the state information of four keys through one A/D acquisition interface of the controller 1, saves precious interface resources of the controller 1, and has high reliability because the acquisition circuit can be composed of a resistor and a capacitor. In addition, the embodiment of the invention realizes the voltage change at the detection point by short-circuiting two or more series resistors, so that the voltage change is more obvious compared with the short-circuiting of a single resistor, and great convenience is provided for subsequent signal processing.
Meanwhile, the acquisition circuit provided by the embodiment of the invention also has a function of detecting faults of the sampling loop, so that a solid foundation is laid for subsequent fault detection. The sampling loop fault is judged by collecting voltage at a voltage collecting point B in the graph, and may be:
a. short circuit fault of sampling loop to power supply
The short circuit of the power supply corresponds to the short circuit of the power supply at the voltage acquisition point B in the figure 1 and is in short circuit with the power supply, and the voltage value acquired by the controller 1 is near the power supply voltage;
b. short circuit fault of sampling loop to ground
The short circuit to ground corresponds to the short circuit to ground at the voltage acquisition point B in fig. 1, and the voltage value acquired by the controller 1 is near 0V (voltage at GND);
c. occurrence of sampling loop open circuit fault
The open circuit corresponds to the open circuit fault occurring at the voltage acquisition point a in fig. 1, when the voltage value acquired by the controller 1 is near the power supply voltage.
The reasonable selection of the resistance values of the voltage dividing elements can facilitate the distinction of the voltage values at the voltage acquisition points of different switch elements in the closed state, so that the invention provides a preferred embodiment as follows: r1 is 270 ohms; r2 is 100 ohms; r3 is 220 ohms; r4 is 330 ohms; r5 is 430 ohms; r6 is 50 ohms; r7 is 33 kohms; c1 is 47 nanofarads, where the resistance selected is preferably a high precision resistance with a tolerance of 0.1%. The reasonable selection of R1, R2, R3, R4, R5 and R6 can effectively distinguish the key voltage, even if the minimum difference of the voltages collected by the controller 1 after different buttons are pressed is more than 0.2V, so that the problem of key analysis error caused by too small pressure difference is avoided; in addition, reasonable selection of R7 and C1 can play a role in filtering high-frequency interference. It should be noted that the selection of the resistance value is only a preferred embodiment provided by the present invention, the present invention is not limited to the above embodiment, and the resistance value of each voltage dividing element can be selected according to the requirement.
Referring to fig. 2, the controller 1 may include:
the acquisition module 11 is used for acquiring a voltage value at a voltage acquisition point;
the matching module 12 is configured to determine a preset voltage interval in which the voltage value is located according to the voltage value, where each preset voltage interval corresponds to a preset operation instruction;
and the execution module 13 is configured to execute a preset operation instruction corresponding to the preset voltage interval according to the preset voltage interval.
In the embodiment of the invention, a plurality of preset voltage intervals are set, so that the current switching element can be judged to be closed or in a fault condition according to the preset voltage interval matched with the acquired voltage value, and corresponding operation can be executed.
With continued reference to fig. 2, wherein the acquisition module may include:
the acquisition unit 111 is used for continuously acquiring the actual voltage value at the voltage acquisition point within a preset time period;
a first obtaining unit 112, configured to obtain an average voltage value in the preset time period according to the acquired actual voltage value;
and a second obtaining unit 113, configured to obtain a voltage value at the voltage acquisition point according to the average voltage value.
The controller 1 of the embodiment of the invention can firstly filter the voltage after the voltage is collected, and the accuracy of voltage collection is improved by adopting a median average filtering method. The specific method can be as follows: first, the voltage values of N sampling periods are obtained, then a maximum value and a minimum value are removed, and then the arithmetic mean value of N-2 data is calculated to make the value be the filtered acquisition voltage, wherein the sampling period N can be 12. The average rate wave method can eliminate the sampling value deviation caused by pulse interference.
Wherein the preset voltage interval may include:
a first preset voltage interval, wherein the first preset voltage interval indicates that the current constant-speed cruise signal acquisition circuit is in a normal working state, and when the first switch element K1, the second switch element K2, the third switch element K3 and the fourth switch element K4 are all turned off, a theoretical voltage value at the voltage acquisition point is within the first preset voltage interval;
a second preset voltage interval, wherein the preset operation instruction corresponding to the second preset voltage interval comprises: controlling to enter a constant-speed cruise mode or exit the constant-speed cruise mode, wherein the theoretical voltage value at the voltage collection point is within the second preset voltage interval under the condition that the first switching element K1 is closed, and the second switching element K2, the third switching element K3 and the fourth switching element K4 are all opened;
a third preset voltage interval, wherein the preset operation instruction corresponding to the third preset voltage interval comprises: controlling the current constant-speed cruise vehicle speed to increase by a first preset value, wherein the second switch element K2 is closed, and under the condition that the first switch element K1, the third switch element K3 and the fourth switch element K4 are all opened, the theoretical voltage value at the voltage acquisition point is located in a third preset voltage interval;
a fourth preset voltage interval, wherein the preset operation instruction corresponding to the fourth preset voltage interval comprises: controlling the current constant-speed cruise vehicle speed to be reduced by a second preset value, wherein the third switching element K3 is closed, and under the condition that the first switching element K1, the second switching element K2 and the fourth switching element K4 are all opened, the theoretical voltage value at the voltage collecting point is located in a fourth preset voltage interval;
a fifth preset voltage interval, wherein the preset operation instruction corresponding to the fifth preset voltage interval is as follows: and controlling to enter the constant-speed cruise mode, and controlling the constant-speed cruise vehicle speed to be the constant-speed cruise vehicle speed when the vehicle is last exited or controlling to exit the constant-speed cruise mode currently, wherein when the fourth switching element K4 is closed, and the first switching element K1, the second switching element K2 and the third switching element K3 are all opened, the theoretical voltage value at the voltage collection point is located in the fifth preset voltage interval.
The description continues with the above example. Under normal operation, the buttons in the operation panel shown in fig. 3 have five states, which are: none of the keys is pressed, the "ON/OFF" key is pressed, the "SET/-" key is pressed, the "RES/+" key is pressed, and the "CANCEL" key is pressed, which will be described below.
No press key
According to fig. 1, ideally, when all the switch elements are turned off, i.e. when no button on the panel is pressed, the voltage collected by the controller 1 is calculated as follows:
wherein VnoneThe voltage collected by the motor controller when the switching elements are all disconnected is shown, and if the power supply voltage is 5V, the theoretical voltage V at the voltage collection point is shownnoneIt was 4.036V.
② the ON/OFF key is pressed
When only the first switching element K1 is pressed, R2 and R3 are short-circuited, and the voltage V acquired by the controller 1 at this timeon/offThe calculation method is as follows:
v in the ideal stateon/offIt was 3.75V.
③ SET/- "key is pressed
When only the third switching element K3 is pressed, R3 and R4 are short-circuited, and the voltage V acquired by the controller 1 at this time issetThe calculation method is as follows:
v in the ideal statesetIs 3.412V.
(RES/+ "key pressed)
When only the second switching element K2 is pressed, R4 and R5 are short-circuited, and the voltage V acquired by the controller 1 at this timeresThe calculation method is as follows:
v in the ideal stateres2.891V.
Fifthly, the CANCEL key is pressed
When only the fourth switching element K4 is pressed, R3, R4 and R5 are short-circuited, and the voltage V acquired by the controller 1 at this time iscancelThe calculation method is as follows:
v in the ideal statecancel1.786V.
It can be found from the expressions (1) to (5) that when the collected voltage is Vnone、Von/off、Vset、VresAnd VcancelWithin the reasonable neighborhood range, the specific key operation of the driver can be judged.
The method comprises the following steps that (1) to (5) show the voltage collected by a motor controller when a key is pressed in an ideal state, but in practice, the power supply voltage can be generated through a power supply chip in the motor controller or a power supply is arranged, but certain errors exist in the power supply voltage, so that the embodiment of the invention judges a voltage interval instead of a voltage point when the key is operated.
Judging the state of no key press
When the voltage V satisfies the following condition for 100ms, it is determined that all the buttons in the cruise control panel are not pressed at this time.
② ON/OFF key state judgment
When the voltage V satisfies the following condition for 100ms, it is judged that only the first switching element K1, i.e., the "ON/OFF" key, is pressed.
③ SET/-Key State judgment
When the voltage V satisfies the following condition and lasts for 100ms, it is judged that only the third switching element K3, i.e., the "SET/-" key, is pressed.
RES/+ "key state judgment
When the voltage V satisfies the following condition and lasts for 100ms, it is determined that only the second switching element K2, i.e., the "RES/+" key, is pressed.
Judgment of "CANCEL" key status
When the voltage V satisfies the following condition for 100ms, it is judged that only the fourth switching element K4, i.e., the "CANCEL" key is pressed.
According to the expressions (6) to (10), the key operation of the driver in the normal state is obtained by judging the section where the collected voltage V is located, wherein the voltage judgment section specified by the invention is within the range of +/-0.1V on the basis of the ideal voltage value, and the range can ensure that the key operation of the driver is reliably and effectively detected by adopting the circuit shown in the figure 1 and the methods described by the expressions (6) to (10) under the condition that the power chip has the accuracy of 4%, so that the voltage judgment sections are not overlapped.
It should be noted that, the above is only a preferred embodiment of the present invention, and the preset voltage interval may also be a preset voltage value floating above or below the theoretical voltage value, and the preset voltage value may be 0.05-0.2V.
Wherein, the preset voltage interval may further include:
a sixth preset voltage interval, wherein the preset operation instruction corresponding to the sixth preset voltage interval includes: controlling to send out first warning information, wherein when the first switching element K1 and the third switching element K3 are both closed, and the second switching element K2 and the fourth switching element K4 are both opened, the theoretical voltage value at the voltage collecting point is within the sixth preset voltage interval;
a seventh preset voltage interval, wherein the preset operation instruction corresponding to the seventh preset voltage interval includes: controlling to send out second warning information, wherein when the first switching element K1 and the second switching element K2 are both closed, and the third switching element K3 and the fourth switching element K4 are both opened, the theoretical voltage value at the voltage collecting point is within the seventh preset voltage interval;
an eighth preset voltage interval, wherein the preset operation instruction corresponding to the eighth preset voltage interval includes: controlling to send out third early warning information, wherein when the first switching element K1 and the fourth switching element K4 are both closed, and the second switching element K2 and the third switching element K3 are both opened, the theoretical voltage value at the voltage collecting point is within the eighth preset voltage interval;
a ninth preset voltage interval, wherein the preset operation instruction corresponding to the ninth preset voltage interval includes: and controlling to send out fourth early warning information, wherein when the second switching element K2 and the third switching element K3 are both closed, and when the first switching element K1 and the fourth switching element K4 are both opened, the theoretical voltage value at the voltage collecting point is within the ninth preset voltage interval.
The description continues with the above example. The first to fifth preset voltage intervals correspond to normal working states, but due to hardware, non-standard operation of a driver and the like, only one key is pressed at the same time, the sixth to ninth preset voltage intervals correspond to abnormal conditions, and the abnormal reason can be judged according to the voltage interval where the voltage value of the battery is located so as to carry out corresponding operation.
When the voltage value collected in a preset time period is within a preset voltage range, and the preset voltage range is not within a first preset voltage range, early warning information is sent out. Wherein a key-sticking anomaly is considered to occur when any one of the switching elements shown in fig. 1 is pressed for more than 20 seconds. The abnormal key adhesion is possibly caused by mechanical and physical reasons and can also be caused by the unconventional operation of the driver, and the judgment time specified by the embodiment of the invention fully considers the reasonable operation time of the driver.
The embodiment of the invention also provides voltage intervals of abnormal states of a plurality of pressed keys, which are respectively as follows: the "ON/OFF" and "SET/-" keys are pressed simultaneously, the "ON/OFF" and "RES/+" keys are pressed simultaneously, the "ON/OFF" and "CANCEL" keys are pressed simultaneously, and the "SET/-" and "RES/+" keys are pressed simultaneously. The embodiment of the present invention does not detect the state where the "SET/-" and "CANCEL" keys are simultaneously pressed and the "RES/+" and "CANCEL" keys are simultaneously pressed, and the other two double keys are simultaneously pressed, for the following reasons: according to the acquisition circuit shown in fig. 1, the voltage V acquired in these two states is the same as when only "CANCEL" is pressed, and considering that the function of the "CANCEL" key is to temporarily exit the cruise control, the function of temporarily exiting the cruise control can be realized even if the above-described two simultaneous key operations occur, and there is no safety hazard, so that the detection thereof is not performed. The following judgment methods are given for the case where the four kinds of multi-keys mentioned are pressed:
(ii) the ON/OFF key and the SET/- "key are simultaneously pressed and determined
When the keys of the first switch element K1 and the third switch element K3 are pressed simultaneously, the voltage collected by the controller 1 at this time is:
The invention provides that the "ON/OFF" and "SET/-" keys are pressed simultaneously when the voltage V satisfies the following condition for 100 ms.
② ON/OFF and RES/+ "keys are simultaneously pressed for judgment
When the first switch element K1 and the second switch element K2 are pressed simultaneously, the voltage collected by the controller 1 at this time is:
when the voltage V satisfies the following condition for 100ms, it is determined that the first switching element K1 and the second switching element K2 are simultaneously pressed.
③ ON/OFF and CANCEL keys are pressed simultaneously
The voltage that motor controller gathered at this moment is:
When the voltage V satisfies the following condition for 100ms, it is determined that the first switching element K1 and the fourth switching element K4 are simultaneously pressed.
SET/- "and RES/+" keys are simultaneously pressed for judgment
The voltage collected by the controller 1 at this time is:
When the voltage V satisfies the following condition and lasts for 100ms, it is judged that the second switching element K2 and the third switching element K3 are simultaneously pressed.
Because the probability that the three or four keys are pressed simultaneously is low and can be essentially decomposed into the combination of the situation that the two keys and the single key are pressed simultaneously, the embodiment of the invention can not detect the three keys and can classify the three keys and the four keys into other abnormal categories.
It can be understood that, the above-mentioned ± 0.08V obtains the preset voltage range in the case of the fault on the range of the theoretical voltage value, where 0.08V is only a preferred voltage value, and can also be set as required, for example, to 0.05-1V, so as to obtain the sixth to ninth preset voltage intervals.
Further, the preset operation instructions corresponding to the sixth preset voltage interval, the seventh preset voltage interval, the eighth preset voltage interval, and the ninth preset voltage interval may further include:
controlling and detecting the current working state, and controlling the vehicle to prohibit from entering the constant-speed cruise mode when the vehicle is not in the constant-speed cruise mode currently; and when the vehicle is currently in the constant-speed cruise mode, controlling the vehicle to exit the constant-speed cruise mode.
When the collected voltage value is in the sixth to ninth preset voltage intervals, a fault may occur, so that the vehicle is prohibited from entering the constant-speed cruise mode for driving safety, and if the vehicle is in the constant-speed cruise mode, the vehicle exits, and the instrument is controlled to light the cruise prohibition indicator lamp, so that safety is ensured, and a driver is prompted. When the acquired voltage value is within the first to fifth preset voltage intervals, the current state can be judged to be no longer in the fault condition, and the constant-speed cruise mode can be entered again according to the closing condition of the switch element so as to meet the requirements of users.
Referring to fig. 2, the controller 1 may further include:
and the first early warning module is used for controlling to send out fifth early warning information when the voltage value is not in any one of the first preset voltage interval, the second preset voltage interval, the third preset voltage interval, the fourth preset voltage interval, the fifth preset voltage interval, the sixth preset voltage interval, the seventh preset voltage interval, the eighth preset voltage interval and the ninth preset voltage interval, and the duration time is longer than a preset time threshold.
Wherein the controller 1 may further include: and the second early warning module is used for controlling to send out sixth early warning information when the voltage value is greater than the first preset voltage value or less than the second preset voltage value.
The preset time threshold may be 80-120 ms. The warning information may be text information displayed on the instrument display panel, for example, the fifth warning information may be a request to not press a plurality of cruise control buttons at the same time, the sixth warning information may be that the cruise control module is abnormal, the cruise control function is to be disabled, and the like. The early warning information can also be voice prompt information or the combination of text prompt information and voice prompt information.
According to the embodiment of the invention, different processing methods are respectively given according to different abnormal conditions of the constant-speed cruise acquisition circuit, a driver is reminded in the modes of an instrument indicator light, a character prompt and a prompt tone, and meanwhile, the driving safety is guaranteed in the mode of controlling the enabling of the constant-speed cruise function. The controller 1 provided by the embodiment of the invention can ensure that the driver can obtain the state information of the constant-speed cruise system in time on the premise of ensuring the driving safety by the abnormal state processing method, thereby maintaining the driving feeling.
Referring to fig. 3 and 4, according to another aspect of the present invention, an embodiment of the present invention further provides a cruise control system, including the cruise control signal acquisition circuit as described above.
The controller 1 in the constant-speed cruise signal acquisition circuit can be a motor controller MCU. The constant speed cruise control system architecture of the embodiment of the present invention is shown in fig. 4. Wherein HB denotes a vehicle handbrake, GP denotes a gear system, APS denotes an accelerator pedal, BPS denotes a brake pedal, BMS denotes a battery management system, CCP denotes a constant speed cruise operation panel, ASR denotes a drive anti-skid system, EPB denotes a parking control system, ABS denotes a brake anti-lock system, ESP denotes a vehicle stability control system, and ICM denotes a vehicle meter. In the system, a constant-speed cruise function is mainly completed by a motor controller MCU, firstly, the motor controller collects information of a constant-speed cruise operation panel CCP to obtain the constant-speed cruise intention of a driver, then, according to state information of a vehicle hand brake HB, a gear GP, an accelerator pedal APS, a brake pedal BPS, a battery management system BMS and a drive auxiliary system, wherein the drive auxiliary system can comprise an ASR, an EPB, an ABS and an ESP, whether the condition that the vehicle enters the constant-speed cruise mode is met or not is judged, if the condition is met, pure electric vehicle constant-speed cruise control is carried out on the basis, and finally the constant-speed cruise function is realized.
According to another aspect of the invention, the embodiment of the invention also provides an automobile, which comprises the constant-speed cruise control system.
The automobile of the embodiment of the invention realizes the acquisition of four button signals of 'constant speed cruise function on/off', 'cruise speed setting (increasing/decreasing)' and 'constant speed cruise temporarily quit' through one path of the A/D port of the motor controller by the acquisition circuit of the operation panel of the constant speed cruise, thereby saving interface resources; after filtering and removing the jitter of the signal, the operation information of the driver on the constant-speed cruise panel key in the normal operation mode is obtained through judging the voltage interval of the signal, so that a solid foundation is laid for realizing the constant-speed cruise function. In addition, the embodiment of the invention can also respectively provide different processing methods according to different abnormal conditions, remind the driver in the modes of an instrument indicating lamp, a text prompt and a prompt tone, and provide guarantee for driving safety in the mode of controlling the enabling of the constant speed cruise function. The controller 1 provided by the embodiment of the invention performs corresponding operation on abnormal conditions, thereby protecting the driving feeling.
To sum up, in the embodiment of the present invention, by setting the plurality of voltage dividing elements connected in series in sequence and the switch elements connected in parallel with different voltage dividing elements, the controller 1 can determine the user operation according to the voltage value at the voltage acquisition point when the user presses the function button and the corresponding switch element is closed, thereby acquiring various control signals through one controller 1 interface, and saving interface resources of the controller 1.
Furthermore, the present invention may repeat reference numerals and/or letters in the various examples. This repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed.
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.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (12)
1. A constant-speed cruising signal acquisition circuit is characterized by comprising:
a power supply;
the first voltage division element, the second voltage division element, the third voltage division element, the fourth voltage division element, the fifth voltage division element and the sixth voltage division element are sequentially connected in series, wherein the sixth voltage division element is grounded;
a first switching element connected in parallel to both ends of the second voltage dividing element and the third voltage dividing element arranged in series;
the second switching element is connected in parallel to two ends of the fourth voltage division element and the fifth voltage division element which are arranged in series;
a third switching element connected in parallel to both ends of the third voltage dividing element and the fourth voltage dividing element arranged in series;
a fourth switching element connected in parallel across the third voltage dividing element, the fourth voltage dividing element and the fifth voltage dividing element arranged in series;
a voltage collection point disposed between the first voltage dividing element and the second voltage dividing element; and the number of the first and second groups,
the controller is connected to the voltage acquisition point and is used for acquiring a voltage value at the voltage acquisition point and executing a preset operation instruction matched with the voltage value;
the first voltage dividing element, the second voltage dividing element, the third voltage dividing element, the fourth voltage dividing element, the fifth voltage dividing element and the sixth voltage dividing element are resistors with different resistance values;
the voltage value corresponds to a plurality of preset voltage intervals, each preset voltage interval corresponds to a preset operation instruction, and each preset voltage interval comprises:
a second preset voltage interval, wherein the preset operation instruction corresponding to the second preset voltage interval comprises: controlling to enter a constant-speed cruise mode or exit the constant-speed cruise mode;
a third preset voltage interval, wherein the preset operation instruction corresponding to the third preset voltage interval comprises: controlling the speed of the current constant-speed cruise to increase by a first preset value;
a fourth preset voltage interval, wherein the preset operation instruction corresponding to the fourth preset voltage interval comprises: controlling the current constant-speed cruise speed to reduce by a second preset value;
a fifth preset voltage interval, wherein the preset operation instruction corresponding to the fifth preset voltage interval is as follows: and controlling to enter the constant-speed cruise mode, and controlling the constant-speed cruise vehicle speed to be the constant-speed cruise vehicle speed when the vehicle is last exited or controlling the vehicle to exit the constant-speed cruise mode currently.
2. The cruise control signal acquisition circuit according to claim 1, wherein the controller is connected to the voltage acquisition point through a filter circuit;
wherein the filter circuit comprises:
a seventh voltage dividing element;
and the capacitor is connected with the seventh voltage division element in series and is grounded.
3. The constant-speed-cruise signal acquisition circuit according to claim 2, wherein the seventh voltage-dividing element is a resistor, and a resistance value of the seventh voltage-dividing element is greater than any one of the first voltage-dividing element, the second voltage-dividing element, the third voltage-dividing element, the fourth voltage-dividing element, the fifth voltage-dividing element, and the sixth voltage-dividing element.
4. The constant-speed-cruise-signal acquisition circuit according to any one of claims 1 to 3, wherein the controller comprises:
the acquisition module is used for acquiring a voltage value at a voltage acquisition point;
the matching module is used for determining preset voltage intervals in which the voltage values are positioned according to the voltage values, wherein each preset voltage interval corresponds to a preset operation instruction;
and the execution module is used for executing a preset operation instruction corresponding to the preset voltage interval determined by the matching module according to the preset voltage interval determined by the matching module.
5. The circuit of claim 4, wherein the acquisition module comprises:
the acquisition unit is used for continuously acquiring the actual voltage value at the voltage acquisition point within a preset time period;
the first acquisition unit is used for acquiring an average voltage value in the preset time period according to the acquired actual voltage value;
and the second acquisition unit is used for acquiring the voltage value at the voltage acquisition point according to the average voltage value.
6. The circuit for acquiring signals at constant speed according to claim 1, wherein the preset voltage interval comprises:
the cruise control circuit comprises a first preset voltage interval, a second preset voltage interval and a third preset voltage interval, wherein the first preset voltage interval represents that the current cruise control signal acquisition circuit is in a normal working state, and a theoretical voltage value at a voltage acquisition point is located in the first preset voltage interval under the condition that the first switch element, the second switch element, the third switch element and the fourth switch element are all disconnected;
when the first switching element is closed and the second switching element, the third switching element and the fourth switching element are all opened, the theoretical voltage value at the voltage acquisition point is within the second preset voltage interval;
when the second switching element is closed and the first switching element, the third switching element and the fourth switching element are all opened, the theoretical voltage value at the voltage acquisition point is within the third preset voltage interval;
when the third switching element is closed and the first switching element, the second switching element and the fourth switching element are all opened, the theoretical voltage value at the voltage acquisition point is within the fourth preset voltage interval;
and under the condition that the fourth switching element is closed and the first switching element, the second switching element and the third switching element are all opened, the theoretical voltage value at the voltage acquisition point is positioned in the fifth preset voltage interval.
7. The circuit of claim 4, wherein the predetermined voltage interval comprises:
a sixth preset voltage interval, wherein the preset operation instruction corresponding to the sixth preset voltage interval includes: controlling to send out first early warning information, wherein the theoretical voltage value at the voltage acquisition point is located in a sixth preset voltage interval under the condition that the first switch element and the third switch element are both closed and the second switch element and the fourth switch element are both opened;
a seventh preset voltage interval, wherein the preset operation instruction corresponding to the seventh preset voltage interval includes: controlling to send out second early warning information, wherein the first switch element and the second switch element are both closed, and under the condition that the third switch element and the fourth switch element are both opened, the theoretical voltage value at the voltage acquisition point is located in the seventh preset voltage interval;
an eighth preset voltage interval, wherein the preset operation instruction corresponding to the eighth preset voltage interval includes: controlling to send out third early warning information, wherein the first switch element and the fourth switch element are both closed, and under the condition that the second switch element and the third switch element are both opened, the theoretical voltage value at the voltage acquisition point is located in the eighth preset voltage interval;
a ninth preset voltage interval, wherein the preset operation instruction corresponding to the ninth preset voltage interval includes: and controlling to send out fourth early warning information, wherein the second switching element and the third switching element are both closed, and under the condition that the first switching element and the fourth switching element are both opened, the theoretical voltage value at the voltage acquisition point is located in the ninth preset voltage interval.
8. The circuit for acquiring signals during cruising at a constant speed according to claim 7, wherein the preset operation commands corresponding to the sixth preset voltage interval, the seventh preset voltage interval, the eighth preset voltage interval and the ninth preset voltage interval further include:
controlling and detecting the current working state, and controlling the vehicle to prohibit from entering the constant-speed cruise mode when the vehicle is not in the constant-speed cruise mode currently; and when the vehicle is currently in the constant-speed cruise mode, controlling the vehicle to exit the constant-speed cruise mode.
9. The cruise control signal acquisition circuit according to claim 7, wherein said controller further comprises:
and the first early warning module is used for controlling to send out fifth early warning information when the voltage value is not in any one of a first preset voltage interval, a second preset voltage interval, a third preset voltage interval, a fourth preset voltage interval, a fifth preset voltage interval, a sixth preset voltage interval, a seventh preset voltage interval, an eighth preset voltage interval and a ninth preset voltage interval, and the duration time is longer than a preset time threshold.
10. The cruise control signal acquisition circuit according to claim 4, wherein said controller further comprises:
and the second early warning module is used for controlling to send out sixth early warning information when the voltage value is greater than the first preset voltage value or less than the second preset voltage value.
11. A cruise control system comprising a cruise signal acquisition circuit as claimed in any one of claims 1 to 10.
12. An automobile, characterized in that it comprises a cruise control system according to claim 11.
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