CN217892801U - Manual unit control circuit of commercial car EPB - Google Patents
Manual unit control circuit of commercial car EPB Download PDFInfo
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- CN217892801U CN217892801U CN202123406163.4U CN202123406163U CN217892801U CN 217892801 U CN217892801 U CN 217892801U CN 202123406163 U CN202123406163 U CN 202123406163U CN 217892801 U CN217892801 U CN 217892801U
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Abstract
The utility model relates to the field of electronic parking brake systems, and discloses a control circuit of an EPB manual control unit of a commercial vehicle, wherein a power supply module is used for converting a power supply of the whole vehicle into a 5V power supply and is used as a power supply of an internal indicator lamp driving module; the MCU and the switch acquisition module are connected with signals transmitted by the acquisition switch acquisition module and transmit the signals to a finished automobile CAN system through a CAN bus; the MCU is connected with the indicator lamp driving module and controls the action of the indicator lamp driving module according to a signal for controlling the indicator lamp input by the EPB system; switch collection module is connected with MCU through gathering mouthful with AD, 4 from reset switch of discernment are gathered simultaneously to an AD collection mouth, realize AD converter's make full use of, practice thrift MCU's resource, thereby can use the MCU of little encapsulation, other resistance capacitance use quantity also corresponding reduction simultaneously, can practice thrift commercial car EPB manual control unit's PCB cloth board space like this, be favorable to commercial car EPB manual control unit to do littleer.
Description
Technical Field
The utility model belongs to the technical field of vehicle electron parking, concretely relates to manual unit control circuit of commercial car EPB.
Background
The electronic parking system is basically popularized in application to passenger cars, achieves parking braking of the cars in an electronic control mode, replaces a traditional mechanical hand brake mode to achieve parking and braking, and enables the braking of the cars to be more accurate and stable. However, its EPB switch (also called EPB manual control unit or EPB HCU) is available, and there is a market in the commercial vehicle market at present.
Chinese patent cn201920173924.X discloses a control switch circuit for an EPB of an electronic parking system of an automobile, as shown in fig. 1. It has the following disadvantages:
defect 1: the wiring harness and connectors are cost prohibitive. As shown in the above figures, 8 wires are required for connection of the ECU to the SWITCH (EPB SWITCH), at least one 8-pin connector and corresponding sheath are required at the ECU end, and at least one 10-pin connector and corresponding sheath are required at the SWITCH end of the power cord.
Defect 2: some of the tests required by the main plant failed. If a host factory generally requires that the port of the external connector of a product passes through environmental conditions and test part 2 of GB/T28046.2-2011 road vehicle electrical and electronic equipment: and (4) testing the short-circuit protection of the signal line to the power supply in the electrical load. In the circuit shown in the figure, the port 1 controls the triode Q1 to be opened at the enable pin CTR1 of the ECU, and the EPB action indicator lamp D2 is in a bright state, so that the Q1 can be damaged during a 12V short-circuit test of the power supply of the whole vehicle.
Defect 3: and the ECU controls the EPB switch or occupies too much port resources of a main chip in the ECU when acquiring an EPB switch signal. The collection and control of the EPB switch signals occupy the port resources of the main chip in the 9-way ECU.
Defect 4: the backlight is not controllable. The backlight is always on after the system is powered on and is not controlled.
Defect 5: the backlight brightness and the indicator brightness vary greatly. For a 12V system, the voltage fluctuation range is generally 8V-16V, and the brightness change is large when the system power supply is at 8V and the system power supply is at 16V. If the system is applied to 24V, the corresponding current limiting resistor must be changed.
SUMMERY OF THE UTILITY MODEL
The utility model discloses according to above technical problem, provide following solution.
In order to solve the technical problem, the utility model discloses a following technical scheme can solve:
a control circuit of an EPB manual control unit of a commercial vehicle comprises an MCU, an indicator light driving module, a CAN bus module, a power supply module and a switch acquisition module;
the power supply module is used for converting a power supply of the whole vehicle into a 5V power supply and is used as a power supply of the internal indicator lamp driving module;
the MCU and the switch acquisition module are connected with signals transmitted by the acquisition switch acquisition module and transmit the signals to a finished automobile CAN system through a CAN bus; the MCU is connected with the indicator light driving module and controls the action of the indicator light driving module according to a signal which is input by the EPB system and used for controlling the indicator light;
the switch acquisition module is connected with the MCU through an AD acquisition port and comprises resistors R10, R11, R12, R13 and R14, self-reset switches K1, K2, K3, K4 and a capacitor C10, wherein one end of the resistor R10 is connected with +5V of an MCU working power supply, the other end of the resistor R10 is connected with one end of the capacitor C10, one end of the resistor R11 and the AD acquisition port AD1 of the MCU, the other end of the capacitor C10 is grounded, the other end of the resistor R11 is connected with one end of the self-reset switch K1 and one end of the resistor R12, the other end of the self-reset switch K1 is grounded, the other end of the resistor R12 is connected with one end of the self-reset switch K2 and one end of the resistor R13, the other end of the self-reset switch K3 is connected with one end of the self-reset switch K4, and the other end of the self-reset switch K4 is grounded.
Preferably, K1 is defined as a parking switch, K2 is defined as a parking release switch, K3 is defined as an auto hold switch, and K4 is defined as a backlight switch.
Preferably, when the short circuit of the K4 fails, the output voltage signal is not changed when the K1 or the K2 is independently switched on.
Preferably, when the short circuit of K3 fails, the output voltage signal is not changed when K1 or K2 is independently switched on.
Preferably, the switch acquisition module is connected with the power module.
Preferably, the MCU is connected with the CAN bus module.
Preferably, the indicator light driving module includes a backlight module, a manual parking light module, and an automatic parking light module.
The utility model discloses gather the mouth according to an AD and gather 4 simultaneously from reset switch discernments, realize AD converter's make full use of, practice thrift MCU's resource to can use the MCU of little encapsulation, other resistance capacitance use also corresponding reduction of quantity simultaneously, can practice thrift commercial car EPB manual control unit's PCB cloth board space like this, it is littleer to be favorable to commercial car EPB manual control unit to do. And when the backlight is short-circuited or the auto short-circuited, the main functions of the hand control unit are not affected.
Drawings
Fig. 1 is a circuit diagram of the related art.
Fig. 2 is a control circuit diagram of embodiment 1.
Fig. 3 is a control logic diagram of embodiment 1.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Example 1
A control circuit of an EPB manual control unit of a commercial vehicle comprises an MCU, an indicator light driving module, a CAN bus module, a power supply module and a switch acquisition module; in the scheme, the EPB manual control unit of the commercial vehicle only needs to be externally connected with 4 wires, namely a power line, a ground wire, a CAN _ H line and a CAN _ L line of the whole vehicle.
The power supply module is used for converting a power supply of the whole vehicle into a 5V power supply and is used as a power supply of the internal indicator lamp driving module; therefore, the backlight brightness and the indicator lamp brightness can be unchanged when the power supply is normal no matter on a 12V electric system whole vehicle or a 24V electric system whole vehicle. The vehicle can be universally used on a whole vehicle with a 12V electric system and a whole vehicle with a 24V electric system.
The function of the EPB manual control unit of the commercial vehicle in the scheme comprises the following aspects:
the method comprises the following main functions: the states of the parking switch and the release switch are correctly identified and are sent to a whole vehicle CAN system through a CAN bus for an EPB system or other systems; accept EPB system function pilot lamp control command through the CAN bus, the control function pilot lamp is lighted, is extinguished or glimmers, the function pilot lamp is manual parking pilot lamp and automatic parking pilot lamp.
Secondary functions: the state of the AutoHold switch is correctly identified and is sent to a whole vehicle CAN system through a CAN bus for use by an EPB system or other systems; and the internal faults of the EPB manual control unit of the commercial vehicle which CAN be identified are correctly identified and are sent to a CAN system of the whole vehicle through a CAN bus.
Other functions are as follows: correctly identifying the state of a backlight switch and controlling the backlight of an EPB manual control unit of the commercial vehicle, or simultaneously sending the state to a CAN system of the whole vehicle through a CAN bus for the use of the EPB system or other systems; receiving fault information of the EPB system and prompting by flashing all instructions of the EPB manual control unit of the commercial vehicle;
backlight control of the EPB manual control unit of the commercial vehicle: the backlight can be controlled by a backlight switch in a switch acquisition circuit of a commercial vehicle EPB manual control unit, when the backlight switch is invalid, the original state of the backlight is kept, when the backlight switch is valid, the backlight is turned off if the last state is on, and the backlight is turned on if the last state is off; the backlight of the EPB manual control unit of the commercial vehicle CAN be controlled by the input conversion of buttons of a whole vehicle instrument system or a vehicle body controller system under the control of the CAN bus.
The commercial vehicle EPB manual control unit controls the brightness of the indicator lamp: the indication lamp brightness instruction is from the CAN bus backlight brightness message and the function indication lamp brightness message, and after the MCU analyzes the backlight brightness message, the MCU outputs the PWM waveform through an IO _ P1.0 port according to the analyzed backlight brightness value to control. The intensity of the LED is controlled by using different duty ratios so as to adapt to the requirements of different vehicle cabs on brightness without changing hardware.
The MCU and the switch acquisition module are connected with the signal transmitted by the acquisition switch acquisition module and transmit the signal to a whole vehicle CAN system through a CAN bus; the MCU is connected with the indicator lamp driving module and controls the action of the indicator lamp driving module according to a signal for controlling the indicator lamp input by the EPB system;
the switch acquisition module in the embodiment is connected with the MCU through the AD acquisition port, and comprises resistors R10, R11, R12, R13 and R14, a self-reset switch K1, K2, K3, K4 and a capacitor C10, wherein one end of the resistor R10 is connected with +5V of an MCU working power supply, the other end of the resistor R10 is connected with one end of the capacitor C10, one end of the resistor R11 and the AD acquisition port AD1 of the MCU, the other end of the capacitor C10 is grounded, the other end of the resistor R11 is connected with one end of the self-reset switch K1 and one end of the resistor R12, the other end of the self-reset switch K1 is grounded, the other end of the resistor R12 is connected with one end of the self-reset switch K2 and one end of the resistor R13, the other end of the self-reset switch K2 is grounded, the other end of the self-reset switch K13 is connected with one end of the self-reset switch K3 and one end of the self-reset switch R14, the other end of the self-reset switch K3 is grounded. This scheme can effectively discern the multichannel from reset switch, can not effectual self-locking switch also can effectual discernment simultaneously to the multichannel, makes things convenient for follow-up MCU to carry out corresponding instruction and assigns.
In order to realize the functions, K1 is defined as a parking switch, K2 is defined as a parking release switch, K3 is an AutoHold switch, and K4 is defined as a backlight switch.
In order to intuitively understand the scheme, in the scheme, the resistor R10 is 20K omega, the resistor R11 is 10K omega, the resistor R12 is 10K omega, the resistor R13 is 10K omega, the resistor R14 is 20K omega, and the voltage of the MCU working power supply is 5V. The real-time voltage value acquired by the AD acquisition port AD1 is denoted by a symbol V1 a. The following control logic is present:
in the scheme, when the K4 short circuit fails and the K1 or the K2 is independently switched on, the output voltage signal is unchanged.
In the scheme, when the K3 short circuit fails and the K1 or the K2 is independently switched on, the output voltage signal is unchanged.
The method comprises the following specific steps:
the values of V1a for each switching state when K4 is shorted (no matter if K4 is pressed K4 normally on) and open (no matter if K4 is pressed K4 normally off) are as follows:
the values of V1a for each switching state when K3 is shorted (normally on whether K3 is pressed or not) and open (normally off whether K3 is pressed or not) are as follows:
when the K4 is failed in short circuit or open circuit, the realization of the main functions of the EPB cannot be influenced. When the K3 is failed in short circuit or open circuit, the realization of the EPB basic function is not influenced. Therefore, the EPB basic functions are defined on K1 and K2, the secondary functions are defined on K3, and other unimportant functions are defined on K4 in the design.
In this embodiment, the switch acquisition module is connected with the power module.
In this embodiment, the MCU is connected to the CAN bus module.
As described above: the indicator light driving module in the embodiment comprises a backlight module, a manual parking light module and an automatic parking light module.
The manual unit of this embodiment can gather simultaneously according to an AD and discern 4 from reset switch, realizes AD converter's make full use of, practices thrift MCU's resource to can use little encapsulated MCU, other resistance capacitance use quantity also correspondingly reduce simultaneously, can practice thrift commercial car EPB manual control unit's PCB cloth board space like this, be favorable to commercial car EPB manual control unit to do littleer. And when the backlight is short-circuited or the AUTOhold is short-circuited, the main functions of the hand control unit are not influenced.
Example 2
This embodiment is different from embodiment 1 in that: the power module is used for converting a power supply of the whole vehicle into a 12V power supply.
Example 3
This embodiment is different from embodiment 1 in that: the power module is used for converting the power supply of the whole vehicle into a 24V power supply.
Claims (9)
1. The utility model provides a manual unit control circuit of commercial car EPB which characterized in that: the device comprises an MCU, an indicator light driving module, a CAN bus module, a power supply module and a switch acquisition module;
the power supply module is used for converting a power supply of the whole vehicle into a 5V power supply and is used as a power supply of the internal indicator lamp driving module;
the MCU and the switch acquisition module are connected with the signal transmitted by the acquisition switch acquisition module and transmit the signal to a whole vehicle CAN system through a CAN bus; the MCU is connected with the indicator light driving module and controls the action of the indicator light driving module according to a signal which is input by the EPB system and used for controlling the indicator light;
the switch acquisition module is connected with the MCU through an AD acquisition port and comprises resistors R10, R11, R12, R13 and R14, self-reset switches K1, K2, K3, K4 and a capacitor C10, wherein one end of the resistor R10 is connected with +5V of an MCU working power supply, the other end of the resistor R10 is connected with one end of the capacitor C10, one end of the resistor R11 and the AD acquisition port AD1 of the MCU, the other end of the capacitor C10 is grounded, the other end of the resistor R11 is connected with one end of the self-reset switch K1 and one end of the resistor R12, the other end of the self-reset switch K1 is grounded, the other end of the resistor R12 is connected with one end of the self-reset switch K2 and one end of the resistor R13, the other end of the self-reset switch K3 is connected with one end of the self-reset switch K4, and the other end of the self-reset switch K4 is grounded.
2. The control circuit of EPB manual control unit of commercial vehicle of claim 1, wherein: defining K1 as a parking switch, K2 as a parking release switch, K3 as an AutoHold switch and K4 as a backlight switch.
3. The control circuit of EPB manual control unit of commercial vehicle according to claim 2, characterized in that: when the short circuit of the K4 fails, the output voltage signal is unchanged when the K1 or the K2 is independently switched on.
4. The EPB manual control unit control circuit of a commercial vehicle as claimed in claim 3, wherein: when the short circuit of the K3 fails, and the K1 or the K2 is independently switched on, the output voltage signal is not changed.
5. The control circuit of EPB manual control unit of commercial vehicle of claim 1, wherein: the switch acquisition module is connected with the power module.
6. The control circuit of EPB manual control unit of commercial vehicle of claim 1, wherein: the MCU is connected with the CAN bus module.
7. The control circuit of EPB manual control unit of commercial vehicle according to claim 2, characterized in that: the indicator light driving module comprises a backlight module, a manual parking light module and an automatic parking light module.
8. The control circuit of EPB manual control unit of commercial vehicle of claim 1, wherein: the power module is used for converting a vehicle power supply into a 12V power supply.
9. The control circuit of EPB manual control unit of commercial vehicle of claim 1, wherein: the power module is used for converting the power supply of the whole vehicle into a 24V power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123406163.4U CN217892801U (en) | 2021-12-30 | 2021-12-30 | Manual unit control circuit of commercial car EPB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123406163.4U CN217892801U (en) | 2021-12-30 | 2021-12-30 | Manual unit control circuit of commercial car EPB |
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| Publication Number | Publication Date |
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| CN217892801U true CN217892801U (en) | 2022-11-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123406163.4U Active CN217892801U (en) | 2021-12-30 | 2021-12-30 | Manual unit control circuit of commercial car EPB |
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- 2021-12-30 CN CN202123406163.4U patent/CN217892801U/en active Active
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