Control device with heating function

Abstract

The utility model relates to a control device with a heating function, which comprises a first shell part and a second shell part, the first shell part and the second shell part form an accommodating space, a first control component is arranged in the accommodating space, a second control component is also arranged in the accommodating space, and the first control component is connected with the second control component. The second control part comprises a temperature comparison circuit and a heating device, and the temperature comparison circuit is electrically connected to the heating device. The utility model provides the control device with the heating function, which can automatically judge whether the control part needs to be heated or not according to the temperature, so that the control device can better work in a low-temperature environment.

Description

Technical Field

[0001] The utility model belongs to the technical field of automobiles, and in particular relates to a control device with a heating function. Background Art

[0002] With the development of automobile technology, the degree of automation and intelligence of automobiles is getting higher and higher. For this reason, many parts of the car have begun to operate automatically. Take the transmission as an example. It is equipped with a transmission controller to control the operation of the transmission. However, although the current transmission controller will undergo low temperature testing, it may still fail to work properly when facing ultra-low temperatures due to the low temperature. Utility Model Content

[0003] The utility model aims to provide a control device with a heating function, which can realize automatic heating at ultra-low temperatures, thereby improving the use range of the control device and preventing the control device from being unable to work due to ultra-low temperatures.

[0004] For this reason, the utility model proposes the following scheme.

[0005] A control device with a heating function comprises a first shell part and a second shell part, wherein the first shell part and the second shell part form a receiving space, and a first control component is arranged in the receiving space.

[0006] A second control component is also arranged in the accommodating space. The second control component includes a temperature comparison circuit and a heating device. The temperature comparison circuit is electrically connected to the heating device.

[0007] According to one aspect of the utility model, a switch circuit is further provided between the temperature comparison circuit and the heating device.

[0008] According to one aspect of the utility model, the switch circuit has a metal oxide field effect semiconductor transistor.

[0009] According to one aspect of the utility model, the temperature comparison circuit includes a comparator and a negative temperature coefficient thermistor and at least one other resistor, one end of the negative temperature coefficient thermistor is connected to the power-on signal input end, and the other end is connected to the reverse end of the comparator, and the output end of the comparator is connected to the heating device through a switching circuit.

[0010] According to one aspect of the utility model, the additional resistor includes a first resistor and a second resistor, wherein one end of the first resistor is connected to the power-on signal input terminal and the other end is connected to the same direction terminal of the comparator, and one end of the second resistor is connected to the electrical signal input terminal and the other end is connected to the output terminal of the comparator.

[0011] According to one aspect of the present invention, the additional resistor comprises a third resistor, wherein one end of the third resistor is connected to the same-direction end of the comparator, and the other end of the third resistor is connected to the output end of the comparator.

[0012] According to one aspect of the utility model, the temperature comparison circuit enables the heating device to operate when the temperature is less than a first preset value.

[0013] According to one aspect of the utility model, a first thermally conductive adhesive is arranged between the first control component and the first shell part, and the first control component is in contact with the first thermally conductive adhesive. A second thermally conductive adhesive is arranged between the second control component and the second shell part, and the second control component is in contact with the second thermally conductive adhesive.

[0014] According to one aspect of the utility model, a sealing member is provided between the first shell part and the second shell part.

[0015] According to one aspect of the utility model, an air pressure balancing device is provided on the first shell part or the second shell part.

[0016] It can be seen from the above scheme that the utility model proposes a control device with a heating function, which can automatically determine whether the control component needs to be heated according to the temperature, so that the control device can work better in a low temperature environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Exemplary embodiments of the present invention are described with reference to the accompanying drawings, in which:

[0018] Figure 1 The figure shows an exploded schematic diagram of the control device of the present utility model.

[0019] Figure 2 A three-dimensional schematic diagram of the upper shell of the control device of the utility model is shown.

[0020] Figure 3 A detailed view showing the first control component mounted on the upper housing.

[0021] Figure 4 A detailed view showing the second control component mounted on the upper housing.

[0022] Figure 5 A detailed view of the lower housing is shown.

[0023] Figure 6 A schematic diagram of a second control component is shown.

[0024] Figure 7 A schematic diagram of an improved embodiment of the second control component is shown.

[0025] Figure 8 A schematic diagram showing yet another improved embodiment of the second control component is shown.

[0026] Fig. 9 A schematic diagram showing yet another improved embodiment of the second control component is shown. DETAILED DESCRIPTION

[0027] Embodiments of the present invention are described below with reference to the accompanying drawings. In the following description, many specific details are set forth so that those skilled in the art can more fully understand and implement the present invention. However, it is obvious to those skilled in the art that the implementation of the present invention may not have some of these specific details. In addition, it should be understood that the present invention is not limited to the specific embodiments described. On the contrary, any combination of the features and elements described below may be considered to implement the present invention, regardless of whether they relate to different embodiments. Therefore, the following aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as features or limitations of the claims unless clearly stated in the claims.

[0028] In the following description, the descriptions about directions, such as "upper", "lower", "inner", "outer", "radial", "axial", etc., which may be used, are only for the convenience of description, unless otherwise specified, and are not intended to form any limitation on the technical solution of the utility model. In addition, in the following description, terms such as "first", "second", etc. are used to describe the elements of the present application, and these terms are only used to distinguish the elements, and are not intended to limit the nature, sequence, order or number of these elements.

[0029] Figure 1 FIG. 2 shows an exploded schematic diagram of the control device of the present utility model. Figure 1 As shown, the control device of the present invention includes an upper shell 1 preferably made of cast aluminum alloy material and a lower shell 9 preferably made of cast aluminum alloy material. The upper shell 1 and the lower shell 9 can be detachably fixed together to form a accommodating space therebetween to accommodate other components.

[0030] The upper housing 1 has a first portion disposed on a first plane, and a plurality of holes are provided on the first portion for the connection member 10 to pass through, so as to be connected to the lower housing 9. The upper housing 1 also includes a second portion located on one side of the first plane, and the second portion is generally in a basin shape. Thus, the second portion forms at least a portion of the accommodation space described above. Preferably, a plurality of heat dissipation structures, such as heat dissipation ribs or heat dissipation ribs, are also provided on the outer side surface of the second portion of the upper housing 1.

[0031] Figure 2 The figure shows a three-dimensional schematic diagram of the upper shell of the control device of the utility model. Figure 2It can be seen that a gas pressure balance component mounting portion 12 is also provided on the second portion of the upper shell 1. The gas pressure balance component mounting portion 12 is provided in the form of a hole and can be sealed with a vent plug 2 which is preferably connected in a snap-on manner. The vent plug 2 is installed in the hole by pressing. By providing the vent plug 2, when the atmospheric temperature rises or falls, the pressure difference inside and outside the accommodation space can be balanced, thereby preventing the atmosphere from entering or overflowing the accommodation space under the action of the pressure difference, squeezing the sealing element and causing the sealing failure.

[0032] A label 3 is provided on the outer surface of the upper housing 1 located on the second part, and relevant information about the control device can be printed on the label 3. The label 3 can be provided on the second part by pasting.

[0033] See also Figure 2 At least a portion of the first portion of the upper shell 1 is provided with a plate-like structure 13 extending to the other side opposite to the second portion, for guiding liquids such as rainwater to prevent liquids from entering the accommodation space through the shell gap. The plate-like structure 13 may extend perpendicularly to the first portion.

[0034] The upper shell 1 can be made of aluminum alloy, for example, can be made by stamping.

[0035] return Figure 1 The lower shell 9 is generally plate-shaped, and a plurality of holes are provided at corresponding positions of its periphery for connection with the connecting member 10, so that the upper shell 1 and the lower shell 9 are detachably fixedly connected through the connecting member 2. The connecting member 2 can be a screw, and an internal thread matching the external thread of the screw is provided in the hole of the lower shell 9. Alternatively, the connecting member 2 can also be a self-tapping screw, and the internal thread does not need to be processed in advance in the hole of the lower shell 9. In addition, the connecting member 2 can also be a bolt and nut, thereby also not needing to process the internal thread in advance in the hole of the lower shell 9.

[0036] The lower housing 9 may be made of aluminum alloy, for example, formed by aluminum alloy casting.

[0037] The above-mentioned vent plug 4 can also be installed on the lower shell 9. Alternatively, the vent plug 4 is respectively provided on the upper shell 1 and the lower shell 9. In addition, other types of vent plugs other than the snap-on vent plug can also be used, or a vent membrane can be used.

[0038] Furthermore, heat dissipation fins or heat dissipation ribs may be provided on the outer surface of the lower housing 9 to improve the heat dissipation of the control device.

[0039] In addition, the lower shell 9 can also be configured as a basin-shaped structure to form a receiving space together with the second portion of the upper shell 1. Alternatively, the upper shell 1 is formed into a plate-shaped structure, and the lower shell 9 is formed into a basin-shaped structure, as long as a receiving space can be formed between the two.

[0040] See also Figure 1 A first control component 6 is arranged in the accommodating space. Figure 3 A detailed view showing the first control component mounted on the upper housing. Figure 3 The first control component 6 includes a circuit board 62, on which a circuit is formed by printing or other methods, and various electronic components required to realize the control function are arranged on the circuit board by surface mounting technology or plug-in method. Here, the circuit board 62 is also called a PCBA board.

[0041] In order to ensure the connection between the circuit board 62 and the outside, a plug connector 61 is also provided. The plug connector 61 and the circuit board 62 are welded together, thereby achieving advantages such as high integration, compact structure, small space occupation, and stronger connection between the connector and the circuit board.

[0042] A fixing structure connection hole 621 is provided on the circuit board 62, and the fixing structure connection hole 621 cooperates with the fixing structure on the upper housing 1, so that the circuit board 62 can be fixed on the upper housing 1, thereby protecting the electrical parts and reducing vibration impact. The fixing structure can adopt a cylindrical pin or other structure.

[0043] See also Figure 1 A second control component 7 is arranged in the accommodating space. Figure 4 A detailed view showing the second control component mounted on the upper housing. Figure 4 The second control component 7 includes a heating circuit board 71, on which a circuit is formed by printing or other means, and on which various electronic components required for realizing the control function are arranged by surface mounting technology or plug-in means. Here, the heating circuit board 71 is also referred to as a heating PCBA board.

[0044] A spring copper sheet 72 is also provided on the heating PCBA board, and the two are welded together, with a compact structure and reliable connection. The heating PCBA board is connected to the PCBA board through the spring copper sheet 72, and the current is transmitted from the PCBA board to the heating PCBA board through the spring copper sheet. The spring copper sheet can realize the rapid assembly between the PCBA board and the heating PCBA board, improve the production cycle, and save costs.

[0045] In addition, a fixing structure connection hole 721 is provided on the heating circuit board 71, and the fixing structure connection hole 721 cooperates with the fixing structure on the lower shell 9, so that the heating circuit board 71 can be fixed on the lower shell 9, thereby protecting the electrical parts and reducing vibration impact. The fixing structure can adopt a cylindrical pin or other structure.

[0046] Figure 5A detailed view of the lower housing 9 is shown. The lower housing 9 has a recessed portion 93. In order to further improve the heat dissipation performance, a lower housing thermal conductive adhesive 8 is also provided. The thermal conductive adhesive 8 is applied to the inner cavity portion 93 of the lower housing, and the thermal conductive adhesive 8 is in full contact with the lower housing 9 and the PCBA to transfer heat to the housing quickly and efficiently.

[0047] Correspondingly, an upper shell thermal conductive adhesive 4 may also be provided between the upper shell 1 and the PCBA to dissipate the heat.

[0048] Since the control components should be protected from water and dust, a good seal needs to be formed between the upper shell 1 and the lower shell 9. Figure 1 , a sealant 5 is provided. Specifically, see Figure 2 , an upper shell rubber channel 11 is provided at a position on the upper shell 1 that cooperates with the plug connector 61, see Figure 3 , a glue path 611 is provided at the corresponding position of the plug connector 61, and the sealant is continuously applied along the glue path 11 of the upper shell and the glue path 611 on the connector 61, so that the sealant completely fills the entire glue path. Figure 4 On the inner surface of the lower shell 9, a protruding glue extrusion structure 91 is provided at a position corresponding to the glue path 11 of the upper shell, so as to cooperate with the glue path 11 of the upper shell to ensure that the glue fills the glue path without any gaps. The sealant 5 can form a seal between the control component 6 and the upper shell 1 and the lower shell 9, thereby preventing water or dust from contacting the control circuit or electronic components.

[0049] As an important improvement of the present invention, the second control component 7 can realize automatic heating according to the temperature, thereby heating the first control component 6 to enable it to work normally.

[0050] Figure 6 2 shows a schematic diagram of the second control component. Specifically, the second control component includes a low-temperature automatic heating control circuit. Figure 6 As shown, the control circuit includes a temperature comparison circuit and a switch circuit, wherein the temperature comparison circuit includes multiple resistors, and the multiple resistors include a negative temperature coefficient thermistor NTC, which is used to monitor the change of ambient temperature and convert the temperature signal into a resistance signal, which is then converted into a voltage signal, and then the voltage signal is compared. The switch circuit is connected to the output end of the temperature comparison circuit, and the output end of the temperature comparison circuit serves as the input end of the switch circuit, and the output end of the switch circuit is connected to the heating circuit board 71, so as to control the conduction and shutdown of the heating circuit board 71.

[0051] As a preferred embodiment, the temperature comparison circuit includes a comparator and a negative temperature coefficient thermistor and at least one other resistor, wherein one end of the negative temperature coefficient thermistor is connected to the power-on signal input terminal, one end is connected to the reverse end of the comparator, and the output of the comparator is connected to the heating device through a switch circuit. The other resistor includes a first resistor and a second resistor, wherein one end of the first resistor is connected to the power-on signal input terminal, one end is connected to the same direction end of the comparator, one end of the second resistor is connected to the electric signal input terminal, and one end is connected to the output of the comparator. The other resistor includes a third resistor, one end of the third resistor is connected to the same direction end of the comparator, and one end is connected to the output of the comparator. The other resistor also includes a fourth resistor and a fifth resistor, both of which are grounded at one end. The other end of the fourth resistor is connected to the NTC and the reverse end of the comparator, and the other end of the fifth resistor is connected to the first segment group and the same direction segment of the comparator. By setting different resistance values, the temperature comparison circuit can have a hysteresis characteristic.

[0052] Specifically, the required temperature thresholds can be pre-set, such as the start-up heating temperature value T1 and the shut-down heating temperature value T2, so that when the temperature is lower than the temperature value T1, the controller starts heating, and when the heating temperature rises to T2, the controller shuts down heating. The start-up heating temperature value T1 can be set to, for example, -40°C, and the shut-down heating temperature value T2 can be set to, for example, -38°C.

[0053] Therefore, after the driver turns on the ignition key, if the temperature is higher than the set value T1, the controller starts immediately; if the temperature is lower than the set value T1, it will heat for a certain period of time and then start after the temperature is greater than T2.

[0054] For the temperature comparison circuit, a reference voltage is given at the same-direction end of the comparator, and the NTC at the reverse end is divided by a resistor. The resistance of the NTC changes with temperature, so the voltage at the reverse end changes with temperature, and the output high and low levels change at the threshold, realizing the temperature control automatic heating function.

[0055] Figure 7The schematic diagram of an improved embodiment of the second control component is shown. In order to avoid the situation where the vehicle is not started but still automatically triggers low-temperature heating, so as to reduce unnecessary battery power loss, and at the same time to meet the condition that the controller can only be started normally when the ambient temperature of the controller is greater than -40°C (since the minimum operating ambient temperature of most chips is -40°C, to avoid possible functional abnormalities after the controller is powered on when the temperature is lower than -40°C), the automatic temperature control circuit introduces the vehicle key power-on signal and uses it as a necessary input condition for the temperature control circuit. When there is no key power-on signal, the temperature comparison circuit has no power input and cannot turn on the switch circuit, that is, the heating cannot be started. So far, the low-temperature heating logic of the entire controller is: after the key is powered on, the temperature circuit detects the ambient temperature. If the temperature is greater than T1, the controller starts normally and does not trigger heating; if the temperature is less than T1, the controller does not start and automatically triggers heating. When the heating ambient temperature is greater than T2, the controller starts normally and the temperature control circuit stops heating.

[0056] Figure 8 The schematic diagram of another improved embodiment of the second control component is shown. In order to increase the stability of the entire temperature control circuit and add a diagnostic function to it, when the controller is normally started and the temperature is greater than T2, the main control chip MCU forcibly turns off the heating function to avoid the abnormal situation that the controller keeps heating and cannot turn off the heating in case the temperature control automatic heating circuit fails.

[0057] Fig. 9 The schematic diagram of another improved embodiment of the second control component is shown. In order to further enhance the stability of the controller and to avoid the situation where the key power-on signal cannot normally start the controller in case of an abnormality or failure of the temperature control circuit, an emergency key power-on signal is added. When the above situation occurs, the emergency key power-on signal can force the controller to start.

[0058] The installation steps of the control device of the utility model include:

[0059] Apply the sealant 5 and the upper shell heat-conducting adhesive 4 to the upper shell 1, and then install the first control component 6 to the upper shell 1;

[0060] Apply the lower shell thermal conductive glue 8 to the lower shell 9, and then install the second control component 7 to the lower shell 9;

[0061] Install the lower housing with the heat-conducting glue and the second control component 7 onto the upper housing with the heat-conducting glue and the first control component 6, and fasten the two with screws;

[0062] The vent plug 2 and the label 3 are mounted on the upper shell 1 .

[0063] During operation, the heat generating part of the PCBA board is connected to the upper shell by means of thermal conductive adhesive. The chip and electrical components of the PCBA board emit a large amount of heat, which is transferred to the upper shell 1 through the thermal conductive adhesive and then dissipated through the heat dissipation rib structure of the upper shell.

[0064] The heating PCB board is attached to the lower shell 9 by thermal conductive adhesive. When the controller is started, the sensor detects that the temperature is lower than -40°C, and starts heating the PCBA board in coordination with the heating software logic and the heating module circuit. The thermal conductive adhesive is spread flat on the lower part of the heating PCBA board, which can quickly transfer the heat to the shell, and then transfer it to the PCBA board through the shell. This indirect heating method can achieve low-temperature heating more safely.

[0065] The above description is merely an exemplary embodiment of the spirit and principle of the present invention. It will be appreciated by those skilled in the art that various changes may be made to the described examples without departing from the spirit and principle, and these changes and their various equivalents are anticipated by the applicant and fall within the scope defined by the claims of the present invention.

Claims

1. A control device with a heating function, comprising a first shell portion and a second shell portion, wherein the first shell portion and the second shell portion form a receiving space, and a first control component is arranged in the receiving space. It is characterized in that A second control component is also arranged in the accommodating space. The second control component includes a temperature comparison circuit and a heating device. The temperature comparison circuit is electrically connected to the heating device.

2. The control device with heating function according to claim 1, characterized in that: A switch circuit is also provided between the temperature comparison circuit and the heating device.

3. The control device with heating function according to claim 2, characterized in that: The switch circuit has a metal oxide field effect semiconductor transistor.

4. The control device with heating function according to any one of claims 1 to 3, characterized in that: The temperature comparison circuit includes a comparator, a negative temperature coefficient thermistor and at least one other resistor, one end of the negative temperature coefficient thermistor is connected to the power-on signal input end, and the other end is connected to the reverse end of the comparator, and the output end of the comparator is connected to the heating device through a switching circuit.

5. The control device with heating function according to claim 4, characterized in that: The other resistor includes a first resistor and a second resistor, wherein one end of the first resistor is connected to the power-on signal input terminal and the other end is connected to the same direction terminal of the comparator, and one end of the second resistor is connected to the electrical signal input terminal and the other end is connected to the output terminal of the comparator.

6. The control device with heating function according to claim 5, characterized in that: The additional resistor comprises a third resistor, wherein one end of the third resistor is connected to the non-inverting terminal of the comparator, and the other end of the third resistor is connected to the output terminal of the comparator.

7. The control device with heating function according to claim 6, characterized in that: The temperature comparison circuit enables the heating device to operate when the temperature is less than a first preset value.

8. The control device with heating function according to any one of claims 1-3 and 5-7, characterized in that: A first thermally conductive adhesive is disposed between the first control component and the first shell portion, and the first control component is in contact with the first thermally conductive adhesive. A second thermally conductive adhesive is disposed between the second control component and the second shell portion, and the second control component is in contact with the second thermally conductive adhesive.

9. The control device with heating function according to any one of claims 1-3 and 5-7, characterized in that: A seal is disposed between the first housing portion and the second housing portion.

10. The control device with heating function according to any one of claims 1-3 and 5-7, characterized in that: An air pressure balancing device is provided on the first shell part or the second shell part.

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