Electric heating rod temperature control system

Abstract

The utility model relates to the technical field of vehicle electric heating dryers, and discloses an electric heating rod temperature control system which comprises an electric heating rod and a temperature control module, a heating body and a temperature sensor are arranged in the electric heating rod, and a first heating wire and a second heating wire are led out of the heating body. A first temperature lead and a second temperature lead are led out from the temperature sensor, the second temperature lead and the second heating lead are short-circuited to form a common lead, and the first heating lead, the first temperature lead and the common lead extend to the outside of the electric heating rod and are connected with the temperature control module. According to the utility model, the number of lead-out wires of the heating rod is reduced, the design of a wire outlet end connector is simplified, the use amount of the wires is reduced, and the wire harness cost is reduced; in the temperature measurement process, extra heating current and voltage drop are not introduced into a detection circuit, and the temperature detection and control precision is high.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle electric heating dryers, in particular to an electric heating rod temperature control system. Background Art

[0002] At present, air dryers in suspension air supply systems generally use molecular sieves as desiccant and regenerate through heating. To ensure that the heating temperature meets the regeneration requirements and avoid over-temperature runaway, the heating rod needs to monitor the temperature value through a temperature sensor during the heating process, and the temperature control module implements precise control and over-temperature protection within the temperature range.

[0003] A heating element typically requires two wires connected to a power supply. A voltage is applied between the two wires to provide electrical energy, which the heating element converts into heat. A temperature sensor, such as a thermistor, typically uses two wires to connect to the input port of a temperature control module to monitor temperature changes. Therefore, in conventional solutions, a heating rod consisting of a heating element and a temperature sensor requires at least four external wires, making the wiring complex and confusing. Utility Model Content

[0004] The technical problem to be solved by the utility model is that the existing electric heating rod circuit is complicated and the temperature control is not precise enough.

[0005] In order to solve the above technical problems, the technical solution of the present invention is to provide an electric heating rod temperature control system, including an electric heating rod and a temperature control module, a heating element and a temperature sensor are provided in the electric heating rod, a first heating wire and a second heating wire are led out from the heating element, a first temperature wire and a second temperature wire are led out from the temperature sensor, the second temperature wire and the second heating wire are short-joined and formed into a common wire, the first heating wire, the first temperature wire and the common wire extend to the outside of the electric heating rod and are connected to the temperature control module.

[0006] Optionally, the temperature control module is provided with a temperature detection submodule, a heating rod driving submodule and a microcontroller module, the temperature detection submodule and the heating rod driving submodule are grounded through an electrical path, the first temperature wire is connected to the temperature detection submodule, and the first heating wire and the common wire are connected to the heating rod driving submodule.

[0007] Optionally, the heating rod driving submodule includes a low-level driving output terminal and a high-level driving output terminal, the output voltage of the low-level driving output terminal is 0V, the output voltage of the high-level driving output terminal is an adjustable positive voltage, the common wire is connected to the low-level driving output terminal, and the first heating wire is connected to the high-level driving output terminal.

[0008] Optionally, the low-level driving output end of the heating rod driving submodule is provided with a controllable power switch connected to the ground.

[0009] Optionally, a connector is provided between the electric heating rod and the temperature control module.

[0010] Optionally, the temperature detection submodule is provided with a power supply, a first resistor, a second resistor and a capacitor, the first temperature wire is connected to the second resistor, the other end of the second resistor is connected to the microcontroller module, the first resistor is connected to the second resistor through a wire and one end of the first temperature wire is connected, the power supply is connected to the first resistor, and the capacitor is connected in parallel to one end of the second resistor connected to the microcontroller module and grounded.

[0011] Optionally, the heating element is an electric heating wire or a ceramic heating tube, and the temperature sensor is a thermistor.

[0012] The temperature control method of the electric heating rod temperature control system includes the following steps:

[0013] S1. When heating is required, the microcontroller module sends a heating enable control signal, and the heating rod driving submodule provides heating voltage and current to the heating element through the first heating wire and the common wire for heating;

[0014] S2, the temperature sensor detects the temperature of the electric heating rod and transmits the temperature signal to the microcontroller module;

[0015] S3. The microcontroller module adjusts the output voltage of the heating rod driving submodule according to the acquired temperature information and the initial target requirements, thereby adjusting the heating temperature.

[0016] Optionally, in step S2, the temperature sensor measures the temperature of the electric heating rod at intervals. During the measurement, the microcontroller module controls the high-level drive output of the heating rod driving submodule to be turned off. After the measurement is completed, the microcontroller module controls the high-level drive output of the heating rod driving submodule to be turned on.

[0017] Optionally, in step S3, the microcontroller module determines the high-level drive output voltage state of the current heating rod driving submodule based on the detected heating rod temperature and the initial target temperature. If the temperature of the electric heating rod is lower than the target temperature, the high-level drive output voltage of the heating rod driving submodule is increased; if the temperature of the electric heating rod is higher than the target temperature, the high-level drive output of the heating rod driving submodule is turned off.

[0018] In summary, the present invention has at least one of the following beneficial effects:

[0019] 1. The utility model reduces the number of lead wires of the heating rod, simplifies the design of the connector at the lead end, reduces the amount of wires used, and reduces the cost of the wiring harness.

[0020] 2. During the temperature measurement process, the utility model does not introduce additional heating current and voltage drop into the detection circuit, and the temperature detection and control accuracy is high.

[0021] 3. The utility model reduces the number of interface signals at the temperature control module end and lowers the requirement on the number of pins of the temperature control end connector. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a schematic diagram of the temperature control system of the electric heating rod of the utility model;

[0023] Figure 2 This is a schematic diagram of the temperature control system of the electric heating rod with a connector of the utility model;

[0024] Figure 3 This is a wiring diagram of the utility model using a common lead wire and a connector outside the heating rod;

[0025] Figure 4 This is an embodiment of the temperature control system of the electric heating rod of the utility model;

[0026] Figure 5 This is a schematic diagram of the controllable power switch structure of the heating rod driving submodule of the utility model;

[0027] In the figure: 1. Electric heating rod; 101. Heating element; 1011. First heating wire; 1012. Second heating wire; 102. Temperature sensor; 1021. First temperature wire; 1022. Second temperature wire; 1012A. Common wire; 2. Temperature control module; 201. Temperature detection submodule; 202. Heating rod driving submodule; 203. Microcontroller module; 2011. Electrical path; 3. Connector; R1. First resistor; R2. Second resistor; C1. Capacitor. DETAILED DESCRIPTION

[0028] The following combination Figure 1-5 The utility model is described in further detail.

[0029] The utility model discloses an electric heating rod temperature control system, referring to Figure 1 and Figure 2 , including an electric heating rod 1 and a temperature control module 2. A heating element 101 and a temperature sensor 102 are provided in the electric heating rod 1. A first heating wire 1011 and a second heating wire 1012 are led out from the heating element 101. A first temperature wire 1021 and a second temperature wire 1022 are led out from the temperature sensor 102. The second temperature wire 1022 and the second heating wire 1012 are short-joined to form a common wire 1012A. The first heating wire 1011, the first temperature wire 1021 and the common wire 1012A extend to the outside of the electric heating rod 1 and are connected to the temperature control module 2.

[0030] In a further embodiment, referring to Figure 1 The temperature control module 2 is provided with a temperature detection submodule 201, a heating rod driving submodule 202 and a microcontroller module 203. The temperature detection submodule 201 and the heating rod driving submodule 202 are grounded through an electrical path 2011. The first temperature wire 1021 is connected to the temperature detection submodule 201, and the first heating wire 1011 and the common wire 1012A are connected to the heating rod driving submodule 202.

[0031] Specifically, the first temperature wire 1021 of the temperature sensor is connected to the temperature detection input terminal of the temperature control module 2; the heating rod driving submodule 202 includes a low-level driving output terminal and a high-level driving output terminal, the output voltage of the low-level driving output terminal is 0V, and the output voltage of the high-level driving output terminal is an adjustable positive voltage, the common wire 1012A is connected to the low-level driving output terminal, and the first heating wire 1011 is connected to the high-level driving output terminal;

[0032] like Figure 5 As shown, the low-level drive output end of the heating rod drive submodule 202 is provided with a controllable power switch connected to the ground. When the system is working, the power switch is continuously turned on, and the low-level drive output is connected to the internal power reference ground 0V of the temperature control module 2; when the system is not working, the power switch is turned off, and the low-level drive output is disconnected from the internal power reference ground of the temperature control module 2.

[0033] In other embodiments, referring to Figure 2 and Figure 3 A connector 3 is provided between the electric heating rod 1 and the temperature control module 2 to facilitate the use and replacement of the electric heating rod 1 and its connector 3 as independent components. The second temperature wire 1022 and the second heating wire 1012 can be short-circuited inside or outside the electric heating rod 1.

[0034] In a further embodiment, referring to Figure 4 The temperature detection submodule 201 is provided with an internal VCC power supply, a first resistor R1, a second resistor R2, and a capacitor C1. The first temperature wire 1021 is connected to the second resistor R2, and the other end of the second resistor R2 is connected to the microcontroller module 203. The first resistor R1 is connected to the second resistor R2 through a wire and one end of the first temperature wire 1021 is connected. The power supply is connected to the first resistor R1. The capacitor C1 is connected in parallel with the second resistor R2 and one end of the microcontroller module 203 is connected and grounded.

[0035] Specifically, the temperature detection submodule 201 is powered by the internal VCC power supply through the first resistor R1 to supply power to the temperature sensor 102, and the current voltage value of the temperature sensor 102 is obtained after filtering through the second resistor R2 and the capacitor C1. The current temperature value is measured and calculated by the microcontroller module 203. The low-level drive output of the heating rod drive submodule 202 is connected to the internal power reference ground of the temperature control module 2, and the high-level drive output circuit is a half-bridge drive output, which can control its input to output 0V or drive the power supply voltage VBAT, and can adjust its output effective voltage value between 0V and VBAT voltage through PWM (pulse width modulation).

[0036] In a further embodiment, the heating element 101 is an electric heating wire or a ceramic heating tube, etc., and the temperature sensor 102 is a thermistor, etc. In order to improve the temperature control accuracy and reduce the temperature control overshoot, the temperature control module 2 uses PID control to control the heating temperature of the electric heating rod 1.

[0037] The temperature control method of the electric heating rod temperature control system includes the following steps:

[0038] S1. When heating is required, the microcontroller module 203 sends a heating enable control signal, and the heating rod driving submodule 202 provides heating voltage and current to the heating element 101 through the first heating wire 1011 and the common wire 1012A for heating;

[0039] S2, the temperature sensor 102 detects the temperature of the electric heating rod 1 and transmits the temperature signal to the microcontroller module 203;

[0040] Specifically, for the temperature sensor 102, its second temperature wire 1022 is connected to the 0V voltage reference terminal inside the temperature control module 2 through the common wire 1012A, and the other first temperature wire 1021 outputs a temperature signal to the temperature detection submodule 201. Since the temperature detection submodule 201 and the heating rod driving submodule 202 are grounded through the electrical path 2011, the temperature detection submodule 201 can obtain the voltage output from both ends of the temperature sensor 102 by measuring the voltage between the first temperature wire 1021 and its reference 0V, and obtain the current temperature of the electric heating rod 1 after processing by the microcontroller module 203;

[0041] S3, the microcontroller module 203 adjusts the output voltage of the heating rod driving submodule 202 according to the acquired temperature information and the initial target requirement, thereby adjusting the heating temperature;

[0042] Specifically, the microcontroller module 203 determines the high-level drive output voltage state of the current heating rod driving submodule 202 based on the detected heating rod temperature and the initial target temperature. If the temperature of the electric heating rod 1 is lower than the target temperature, the high-level drive output voltage of the heating rod driving submodule 202 is increased; if the temperature of the electric heating rod 1 is higher than the target temperature, the high-level drive output of the heating rod driving submodule 202 is turned off.

[0043] In a further embodiment, in step S2, considering that when the heating element 101 is working, the larger heating current flowing through the common wire 1012A will generate a certain voltage drop on the line, and the voltage drop will be directly introduced into the signal voltage input by the temperature detection submodule 201, resulting in an increase in temperature detection error and a decrease in accuracy. For this reason, for the heating element 101 with a large heating current, a long connecting wire, and a high temperature detection accuracy requirement, the utility model controls the temperature sensor 102 through the microcontroller module 203 to measure the temperature of the electric heating rod 1 at intervals. During measurement, the microcontroller module 203 controls the high-level drive output of the heating rod driving submodule 202 to be turned off. After the measurement is completed, the microcontroller module 203 controls the high-level drive output of the heating rod driving submodule 202 to be turned on. Because no additional heating current and voltage drop are introduced into the detection circuit during the temperature measurement process, the temperature detection and control accuracy are guaranteed.

[0044] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, and all of these should be included in the scope of the claims of the present invention.

Claims

1. Electric heating rod temperature control system, characterized in that, The invention comprises an electric heating rod (1) and a temperature control module (2). The electric heating rod (1) is provided with a heating element (101) and a temperature sensor (102). A first heating wire (1011) and a second heating wire (1012) are led out from the heating element (101). A first temperature wire (1021) and a second temperature wire (1022) are led out from the temperature sensor (102). The second temperature wire (1022) and the second heating wire (1012) are short-jointed and formed into a common wire (1012A). The first heating wire (1011), the first temperature wire (1021) and the common wire (1012A) extend to the outside of the electric heating rod (1) and are connected to the temperature control module (2).

2. The electric heating rod temperature control system according to claim 1, characterized in that: The temperature control module (2) is provided with a temperature detection submodule (201), a heating rod driving submodule (202) and a microcontroller module (203); the temperature detection submodule (201) and the heating rod driving submodule (202) are grounded via an electrical path (2011); the first temperature wire (1021) is connected to the temperature detection submodule (201); and the first heating wire (1011) and the common wire (1012A) are connected to the heating rod driving submodule (202).

3. The electric heating rod temperature control system according to claim 2, characterized in that: The heating rod driving submodule (202) comprises a low-level driving output terminal and a high-level driving output terminal, wherein the output voltage of the low-level driving output terminal is 0V, and the output voltage of the high-level driving output terminal is an adjustable positive voltage, the common wire (1012A) is connected to the low-level driving output terminal, and the first heating wire (1011) is connected to the high-level driving output terminal.

4. The electric heating rod temperature control system according to claim 3, characterized in that: A controllable power switch connected to the ground is provided at the low-level driving output end of the heating rod driving submodule (202).

5. The electric heating rod temperature control system according to claim 1, characterized in that: A connector (3) is provided between the electric heating rod (1) and the temperature control module (2).

6. The electric heating rod temperature control system according to claim 2, characterized in that: The temperature detection submodule (201) is provided with a power supply, a first resistor (R1), a second resistor (R2) and a capacitor (C1); the first temperature wire (1021) is connected to the second resistor (R2); the other end of the second resistor (R2) is connected to a microcontroller module (203); the first resistor (R1) is connected to one end of the second resistor (R2) connected to the first temperature wire (1021) via a wire; the power supply is connected to the first resistor (R1); the capacitor (C1) is connected in parallel to one end of the second resistor (R2) connected to the microcontroller module (203) and is grounded.

7. The electric heating rod temperature control system according to claim 1, characterized in that: The heating element (101) is an electric heating wire or a ceramic heating tube, and the temperature sensor (102) is a thermistor.

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