A solenoid valve driving method and system for an igniter

Abstract

The present invention discloses a solenoid valve driving method and system for an igniter, wherein the solenoid valve driving method includes: S1, initializing the control system of the igniter; S2, detecting whether the control system issues an ignition command, if so, entering S3, otherwise returning to S1; S3, the control end of the solenoid valve outputs a low-frequency PWM signal for driving the strong suction coil of the solenoid valve; S4, detecting whether the ignition is successful, if so, entering S5, otherwise returning to S3; S5, the control end of the solenoid valve outputs a high-frequency PWM signal for driving the maintenance coil of the solenoid valve. During ignition, a low-frequency PWM signal is output through the control end, and after the ignition is successful, a high-frequency PWM signal is output through the control end; the low-frequency PWM signal controls the strong suction coil, and the high-frequency PWM signal controls the maintenance coil. In this way, a low-frequency PWM signal and a high-frequency PWM signal are output through a control end, replacing the conventional two-wire I0 port to drive the self-priming solenoid valve, solving the problem of insufficient chip pin information.

Description

Technical Field

[0001] The invention belongs to the technical field of electromagnetic valves, and in particular relates to a method and system for driving an electromagnetic valve used in an igniter. Background Art

[0002] The igniter of the stove is generally ignited and maintained by a self-priming solenoid valve; the traditional self-priming solenoid valve includes a strong suction coil and a maintenance coil.

[0003] The conventional method of driving a self-priming solenoid valve is to use a two-wire IO port, one wire is used to drive the strong suction coil, and the other wire is used to drive the maintenance coil. This method has obvious disadvantages, that is, when the control chip pin resources are scarce, if two IO ports are occupied to drive the self-priming solenoid valve, it is difficult to take into account the transmission of other signals, resulting in insufficient pins. Summary of the invention

[0004] In order to solve the above problems, the present invention provides a solenoid valve driving method for an igniter, which outputs a low-frequency PWM signal and a high-frequency PWM signal through a control terminal, replacing the conventional two-wire I0 port to drive the self-priming solenoid valve, thereby solving the problem of insufficient chip pin information.

[0005] Another object of the present invention is to provide a solenoid valve driving system for an igniter.

[0006] The technical solution adopted by the present invention is:

[0007] A solenoid valve driving method for an igniter is implemented in the following steps:

[0008] S1, initialize the control system of the igniter;

[0009] S2, detect whether the control system issues an ignition command, if yes, go to S3, otherwise return to S1;

[0010] S3, the control end of the solenoid valve outputs a low-frequency PWM signal to drive the strong suction coil of the solenoid valve;

[0011] S4, check whether the ignition is successful, if yes, go to S5, otherwise return to S3;

[0012] S5, the control end of the solenoid valve outputs a high-frequency PWM signal to drive the maintaining coil of the solenoid valve.

[0013] Preferably, after S5, the solenoid valve driving method further includes:

[0014] S6, real-time detection of whether the igniter is in a burning state, if so, return to S5, otherwise the control end of the solenoid valve stops outputting the PWM signal.

[0015] Preferably, the control end of the solenoid valve in S3 outputs a low-frequency PWM signal for driving the strong suction coil of the solenoid valve, specifically:

[0016] S31, the control end of the solenoid valve outputs a PWM signal;

[0017] S32, the PWM signal is passed through a low-pass filter to generate a low-frequency PWM signal;

[0018] Wherein, the frequency of the low-frequency PWM signal satisfies the following conditions:

[0019] f L ≤f c1 / 2

[0020] In the above formula, f L is the frequency of the low-frequency PWM signal, f c1 is the cutoff frequency of the low-pass filter;

[0021] S33, the low-frequency PWM signal acts on the strong suction coil of the solenoid valve to achieve ignition.

[0022] Preferably, the control end of the solenoid valve in S5 outputs a high-frequency PWM signal for driving the maintaining coil of the solenoid valve, specifically:

[0023] S51, the control end of the solenoid valve outputs a PWM signal;

[0024] S52, the PWM signal is passed through a high-pass filter to generate a high-frequency PWM signal;

[0025] Wherein, the frequency of the high-frequency PWM signal satisfies the following conditions:

[0026] f H ≥2f c2

[0027] In the above formula, f H is the frequency of the high-frequency PWM signal, f c2 is the cutoff frequency of the high-pass filter;

[0028] S53, the high-frequency PWM signal acts on the maintaining coil of the solenoid valve to keep the solenoid valve in a closed state.

[0029] Preferably, the cut-off frequency of the low-pass filter depends on parameters of a resistor and a capacitor constituting the low-pass filter, and the cut-off frequency of the high-pass filter depends on parameters of a resistor and a capacitor constituting the high-pass filter.

[0030] A solenoid valve driving system for an igniter, which is used to implement the above-mentioned solenoid valve driving method, comprises a control end of the solenoid valve, a low-frequency PWM module, a high-frequency PWM module, a strong suction coil, and a maintaining coil; the control end is connected to the input end of the low-frequency PWM module and the input end of the high-frequency PWM module, the output end of the low-frequency PWM module is connected to the strong suction coil, the output end of the high-frequency PWM module is connected to the maintaining coil, and the strong suction coil and the maintaining coil are coils inside the solenoid valve.

[0031] Preferably, the low-frequency PWM module is a low-pass filter.

[0032] Preferably, the low-pass filter includes a first resistor R1 and a first capacitor C1 connected to its input end, one end of the first resistor R1 is connected to the control end as the input end of the low-pass filter, the other end of the first resistor R1 is grounded through the first capacitor C1, and the common connection end between the first resistor R1 and the first capacitor C1 is connected to the strong suction coil as the output end of the low-pass filter.

[0033] Preferably, the high-frequency PWM module is a high-pass filter.

[0034] Preferably, the high-pass filter includes a second capacitor C2 and a second resistor R2 connected to the air input end, one end of the second capacitor C2 is connected to the control end as the input end of the high-pass filter, the other end of the second capacitor C2 is grounded through the second resistor R2, and the common end between the second capacitor C2 and the second resistor R2 is connected to the maintaining coil as the output end of the high-pass filter.

[0035] Compared with the prior art, the present invention is implemented by first turning on the power supply to initialize the control system of the igniter; detecting whether the control system issues an ignition command, if so, the control end of the solenoid valve outputs a low-frequency PWM signal for driving the strong suction coil of the solenoid valve; then detecting whether the ignition is successful, if so, the control end of the solenoid valve outputs a high-frequency PWM signal for driving the maintenance coil of the solenoid valve;

[0036] The present invention outputs a low-frequency PWM signal and a high-frequency PWM signal through a control terminal, replacing a conventional two-wire I0 port to drive a self-priming electromagnetic valve, thereby solving the problem of insufficient chip pin information. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 is a flow chart of a solenoid valve driving method for an igniter provided in Example 1 of the present invention;

[0038] Figure 2 is a schematic diagram of a solenoid valve drive system for an igniter provided in Example 2 of the present invention;

[0039] Figure 3 is a circuit diagram of a low-pass filter in a solenoid valve driving system for an igniter provided in Embodiment 2 of the present invention;

[0040] Figure 4 1 is a circuit diagram of a high-pass filter in a solenoid valve drive system for an igniter provided in Example 2 of the present invention.

[0041] in:

[0042] 1. Control end, 2. Low frequency PWM module, 3. High frequency PWM module, 4. Strong suction coil, 5. Maintain coil. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0044] Example 1

[0045] Embodiment 1 of the present invention provides a solenoid valve driving method for an igniter, such as Figure 1 As shown, the specific steps are as follows:

[0046] S1, initialize the control system of the igniter;

[0047] S2, detect whether the control system issues an ignition command, if yes, go to S3, otherwise return to S1;

[0048] S3, the control end of the solenoid valve outputs a low-frequency PWM signal to drive the strong suction coil of the solenoid valve;

[0049] S4, check whether the ignition is successful, if yes, go to S5, otherwise return to S3;

[0050] S5, the control end of the solenoid valve outputs a high-frequency PWM signal to drive the maintaining coil of the solenoid valve.

[0051] S6, real-time detection of whether the igniter is in a burning state, if so, return to S5, otherwise the control end of the solenoid valve stops outputting the PWM signal.

[0052] In this embodiment, during ignition, a low-frequency PWM signal is output through the control end of the solenoid valve, and after successful ignition, a high-frequency PWM signal is output through the control end of the solenoid valve; the low-frequency PWM signal controls the strong suction coil of the solenoid valve, while the maintaining coil is powered off, and the high-frequency PWM signal controls the maintaining coil of the solenoid valve, while the strong suction coil is powered off. The significance of this is that during ignition, the strong suction coil of the solenoid valve needs to be driven to connect the gas, and after successful ignition, the maintaining coil of the solenoid valve needs to be driven to keep the gas in a connected state to maintain combustion.

[0053] In a specific embodiment, the control end of the solenoid valve in S3 outputs a low-frequency PWM signal for driving the strong suction coil of the solenoid valve, specifically:

[0054] S31, the control end of the solenoid valve outputs a PWM signal;

[0055] S32, the PWM signal is passed through a low-pass filter to generate a low-frequency PWM signal;

[0056] Wherein, the frequency of the low-frequency PWM signal satisfies the following conditions:

[0057] f L ≤f c1 / 2

[0058] In the above formula, f L is the frequency of the low-frequency PWM signal, f c1 is the cutoff frequency of the low-pass filter;

[0059] S33, the low-frequency PWM signal acts on the strong suction coil of the solenoid valve to achieve ignition.

[0060] In this specific embodiment, the main functions of the low-pass filter are: low-frequency signals can pass normally, while high-frequency signals exceeding a set critical value are blocked and weakened;

[0061] Specifically, low-pass filtering can be simply considered as: setting a frequency point, when the signal frequency is higher than the frequency point, it cannot pass. In digital signals, this frequency point is also the cutoff frequency. When the frequency is higher than the cutoff frequency, all values ​​are assigned to 0, and the frequency cannot pass at this time;

[0062] In this way, a PWM signal is first outputted through the control end of the solenoid valve, and then the PWM signal is passed through a low-pass filter to generate a low-frequency PWM signal; then, the low-frequency PWM signal acts on the strong suction coil of the solenoid valve to achieve ignition.

[0063] In a specific embodiment, the control end of the solenoid valve in S5 outputs a high-frequency PWM signal for driving the maintaining coil of the solenoid valve, specifically:

[0064] S51, the control end of the solenoid valve outputs a PWM signal;

[0065] S52, the PWM signal is passed through a high-pass filter to generate a high-frequency PWM signal;

[0066] Wherein, the frequency of the high-frequency PWM signal satisfies the following conditions:

[0067] f H ≥2f c2

[0068] In the above formula, f H is the frequency of the high-frequency PWM signal, f c2 is the cutoff frequency of the high-pass filter;

[0069] S53, the high-frequency PWM signal acts on the maintaining coil of the solenoid valve to keep the solenoid valve in a closed state.

[0070] In this specific embodiment, the main functions of the high-pass filter are: high-frequency signals can pass normally, while high-frequency signals below a set critical value are blocked and weakened;

[0071] Specifically, high-pass filtering can be simply considered as: setting a frequency point, when the signal frequency is higher than the frequency point, it cannot pass. In digital signals, this frequency point is also the cutoff frequency. When the frequency is lower than the cutoff frequency, all values ​​are assigned to 0, and the frequency cannot pass at this time;

[0072] In this way, a PWM signal is first output through the control end of the solenoid valve, and then the PWM signal is passed through a high-pass filter to generate a low-frequency PWM signal; then, the high-frequency PWM signal acts on the maintenance coil of the solenoid valve to keep the solenoid valve in the closed state.

[0073] It can be seen that the control end in this embodiment normally outputs a PWM signal, and after the PWM signal is filtered by a low-pass filter and a high-pass filter, unnecessary frequency signals are filtered out, and the remaining frequency signals just act on the corresponding coils to drive the solenoid valve; the cleverness lies in: only one control end is required to output a PWM signal to drive the strong suction coil and the maintenance coil of the solenoid valve, compared with the traditional method of driving the strong suction coil and the maintenance coil separately through two IO ports, it saves chip pins.

[0074] The cut-off frequency of the low-pass filter depends on the parameters of the resistor and capacitor constituting the low-pass filter, and the cut-off frequency of the high-pass filter depends on the parameters of the resistor and capacitor constituting the high-pass filter;

[0075] The circuits of low-pass filters and high-pass filters are generally composed of resistors and capacitors, and the cut-off frequency is calculated as follows:

[0076] f c1 =1 / (2πR1C1)

[0077] f c2 =1 / (2πR2C2)

[0078] In the above formula, f c1 and f c2are the cut-off frequencies of the low-pass filter and the high-pass filter respectively, R1 and C1 are the resistance value of the resistor and the capacitance value of the capacitor constituting the low-pass filter respectively, R2 and C2 are the resistance value of the resistor and the capacitance value of the capacitor constituting the high-pass filter respectively.

[0079] In this embodiment, the high-frequency PWM signal is filtered out by a low-pass filter, and the remaining low-frequency PWM signal acts on the strong suction coil of the solenoid valve to achieve ignition; the low-frequency PWM signal is filtered out by a high-pass filter, and the remaining high-frequency PWM signal acts on the maintenance coil of the solenoid valve to keep the solenoid valve in the attracted state, and the PWM signal is output through the control end; that is: the output of low-frequency PWM signal and high-frequency PWM signal is achieved simultaneously through the control end, and the control end only needs to be connected to one chip pin. Therefore, this embodiment solves the problem of wasting pin resources when the self-priming solenoid valve is driven by the two-wire I0 port.

[0080] Example 2

[0081] Embodiment 2 of the present invention provides a solenoid valve driving system for an igniter, such as Figure 2 As shown, it is used to implement the solenoid valve driving method described in Example 1, which includes a solenoid valve control terminal 1, a low-frequency PWM module 2, a high-frequency PWM module 3, a strong suction coil 4 and a maintaining coil 5; the control terminal 1 is connected to the input terminal of the low-frequency PWM module 2 and the input terminal of the high-frequency PWM module 3, the output terminal of the low-frequency PWM module 2 is connected to the strong suction coil 4, the output terminal of the high-frequency PWM module 3 is connected to the maintaining coil 5, and the strong suction coil 4 and the maintaining coil 5 are coils in the solenoid valve.

[0082] Thus, with the above structure, when there is an ignition command, the control terminal 1 outputs a low-frequency PWM signal through the low-frequency PWM module 2 to drive the strong suction coil 4 of the electromagnetic valve to connect the gas and realize ignition;

[0083] When the ignition is successful, the control terminal 1 outputs a high-frequency PWM signal through the high-frequency PWM module 3 to drive the maintaining coil 5 of the electromagnetic valve to keep the gas in the on state to maintain combustion.

[0084] This embodiment uses a control terminal 1, combined with a low-frequency PWM module 2 and a high-frequency PWM module 3 to output two signals (a low-frequency PWM signal and a high-frequency PWM signal). The two signals are used to drive their corresponding coils respectively, thereby controlling the stable operation of the solenoid valve. Compared with the traditional method of driving the self-priming solenoid valve through a two-wire I0 port, this structure significantly saves chip pins.

[0085] In a specific embodiment, the low-frequency PWM module 2 is a low-pass filter.

[0086] like Figure 3As shown, the low-pass filter includes a first resistor R1 and a first capacitor C1 connected to its input end, one end of the first resistor R1 is connected to the control end 1 as the input end of the low-pass filter, the other end of the first resistor R1 is grounded through the first capacitor C1, and the common connection end between the first resistor R1 and the first capacitor C1 is connected to the strong suction coil 4 as the output end of the low-pass filter.

[0087] In a specific embodiment, the high-frequency PWM module 3 is a high-pass filter.

[0088] like Figure 4 As shown, the high-pass filter includes a second capacitor C2 and a second resistor R2 connected to the gas input end, one end of the second capacitor C2 is connected to the control end 1 as the input end of the high-pass filter, the other end of the second capacitor C2 is grounded through the second resistor R2, and the common end between the second capacitor C2 and the second resistor R2 is connected to the maintenance coil 5 as the output end of the high-pass filter.

[0089] This embodiment realizes an interface (control end) to control the solenoid valve through the mutual cooperation between the control end, the low-frequency PWM module and the high-frequency PWM module; and the low-frequency PWM module and the high-frequency PWM module are respectively a low-pass filter and a high-pass filter, with a simple structure, low cost and easy promotion.

[0090] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A solenoid valve driving method for an igniter, characterized in that: The specific steps are as follows: S1, initialize the control system of the igniter; S2, detect whether the control system issues an ignition command, if yes, go to S3, otherwise return to S1; S3, the control end of the solenoid valve outputs a low-frequency PWM signal to drive the strong suction coil of the solenoid valve; S4, check whether the ignition is successful, if yes, go to S5, otherwise return to S3; S5, the control end of the solenoid valve outputs a high-frequency PWM signal to drive the maintaining coil of the solenoid valve; After S5, the solenoid valve driving method further includes: S6, real-time detection of whether the igniter is in a combustion state, if so, returning to S5, otherwise the control end of the solenoid valve stops outputting the PWM signal; The control end of the solenoid valve in S3 outputs a low-frequency PWM signal to drive the strong suction coil of the solenoid valve, specifically: S31, the control end of the solenoid valve outputs a PWM signal; S32, the PWM signal is passed through a low-pass filter to generate a low-frequency PWM signal; Wherein, the frequency of the low-frequency PWM signal satisfies the following conditions: f L ≤f c1 / 2 In the above formula, f L is the frequency of the low-frequency PWM signal, f c1 is the cutoff frequency of the low-pass filter; S33, the low-frequency PWM signal acts on the strong suction coil of the solenoid valve to achieve ignition; The control end of the solenoid valve in S5 outputs a high-frequency PWM signal for driving the maintaining coil of the solenoid valve, specifically: S51, the control end of the solenoid valve outputs a PWM signal; S52, the PWM signal is passed through a high-pass filter to generate a high-frequency PWM signal; Wherein, the frequency of the high-frequency PWM signal satisfies the following conditions: f H ≥2f c2 In the above formula, f H is the frequency of the high-frequency PWM signal, f c2 is the cutoff frequency of the high-pass filter; S53, the high-frequency PWM signal acts on the maintaining coil of the solenoid valve to keep the solenoid valve in a closed state.

2. A solenoid valve driving method for an igniter according to claim 1, characterized in that: The cut-off frequency of the low-pass filter depends on the parameters of the resistor and capacitor constituting the low-pass filter, and the cut-off frequency of the high-pass filter depends on the parameters of the resistor and capacitor constituting the high-pass filter.

3. A solenoid valve drive system for an igniter, characterized in that: It is used to implement the solenoid valve driving method described in any one of claims 1 to 2, and comprises a control end (1) of the solenoid valve, a low-frequency PWM module (2), a high-frequency PWM module (3), a strong suction coil (4) and a maintaining coil (5); the control end (1) is connected to the input end of the low-frequency PWM module (2) and the input end of the high-frequency PWM module (3), the output end of the low-frequency PWM module (2) is connected to the strong suction coil (4), the output end of the high-frequency PWM module (3) is connected to the maintaining coil (5), and the strong suction coil (4) and the maintaining coil (5) are coils inside the solenoid valve.

4. The solenoid valve driving system for an igniter according to claim 3, characterized in that: The low-frequency PWM module (2) is a low-pass filter.

5. The solenoid valve driving system for an igniter according to claim 4, characterized in that: The low-pass filter comprises a first resistor R1 and a first capacitor C1, one end of the first resistor R1 is connected to the control end (1) as an input end of the low-pass filter, the other end of the first resistor R1 is grounded via the first capacitor C1, and the common connection end between the first resistor R1 and the first capacitor C1 is connected to the strong suction coil (4) as an output end of the low-pass filter.

6. The solenoid valve driving system for an igniter according to claim 3, characterized in that: The high-frequency PWM module (3) is a high-pass filter.

7. The solenoid valve driving system for an igniter according to claim 6, characterized in that: The high-pass filter comprises a second capacitor C2 and a second resistor R2, one end of the second capacitor C2 is connected to the control end (1) as an input end of the high-pass filter, the other end of the second capacitor C2 is grounded via the second resistor R2, and the common end between the second capacitor C2 and the second resistor R2 is connected to the maintaining coil (5) as an output end of the high-pass filter.

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