CN201955056U - Gap detecting circuit of engine rotation speed sensor - Google Patents

Abstract

The utility model discloses a gap detection circuit for an engine speed sensor, which includes a main control chip, and is characterized in that the voltage detection end of the main control chip is connected with a speed signal voltage processing circuit, and the frequency detection end of the main control chip is connected with a speed A signal pulse processing circuit, the display end group of the main control chip is connected with an LCD display. The effect of the utility model is that the gap between the rotational speed sensor and the magnetic bag can be accurately detected without opening the engine. Realize engine loading detection and engine no-load detection. The utility model has simple detection operation, flexible scheme, can be made into a portable instrument, and provides efficient support for after-sales work.

Description

Engine speed sensor gap detection circuit

technical field

The utility model belongs to an engine speed sensor gap detection technology, in particular to a motor speed sensor gap detection circuit for motorcycles.

Background technique

When the magneto in the engine is running, the boss on its surface cuts the magnetic field lines of the speed sensor fixed next to it, and generates a corresponding speed signal, which is an important sensor signal basis for the engine management system. The speed sensor is a magnetoelectric type. The speed sensor is installed on the engine case or side cover, and the gap between it and the magneto is adjusted when the engine is assembled, but in practical applications, some installation errors will cause signal deviations, especially for repaired engines. There is often a large deviation from the initial value, which affects the performance of the engine, especially the ignition advance angle and the speed signal judgment error rate.

But the shortcoming of prior art is: also there is not a kind of motor speed sensor gap detection circuit that motorcycle is used, can't detect the gap between speed sensor and magnetic bag quickly and accurately.

Utility model content

The problem to be solved by the utility model is to provide a gap detection circuit of the engine speed sensor, which can accurately detect the gap between the speed sensor and the magnetic package without turning on the engine.

In order to achieve the above object, the utility model provides an engine speed sensor gap detection circuit, including a main control chip. The key is that the voltage detection terminal of the main control chip is connected with a speed signal voltage processing circuit, and the frequency detection The terminal is connected with a speed signal pulse processing circuit, and the display terminal group of the main control chip is connected with an LCD display.

Use the speed sensor signal to calculate and display the gap size. The user only needs to lead the engine speed signal to the engine speed sensor gap detection circuit and keep the engine at a certain speed to view the gap between the speed sensor and the magneto convex hull in real time. There is no need to open the engine casing, the detection operation is simple, the scheme is flexible, and it can be made into a portable instrument to provide efficient support for the pre-installation detection and after-sales work of the engine.

In this scheme, the voltage and frequency of the signal of the speed signal sensor are used as the basis, and the gap between the speed sensor and the magneto convex hull is calculated according to the data table and experience obtained from the experiment, and the gap is corrected by the temperature signal. , get the final theoretical gap value, and display the gap size, current speed, voltage and current temperature on the LCD1 display.

The speed signal voltage processing circuit is provided with a first operational amplifier, the negative input terminal of the first operational amplifier is connected to one end of the third resistor, and the other end of the third resistor is connected to the reference voltage;

The positive input terminal of the first operational amplifier is connected to one end of the second resistor, and the other end of the second resistor is connected to the speed signal A end of the speed sensor;

A first resistor is connected in series between the positive input terminal and the output terminal of the first operational amplifier, and the output terminal is also connected to the voltage detection terminal of the main control chip.

The speed signal voltage processing circuit is used to detect the current voltage value.

The rotational speed signal pulse processing circuit is provided with a second operational amplifier, the negative input terminal of the second operational amplifier is connected to one end of the seventh resistor, and the other end of the seventh resistor is connected to the rotational speed signal A terminal of the rotational speed sensor, The speed signal terminal A is connected to the reference voltage through the fourth resistor;

The positive input terminal of the second operational amplifier is connected to one end of the eighth resistor, and the other end of the eighth resistor is connected to the speed signal B end of the speed sensor, and the speed signal B end is connected to the reference voltage through the fifth resistance superior;

A sixth resistor is connected in series between the positive input terminal and the output terminal of the second operational amplifier, and the output terminal is also connected to the frequency detection terminal of the main control chip.

The speed signal pulse processing circuit is used to detect the current speed value.

A temperature sensor is connected to the temperature detection terminal of the main control chip.

The temperature sensor is used to detect the current temperature value.

The display terminal group of the main control chip is composed of a first display terminal, a second display terminal, a third display terminal and a fourth display terminal, and the first display terminal, the second display terminal, the third display terminal, the fourth display terminal The display terminal is connected to the same LCD display.

The loading detection method of the engine speed sensor gap detection circuit: its key lies in:

First, the speed signal A and the speed signal B of the engine speed sensor gap detection circuit are respectively connected to the first tap and the second tap of the speed sensor output coil;

Second, start the engine and run it at idle speed;

The main control chip performs the following steps:

Initialization, counter T1=0, T2=0, set the minimum no-load speed value speed, set the first set times and the second set times;

The period t1 of the first acquisition of the rotational speed signal;

After a delay for a period of time, the second acquisition speed signal cycle t2;

Judging whether the absolute value of the difference between t1 and t2 is within the allowable range, that is, judging whether the current rotation of the engine is stable;

If the absolute value of the difference between t1 and t2 is outside the allowable range, that is, the current rotation of the engine is not stable, it is necessary to return to the step of initialization, counter T1=0, and collect again;

If the absolute value of the difference between t1 and t2 is within the allowable range, that is, the current rotation of the engine is stable, then T1=T1+1;

Judging whether T1 is greater than the first set number of times;

If T1 is not greater than the first set number of times, return to the step of collecting the rotation speed signal cycle t1 for the first time, and collect again;

If T1 is greater than the first set number of times, the engine speed R is calculated based on the value of the second acquisition speed signal cycle t2;

Determine whether the engine speed R is greater than the minimum idle speed value speed;

If the engine speed R is not greater than the minimum idle speed value speed, then return to the initialization, the step of counter T1=0, and re-acquire again;

If the engine speed R is greater than the minimum idle speed value speed;

Collect and record the reading speed signal voltage Vc, collect the value of the speed signal period t3 again, and calculate the engine speed R;

T2=T2+1

Judging whether T2 is greater than the second set number of times;

If T2 is not greater than the second set number of times, then return to the step of collecting and recording the reading speed signal voltage Vc, collecting the value of the speed signal cycle t3 again, and calculating the engine speed R;

If T2 is greater than the second set number of times, the average values of Vc and R obtained in the second set number of times are respectively taken and recorded;

Collect the current temperature C of the engine;

Determine whether the current temperature C is greater than the upper limit temperature value c1, if the current temperature C is greater than the upper limit temperature value, then the temperature coefficient K=k1;

If the current temperature C is less than or equal to the upper limit temperature value, judge whether the current temperature C is greater than the lower limit temperature value c2,

If the current temperature C is between the lower limit temperature value and the upper limit temperature value, then the temperature coefficient K=k2;

If the current temperature C is less than or equal to the lower limit temperature value, then the temperature coefficient K=k3;

c1=30 degrees, c2=5 degrees, k1=1.05, k2=1, k3=0.94.

The value of the rotational speed signal voltage Vc is: Vc=Vc×K;

Call the speed-voltage-gap table, check the gap S between the speed sensor and the magnetic package by Vc and R;

The main control chip drives the LCD display to display S, Vc and R;

Finish.

The no-load detection method of the engine speed sensor gap detection circuit: its key lies in:

First, the speed signal A and the speed signal B of the engine speed sensor gap detection circuit are respectively connected to the first tap and the second tap of the speed sensor output coil;

Secondly, turn the engine with no load; the engine is turned by external force such as pedal or manual.

The main control chip is realized according to the following steps:

Initialize, set the minimum no-load speed value speed;

The period t1 of the first acquisition of the rotational speed signal;

After a delay for a period of time, the second acquisition speed signal cycle t2;

Determine whether t2 is greater than t1;

If t2 is greater than t1, then record t2, and read the speed signal voltage Vc, make t1=t2, and return to the step of judging whether t2 is greater than t1;

If t2 is not greater than t1, calculate the engine speed R by the value of t2;

Determine whether R is greater than speed;

If R is less than or equal to speed, return to the step of collecting the period t1 of the rotational speed signal for the first time;

If R is greater than speed, then collect the current temperature C of the engine;

Determine whether the current temperature C is greater than the upper limit temperature value c1, if the current temperature C is greater than the upper limit temperature value, then the temperature coefficient K=k1;

If the current temperature C is less than or equal to the upper limit temperature value, judge whether the current temperature C is greater than the lower limit temperature value c2,

If the current temperature C is between the lower limit temperature value and the upper limit temperature value, then the temperature coefficient K=k2;

If the current temperature C is less than or equal to the lower limit temperature value, then the temperature coefficient K=k3;

c1=30 degrees, c2=5 degrees, k1=1.05, k2=1, k3=0.94.

The value of the rotational speed signal voltage Vc is: Vc=Vc×K;

Call the speed-voltage-gap table, check the gap S between the speed sensor and the magnetic package by Vc and R;

The main control chip drives the LCD display to display S, Vc and R;

Return to the step of collecting the rotation speed signal period t1 for the first time.

The main function of this program is to directly start the engine with a kick or electric start without igniting the engine, and the engine speed sensor gap detection circuit will automatically capture and display the sensor gap.

In this process, the captured maximum rotational speed and voltage are used as the judgment basis, and the actual clearance between the rotational speed sensor and the magneto convex hull is read according to the relationship table of engine no-load detected rotational speed R-voltage Vc-gap S.

The effect of the utility model is: a detection circuit for the gap between the speed sensor of the engine can accurately detect the gap between the speed sensor and the magnetic package without opening the engine. Realize engine loading detection and engine no-load detection. The utility model has simple detection operation, flexible scheme, can be made into a portable instrument, and provides efficient support for after-sales work.

Description of drawings

Fig. 1 is the circuit diagram of engine speed sensor gap detection circuit;

Fig. 2 is the flow chart of the utility model loading detection;

Fig. 3 is the flowchart of no-load detection of the utility model;

Fig. 4 is a schematic diagram of the relationship table of the engine loading detection speed R-voltage Vc-gap S;

FIG. 5 is a schematic diagram showing the relationship between the engine no-load detected rotational speed R-voltage Vc-gap S.

Detailed ways

Below in conjunction with accompanying drawing and embodiment the utility model is further described:

As shown in Figure 1, an engine speed sensor gap detection circuit includes a main control chip U1. The key point is that the voltage detection terminal of the main control chip U1 is connected with a speed signal voltage processing circuit, and the frequency detection of the main control chip U1 The terminal is connected with a speed signal pulse processing circuit, and the display terminal group of the main control chip U1 is connected with an LCD display.

Use the speed sensor signal to calculate and display the gap size. The user only needs to lead the engine speed signal to the engine speed sensor gap detection circuit and keep the engine at a certain speed to view the gap between the speed sensor and the magneto convex hull in real time. There is no need to open the engine casing, the detection operation is simple, the scheme is flexible, and it can be made into a portable instrument to provide efficient support for the pre-installation detection and after-sales work of the engine.

In this scheme, the voltage and frequency of the signal of the speed signal sensor are used as the basis, and the gap between the speed sensor and the magneto convex hull is calculated according to the data table and experience obtained from the experiment, and the gap is corrected by the temperature signal. , get the final theoretical gap value, and display the gap size, current speed, voltage and current temperature on the LCD1 display.

The speed signal voltage processing circuit is provided with a first operational amplifier IC1, the negative input terminal of the first operational amplifier IC1 is connected to one end of the third resistor R3, and the other end of the third resistor R3 is connected to the reference voltage;

The positive input terminal of the first operational amplifier IC1 is connected to one end of the second resistor R2, and the other end of the second resistor R2 is connected to the speed signal A end of the speed sensor;

A first resistor R1 is connected in series between the positive input terminal and the output terminal of the first operational amplifier IC1, and the output terminal is also connected to the voltage detection terminal of the main control chip U1.

The speed signal voltage processing circuit is used to detect the current voltage value.

The speed signal pulse processing circuit is provided with a second operational amplifier IC2, the negative input terminal of the second operational amplifier IC2 is connected to one end of the seventh resistor R7, and the other end of the seventh resistor R7 is connected to the rotational speed signal of the rotational speed sensor. On the A terminal, the A terminal of the speed signal is connected to the reference voltage through the fourth resistor R4;

The positive input terminal of the second operational amplifier IC2 is connected to one end of the eighth resistor R8, and the other end of the eighth resistor R8 is connected to the speed signal B end of the speed sensor, and the speed signal B end passes through the fifth resistor R5 connected to the reference voltage;

A sixth resistor R6 is connected in series between the positive input terminal and the output terminal of the second operational amplifier IC2, and the output terminal is also connected to the frequency detection terminal of the main control chip U1.

The speed signal pulse processing circuit is used to detect the current speed value.

A temperature sensor is connected to the temperature detection terminal of the main control chip U1.

The temperature sensor is used to detect the current temperature value.

The display terminal group of the main control chip U1 is composed of a first display terminal LCD1, a second display terminal LCD2, a third display terminal LCD3, and a fourth display terminal LCD4. The first display terminal LCD1, the second display terminal LCD2, The third display terminal LCD3 and the fourth display terminal LCD4 are connected to the same LCD display.

As shown in Figures 2 and 4, the loading detection method of the engine speed sensor gap detection circuit: its key lies in:

First, the speed signal A and the speed signal B of the engine speed sensor gap detection circuit are respectively connected to the first tap and the second tap of the speed sensor output coil;

Second, start the engine at idle speed;

The main control chip U1 is carried out according to the following steps:

Initialization, counter T1=0, T2=0, set the minimum no-load speed value speed, set the first set times and the second set times;

The period t1 of the first acquisition of the rotational speed signal;

After a delay for a period of time, the second acquisition speed signal cycle t2;

Judging whether the absolute value of the difference between t1 and t2 is within the allowable range, that is, judging whether the current rotation of the engine is stable;

If the absolute value of the difference between t1 and t2 is outside the allowable range, that is, the current rotation of the engine is not stable, it is necessary to return to the step of initialization, counter T1=0, and collect again;

If the absolute value of the difference between t1 and t2 is within the allowable range, that is, the current rotation of the engine is stable, then T1=T1+1;

Judging whether T1 is greater than the first set number of times;

If T1 is not greater than the first set number of times, return to the step of collecting the rotation speed signal cycle t1 for the first time, and collect again;

If T1 is greater than the first set number of times, the engine speed R is calculated based on the value of the second acquisition speed signal cycle t2;

Determine whether the engine speed R is greater than the minimum idle speed value speed;

If the engine speed R is not greater than the minimum idle speed value speed, then return to the initialization, the step of counter T1=0, and re-acquire again;

If the engine speed R is greater than the minimum idle speed value speed;

Collect and record the reading speed signal voltage Vc, collect the value of the speed signal period t3 again, and calculate the engine speed R;

T2=T2+1

Judging whether T2 is greater than the second set number of times;

If T2 is not greater than the second set number of times, then return to the step of collecting and recording the reading speed signal voltage Vc, collecting the value of the speed signal cycle t3 again, and calculating the engine speed R;

If T2 is greater than the second set number of times, the average values of Vc and R obtained in the second set number of times are respectively taken and recorded;

Collect the current temperature C of the engine;

Determine whether the current temperature C is greater than the upper limit temperature value c1, if the current temperature C is greater than the upper limit temperature value, then the temperature coefficient K=k1;

If the current temperature C is less than or equal to the upper limit temperature value, judge whether the current temperature C is greater than the lower limit temperature value c2,

If the current temperature C is between the lower limit temperature value and the upper limit temperature value, then the temperature coefficient K=k2;

If the current temperature C is less than or equal to the lower limit temperature value, then the temperature coefficient K=k3;

c1=30 degrees, c2=5 degrees, k1=1.05, k2=1, k3=0.94.

The value of the rotational speed signal voltage Vc is: Vc=Vc×K;

Call the speed-voltage-gap table, check the gap S between the speed sensor and the magnetic package by Vc and R;

The main control chip U1 drives the LCD display to display S, Vc and R;

Finish.

As shown in Figures 3 and 5, the no-load detection method of the engine speed sensor gap detection circuit: its key lies in:

First, the speed signal A and the speed signal B of the engine speed sensor gap detection circuit are respectively connected to the first tap and the second tap of the speed sensor output coil;

Secondly, turn the engine with no load; the engine is turned by external force such as pedal or manual.

The main control chip U1 is realized according to the following steps:

Initialize, set the minimum no-load speed value speed;

The period t1 of the first acquisition of the rotational speed signal;

After a delay for a period of time, the second acquisition speed signal cycle t2;

Determine whether t2 is greater than t1;

If t2 is greater than t1, then record t2, and read the speed signal voltage Vc, make t1=t2, and return to the step of judging whether t2 is greater than t1;

If t2 is not greater than t1, calculate the engine speed R by the value of t2;

Determine whether R is greater than speed;

If R is less than or equal to speed, return to the step of collecting the period t1 of the rotational speed signal for the first time;

If R is greater than speed, collect the current engine temperature C;

Determine whether the current temperature C is greater than the upper limit temperature value c1, if the current temperature C is greater than the upper limit temperature value, then the temperature coefficient K=k1;

If the current temperature C is less than or equal to the upper limit temperature value, judge whether the current temperature C is greater than the lower limit temperature value c2,

If the current temperature C is between the lower limit temperature value and the upper limit temperature value, then the temperature coefficient K=k2;

If the current temperature C is less than or equal to the lower limit temperature value, then the temperature coefficient K=k3;

c1=30 degrees, c2=5 degrees, k1=1.05, k2=1, k3=0.94.

The value of the rotational speed signal voltage Vc is: Vc=Vc×K;

Call the speed-voltage-gap table, check the gap S between the speed sensor and the magnetic package by Vc and R;

The main control chip U1 drives the LCD display to display S, Vc and R;

Return to the step of collecting the rotation speed signal period t1 for the first time.

Claims (5)

1. An engine speed sensor gap detection circuit, including a main control chip (U1), characterized in that the voltage detection terminal of the main control chip (U1) is connected to a speed signal voltage processing circuit, and the main control chip (U1) The frequency detection terminal is connected with a speed signal pulse processing circuit, and the display terminal group of the main control chip (U1) is connected with an LCD display. 2. The engine speed sensor gap detection circuit according to claim 1, characterized in that: the speed signal voltage processing circuit is provided with a first operational amplifier (IC1), and the negative input terminal of the first operational amplifier (IC1) is connected to At one end of the third resistor (R3), the other end of the third resistor (R3) is connected to the reference voltage; The positive input terminal of the first operational amplifier (IC1) is connected to one end of the second resistor (R2), and the other end of the second resistor (R2) is connected to the speed signal A terminal of the speed sensor; A first resistor (R1) is connected in series between the positive input terminal and the output terminal of the first operational amplifier (IC1), and the output terminal is also connected to the voltage detection terminal of the main control chip (U1). 3. The engine speed sensor gap detection circuit according to claim 1, characterized in that: the speed signal pulse processing circuit is provided with a second operational amplifier (IC2), and the negative input terminal of the second operational amplifier (IC2) is connected to At one end of the seventh resistor (R7), the other end of the seventh resistor (R7) is connected to the speed signal terminal A of the speed sensor, and the speed signal A terminal is connected to the reference voltage through the fourth resistor (R4); The positive input terminal of the second operational amplifier (IC2) is connected to one end of the eighth resistor (R8), and the other end of the eighth resistor (R8) is connected to the speed signal B end of the speed sensor, and the speed signal B The terminal is connected to the reference voltage through the fifth resistor (R5); A sixth resistor (R6) is connected in series between the positive input terminal and the output terminal of the second operational amplifier (IC2), and the output terminal is also connected to the frequency detection terminal of the main control chip (U1). 4. The engine speed sensor gap detection circuit according to claim 1, characterized in that: the temperature detection terminal of the main control chip (U1) is connected with a temperature sensor. 5. The engine speed sensor gap detection circuit according to claim 1, characterized in that: the display terminal group of the main control chip (U1) consists of a first display terminal (LCD1), a second display terminal (LCD2), a third display terminal The display terminal (LCD3), the fourth display terminal (LCD4), the first display terminal (LCD1), the second display terminal (LCD2), the third display terminal (LCD3), and the fourth display terminal (LCD4) are connected to on the same LCD display.

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