CN110685808B - Double-signal output induction circuit of accelerator pedal sensor and signal output control method thereof - Google Patents
Double-signal output induction circuit of accelerator pedal sensor and signal output control method thereof Download PDFInfo
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- CN110685808B CN110685808B CN201910947259.XA CN201910947259A CN110685808B CN 110685808 B CN110685808 B CN 110685808B CN 201910947259 A CN201910947259 A CN 201910947259A CN 110685808 B CN110685808 B CN 110685808B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K26/00—Arrangements or mounting of propulsion unit control devices in vehicles
- B60K26/02—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D11/106—Detection of demand or actuation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/30—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring angles or tapers; for testing the alignment of axes
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/51—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used
- H03K17/56—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices
- H03K17/687—Electronic switching or gating, i.e. not by contact-making and –breaking characterised by the components used by the use, as active elements, of semiconductor devices the devices being field-effect transistors
Abstract
The invention discloses a double-signal output induction circuit of an accelerator pedal sensor and a signal output control method thereof, belongs to the technical field of automobile accessories, and solves the problems of unreasonable design, high failure rate and high cost of the traditional double-signal output induction circuit of the sensor. The circuit mainly comprises a Hall chip sensing unit, a driving voltage division circuit unit, a first voltage output unit and a second voltage output unit. The invention has extremely low failure rate and long service life, breaks through the inertia design thinking of the accelerator pedal sensing circuit, and has extremely important significance in the technical field of sensor circuits and accelerator pedals.
Description
Technical Field
The invention belongs to the technical field of automobile accessories, and particularly relates to an accelerator pedal sensor double-signal output sensing circuit which outputs two paths of signals by one chip, effectively reduces the production cost and has extremely low failure rate of circuit design and a signal output control method thereof.
Background
At present, the sensor widely applied to an accelerator pedal is a non-contact double-signal output angular displacement sensor, and the design requirement is that two paths of voltage output signals are provided. The traditional sensor double-signal output sensing circuit is shown in the attached figure 1 of the specification, two paths of outputs need two Hall chips, and the two paths of outputs are output by two independent circuits. The traditional circuit design has the following defects: : 1. the Hall chip is relatively delicate, the input voltage higher than the withstand voltage value of the chip can cause the Hall chip to fail, the circuit design increases the probability of the circuit to break down, and the sensor can fail when any one output circuit of the two independent output circuits breaks down; 2. the circuit design has no overvoltage protection function, the voltage higher than 5V cannot be restrained, and the Hall chip is easy to damage; 3. the circuit needs two Hall chips, the price of the Hall chip is higher, and the production cost is high.
Disclosure of Invention
The invention aims to provide a double-signal output sensing circuit of an accelerator pedal sensor and a signal output control method thereof, wherein one chip outputs two paths of signals, the production cost is effectively reduced, and the failure rate of circuit design is extremely low.
The invention is realized by the following technical scheme:
a double-signal output sensing circuit of an accelerator pedal sensor comprises an input power supply, a Hall chip sensing unit, a driving voltage division circuit unit, a one-way voltage output unit and a two-way voltage output unit;
the input power supply provides working power supply for the Hall chip sensing unit and the one-driving-two voltage division circuit unit;
the Hall chip sensing unit outputs corresponding electric signals through a voltage output unit according to the stroke of the accelerator pedal;
the one-path voltage output unit divides the electric signal output by the one-path voltage dividing circuit unit according to a set proportion and outputs the divided electric signal through the two-path voltage output unit.
Preferably, the hall chip sensing unit comprises a hall chip U1, a capacitor C2 and a capacitor C1, wherein a V1 end of the hall chip is connected with the input power supply 1, a V1 end and a G1 end of the hall chip are connected with a capacitor C2 in parallel, and a G1 end and an O1 end of the hall chip are connected with a capacitor C1 in parallel; the terminal G1 is a ground terminal, and the terminal O1 is the one-way voltage output unit 4.
Preferably, the one-driving-two-voltage-dividing circuit unit comprises a voltage follower, a resistor R5 and a resistor R6, wherein one end of the resistor R5 is electrically connected with the O1 end of the hall chip U1, the other end of the resistor R5 is electrically connected with one end of the resistor R6, and the other end of the resistor R6 is grounded; a node between the other end of the resistor R5 and one end of the resistor R6 is electrically connected to an input end of a voltage follower, an output end of the voltage follower outputs an equivalent voltage along with the input end of the voltage follower, and an output end of the voltage follower is the two-way voltage output unit 5.
Preferably, the voltage follower is supplied with working power by the input power supply, and a Schottky tube D2 for preventing reverse connection is arranged between the Vcc input end of the voltage follower and the input power supply.
Preferably, the double-signal output sensing circuit of the accelerator pedal sensor further comprises a hall chip overvoltage protection module, wherein the hall chip overvoltage protection module comprises a sampling output unit and an MOS tube logic control circuit unit; the input end of the MOS tube logic control circuit unit is electrically connected with the sampling output unit, and the output end of the MOS tube logic control circuit unit is electrically connected with the Hall chip sensing unit; and the MOS tube logic control circuit unit is used for acquiring the electric signal on the sampling output unit, comparing the acquired electric signal with a set threshold value, and performing an execution action of judging whether to cut off the working power supply of the Hall chip sensing unit or not according to a comparison result.
Preferably, the MOS transistor logic control circuit unit includes a voltage comparator and a MOS transistor switch circuit; one input end of the voltage comparator is electrically connected with the sampling output unit and used for collecting an electric signal on the sampling output unit, the other input end of the voltage comparator keeps a fixed threshold value, the voltage comparator compares the sampling signal with the threshold value and controls the on-off of the MOS tube switching circuit according to the comparison result; the MOS tube switching circuit is electrically connected with the power input end of the Hall chip sensing unit and is used for controlling the on and off of a working power supply of the Hall chip sensing unit and protecting the Hall chip sensing unit.
Preferably, the MOS transistor switch circuit comprises a resistor R3, a diode D1, a resistor R4, a triode Q3, and a PMOS transistor Q2; the sampling output unit 7 comprises a resistor R1 and a resistor R2;
one end of the resistor R1 is electrically connected with the input power supply 1, and the other end of the resistor R1 is grounded through the resistor R2;
the voltage comparator is provided with working power by the input power supply 1, the Vcc end of the voltage comparator is also electrically connected with a diode D1 through a resistor R3, and the cathode end of the diode D1 is grounded; the positive input end of the voltage comparator is electrically connected with the anode end of the diode D1; a connecting node between the resistor R1 and the resistor R2 is electrically connected with a negative input end of the voltage comparator; the output end of the voltage comparator is electrically connected with the b pole of the triode Q3, the e pole of the triode Q3 is grounded, the c pole of the triode Q3 is electrically connected with the input power supply 1 through the resistor R4, the c pole of the triode Q3 is also electrically connected with the G end of the PMOS tube, the S end of the PMOS tube is electrically connected with the input power supply 1, and the D end of the PMOS tube is electrically connected with the power input end of the Hall chip induction unit 2.
A double-signal output control method of an accelerator pedal sensor double-signal output sensing circuit comprises the following steps,
providing working conditions for the Hall chip, converting the stroke of the accelerator pedal into a voltage signal by the Hall chip and then outputting the voltage signal, wherein the output signal is a voltage output unit 4; the one-path output voltage is divided by a driving voltage dividing circuit unit 3 according to a set proportion, and the divided output voltage signal is a two-path voltage output unit 5.
Preferably, the hall chip is further provided with a hall chip overvoltage protection module 6, and the hall chip overvoltage protection module 6 comprises a sampling output unit 7 and an MOS transistor logic control circuit unit 8; the overvoltage protection method of the Hall chip overvoltage protection module 6 comprises the following steps,
a sampling output unit 7 is electrically connected between the input power supply 1 and the working power supply input end of the Hall chip; one input end of the voltage comparator collects the voltage of the sampling output unit 7, and the other input end of the voltage comparator keeps a fixed threshold value; the voltage comparator compares the acquired voltage value with a fixed threshold, and when the input power supply 1 of the Hall chip is normal, the MOS tube logic control circuit unit 8 controls the input power supply 1 of the Hall chip to keep a connection state; when the input power supply 1 of the hall chip is in an overvoltage condition, the MOS tube logic control circuit unit 8 cuts off the input power supply 1 of the hall chip.
Compared with the prior art, the invention has the beneficial effects that:
the 'one-driving-two death key' circuit is an original circuit of the inventor, and the circuit design has the following advantages:
1. according to the invention, only one Hall chip is designed, the voltage output by the Hall chip is output in one way, the voltage division of the voltage division circuit is used for obtaining the output in two ways, and two independent circuits are bound into one circuit, so that the fault rate of the circuit is effectively reduced by half;
2. the invention only needs one Hall chip, the Hall chip has higher cost, the number of the Hall chips is halved, and the production cost of the whole circuit is effectively reduced;
3. according to the invention, the Hall chip is used as the most vulnerable component, so long as the service life of the Hall chip is ensured, the service life of the whole sensor can be ensured, the protection function of the Hall chip is realized by skillfully utilizing an MOS tube logic control circuit, and the circuit design is simple and ingenious;
4. the design method of the 'one-to-two' circuit is ingenious, breaks through the thought of the sensor double-signal output inertia design, and effectively reduces the product cost; the 'death key' of the invention means that the service life of the whole sensor can be controlled as long as the service life of one Hall chip is effectively controlled, and the ingenious design method also breaks through the thought of the sensor double-signal output inertia design; the method has extremely important significance in the technical field of sensor circuits and the technical field of accelerator pedals.
Drawings
FIG. 1 is a schematic diagram of a conventional dual signal output sensing circuit of an accelerator pedal sensor;
FIG. 2 is a system block diagram of embodiment 1 and embodiment 2 of the invention;
FIG. 3 is a schematic circuit diagram of embodiments 1 and 2 of the present invention;
FIG. 4 is a system block diagram of embodiment 3 of the present invention;
fig. 5 is a schematic circuit diagram according to embodiment 3 of the present invention.
In the figure: 1. inputting a power supply; 2. a Hall chip sensing unit; 3. one driving two voltage division circuit unit; 4. one path of voltage output unit; 5. two-way voltage output unit; 6. the Hall chip overvoltage protection module; 7. a sampling output unit; and 8, a MOS tube logic control circuit unit.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
a double-signal output sensing circuit of an accelerator pedal sensor comprises an input power supply 1, a Hall chip sensing unit 2, a two-way voltage division circuit unit 3, a one-way voltage output unit 4 and a two-way voltage output unit 5;
the input power supply 1 provides a working power supply for the Hall chip sensing unit 2 and the one-driving-two-voltage-dividing circuit unit 3;
the Hall chip sensing unit 2 outputs a corresponding electric signal through a voltage output unit 4 according to the stroke of the accelerator pedal;
the one-path voltage output unit 4 divides the electric signal output by the one-path voltage dividing circuit unit 3 according to a set proportion and outputs the divided electric signal through the two-path voltage output unit 5.
Preferably, the hall chip sensing unit 2 comprises a hall chip U1, a capacitor C2 and a capacitor C1, wherein a V1 end of the hall chip is connected with the input power supply 1, a V1 end and a G1 end of the hall chip are connected with a capacitor C2 in parallel, and a G1 end and an O1 end of the hall chip are connected with a capacitor C1 in parallel; the terminal G1 is a ground terminal, and the terminal O1 is the one-way voltage output unit 4.
Preferably, the one-driving-two voltage division circuit unit 3 comprises a voltage follower, a resistor R5 and a resistor R6, wherein one end of the resistor R5 is electrically connected with the O1 end of the hall chip U1, the other end of the resistor R5 is electrically connected with one end of the resistor R6, and the other end of the resistor R6 is grounded; a node between the other end of the resistor R5 and one end of the resistor R6 is electrically connected to an input end of a voltage follower, an output end of the voltage follower outputs an equivalent voltage along with the input end of the voltage follower, and an output end of the voltage follower is the two-way voltage output unit 5.
Preferably, the voltage follower is supplied with working power by the input power supply 1, and a Schottky tube D2 for anti-reverse protection is arranged between the Vcc input end of the voltage follower and the input power supply 1.
Preferably, the double-signal output sensing circuit of the accelerator pedal sensor further comprises a hall chip overvoltage protection module 6, wherein the hall chip overvoltage protection module 6 comprises a sampling output unit 7 and an MOS tube logic control circuit unit 8; the input end of the MOS tube logic control circuit unit 8 is electrically connected with the sampling output unit 7, and the output end of the MOS tube logic control circuit unit is electrically connected with the Hall chip sensing unit 2; the MOS tube logic control circuit unit 8 is used for collecting the electric signal on the sampling output unit 7, comparing the collected electric signal with a set threshold value, and performing an execution action of judging whether to cut off the working power supply of the Hall chip induction unit 2 or not according to a comparison result.
Preferably, the MOS transistor logic control circuit unit 8 includes a voltage comparator and a MOS transistor switch circuit; one input end of the voltage comparator is electrically connected with the sampling output unit 7 and is used for collecting an electric signal on the sampling output unit 7, the other input end of the voltage comparator keeps a fixed threshold value, the voltage comparator compares the sampling signal with the threshold value and controls the on-off of the MOS tube switching circuit according to the comparison result; the MOS tube switching circuit is electrically connected with the power input end of the Hall chip sensing unit 2 and is used for controlling the on and off of the working power supply of the Hall chip sensing unit 2 and protecting the Hall chip sensing unit 2.
Preferably, the MOS transistor switch circuit comprises a resistor R3, a diode D1, a resistor R4, a triode Q3, and a PMOS transistor Q2; the sampling output unit 7 comprises a resistor R1 and a resistor R2;
one end of the resistor R1 is electrically connected with the input power supply 1, and the other end of the resistor R1 is grounded through the resistor R2;
the voltage comparator is provided with working power by the input power supply 1, the Vcc end of the voltage comparator is also electrically connected with a diode D1 through a resistor R3, and the cathode end of the diode D1 is grounded; the positive input end of the voltage comparator is electrically connected with the anode end of the diode D1; a connecting node between the resistor R1 and the resistor R2 is electrically connected with a negative input end of the voltage comparator; the output end of the voltage comparator is electrically connected with the b pole of the triode Q3, the e pole of the triode Q3 is grounded, the c pole of the triode Q3 is electrically connected with the input power supply 1 through the resistor R4, the c pole of the triode Q3 is also electrically connected with the G end of the PMOS tube, the S end of the PMOS tube is electrically connected with the input power supply 1, and the D end of the PMOS tube is electrically connected with the power input end of the Hall chip induction unit 2.
A double-signal output control method of an accelerator pedal sensor double-signal output sensing circuit comprises the following steps,
providing working conditions for the Hall chip, converting the stroke of the accelerator pedal into a voltage signal by the Hall chip and then outputting the voltage signal, wherein the output signal is a voltage output unit 4; the one-path output voltage is divided by a driving voltage dividing circuit unit 3 according to a set proportion, and the divided output voltage signal is a two-path voltage output unit 5.
Preferably, the hall chip is further provided with a hall chip overvoltage protection module 6, and the hall chip overvoltage protection module 6 comprises a sampling output unit 7 and an MOS transistor logic control circuit unit 8; the overvoltage protection method of the Hall chip overvoltage protection module 6 comprises the following steps,
a sampling output unit 7 is electrically connected between the input power supply 1 and the working power supply input end of the Hall chip; one input end of the voltage comparator collects the voltage of the sampling output unit 7, and the other input end of the voltage comparator keeps a fixed threshold value; the voltage comparator compares the acquired voltage value with a fixed threshold, and when the input power supply 1 of the Hall chip is normal, the MOS tube logic control circuit unit 8 controls the input power supply 1 of the Hall chip to keep a connection state; when the input power supply 1 of the hall chip is in an overvoltage condition, the MOS tube logic control circuit unit 8 cuts off the input power supply 1 of the hall chip.
Example 1:
as shown in fig. 2 of the accompanying drawings of the specification, the present embodiment includes an input power supply 1, and further includes a hall chip sensing unit 2, a driving voltage dividing circuit unit 3, a first voltage output unit 4, and a second voltage output unit 5; the input power supply 1 provides a working power supply for the Hall chip sensing unit 2 and the one-driving-two-voltage-dividing circuit unit 3; the Hall chip sensing unit 2 outputs a corresponding electric signal through a voltage output unit 4 according to the stroke of the accelerator pedal; the one-way voltage output unit 4 divides the electric signal output by the one-way voltage dividing circuit unit 3 according to a set proportion and outputs the divided electric signal through the two-way voltage output unit 5.
As shown in fig. 3 of the accompanying drawings of the specification, the hall chip sensing unit 2 includes a hall chip U1, a capacitor C2, and a capacitor C1, wherein a V1 end of the hall chip is connected with the input power supply 1, two ends of a V1 end and a G1 end of the hall chip are connected with a capacitor C2 in parallel, and a G1 end and an O1 end of the hall chip are connected with a capacitor C1 in parallel; the G1 terminal is a ground terminal, and the O1 terminal is a voltage output unit 4.
The one-driving-two-voltage-dividing circuit unit 3 comprises a voltage follower, a resistor R5 and a resistor R6, wherein the voltage follower is a universal operational amplifier U2, one end of the resistor R5 is electrically connected with an O1 end of a Hall chip U1, the other end of the resistor R5 is electrically connected with one end of a resistor R6, and the other end of the resistor R6 is grounded; the node between the other end of the resistor R5 and one end of the resistor R6 is electrically connected with the 1IN + end of the general operational amplifier U2, the output end 1OUT of the general operational amplifier U2 is electrically connected with the 1 IN-end of the general operational amplifier U2, and the output end 1OUT of the general operational amplifier U2 outputs equal voltage along with the 1IN + end. The output end 1OUT of the general operational amplifier U2 is the two-way voltage output unit 5.
The double-signal input method comprises the steps of providing working conditions for a Hall chip, converting the stroke of an accelerator pedal into a voltage signal by the Hall chip and then outputting the voltage signal, wherein the output signal is a voltage output unit 4; the one-path output voltage is divided by a driving voltage dividing circuit unit 3 according to a set proportion, and the divided output voltage signal is a two-path voltage output unit 5.
The working principle of the embodiment is as follows: the input power supply 1, the capacitor C2 and the capacitor C1 provide working conditions for the Hall chip. The Hall chip outputs a voltage signal from an O1 end of the Hall chip according to the stepping stroke of the accelerator pedal, and the output signal is one path of output signal; the output signal of the path is divided by the resistors R5 and R6, and then the divided signal is output by the following voltage device, which is a general operational amplifier U2 in the embodiment, and two paths of signals are output by the 1OUT output terminal of the general operational amplifier U2. According to the design requirement of an accelerator pedal sensor, one path of signal output is normally twice as much as two paths of signal output, and the resistance values of a normal resistor R5 and a resistor R6 are generally equal.
In the embodiment, only one Hall chip is designed, the voltage output by the Hall chip is output in one way, the voltage division of the voltage division circuit is performed on the output in two ways, two independent circuits are bound into one circuit, and the fault rate of the circuit is effectively reduced by half; the embodiment only needs one Hall chip, the cost of the Hall chip is higher, the number of the Hall chips is halved, and the production cost of the whole circuit is effectively reduced; in the design of one-driving-two, the Hall chip is used as the most easily damaged component, and the service life of the whole sensor can be ensured as long as the service life of the Hall chip is ensured; the design method of the 'one-to-two' circuit is ingenious, breaks through the thought of the sensor double-signal output inertia design, and effectively reduces the product cost.
Example 2:
in this embodiment, on the basis of embodiment 1, the voltage follower is supplied with working power from the input power supply 1, and a schottky diode D2 for protection against reverse connection is provided in the electrical connection between the Vcc input terminal of the voltage follower and the input power supply 1. The anode of the Schottky tube D2 is electrically connected with an input power supply, and the cathode is electrically connected with the Vcc end of the general operational amplifier.
Example 3:
the embodiment comprises an input power supply 1, a Hall chip sensing unit 2, a driving voltage division circuit unit 3, a one-way voltage output unit 4 and a two-way voltage output unit 5; the input power supply 1 provides a working power supply for the Hall chip sensing unit 2 and the one-driving-two-voltage-dividing circuit unit 3; the Hall chip sensing unit 2 outputs a corresponding electric signal through a voltage output unit 4 according to the stroke of the accelerator pedal; the one-way voltage output unit 4 divides the electric signal output by the one-way voltage dividing circuit unit 3 according to a set proportion and outputs the divided electric signal through the two-way voltage output unit 5. The circuit also comprises a Hall chip overvoltage protection module 6, wherein the Hall chip overvoltage protection module 6 comprises a sampling output unit 7 and an MOS tube logic control circuit unit 8; the input end of the MOS tube logic control circuit unit 8 is electrically connected with the sampling output unit 7, and the output end of the MOS tube logic control circuit unit is electrically connected with the Hall chip sensing unit 2; the MOS tube logic control circuit unit 8 is used for collecting the electric signal on the sampling output unit 7, comparing the collected electric signal with a set threshold value, and performing an execution action of judging whether to cut off the working power supply of the Hall chip induction unit 2 or not according to a comparison result. The MOS tube logic control circuit unit 8 comprises a voltage comparator and an MOS tube switch circuit; one input end of the voltage comparator is electrically connected with the sampling output unit 7 and is used for collecting an electric signal on the sampling output unit 7, the other input end of the voltage comparator keeps a fixed threshold value, the voltage comparator compares the sampling signal with the threshold value and controls the on-off of the MOS tube switching circuit according to the comparison result; the MOS tube switching circuit is electrically connected with the power input end of the Hall chip sensing unit 2 and is used for controlling the on and off of the working power supply of the Hall chip sensing unit 2 and protecting the Hall chip sensing unit 2. The invention skillfully utilizes the MOS tube logic control circuit to realize the protection function of the Hall chip, and the circuit design is simple and skillful;
the embodiment provides working conditions for the Hall chip, the Hall chip converts the travel of the accelerator pedal into a voltage signal and outputs the voltage signal, and the output signal is a voltage output unit 4; the one-path output voltage is divided by a driving voltage dividing circuit unit 3 according to a set proportion, and the divided output voltage signal is a two-path voltage output unit 5. The Hall chip is also provided with a Hall chip overvoltage protection module 6, and the Hall chip overvoltage protection module 6 comprises a sampling output unit 7 and an MOS tube logic control circuit unit 8; the overvoltage protection method of the Hall chip overvoltage protection module 6 comprises the steps that a sampling output unit 7 is electrically connected between an input power supply 1 and the input end of a working power supply of the Hall chip; one input end of the voltage comparator collects the voltage of the sampling output unit 7, and the other input end of the voltage comparator keeps a fixed threshold value; the voltage comparator compares the acquired voltage value with a fixed threshold, and when the input power supply 1 of the Hall chip is normal, the MOS tube logic control circuit unit 8 controls the input power supply 1 of the Hall chip to keep a connection state; when the input power supply 1 of the hall chip has an overvoltage condition, the MOS transistor logic control circuit unit 8 cuts off the input power supply 1 of the hall chip.
The voltage comparator and the voltage follower of the embodiment are both realized by the universal operational amplifier, that is, the voltage comparator and the voltage follower are actually the same device, different pins realize different functions, taking the universal operational amplifier 2904 as an example, the three pins, namely 1IN +, 1IN-, 1OUT, of the universal operational amplifier U2 realize the function of the voltage follower, and the three pins, namely 2OUT, 2IN-, 2IN + of the universal operational amplifier U2 realize the function of the voltage comparator.
As shown in fig. 3 of the accompanying drawings of the specification, the hall chip sensing unit 2 includes a hall chip U1, a capacitor C2, and a capacitor C1, wherein a V1 end of the hall chip is connected with the input power supply 1, two ends of a V1 end and a G1 end of the hall chip are connected with a capacitor C2 in parallel, and a G1 end and an O1 end of the hall chip are connected with a capacitor C1 in parallel; the G1 terminal is a ground terminal, and the O1 terminal is a voltage output unit 4.
The one-driving-two-voltage-dividing circuit unit 3 comprises a voltage follower, a resistor R5 and a resistor R6, wherein the voltage follower is a universal operational amplifier U2, one end of the resistor R5 is electrically connected with an O1 end of a Hall chip U1, the other end of the resistor R5 is electrically connected with one end of a resistor R6, and the other end of the resistor R6 is grounded; the node between the other end of the resistor R5 and one end of the resistor R6 is electrically connected with the 1IN + end of the general operational amplifier U2, the output end 1OUT of the general operational amplifier U2 is electrically connected with the 1 IN-end of the general operational amplifier U2, and the output end 1OUT of the general operational amplifier U2 outputs equal voltage along with the 1IN + end. The output end 1OUT of the general operational amplifier U2 is the two-way voltage output unit 5.
The MOS tube switching circuit comprises a resistor R3, a diode D1, a resistor R4, a triode Q3 and a PMOS tube Q2; the sampling output unit 7 comprises a resistor R1 and a resistor R2;
one end of the resistor R1 is electrically connected with the input power supply 1, and the other end of the resistor R1 is grounded through a resistor R2;
the voltage comparator is also a universal operational amplifier U2, which is provided with a working power supply by an input power supply 1, the Vcc end of the voltage comparator is also electrically connected with a diode D1 through a resistor R3, and the cathode end of the diode D1 is grounded; the positive input end Vcc of the voltage comparator is electrically connected with the anode end of the diode D1; the connecting node between the resistor R1 and the resistor R2 is electrically connected with the 2 IN-end of the voltage comparator; the output end 2OUT end of the voltage comparator is electrically connected with the b pole of the triode Q3, the e pole of the triode Q3 is grounded, the c pole of the triode Q3 is electrically connected with the input power supply 1 through the resistor R4, the c pole of the triode Q3 is also electrically connected with the G end of the PMOS tube, the S end of the PMOS tube is electrically connected with the input power supply 1, and the D end of the PMOS tube is electrically connected with the power input end of the Hall chip induction unit 2.
The netout, net5, net6 and net7 in the drawings of the specification are all network numbers.
The working principle of the embodiment is as follows: when the input power supply has no overvoltage condition, the voltage signal collected by the net6 is lower than the voltage value of the net5, namely the positive end of the universal operational amplifier U2 is higher than the negative end, at the moment, the universal operational amplifier U2 outputs high level, the switch triode Q3 is switched on, the G end of the PMOS tube is pulled down, the S end of the PMOS tube is higher than the G end, the switching condition is met, the PMOS tube is switched on, the V1 end of the Hall chip is electrified, the Hall chip works normally, and the voltage signal is output through one-path output and two-path output respectively.
When an overvoltage condition occurs to an input power supply, a voltage signal acquired by the net6 is higher than a voltage value of the net5, namely the positive end of the universal operational amplifier U2 is lower than the negative end, the universal operational amplifier U2 outputs low level at the moment, the switching triode Q3 is turned off, at the moment, the G end of the PMOS tube is higher than the S end of the PMOS tube, the conduction condition is not met, the PMOS tube is turned on and off, and the V1 end of the Hall chip cannot normally work due to power failure.
In the embodiment, only one Hall chip is designed, the voltage output by the Hall chip is output in one way, the voltage division of the voltage division circuit is performed on the output in two ways, two independent circuits are bound into one circuit, and the fault rate of the circuit is effectively reduced by half; the embodiment only needs one Hall chip, the cost of the Hall chip is higher, the number of the Hall chips is halved, and the production cost of the whole circuit is effectively reduced; in the design of one-driving-two, the Hall chip is used as the most vulnerable component, so long as the service life of the Hall chip is ensured, the service life of the whole sensor can be ensured, the protection function of the Hall chip is realized by skillfully utilizing an MOS tube logic control circuit, and the circuit design is simple and ingenious; the design method of the 'one-to-two' circuit is ingenious, breaks through the thought of sensor double-signal output inertia design, and effectively reduces the product cost; the 'death key' of the invention means that the service life of the whole sensor can be controlled as long as the service life of one Hall chip is effectively controlled, and the ingenious design method also breaks through the thought of the sensor double-signal output inertia design; the method has extremely important significance in the technical field of sensor circuits and the technical field of accelerator pedals.
Therefore, the invention is not to be limited to the specific embodiments, but rather, all equivalent changes and modifications in the shapes, structures, characteristics and spirit of the invention are intended to be included within the scope of the appended claims.
Claims (9)
1. The utility model provides an accelerator pedal sensor dual signal output induction circuit, includes input power supply, its characterized in that: the Hall chip sensing unit, the one-driving-two voltage division circuit unit, the one-path voltage output unit and the two-path voltage output unit are further included;
the input power supply provides working power supply for the Hall chip sensing unit and the one-driving-two voltage division circuit unit;
the Hall chip sensing unit outputs corresponding electric signals through a voltage output unit according to the stroke of the accelerator pedal;
the one-path voltage output unit divides the electric signal output by the one-path voltage dividing circuit unit according to a set proportion and outputs the divided electric signal through the two-path voltage output unit.
2. The dual signal output sensing circuit of an accelerator pedal sensor as claimed in claim 1, wherein: the Hall chip sensing unit comprises a Hall chip U1, a capacitor C2 and a capacitor C1, wherein a V1 end of the Hall chip U1 is connected with the input power supply, a V1 end and two ends of a G1 end of the Hall chip U1 are connected with the capacitor C2 in parallel, and a G1 end and an O1 end of the Hall chip U1 are connected with the capacitor C1 in parallel; the G1 terminal is the ground terminal, and the O1 terminal is the one-way voltage output unit.
3. The dual signal output sensing circuit of an accelerator pedal sensor as claimed in claim 2, wherein: the one-driving-two-voltage-dividing circuit unit comprises a voltage follower, a resistor R5 and a resistor R6, one end of the resistor R5 is electrically connected with the O1 end of the Hall chip U1, the other end of the resistor R5 is electrically connected with one end of the resistor R6, and the other end of the resistor R6 is grounded; and a node between the other end of the resistor R5 and one end of the resistor R6 is electrically connected with an input end of a voltage follower, an output end of the voltage follower outputs equivalent voltage along with the input end of the voltage follower, and an output end of the voltage follower is the two-path voltage output unit.
4. The dual signal output sensing circuit of an accelerator pedal sensor as claimed in claim 3, wherein: the voltage follower is provided with a working power supply by the input power supply, and a Schottky tube D2 which plays a role in reverse connection protection is arranged between the Vcc input end of the voltage follower and the input power supply.
5. The dual signal output sensing circuit of an accelerator pedal sensor as claimed in claim 1, wherein: the double-signal output induction circuit of the accelerator pedal sensor further comprises a Hall chip overvoltage protection module, wherein the Hall chip overvoltage protection module comprises a sampling output unit and an MOS tube logic control circuit unit; the input end of the MOS tube logic control circuit unit is electrically connected with the sampling output unit, and the output end of the MOS tube logic control circuit unit is electrically connected with the Hall chip sensing unit; and the MOS tube logic control circuit unit is used for acquiring the electric signal on the sampling output unit, comparing the acquired electric signal with a set threshold value, and performing an execution action of judging whether to cut off the working power supply of the Hall chip sensing unit or not according to a comparison result.
6. The dual signal output sensing circuit of an accelerator pedal sensor as claimed in claim 5, wherein: the MOS tube logic control circuit unit comprises a voltage comparator and an MOS tube switch circuit; one input end of the voltage comparator is electrically connected with the sampling output unit and used for collecting an electric signal on the sampling output unit, the other input end of the voltage comparator keeps a fixed threshold value, the voltage comparator compares the sampling signal with the threshold value and controls the on-off of the MOS tube switching circuit according to the comparison result; the MOS tube switching circuit is electrically connected with the power input end of the Hall chip sensing unit and is used for controlling the on and off of a working power supply of the Hall chip sensing unit and protecting the Hall chip sensing unit.
7. The dual signal output sensing circuit of an accelerator pedal sensor as claimed in claim 6, wherein: the MOS tube switching circuit comprises a resistor R3, a diode D1, a resistor R4, a triode Q3 and a PMOS tube Q2; the sampling output unit comprises a resistor R1 and a resistor R2;
one end of the resistor R1 is electrically connected with the input power supply, and the other end of the resistor R1 is grounded through the resistor R2;
the voltage comparator is provided with working power supply by the input power supply, the Vcc end of the voltage comparator is also electrically connected with a diode D1 through a resistor R3, and the cathode end of the diode D1 is grounded; the positive input end of the voltage comparator is electrically connected with the anode end of the diode D1; a connecting node between the resistor R1 and the resistor R2 is electrically connected with a negative input end of the voltage comparator; the output of voltage comparator and triode Q3 ' S b utmost point electric connection, triode Q3 ' S e utmost point ground connection, triode Q3 ' S c utmost point through resistance R4 with input power supply electric connection, triode Q3 ' S c utmost point still is connected with the G end electric connection of PMOS pipe, the S end of PMOS pipe with input power supply electric connection, the D end of PMOS pipe with hall chip induction element ' S power input end electric connection.
8. A double-signal output control method of a double-signal output sensing circuit of an accelerator pedal sensor is characterized by comprising the following steps,
providing working conditions for the Hall chip, converting the stroke of the accelerator pedal into a voltage signal by the Hall chip and then outputting the voltage signal, wherein the output signal is a voltage output unit; the output voltage is divided by a driving voltage dividing circuit unit according to a set proportion, and the divided output voltage signal is a two-way voltage output unit.
9. The dual-signal output control method of the accelerator pedal sensor dual-signal output sensing circuit according to claim 8, characterized in that: the Hall chip is also provided with a Hall chip overvoltage protection module, and the Hall chip overvoltage protection module comprises a sampling output unit and an MOS tube logic control circuit unit; the overvoltage protection method of the Hall chip overvoltage protection module comprises the steps that a sampling output unit is electrically connected between an input power supply and the input end of a working power supply of a Hall chip; one input end of the voltage comparator collects the voltage of the sampling output unit, and the other input end of the voltage comparator keeps a fixed threshold value; the voltage comparator compares the acquired voltage value with a fixed threshold value, and when the input power supply of the Hall chip is normal, the MOS tube logic control circuit unit controls the input power supply of the Hall chip to keep a connection state; when the input power supply of the Hall chip is in an overvoltage condition, the MOS tube logic control circuit unit cuts off the input power supply of the Hall chip.
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| CN201910947259.XA CN110685808B (en) | 2019-09-30 | 2019-09-30 | Double-signal output induction circuit of accelerator pedal sensor and signal output control method thereof |
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| CN201910947259.XA CN110685808B (en) | 2019-09-30 | 2019-09-30 | Double-signal output induction circuit of accelerator pedal sensor and signal output control method thereof |
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| JPS608702A (en) * | 1983-06-29 | 1985-01-17 | Isuzu Motors Ltd | Signal processor for accelerator pedal sensor |
| KR100828267B1 (en) * | 2007-02-14 | 2008-05-07 | 주식회사 현대오토넷 | Apparatus and method for improvement efficiency of electric throttle controller module at diesel engine |
| CN102269060A (en) * | 2011-07-05 | 2011-12-07 | 昆山力久新能源汽车技术有限公司 | Safety handling method of electronic accelerator signals for automobile |
| CN103660936A (en) * | 2012-09-26 | 2014-03-26 | 株式会社电装 | Accelerator apparatus |
| CN206681853U (en) * | 2017-04-14 | 2017-11-28 | 重庆瓯福安电子有限公司 | Electronic automobile accelerator master control borad assembly |
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2019
- 2019-09-30 CN CN201910947259.XA patent/CN110685808B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS608702A (en) * | 1983-06-29 | 1985-01-17 | Isuzu Motors Ltd | Signal processor for accelerator pedal sensor |
| KR100828267B1 (en) * | 2007-02-14 | 2008-05-07 | 주식회사 현대오토넷 | Apparatus and method for improvement efficiency of electric throttle controller module at diesel engine |
| CN102269060A (en) * | 2011-07-05 | 2011-12-07 | 昆山力久新能源汽车技术有限公司 | Safety handling method of electronic accelerator signals for automobile |
| CN103660936A (en) * | 2012-09-26 | 2014-03-26 | 株式会社电装 | Accelerator apparatus |
| CN206681853U (en) * | 2017-04-14 | 2017-11-28 | 重庆瓯福安电子有限公司 | Electronic automobile accelerator master control borad assembly |
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Denomination of invention: Dual signal output sensing circuit of accelerator pedal sensor and its signal output control method Effective date of registration: 20221011 Granted publication date: 20220301 Pledgee: Yangzhou Branch of Bank of Jiangsu Co.,Ltd. Pledgor: Yangzhou Dongbo Electronic Technology Co.,Ltd. Registration number: Y2022980018013 |
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