A pedal sensor circuit
By designing a pedal sensor circuit that includes a Hall sensor, an LDO chip, and a photoelectric switch, the problem that existing pedal sensor circuits cannot output idle and non-idle signals is solved, enabling the provision of multiple signals to external control modules and meeting the needs of vehicle intelligent systems.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- DONGFENG MORSE CONTROL ROPE SHANGHAI
- Filing Date
- 2025-06-04
- Publication Date
- 2026-05-29
AI Technical Summary
Existing pedal sensor circuits can only output a single pedal position signal, which cannot meet the vehicle's intelligent system's need to perceive the engine's idling/non-idling state.
A pedal sensor circuit was designed, which includes components such as a Hall sensor, an LDO chip, a normally open photoelectric switch, and a normally closed photoelectric switch. By combining and outputting pedal position signals, idle speed signals, and non-idle speed signals, it meets the multi-functional requirements of vehicle intelligent systems.
It enables the provision of pedal position signals to external control modules while simultaneously outputting idle and non-idle speed signals, thus meeting the diverse application scenarios of vehicle intelligent systems.
Smart Images
Figure CN224305751U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of pedal sensor circuit technology, and in particular relates to a pedal sensor circuit. Background Technology
[0002] Currently, mainstream pedal sensor circuit designs only support single-function position signal output, meaning they can only provide the ECU with continuous position signals corresponding to pedal travel (such as "pedal depressed 20%" or "50%"). However, with the increasing intelligence of vehicles, other subsystems (such as automatic start-stop systems, transmission control units, onboard energy management modules, and even the human-machine interface systems of smart cockpits) have an increasing need to sense the engine's "idle / non-idle state," and existing pedal sensor circuits cannot meet this demand. Utility Model Content
[0003] Based on this, a pedal sensor circuit is provided to address the aforementioned technical problems.
[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:
[0005] A pedal sensor circuit, characterized in that it includes a Hall sensor U1, an LDO chip U6, a normally open photoelectric switch U4, a normally closed photoelectric switch U3, a transistor Q1, and a Hall sensor U2. The power supply terminal of the Hall sensor U1 is connected to a power supply terminal, and its output terminal is connected to an external control module. The power supply terminal of the LDO chip U6 is connected to the power supply terminal, and its output terminal is connected to the base of the transistor Q1. The positive control terminal of the normally open photoelectric switch U4 is connected to the power supply terminal, and its negative control terminal is connected to the positive control terminal of the normally closed photoelectric switch U3. The negative control terminal of the normally closed photoelectric switch U3 is connected to the collector of the transistor Q1. One load terminal of each of the normally open and normally closed photoelectric switches U4 and U3 is connected to a non-idle signal output terminal and an idle signal output terminal, respectively. The other load terminal of each of the normally open and normally closed photoelectric switches U4 and U3 is grounded. The emitter of the transistor Q1 is grounded. The power supply terminal of the Hall sensor U2 is connected to the power supply terminal, and its output terminal is connected to the output terminal of the LDO chip U6 via a resistor R8.
[0006] This invention can not only provide pedal position signals to external control modules, but also output idle speed signals and non-idle speed signals, thus meeting the new application scenarios of vehicle intelligence. Attached Figure Description
[0007] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments:
[0008] Figure 1 A schematic diagram of a pedal sensor circuit provided in an embodiment of this application;
[0009] Figure 2 A schematic diagram of the upper half of a pedal sensor circuit provided in an embodiment of this application;
[0010] Figure 3 A schematic diagram of the lower half of a pedal sensor circuit provided in an embodiment of this application;
[0011] Figure 4 This is a schematic diagram of a pedal sensor circuit that outputs idle speed signals and non-idle speed signals, provided in an embodiment of this application. Detailed Implementation
[0012] like Figure 2 and Figure 3 As shown, this application embodiment provides a pedal sensor circuit, including a power supply terminal PC, a ground terminal PB, a pedal position signal output terminal PA, an idle speed signal output terminal PE, a common terminal PF, a non-idle speed signal output terminal PD, an LDO chip U5, an NMOS transistor Q4, a PMOS transistor Q3, a Schottky diode D9, a transistor Q2, a Hall sensor U1, an LDO chip U6, a normally open photoelectric switch U4, a normally closed photoelectric switch U3, a transistor Q1, and a Hall sensor U2.
[0013] The power supply terminal PC is grounded via filter capacitor C6 to filter the input power supply signal. The signal is then split into two paths: the first path connects to the power supply terminal VCC of the LDO chip U5 and the cathode of the Zener diode D10 via resistor R2; the second path connects to the source of the PMOS transistor Q3. The ground terminal PB is grounded.
[0014] The positive terminal of Zener diode D10 is grounded, which helps to stabilize the voltage at the power supply terminal VCC of LDO chip U5.
[0015] The ground terminal GND of LDO chip U5 is grounded, and the output terminal RESET is connected to the gate of NMOS transistor Q4. The source of NMOS transistor Q4 is grounded, and the drain is connected to the gate of PMOS transistor Q3.
[0016] like Figure 2 and Figure 3 As shown, the drain of PMOS transistor Q3 is split into four paths at point A. One path is connected to the power supply terminal VDD of Hall sensor U1, another path is connected to the power supply terminal VCC of LDO chip U6, another path is connected to the power supply terminal VDD of Hall sensor U2, and the last path is connected to the control positive terminal of normally open photoelectric switch U4.
[0017] The negative terminal of Schottky diode D9 is connected to the second path of power supply PC, the positive terminal is connected to the base of transistor Q2, the emitter of transistor Q2 is grounded, and the collector is connected to the gate of NMOS transistor Q4.
[0018] The filtered and regulated power supply voltage is input to the LDO chip U5, and then outputs a stable voltage to the gate of the NMOS transistor Q4, causing Q4 to conduct. The conduction of Q4 causes the PMOS transistor Q3 to conduct, thereby enabling the power supply PC to supply power to the Hall sensor U1, the LDO chip U6, and the Hall sensor U2.
[0019] The ground terminal GND of Hall sensor U1 is grounded, and its output terminal OUT is connected to an external control module (such as an ECU) via the pedal position signal output terminal PA, so that the external control module can collect the pedal position signal.
[0020] A resistor R2 is connected between the power supply PC and the power supply VCC of the LDO chip U5 to limit the current and prevent the VCC pin of the LDO chip U5 from burning out due to excessive current.
[0021] Resistors R1 and R9 form a voltage divider circuit to provide the turn-on voltage for Q4.
[0022] Resistor R10 is used to provide a discharge path for Q3 when the power is off.
[0023] Capacitor C3 provides filtering for the VDD terminal of U1 and the VDS terminal of Q3.
[0024] Capacitor C2 and resistor R7 form the RC filter circuit at the output of U1.
[0025] Thermistor T2 provides overcurrent protection for the output of U1. TVS diode D6 is used to prevent transient pulse interference at the output of U1. D11 is a Zener diode. When the voltage at the output of U1 is lower than the reverse breakdown voltage of D11 (e.g., 6.2V), D11 is in an open state and has no effect. When the voltage at the output of U1 is higher than the reverse breakdown voltage, D11 clamps the voltage at the reverse breakdown voltage, thereby protecting the output of U1 from high voltage damage.
[0026] The ground terminal GND of LDO chip U6 is grounded, and the output terminal RESET is connected to the base of transistor Q1. The control negative terminal of normally open photoelectric switch U4 is connected to the control positive terminal of normally closed photoelectric switch U3. The control negative terminal of normally closed photoelectric switch U3 is connected to the collector of transistor Q1. One load terminal of normally open photoelectric switch U4 and normally closed photoelectric switch U3 is connected to the non-idle signal output terminal PD and the idle signal output terminal PE, respectively. The other load terminal of normally open photoelectric switch U4 and normally closed photoelectric switch U3 is connected to the common terminal PF. The common terminal PF is grounded through capacitor C5. The emitter of transistor Q1 is grounded.
[0027] The ground terminal GND of Hall sensor U2 is grounded, and its output terminal is connected to the output terminal of LDO chip U6 via pull-up resistor R8.
[0028] In this system, Hall sensors U1 and U2 output the same pedal position signal. When the external control module detects that the voltage of the pedal position signal reaches a threshold (e.g., 0.746-0.97V), since the output of LDO chip U6 is Active Low, it needs to be pulled up by resistor R8 to output. At this time, the output of U2 acts as a power supply, and the base of Q1 needs to be pulled up by R8 to the output of U2 to provide an enable signal. With the output signal of U2's output terminal, Q1 will turn on and off, thus providing a current path for photoelectric switches U4 and U3. The LEDs in U4 and U3 emit light due to the current path. The receiving terminals of the other half of U4 and U3 activate due to the light source signal, thus turning the signal on or off. That is, with the conduction of Q1, the normally open photoelectric switch U4 closes, and the signal output to the non-idle signal output terminal PD changes from low level to high level. The normally closed photoelectric switch U3 opens, and the signal output to the idle signal output terminal PE changes from high level to low level. See [link to relevant documentation]. Figure 4 .
[0029] Resistor R12 is a current-limiting resistor, which limits the current. D7 is a Zener diode. When the voltage across the VCC terminal of U6 is lower than the reverse breakdown voltage of D7 (e.g., 5.1V), D7 does not operate. When it is higher than the reverse breakdown voltage, D7 will clamp the voltage at the VCC terminal of U6 at the reverse breakdown voltage, thereby preventing the VCC terminal of U6 from being damaged by high voltage.
[0030] Resistors R3 and R13 are connected in parallel to protect the photoelectric switch from damage due to overcurrent. Two resistors are used to increase power.
[0031] Capacitor C4 and resistor R11 act as RC low-pass filters at the VDD terminal of U2 to eliminate interference.
[0032] Capacitor C1 is used to provide high-frequency filtering for the output of U2 and eliminate interference.
[0033] Diode D8 is used to filter out transient interference at the output of U2.
[0034] To prevent EMC interference, an EMC protection circuit is installed between the load terminals of normally open photoelectric switch U4 and normally closed photoelectric switch U3. This circuit consists of diodes D4 and D5, resistors T1 and R14, diodes D1, D2, and D3, transistors Q5 and Q6, and resistors R4, R5, and R6. (See [link to relevant documentation]). Figure 1 .
[0035] The idle speed signal output terminal PE is connected to the output terminal of Hall sensor U2 via fuse F1. This is used to program Hall sensor U2 in the initial stage. To avoid this path affecting the output of non-idle speed signals, fuse F1 is blown to disconnect this path after programming is completed.
[0036] As can be seen from the above, the pedal sensor circuit provided in this application embodiment can not only provide pedal position signals to external control modules, but also output idle speed signals and non-idle speed signals, thus meeting the new application scenarios of vehicle intelligence. See also... Figure 1 .
[0037] However, those skilled in the art should recognize that the above embodiments are only used to illustrate the present utility model and are not intended to limit the present utility model. Any changes or modifications to the above embodiments within the scope of the essential spirit of the present utility model will fall within the scope of the claims of the present utility model.
Claims
1. A pedal sensor circuit, characterized in that, The system includes a Hall sensor U1, an LDO chip U6, a normally open photoelectric switch U4, a normally closed photoelectric switch U3, a transistor Q1, and a Hall sensor U2. The power supply terminal of the Hall sensor U1 is connected to the power supply terminal, and its output terminal is connected to an external control module. The power supply terminal of the LDO chip U6 is connected to the power supply terminal, and its output terminal is connected to the base of the transistor Q1. The positive control terminal of the normally open photoelectric switch U4 is connected to the power supply terminal, and its negative control terminal is connected to the positive control terminal of the normally closed photoelectric switch U3. The negative control terminal of the normally closed photoelectric switch U3 is connected to the collector of the transistor Q1. One load terminal of each of the normally open and normally closed photoelectric switches U4 and U3 is connected to the non-idle signal output terminal and the idle signal output terminal, respectively. The other load terminal of each of the normally open and normally closed photoelectric switches U4 and U3 is grounded. The emitter of the transistor Q1 is grounded. The power supply terminal of the Hall sensor U2 is connected to the power supply terminal, and its output terminal is connected to the output terminal of the LDO chip U6 via a resistor R8.
2. The pedal sensor circuit according to claim 1, characterized in that, It also includes an LDO chip U5, an NMOS transistor Q4, a PMOS transistor Q3, a Schottky diode D9, and a transistor Q2. The power supply terminal of the LDO chip U5 is connected to the power supply terminal, and the output terminal is connected to the gate of the NMOS transistor Q4. The source of the NMOS transistor Q4 is grounded, and the drain is connected to the gate of the PMOS transistor Q3. The source of the PMOS transistor Q3 is connected to the power supply terminal, and the drain is divided into three paths: one path is connected to the power supply terminal of the Hall sensor U1, another path is connected to the power supply terminal of the LDO chip U6, and the third path is connected to the power supply terminal of the Hall sensor U2. The cathode of the Schottky diode D9 is connected to the power supply terminal, and the anode is connected to the base of the transistor Q2. The emitter of the transistor Q2 is grounded, and the collector is connected to the gate of the NMOS transistor Q4.
3. The pedal sensor circuit according to claim 2, characterized in that, It also includes a filter capacitor C6, one end of which is connected between the power supply terminal and the source of the PMOS transistor Q3, and the other end is grounded.
4. A pedal sensor circuit according to claim 3, characterized in that, It also includes a Zener diode D10, the negative terminal of which is connected between the source of the PMOS transistor Q3 and the power supply terminal of the LDO chip U5, and the positive terminal is grounded.
5. A pedal sensor circuit according to claim 1, characterized in that, The idle speed signal output terminal is connected to the output terminal of the Hall sensor U2 via fuse F1.