Start control system of engineering machinery
By constructing a main start-up circuit and an emergency start-up circuit, and combining components such as an emergency stop switch and a password unlock controller, the problems of lack of access control, insufficient emergency start-up, and signal crosstalk in the start-up control system of construction machinery have been solved, thus achieving safe and reliable start-up control.
Patent Information
- Application Number
- CN202511885895.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-12-15
- Publication Date
- 2026-03-03
AI Technical Summary
Existing construction machinery start-up control systems lack access control mechanisms, making them vulnerable to unauthorized personnel starting the equipment at will, posing risks of equipment theft and safety hazards. Emergency start functions are not effectively isolated, which can easily lead to accidental starts. Emergency stop functions are also insufficient, making it difficult to quickly cut off the start-up process.
The system constructs a main start-up circuit and an emergency start-up circuit. Through the linkage of components such as an emergency stop switch, a password unlock controller, a start-up interlock relay, and diodes, it enables authorized personnel to start the circuit with password verification. Emergency start-up can only be operated by authorized personnel with a matching key, and it can be quickly started in the event of a critical component failure or password loss, ensuring physical isolation between the two circuits and overall security control.
It effectively eliminates the risks of unauthorized startup and misoperation, ensures the availability and security of the equipment in emergency scenarios, improves the security protection level of startup control, and ensures ease of operation and reliability.
Smart Images
Figure CN121596780A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a starting control system for construction machinery, belonging to the technical field of starting control systems for construction machinery. Background Technology
[0002] As core equipment in construction projects, the safety and reliability of the starting control system of construction machinery directly affect operational efficiency and personnel safety. Currently, the starting methods for construction machinery on the market are mainly divided into two categories: key start and ordinary one-button start. The former triggers the starting circuit through a mechanical key, while the latter drives the starter motor through a single button signal. Neither has an effective access control mechanism. This makes the equipment vulnerable to unauthorized personnel starting it at will, posing risks of theft and misuse, and potentially causing mechanical failures or safety accidents due to improper operation by non-professionals, resulting in economic losses for construction companies.
[0003] Meanwhile, existing start-up control systems lack a robust emergency start-up mechanism. Some start-up systems equipped with password verification functions cannot bypass the authorization verification process to start equipment when the password unlock controller (such as an LCD screen) malfunctions or the password is lost, forcing the interruption of engineering operations. A few devices with emergency start functions lack effective isolation between their emergency circuit and main start circuit, making them prone to signal crosstalk and false starts. Furthermore, the lack of physical access control for the emergency start function also poses a security risk of abuse. In addition, the emergency stop functions of existing systems mostly only apply to the running state after startup, making it difficult to quickly cut off the startup process in case of sudden failures during startup, further reducing the equipment's safety protection level. Summary of the Invention
[0004] Purpose of the invention: To address the shortcomings of existing technologies, this invention provides a starting control system for engineering machinery to solve the problems mentioned in the background section.
[0005] Technical solution: A starting control system for engineering machinery, including a start switch, an electric lock switch, and a start relay, characterized in that it further includes an emergency stop switch, a password unlock controller, an engine ECM, a start interlock relay, a first diode, and a second diode, and the connection relationship of each component is as follows: The signal input terminal of the emergency stop switch is connected in parallel with the ON position output terminal of the start switch and the ON position output terminal of the electric lock switch; The signal output terminal of the emergency stop switch is connected to the electric lock signal input terminal of the engine ECM; The START position output terminal of the start switch is connected to one end of the contact of the start interlock relay via a wire. The password control output terminal of the password unlocking controller is connected to one end of the coil of the start-up interlock relay via a wire. The other end of the coil of the starting interlock relay is connected to the vehicle power ground, and the contact output terminal is connected to the signal input terminal of the second diode through a wire; The START position output terminal of the electric lock switch is connected to the signal input terminal of the first diode via a wire; The signal output terminals of the first diode and the second diode are both connected to the start request signal input terminal of the engine ECM; The start control signal output terminal of the engine ECM is connected to the coil input terminal of the start relay via a wire; The start control signal input terminal of the engine ECM is connected to the coil output terminal of the start relay via a wire; The input terminal of the starter relay is connected to the vehicle power supply, and the output terminal is connected to the signal input terminal of the starter motor.
[0006] This invention constructs a main starting circuit and an emergency starting circuit by setting up an emergency stop switch, a password unlock controller, an engine ECM starting interlock relay, and a first and second diode. In the main starting circuit, the start switch is connected to the engine ECM via the second diode of the starting interlock relay, and the starting interlock relay is linked to the password unlock controller. In the emergency starting circuit, the electric lock switch is connected to the engine ECM via the first diode. The emergency stop switch is connected in series in the power-on circuit, and its signal input terminal is connected in parallel with the ON position output terminal of the start switch and the ON position output terminal of the electric lock switch. The starting relay connects the engine ECM and the starter motor. This allows authorized personnel to start the equipment with password verification, while also enabling start-up via the emergency circuit in case of critical component failure or password loss. This eliminates the security risks of unauthorized start-up and ensures the availability of the equipment in emergency scenarios, making it convenient, safe, and reliable to operate.
[0007] The ON position output terminal of the start switch is connected to the signal input terminal of the emergency stop switch via a wire, and the START position output terminal of the start switch is connected to the contacts of the start interlock relay via a wire.
[0008] By clearly defining the connection between the ON position output of the start switch and the emergency stop switch signal input, and the START position output and the start interlock relay, the power-on signal transmission and start trigger signal transmission paths of the start switch in the main start mode are clearly defined. This ensures precise connection between the one-button start operation and the activation trigger logic of the start interlock relay, thereby improving the signal transmission stability in the main start mode.
[0009] The password control output terminal of the password unlocking controller is connected to the coil of the start-up interlocking relay via a wire, and together with the other end of the coil of the start-up interlocking relay (7), they form a power supply circuit. The controller outputs a conduction signal to close the coil circuit only when the correct power-on password is entered.
[0010] By clearly connecting the password control output terminal of the password unlock controller to the coil of the start-up interlock relay to form a power supply circuit, it is ensured that the password unlock controller can only output a conduction signal when the correct power-on password is entered, so that the coil circuit of the start-up interlock relay is closed. This strengthens the access control barrier of the main start mode and prevents unauthorized personnel from starting the equipment through the main start circuit.
[0011] The signal input terminal of the first diode is connected to the START position output terminal of the ignition switch via a wire, and the signal output terminal is connected to the start request signal input terminal of the engine ECM via a wire; the signal input terminal of the second diode is connected to the contact output terminal of the start interlock relay via a wire, and the signal output terminal is connected to the start request signal input terminal of the engine ECM via a wire.
[0012] By clearly connecting the signal input terminal of the first diode to the START position output terminal of the ignition switch and the signal output terminal to the engine ECM start request signal input terminal, and connecting the signal input terminal of the second diode to the start interlock relay contact output terminal and the signal output terminal to the engine ECM start request signal input terminal, the unidirectional conduction characteristic of the diode is used to achieve physical isolation between the main start circuit and the emergency start circuit, effectively avoiding signal crosstalk between the two circuits and preventing the risk of false start.
[0013] The ON position output terminal of the electric lock switch is connected to the positive terminal of the vehicle power supply via a wire to obtain power, and is also connected to the signal input terminal of the emergency stop switch via a wire. The START position output terminal of the electric lock switch is connected to the signal input terminal of the first diode via a wire.
[0014] By clearly defining that the ON position output of the electric lock switch is connected to the vehicle power supply and the emergency stop switch signal input, and the START position output is connected to the first diode signal input, it is ensured that the electric lock switch can independently provide power-on and start signals, forming an emergency start signal circuit completely independent of the start switch. This ensures that the equipment can be quickly started in case of LCD screen failure or password loss, meeting emergency operation needs.
[0015] The emergency stop switch is connected in series in the power-on circuit between the parallel node of the ON position output terminal of the start switch and the ON position output terminal of the ignition switch and the ignition lock signal input terminal of the engine ECM. The signal input terminal of the emergency stop switch is connected in parallel with the ON position output terminals of the start switch and the ON position output terminal of the ignition lock switch via wires, and the signal output terminal is connected to the ignition lock signal input terminal of the engine ECM via wires.
[0016] By clearly defining the emergency stop switch in series in the power-on circuit between the start switch, ignition switch, and engine ECM, and by connecting its signal input terminal in parallel with the start switch ON position output terminal and the ignition switch ON position output terminal, and its signal output terminal in connection with the engine ECM ignition signal input terminal, global safety control over the main start mode and emergency start mode is achieved. This ensures that in any start-up scenario, the power-on circuit can be quickly cut off by disconnecting the emergency stop switch, terminating the start-up process and preventing the escalation of accidents in case of emergency failure.
[0017] The input terminal of the start-up interlock relay is connected to the output terminal of the start switch (SATRT position) via a wire, and one end of the coil is connected to the password control output terminal of the password unlock controller via a wire; the other output terminal of the start-up interlock relay is connected to the signal input terminal of the second diode via a wire.
[0018] By clearly connecting the contact input terminal of the start interlock relay to the output terminal of the start switch SATRT position, one end of the coil to the password control output terminal of the password unlock controller, and the contact output terminal to the signal input terminal of the second diode, a dedicated signal transmission path for the main start mode is constructed. This ensures that the start interlock relay only responds to the authorization verification signal and operation signal of the main start circuit, without interfering with the normal operation of the emergency start circuit, and guarantees that the functions of the dual start circuits do not conflict with each other.
[0019] The ON position output terminal of the electric lock switch is connected in parallel with the signal input terminals of the vehicle power supply and the emergency stop switch via a wire, and the START position output terminal of the electric lock switch is connected with the signal input terminal of the first diode via a wire.
[0020] By clearly defining the connection between the ON position output of the electric lock switch and the emergency stop switch signal input of the vehicle power supply, and the START position output and the first diode signal input, the independent connection relationship of the emergency start circuit is further solidified. Combined with the physical key characteristics of the electric lock switch, it is ensured that emergency start can only be operated by authorized personnel with matching keys, which not only ensures the convenience of emergency start, but also prevents the emergency circuit from being abused by unauthorized personnel.
[0021] Beneficial Effects: This solution constructs a main start-up circuit through the linkage of a password unlock controller and a start-up interlock relay, enabling authorized personnel to start the device with password verification, effectively eliminating the risks of unauthorized start-up and misoperation. An independent emergency start-up circuit is constructed through an electric lock switch and a first diode, allowing for rapid device startup in case of password unlock controller failure or password loss, ensuring operational continuity. The unidirectional conduction characteristics of the first and second diodes achieve physical isolation between the two circuits, preventing misstarts caused by signal crosstalk. An emergency stop switch connected in series in the power-on circuit enables global control of the full start-up mode, allowing for immediate interruption of the start-up process and enhancing safety. Furthermore, the physical key design of the electric lock switch further restricts emergency start access. The overall system structure is simple, the connection logic is clear, and the operation is convenient, balancing the safety, reliability, and emergency backup requirements of start-up control. It effectively solves the shortcomings of existing technologies, such as lack of access control, insufficient emergency start-up capabilities, signal crosstalk, and incomplete emergency shutdown. Attached Figure Description
[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.
[0023] Figure 1 This is a schematic diagram of the control system circuit of the present invention.
[0024] Figure 2 This is a control logic block diagram of the control system of the present invention. Detailed Implementation
[0025] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0026] In the description of this invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.
[0027] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0028] like Figure 1 and 2 As shown, a starting control system for construction machinery includes a start switch 1, an electric lock switch 2, a start relay 3, an emergency stop switch 4, a password unlock controller 5, an engine ECM 6, a start interlock relay 7, a first diode 8, and a second diode 9. The signal input terminal of the emergency stop switch 4 is connected in parallel with the ON position output terminal of the start switch 1 and the ON position output terminal of the electric lock switch 2; The signal output terminal of the emergency stop switch 4 is connected to the electric lock signal input terminal of the engine ECM6; The START position output terminal of the start switch 1 is connected to the contact input of the start interlock relay 7 via a wire; The password control output terminal of the password unlocking controller 5 is connected to one end of the coil of the start interlock relay 7 via a wire. The other end of the coil of the starting interlock relay 7 is connected to the vehicle power ground, and the contact output terminal is connected to the signal input terminal of the second diode 9 through a wire; The START position output terminal of the electric lock switch 2 is connected to the signal input terminal of the first diode 8 via a wire; The signal output terminals of the first diode 8 and the second diode 9 are both connected to the start request signal input terminal of the engine ECM6; The start control signal output terminal of the engine ECM6 is connected to the coil input terminal of the start relay 3 via a wire; The start control signal input terminal of the engine ECM is connected to the coil output terminal of the start relay via a wire; The input terminal of the starter relay 3 is connected to the vehicle power supply, and the output terminal is connected to the signal input terminal of the starter motor.
[0029] This invention constructs a main starting circuit and an emergency starting circuit by setting up an emergency stop switch 4, a password unlock controller 5, an engine ECM 6, a starting interlock relay 7, a first diode 8, and a second diode 9. In the main starting circuit, the start switch 1 is connected to the engine ECM 6 via the starting interlock relay 7 and the second diode 9, and the starting interlock relay 7 is linked with the password unlock controller 5. In the emergency starting circuit, the electric lock switch 2 is connected to the engine ECM 6 via the first diode 8. The emergency stop switch 4 is connected in series in the power-on circuit, and its signal input terminal is connected in parallel with the ON position output terminal of the start switch 1 and the ON position output terminal of the electric lock switch 2. The starting relay 3 connects the engine ECM 6 and the starter motor. This allows authorized personnel to start the equipment with password verification, while also enabling start-up via the emergency circuit in case of critical component failure or password loss. This eliminates the security risks of unauthorized start-up and ensures the availability of the equipment in emergency scenarios. The operation is convenient and safe.
[0030] The ON position output terminal of the start switch 1 is connected to the signal input terminal of the emergency stop switch 4 via a wire, and the START position output terminal of the start switch 1 is connected to the input contact of the start interlock relay 7 via a wire.
[0031] By clearly connecting the ON position output terminal of start switch 1 to the signal input terminal of emergency stop switch 4, and the START position output terminal to start interlock relay 7, the power-on signal transmission and start trigger signal transmission paths of start switch 1 in the main start mode are clearly defined, ensuring precise connection between the one-button start operation and the activation trigger logic of start interlock relay 7, thereby improving the signal transmission stability of the main start mode.
[0032] The password control output terminal of the password unlock controller 5 is connected to the coil of the start-up interlock relay 7 via a wire, and together with the other end of the coil of the start-up interlock relay (7), they form a power supply circuit. The circuit is closed only when the correct power-on password is entered.
[0033] By clearly connecting the password control output terminal of the password unlock controller 5 to the coil of the start interlock relay 7 to form a power supply circuit, it is ensured that the password unlock controller 5 can only output a conduction signal when the correct power-on password is entered, so that the coil circuit of the start interlock relay 7 is closed. This strengthens the access control barrier of the main start mode and prevents unauthorized personnel from starting the equipment through the main start circuit.
[0034] The signal input terminal of the first diode 8 is connected to the START position output terminal of the electric lock switch 2 via a wire, and the signal output terminal is connected to the start request signal input terminal of the engine ECM6 via a wire; the signal input terminal of the second diode 9 is connected to the contact output terminal of the start interlock relay 7 via a wire, and the signal output terminal is connected to the start request signal input terminal of the engine ECM6 via a wire.
[0035] By clearly connecting the signal input terminal of the first diode 8 to the START position output terminal of the ignition switch 2 and the signal output terminal to the engine ECM6 start request signal input terminal, and connecting the signal input terminal of the second diode 9 to the contact output terminal of the start interlock relay 7 and the signal output terminal to the engine ECM6 start request signal input terminal, the unidirectional conduction characteristic of the diodes is used to achieve physical isolation between the main start circuit and the emergency start circuit, effectively avoiding signal crosstalk between the two circuits and preventing the risk of false start.
[0036] The ON position output terminal of the electric lock switch 2 is connected to the positive terminal of the vehicle power supply via a wire to obtain power, and is also connected to the signal input terminal of the emergency stop switch 4 via a wire. The START position output terminal of the electric lock switch 2 is connected to the signal input terminal of the first diode 8 via a wire.
[0037] By clearly defining that the ON position output terminal of the electric lock switch 2 is connected to the vehicle power supply and the signal input terminal of the emergency stop switch 4, and the START position output terminal is connected to the signal input terminal of the first diode 8, it is ensured that the electric lock switch 2 can independently provide power-on and start signals, forming an emergency start signal circuit completely independent of the start switch 1. This ensures that the equipment can be quickly started when the LCD screen fails or the password is lost, meeting the needs of emergency operations.
[0038] The emergency stop switch 4 is connected in series in the power-on circuit between the parallel node of the ON position output terminal of the start switch 1 and the ON position output terminal of the ignition switch 2 and the ignition signal input terminal of the engine ECM6. The signal input terminal of the emergency stop switch 4 is connected in parallel with the ON position output terminals of the start switch 1 and the ON position output terminals of the ignition switch 2 via wires, and the signal output terminal is connected to the ignition signal input terminal of the engine ECM6 via wires.
[0039] By clearly defining that the emergency stop switch 4 is connected in series in the power-on circuit between the start switch 1, the ignition switch 2, and the engine ECM6, and that its signal input terminal is connected in parallel with the ON position output terminal of the start switch 1 and the ON position output terminal of the ignition switch 2, and its signal output terminal is connected to the ignition signal input terminal of the engine ECM6, global safety control over the main start mode and emergency start mode is achieved. This ensures that in any start-up scenario, the power-on circuit can be quickly cut off by disconnecting the emergency stop switch 4, terminating the start-up process and preventing the escalation of accidents in case of emergency failure.
[0040] The input contact of the start-up interlock relay 7 is connected to the START position output terminal of the start switch 1 via a wire, and the coil input terminal is connected to the password control output terminal of the password unlock controller 5 via a wire; the contact output terminal of the start-up interlock relay 7 is connected to the signal input terminal of the second diode 9 via a wire.
[0041] By clearly connecting the contact input terminal of the start interlock relay 7 to the output terminal of the start switch 1 in the SATRT position, connecting one end of the coil of the start interlock relay 7 to the password control output terminal of the password unlock controller 5, and connecting the contact output terminal to the signal input terminal of the second diode 9, a dedicated signal transmission path for the main start mode is constructed. This ensures that the start interlock relay 7 only responds to the authorization verification signal and operation signal of the main start circuit, without interfering with the normal operation of the emergency start circuit, and ensuring that the functions of the dual start circuits do not conflict with each other.
[0042] The ON position output terminal of the electric lock switch 2 is connected in parallel with the signal input terminal of the vehicle power supply and the emergency stop switch 4 via a wire, and the START position output terminal of the electric lock switch 2 is connected with the signal input terminal of the first diode 8 via a wire.
[0043] By clearly defining the connection between the ON position output of the electric lock switch 2 and the signal input of the vehicle power emergency stop switch 4, and the START position output and the signal input of the first diode 8, the independent connection relationship of the emergency start circuit is further solidified. Combined with the physical key characteristics of the electric lock switch 2, it is ensured that emergency start can only be operated by authorized personnel with matching keys, which not only ensures the convenience of emergency start but also prevents the emergency circuit from being abused by unauthorized personnel.
[0044] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.
[0045] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims
1. A starting control system for engineering machinery, comprising a start switch (1), an electric lock switch (2), and a start relay (3), characterized in that, It also includes an emergency stop switch (4), a password unlock controller (5), an engine ECM (6), a start interlock relay (7), a first diode (8), and a second diode (9); The signal input terminal of the emergency stop switch (4) is connected in parallel with the ON position output terminal of the start switch (1) and the ON position output terminal of the electric lock switch (2); The signal output terminal of the emergency stop switch (4) is connected to the electric lock signal input terminal of the engine ECM (6); The START position output terminal of the start switch (1) is connected to the contact input terminal of the start interlock relay (7) via a wire; The password control output terminal of the password unlocking controller (5) is connected to one end of the coil of the start-up interlock relay (7) via a wire; The other end of the coil of the starting interlock relay (7) is connected to the vehicle power ground, and the contact output end is connected to the signal input end of the second diode (9) through a wire; The START position output terminal of the electric lock switch (2) is connected to the signal input terminal of the first diode (8) via a wire; The signal output terminals of the first diode (8) and the second diode (9) are both connected to the start request signal input terminal of the engine ECM (6); The start control signal output terminal of the engine ECM (6) is connected to the coil input terminal of the start relay (3) via a wire; One end of the starting relay (3) is connected to the starting control relay of the ECM (6), and the other end of the coil is connected to the starting control relay circuit of the ECM (6) through a wire; The input terminal of the starter relay (3) is connected to the vehicle power supply, and the output terminal is connected to the signal input terminal of the starter motor.
2. The starting control system for construction machinery according to claim 1, characterized in that: The ON position output terminal of the start switch (1) is connected to the signal input terminal of the emergency stop switch (4) via a wire, and the START position output terminal of the start switch (1) is connected to the contact of the start interlock relay (7) via a wire.
3. The starting control system for construction machinery according to claim 1, characterized in that: The password control output terminal of the password unlock controller (5) is connected to the coil of the start-up interlock relay (7) through a wire, and together with the other end of the coil of the start-up interlock relay (7), they form a power supply circuit. The circuit is closed only when the correct power-on password is entered.
4. The starting control system for construction machinery according to claim 1, characterized in that: The signal input terminal of the first diode (8) is connected to the START position output terminal of the electric lock switch (2) via a wire, and the signal output terminal is connected to the start request signal input terminal of the engine ECM (6) via a wire; the signal input terminal of the second diode (9) is connected to the contact output terminal of the start interlock relay (7) via a wire, and the signal output terminal is connected to the start request signal input terminal of the engine ECM (6) via a wire.
5. The starting control system for construction machinery according to claim 1, characterized in that: The ON position output terminal of the electric lock switch (2) is connected to the positive terminal of the vehicle power supply through a wire to obtain power, and is also connected to the signal input terminal of the emergency stop switch (4) through a wire. The START position output terminal of the electric lock switch (2) is connected to the signal input terminal of the first diode (8) through a wire.
6. The starting control system for construction machinery according to claim 1, characterized in that: The emergency stop switch (4) is connected in series in the power-on circuit between the parallel node of the ON position output terminal of the start switch (1) and the ON position output terminal of the electric lock switch (2) and the electric lock signal input terminal of the engine ECM (6). The signal input terminal of the emergency stop switch (4) is connected in parallel with the ON position output terminal of the start switch (1) and the ON position output terminal of the electric lock switch (2) through a wire, and the signal output terminal is connected to the electric lock signal input terminal of the engine ECM (6) through a wire.
7. The starting control system for construction machinery according to claim 1, characterized in that: One end of the coil of the start-up interlock relay (7) is grounded through a wire, and the other end is connected to the password control output terminal of the password unlock controller (5) through a wire; the contact output terminal of the start-up interlock relay (7) is connected to the signal input terminal of the second diode (9) through a wire.
8. The starting control system for construction machinery according to claim 1, characterized in that: The ON position output terminal of the electric lock switch (2) is connected in parallel with the signal input terminal of the vehicle power supply and the emergency stop switch (4) via a wire, and the START position output terminal of the electric lock switch (2) is connected to the signal input terminal of the first diode (8) via a wire.