Switch control device for ignition system of construction machinery and ignition system

Abstract

The utility model relates to a switch control device for an ignition system of engineering machinery and the ignition system comprising the switch control device. The ignition system comprises an ignition switch and a power switch, and the device comprises a pressure detection mechanism used for detecting the pressure value of at least one seat of the engineering machinery; the idle speed detection mechanism is used for detecting whether an engine of the engineering machinery is in an idle speed working condition or not; the first timer is configured to start timing based on detection results of the pressure detection mechanism and the idle speed detection mechanism; the first control loop is configured to turn off the ignition switch when the timing time of the first timer reaches a first duration; and the second control loop is configured to turn off the power switch when the timing time of the first timer reaches a second duration. The ignition control device can effectively prevent the problem of power shortage caused by continuous discharge of the storage battery in an unmanned use state, and avoids the trouble that the machine cannot be started for the second time due to the power shortage of the storage battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to the switch control field of engineering machinery, more specifically, the utility model relates to a kind of switch control device for the ignition system of engineering machinery, and the ignition system for engineering machinery comprising the device. BACKGROUND

[0002] Engineering machinery, especially large engineering machinery (such as excavators, loaders, bulldozers, etc.) plays an indispensable role in various engineering operations. Most of the engineering machinery on the market currently supports the engine to be turned off at idle state, but they generally lack the ability to automatically cut off the main power supply after the engine is turned off. This can cause the battery to run out of power, thereby affecting the machine's ability to start again.

[0003] Normally in the engine stop state, some electrical equipment of the engineering machinery can only rely on the battery power to maintain operation. For example, after the engine is stopped, the operator may still use the radio, CD player or other electrical equipment in the cab, and often leave the cab for a long time and forget to turn off these devices, causing the battery to continue to discharge, eventually causing the battery to run out of power, so that the machine cannot start again. This not only causes the engineering machinery to fail to start normally, affecting the overall work efficiency of the engineering machinery, but also can shorten the service life of the battery, increase the maintenance cost of the equipment, and even can cause safety hazards. SUMMARY

[0004] The utility model aims at providing a kind of switch control device for the ignition system of engineering machinery, mainly for automatically controlling the on-off of the ignition system of engine and whole machine power when engineering machinery stops working, to avoid the problem of battery running out of power due to long time discharging. The core idea of the switch control device is to automatically determine whether the engineering machinery is in the state of no one using by intelligently detecting whether there is a driver on the seat and whether the engine is in idle state, and automatically cut off the ignition system and power supply system when necessary.

[0005] The first aspect of the utility model provides a kind of switch control device for the ignition system of engineering machinery, the ignition system includes the ignition switch for starting the engine of engineering machinery and the power supply switch for connecting the power supply source of the ignition system, wherein the switch control device includes:

[0006] A pressure detection mechanism is used to detect the pressure value on at least one seat of the engineering machinery.

[0007] An idle speed detection mechanism is used to receive an idle speed indication signal from an external controller and detect whether the engine of the engineering machinery is in idle speed working condition based on the idle speed indication signal.

[0008] a first timer connected to the pressure detection mechanism and the idle speed detection mechanism and configured to start timing based on detection results of the pressure detection mechanism and the idle speed detection mechanism;

[0009] a first control loop provided between the first timer and the ignition switch and configured to turn off the ignition switch when a timing time of the first timer reaches a pre-set first time length; and

[0010] a second control loop provided between the first timer and the power switch and configured to turn off the power switch when the timing time of the first timer reaches a pre-set second time length, wherein the second time length is greater than the first time length.

[0011] According to an optional embodiment, the first control loop comprises a first optocoupler and a first power tube, wherein an input side of the first optocoupler is connected to the first timer, an output side of the first optocoupler is connected to a control end of the first power tube, and an output end of the first power tube is connected to the ignition switch.

[0012] According to an optional embodiment, the switch control device further comprises:

[0013] a second timer connected to the pressure detection mechanism and the idle speed detection mechanism and configured to start timing based on detection results of the pressure detection mechanism and the idle speed detection mechanism, wherein the second control loop is further connected to the second timer and configured to turn off the power switch when a timing time of the second timer reaches a pre-set third time length.

[0014] According to an optional embodiment, the second control loop comprises a second optocoupler and a second power tube, wherein an input side of the second optocoupler is connected to the first timer and the second timer, an output side of the second optocoupler is connected to a control end of the second power tube, and an output end of the second power tube is connected to the power switch.

[0015] According to an optional embodiment, the first timer is configured to start timing when the idle speed detection mechanism detects that the engine is in an idle speed working condition and the pressure detection mechanism detects that the voltage value is zero.

[0016] According to an optional embodiment, the second timer is configured to start timing when the idle speed detection mechanism detects that the engine is not in an idle speed working condition and the pressure detection mechanism detects that the voltage value is zero.

[0017] According to an optional embodiment, the idle indication signal comprises a real-time rotation speed of the engine, an engine torque.

[0018] According to an optional embodiment, the external controller is an engine controller or a vehicle controller of the construction machine.

[0019] The second aspect of the utility model provides a kind of ignition system for construction machine, the ignition system includes ignition switch for starting the engine of construction machine and power switch for connecting the power supply source of the ignition system, wherein, the ignition system further includes the switch control device according to as described above.

[0020] The switch control device of the utility model realizes the automatic control of ignition switch and power switch by intelligently detecting seat pressure and engine idle state, and combines timer logic.The device can effectively prevent the problem of battery depletion due to continuous discharge in unattended state, avoid the trouble that machine cannot be started again due to battery depletion, prolong the service life of battery, improve the overall work efficiency and reliability of construction machine.The switch control device is simple in structure, adopts modular design, easy to integrate into existing construction machine power system, and can be widely applied to power management system of various construction machines. BRIEF DESCRIPTION OF DRAWINGS

[0021] The specific embodiments incorporated herein by reference and the subsequent detailed description of the drawings Figure One With the specific embodiments for explaining some principles of the utility model, other features and advantages of the method of the utility model will become clear or more specifically explained.

[0022] Figure 1 The overall frame diagram of the switch control device of the ignition system for construction machine according to an exemplary embodiment of the utility model is shown.

[0023] Figure 2 The internal structure diagram of the switch control device of the ignition system for construction machine according to an exemplary embodiment of the utility model is shown.

[0024] Figure 3 The operation flow chart of the switch control device of the ignition system for construction machine according to an exemplary embodiment of the utility model is shown. DETAILED DESCRIPTION

[0025] A switch control device for an ignition system of a construction machine according to the present application will be described below with reference to the accompanying drawings and by way of examples. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the present application can be practiced without some or all of these specific details. In other instances, well known features have not been described in detail so as not to unnecessarily obscure the present application. Thus, the following aspects, features, embodiments and advantages are merely illustrative and are not considered elements or limitations of the claims.

[0026] At present, the electrical system of most construction machines can automatically shut down the engine under engine idle state, but generally cannot automatically cut off the whole machine power supply after the engine is turned off, so it still needs to rely on the storage battery to continuously supply power to part of the vehicle electrical equipment, which may cause the storage battery to be discharged. In addition, the electrical system in the existing construction machine lacks intelligent detection and control of the vehicle state, for example, it cannot automatically determine whether the vehicle is in an unattended use state, so it cannot automatically disconnect the whole machine power supply.

[0027] The present application aims to solve the problem of storage battery discharge caused by the whole machine power supply system still being connected after the engine of the construction machine is turned off. To this end, the present application provides a switch control device for an ignition system of a construction machine, the core idea of which is to automatically disconnect the negative pole connection of the storage battery and cut off the whole machine power supply when the whole machine is stopped and the vehicle is in an unattended use state, so as to prevent the storage battery from continuous discharge and avoid the storage battery from being discharged. The switch control device of the present application can effectively avoid the problem that the whole machine cannot be started due to the storage battery being discharged, thereby improving the use efficiency and reliability of the construction machine.

[0028] Figure 1 A whole frame diagram of a switch control device for an ignition system of a construction machine according to an exemplary embodiment of the present application is shown. The device includes a pressure detection mechanism, an idle speed detection mechanism, a first timer and a second timer, and a first control loop and a second control loop, etc. After the construction machine is powered on, the switch control device starts to work. First, the idle speed detection mechanism and the pressure detection mechanism can monitor the engine operating parameters and the seat pressure signal in the cab, respectively, for example. Here, the engine operating parameters may, for example, be an engine speed or torque indication signal received from the engine controller or the vehicle controller of the construction machine, based on which it can be determined whether the engine is in idle operating condition.

[0029] When no pressure signal is detected, i.e. no driver is sitting on the seat, if the idle detection mechanism detects an idle condition, a timer 1 is started, otherwise a timer 2 is started. If the timer 1 continuously receives the same frequency of the rotation speed signal and the pressure signal for more than a preset time length (e.g. greater than or equal to 10 minutes), the ignition switch is first automatically closed to the off position, and continues to count to another preset time length (e.g. 3 minutes), and the power switch is closed, so as to cut off the power supply of the machine.

[0030] In addition, if the timer 2 continuously counts to a preset time length (e.g. 3 minutes), the power switch is also directly closed, so as to ensure that the machine does not waste fuel in the absence of people, and also avoids the secondary failure of the machine due to the battery power loss.

[0031] In summary, the switch control device confirms whether there is an operator on the seat by monitoring the seat pressure, and confirms whether the machine is in an idle running condition by monitoring the engine speed. Here, the idle detection mechanism can not only confirm the engine idle condition based on the speed, but also consider the engine torque, speed, ignition switch and other parameters received from the engine ECM or vehicle controller to comprehensively confirm the idle condition.

[0032] Overall, the switch control device can make a whole judgment on the current state of the engineering machine by monitoring the seat pressure and the idle signal, and make a corresponding switch-off operation accordingly. It is assumed that there are the following three situations after the engine of the engineering machine is turned off:

[0033] Case 1: There is no pressure output from the seat in the cab of the engineering machine, and the engine is in an idle condition, the first timer starts to work, and according to the preset time length, the ignition switch and the power switch are closed in turn;

[0034] Case 2: There is no pressure output from the seat, and the engine is not in an idle condition, the second timer starts to work, and according to the preset time length, the power switch is directly closed.

[0035] Case 3: There is pressure output from the seat, and regardless of whether the engine is in an idle condition or not, the first and second timers do not work.

[0036] Figure 2 An internal structure diagram of a switch control device for an ignition system of an engineering machine according to an exemplary embodiment of the present application is shown. The ignition system includes an ignition switch S1 and a power switch S2, wherein the ignition switch S1 is a control switch of an engine ignition circuit, and is used to start the engine of the engineering machine. The power switch S2 is a control switch of the power supply of the engineering machine, and is used to connect the power supply of the ignition system of the engineering machine. The power switch S2 can be provided, for example, at the negative side of the power supply.

[0037] As Figure 2 shown in Fig. 1, the switch control device 1 mainly comprises a pressure detection mechanism 10, an idle detection mechanism 20, two timers T1 and T2, and two control loops P1 and P2. The internal structure of these components and the connection between them will be described in detail below. Figure 2

[0038] Firstly, the pressure detection mechanism 10 is used to detect the pressure value on the driver seat of the construction machine to determine whether there is a driver on the seat. The pressure detection mechanism is usually composed of a pressure sensor installed below the seat. When there is pressure on the seat, i.e. someone is sitting on it, the pressure sensor outputs a corresponding voltage signal; when there is no pressure on the seat, i.e. no one is sitting on it, the pressure sensor outputs a voltage of zero.

[0039] The idle detection mechanism 20 is used to detect whether the engine of the construction machine is in an idle state. The idle detection mechanism determines the engine state by receiving an idle indication signal from the engine controller or the vehicle controller of the construction machine. The idle indication signal usually includes parameters such as the real-time speed and torque of the engine. The idle detection mechanism comprehensively determines whether the engine is in an idle state according to these parameters.

[0040] For example, the idle detection mechanism 20 can receive the current speed of the engine from the engine controller or the vehicle controller, and after converting and processing the speed information internally, it provides a corresponding voltage value at the input end of the comparator. The comparator can compare the voltage value received at the input end with the voltage value at the reference end, and based on the comparison result, output a corresponding high or low level to the first and second timers. For example, if the current speed of the engine is less than the set value, the comparator outputs a high level to indicate that the engine is in an idle state, otherwise the comparator can output a low level to indicate that the engine is not in an idle state.

[0041] It is worth noting that the form of the idle indication signal can be diversified. For example, in addition to evaluating the idle state of the engine based on its operating parameters, the idle detection mechanism 20 can also directly receive an indication signal from the R port of the generator of the construction machine. For example, when the R port continuously outputs a square wave signal, it represents that the engine is working normally; when there is no output signal at the R port, it represents that the engine is in an idle state.

[0042] ​The first timer T1 is connected to the pressure detecting mechanism 10 and the idle detecting mechanism 20, and starts timing based on the detection results of the two mechanisms. When the pressure detecting mechanism 10 detects no pressure on the seat and the idle detecting mechanism 20 detects that the engine is in the idle state, the first timer T1 starts timing. When the timing time of the first timer T1 reaches a first time length, for example, 10 minutes, the ignition switch S1 is turned off, and the first timer T1 continues timing. When the continued timing reaches a predetermined time length, for example, 3 minutes, the cumulative timing time reaches a second time length, for example, 13 minutes, and the power switch S2 is turned off.

[0043] The second timer T2 is also connected to the pressure detecting mechanism and the idle detecting mechanism, and starts timing based on the detection results of the two mechanisms. The function of the second timer T2 is similar to that of the first timer T1, but is used for different control logic. When the pressure detecting mechanism 10 detects no pressure on the seat and the idle detecting mechanism 20 detects that the engine is not in the idle state, the second timer T2 starts timing. When the timing time of the second timer T2 reaches a third time length, for example, 3 minutes, the power switch S2 is turned off.

[0044] The output control circuit can be connected in series in the existing whole-machine ignition switch and power supply master switch circuit, and can sequentially control the ignition switch and the power supply master switch to be turned off after the whole-machine state is determined according to the seat pressure and the idle state mentioned above, thereby solving the problem that the whole-machine power supply is consumed and the machine cannot be started.

[0045] Here, the output control circuit can include a first control circuit P1 and a second control circuit P2. The first control circuit P1 is arranged between the first timer T1 and the ignition switch S1, and is used to control the on-off of the ignition switch S1. The second control circuit P2 is arranged between the first timer T1 and the second timer T2 and the power switch S2, and is used to control the on-off of the power switch S2.

[0046] Specifically, the first control circuit includes a first optocoupler and a first power tube. The input side of the first optocoupler is connected to the first timer T1, the output side is connected to the control end of the first power tube, and the output end of the first power tube is connected to the ignition switch S1. When the timing of the first timer T1 reaches the first time length, the first optocoupler is turned on, the first power tube is controlled to turn off the ignition switch, and the ignition circuit of the engine is cut off.

[0047] The second control circuit includes a second optocoupler and a second power tube. The input side of the second optocoupler is connected to the first timer T1 and the second timer T2, the output side is connected to the control end of the second power tube, and the output end of the second power tube is connected to the power switch. When the timing of the first timer T1 reaches the second time length or the timing of the second timer T2 reaches the third time length, the second optocoupler is turned on, the second power tube is controlled to turn off the power switch S2, and the whole-machine power supply is cut off.

[0048] In Figure 2 the example, the first and second power tubes are implemented as insulated gate bipolar transistors (abbreviated as "IGBT"), the gates G of the two IGBTs are respectively connected to the corresponding photoelectric couplers, the collectors C are connected to the direct current source Vs, and the emitters E are connected to the corresponding controlled switches, i.e. the ignition switch S1 or the power supply switch S2. However, it is also conceivable that the first and second power tubes are implemented using other power devices, for example MOS tubes.

[0049] In addition, it needs to be further explained that, for the purpose of brevity and clarity, Figure 2 the circuit diagrams in Figure 2 only show part of the electrical elements of each module. It should be understood by those skilled in the art that each module can contain other additional or alternative elements to achieve its module function in addition to the elements shown in

[0050] For example, it can be understood that, in the pressure detection mechanism 10, in addition to the resistance elements shown in Figure 2 , a pressure sensor that can convert seat pressure into an electrical signal should also be included. The pressure sensor can detect changes in pressure on the seat and convert this physical change into a measurable electrical signal to be passed to the subsequent resistance voltage dividing circuit. Similarly, in the idle speed detection mechanism 20, in addition to the shown resistors and comparators, other signal conversion and filtering functional elements can be included. These elements may, for example, include amplifiers, filters, analog-to-digital converters, etc., which are responsible for processing the idle speed indication signal received from the engine controller or the vehicle controller and providing it to the comparator after processing and conversion.

[0051] In addition, in the embodiment of Figure 3 , the two control loops P1 and P2 are driven in the manner of photoelectric coupler and IGBT module, but in fact other isolation driving modes can also be used, for example, pulse transformer isolation driving. These alternatives can also provide electrical isolation and control functions to ensure the safety and reliability of the control loop.

[0052] Figure 3 An operation flowchart of a switch control device of an ignition system for a working machine according to an example embodiment of the present application is shown.

[0053] In the initial state, it is assumed that the ignition switch and the power switch of the construction machine are both closed. First, the pressure detection mechanism is used to detect whether the seat in the cab has pressure output. For example, a precision resistor can be used to form a seat pressure detection circuit to determine whether there is a person on the seat, i.e., if there is no pressure signal output on the seat, there is no person, and if there is a pressure signal output on the seat, there is a person. Subsequently, the state of the machine can be determined in combination with the engine idle condition.

[0054] Specifically, if there is no pressure output on the seat, the switch control device can continue to use the idle detection mechanism to confirm whether the engine is in an idle state. Specifically, a comparator circuit can be used to detect the speed of the speed pulse signal from the external port, and the real-time speed of the engine of the machine can be detected, so that it can be determined whether the machine is in an idle state.

[0055] In this regard, the state of the machine can be in the following three cases:

[0056] 1. The engine is in an idle state and there is no pressure output on the seat

[0057] When the pressure detection mechanism detects that there is no pressure on the seat (representing no person riding) and the idle detection mechanism detects that the engine is in an idle state, the first timer starts timing.

[0058] When the first timer times up to 10 minutes, the first control circuit closes the ignition switch, and the engine is turned off. Subsequently, the first timer continues to time up to 13 minutes, and the second control circuit closes the power switch to cut off the power supply of the machine.

[0059] 2. The engine is not in an idle state and there is no pressure output on the seat

[0060] When the pressure detection mechanism detects that there is no pressure on the seat and the idle detection mechanism detects that the engine is not in an idle state, the second timer starts timing.

[0061] When the second timer times up to 3 minutes, the second control circuit closes the power switch to cut off the power supply of the machine.

[0062] 3. There is pressure output on the seat

[0063] Regardless of whether the engine is in an idle state, as long as the pressure detection mechanism detects that there is pressure output on the seat (representing a person riding), the first timer and the second timer do not work, and the ignition switch and the power switch continue to be in the on state to ensure normal operation of the construction machine.

[0064] The utility model provides a kind of switch control device for the ignition system of engineering machinery, and the device is realized the automatic control to ignition switch and power switch by intelligent detection seat pressure and engine idling state, and combines timer logic.This device can effectively prevent the problem of battery depletion caused by continuous discharge in unattended state, avoid the trouble that secondary start machine cannot be started due to battery depletion, prolong the service life of battery, improve the overall work efficiency and reliability of engineering machinery.The switch control device is simple in structure, adopts modular design, easy to integrate into existing engineering machinery power system, and can be widely applied to power management system of various engineering machinery.

[0065] In the utility model, the term "connection" refers to "electrical connection" or "communication connection". In addition, terms such as "contain" and "include" mean that the technical solutions of the present application do not exclude the presence of other units that are not directly or explicitly stated in addition to the units directly and explicitly stated in the specification and claims.

[0066] In the utility model, those skilled in the art can understand that the disclosed system can be implemented in other ways. The system implementation described above is only illustrative, for example, the division of the modules is only a logical function division, and actual implementation can have another division method, for example, the functions of multiple modules can be combined or the function of a module can be further split. The modules in each embodiment of the utility model can be integrated in a processing unit, or each module can exist physically, or two or more modules can be integrated in one unit.

[0067] Although the utility model has disclosed as above with preferred embodiment, the utility model is not limited to this. Various changes and modifications made without departing from the spirit and scope of the utility model should be included in the protection scope of the utility model, therefore the protection scope of the utility model should be limited by the range defined in claim.

Claims

1. A switching control device for an ignition system of a construction machine, the ignition system including an ignition switch (SI) for starting an engine of the construction machine and a power supply switch (S2) for turning on a power supply source of the ignition system, characterized by, The switch control device comprises: a pressure detection mechanism (10) for detecting a pressure value on at least one seat of the engineering machinery; an idle detection mechanism (20) for receiving an idle indication signal from an external controller and detecting whether the engine of the engineering machinery is in an idle working condition based on the idle indication signal; a first timer (T1) connected to the pressure detection mechanism (10) and the idle detection mechanism (20) and configured to start timing based on the detection results of the pressure detection mechanism (10) and the idle detection mechanism (20); a first control loop (P1) arranged between the first timer and the ignition switch and configured to turn off the ignition switch when the timing time of the first timer reaches a pre-set first time length; and a second control loop (P2) arranged between the first timer and the power switch and configured to turn off the power switch when the timing time of the first timer reaches a pre-set second time length, wherein the second time length is greater than the first time length.

2. A switching control device for an ignition system of a working machine according to claim 1, characterized in that, The first control loop (P1) comprises a first optocoupler and a first power tube, wherein the input side of the first optocoupler is connected to the first timer (T1), the output side of the first optocoupler is connected to the control end of the first power tube, and the output end of the first power tube is connected to the ignition switch (S1).

3. A switching control device for an ignition system of a working machine according to claim 2, characterized in that, The switch control device further comprises: a second timer (T2) connected to the pressure detection mechanism (10) and the idle detection mechanism (20) and configured to start timing based on the detection results of the pressure detection mechanism (10) and the idle detection mechanism (20), wherein the second control loop is further connected to the second timer and configured to turn off the power switch when the timing time of the second timer reaches a pre-set third time length.

4. Switch control device for an ignition system of a working machine according to claim 3, characterized in that The second control loop (P2) comprises a second optocoupler and a second power tube, wherein the input side of the second optocoupler is connected to the first timer (T1) and the second timer (T2), the output side of the second optocoupler is connected to the control end of the second power tube, and the output end of the second power tube is connected to the power switch (S2).

5. Switch control device of an ignition system of a working machine according to any one of claims 1 to 4, characterized in that, The first timer is configured to start timing when the idle detection mechanism detects that the engine is in the idle working condition and the pressure detection mechanism detects that the voltage value is zero.

6. A switch control device for an ignition system of a working machine according to claim 3 or 4, characterized in that, The second timer is configured to start timing when the idle detection mechanism detects that the engine is not in the idle working condition and the pressure detection mechanism detects that the voltage value is zero.

7. Switch control device of an ignition system of a working machine according to any one of claims 1 to 4, characterized in that, The idle indication signal comprises the real-time speed of the engine, the torque of the engine.

8. Switch control device of an ignition system of a working machine according to any one of claims 1 to 4, characterized in that, The external controller is an engine controller or a vehicle controller of the engineering machinery.

9. An ignition system for a working machine, said ignition system comprising an ignition switch for starting an engine of the working machine and a power supply switch for switching on a power supply source of the ignition system, characterized in that The ignition system further comprises the switch control device according to any one of claims 1 to 8.

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