A startup control method for a large-tonnage hybrid loader

Abstract

The present invention discloses a start-up control method for a large-tonnage hybrid loader, including an engine, a vehicle controller, a start-up electronic control system and a drive control system; the vehicle controller is used to control the start-up electronic control system to be turned on / off, and receives an engine speed signal to determine whether the start-up condition of the drive control system is met; the start-up electronic control system is used to start the engine to reach a predetermined speed; after the engine reaches the predetermined speed, the drive control system is started to start the large-tonnage hybrid loader. The present invention can use a power battery as a power source to drive a starter motor, thereby driving the start of the engine, avoiding the problem that the low-voltage lead-acid battery of the vehicle cannot drive the starter motor when the battery is low, making the whole machine unable to start.

Description

Technical Field

[0001] The present invention relates to a control system and a control method, and in particular to a startup control method for a large-tonnage hybrid loader, and belongs to the technical field of engineering machinery. Background Art

[0002] At present, if the traditional fuel loader solution is used on large-tonnage and super-large-tonnage loaders, the engine power selection must be large to meet the working conditions, which will increase the cost of the whole machine as the engine cost increases. If a pure electric solution is used, a battery with a large power capacity will be required, which will also make the cost too high. Therefore, in the design of large-tonnage loaders, electric transmission technology can effectively avoid the above problems. Due to the normal engine start-up, the starter motor is powered by the low-voltage electricity of the whole vehicle, and the starter motor drives the engine to reach the set speed. Since there are multiple controllers in the electric transmission solution, the low-voltage battery will consume too much power when the key is powered on. This may cause the low-voltage power supply to the starter motor to be too low during startup, and the engine cannot be started. Summary of the invention

[0003] The present invention aims at the starting system in the current large-tonnage electric drive loader and provides a solution of using a high-voltage battery to power the starting motor and driving the engine through the starting motor, which effectively solves the problem that the engine cannot be started by the starting motor when the power of the low-voltage battery of the whole vehicle is low.

[0004] In order to achieve the above-mentioned object, the technical solution adopted by the present invention is a start control method for a large-tonnage hybrid loader, including an engine, a vehicle controller, a start electronic control system and a drive control system;

[0005] The vehicle controller is used to control the start-up of the electronic control system and receive the engine speed signal to determine whether the start-up conditions of the drive control system are met;

[0006] The starting electronic control system is used to start the engine to reach a predetermined speed; after the engine reaches the predetermined speed, the drive control system is started to start the large-tonnage hybrid loader.

[0007] As a preferred solution of the startup control method of a large-tonnage hybrid loader described in the present invention: the startup electronic control system includes a startup motor, a startup motor controller, a relay and a power battery;

[0008] The power battery is electrically connected to the starter motor controller through a relay; the starter motor controller is electrically connected to the starter motor; the power battery provides energy for the starter motor;

[0009] The relay comprises a starting electronic control pre-charging relay and a starting electronic control main circuit relay which are electrically connected to the vehicle controller respectively.

[0010] As a preferred embodiment of the starting control method of a large-tonnage hybrid loader described in the present invention: the vehicle controller pre-charges the starting motor controller through the starting electronic control pre-charging relay, at which time the starting electronic control main circuit relay is in a closed state, and after the pre-charging is completed, the starting electronic control pre-charging relay is closed, and at the same time, the starting electronic control main circuit relay is closed to put the starting motor into a working state.

[0011] As a preferred solution of the startup control method of a large-tonnage hybrid loader described in the present invention: the drive control system includes a supercapacitor, a generator controller, a generator, a wheel-side electronic control and a wheel-side motor;

[0012] The generator is electrically connected to the super capacitor through a generator controller; the super capacitor is electrically connected to the wheel side motor through a wheel side electronic control;

[0013] A supercapacitor main circuit relay is installed between the generator controller and the supercapacitor;

[0014] A supercapacitor pre-charging relay is installed between the wheel side electronic control and the supercapacitor;

[0015] The supercapacitor pre-charging relay and the supercapacitor main circuit relay are respectively connected to the vehicle controller.

[0016] As a preferred solution of the startup control method of a large-tonnage hybrid loader described in the present invention: the vehicle controller is used to determine whether the supercapacitor reaches a preset threshold;

[0017] When the supercapacitor is lower than the preset threshold, the supercapacitor cannot be charged for the wheel-side electronic control. At this time, the vehicle controller closes the supercapacitor main circuit relay to enable the generator to charge the supercapacitor.

[0018] When the supercapacitor is higher than the preset threshold, the supercapacitor does not need to be charged by the generator. At this time, the vehicle controller closes the supercapacitor pre-charging relay to pre-charge the wheel-side electronic control and generator controller, meeting the conditions for starting the wheel-side electronic control and generator controller.

[0019] As a preferred solution of the startup control method of a large-tonnage hybrid loader described in the present invention: the engine, the starter motor and the generator are coaxially mechanically connected.

[0020] As a preferred solution of the startup control method of a large-tonnage hybrid loader described in the present invention: the startup electronic control system and the drive control system are respectively provided with insulation testers for performing insulation detection on the systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 This is a control flow chart of the present invention.

[0023] The beneficial technical effect of the present invention is that the present invention can use the power battery as a power source to drive the starter motor, thereby driving the start of the engine, avoiding the problem that the low-voltage lead-acid battery of the whole vehicle cannot drive the starter motor when the power is low, making the whole machine unable to start. DETAILED DESCRIPTION

[0024] The present invention will be further described below in conjunction with the accompanying drawings.

[0025] like Figure 1 As shown, a starting control method for a large-tonnage hybrid loader includes an engine, a vehicle controller, a starting electronic control system and a drive control system;

[0026] The vehicle controller is used to control the start-up of the electronic control system and receive the engine speed signal to determine whether the start-up conditions of the drive control system are met;

[0027] The starting electronic control system is used to start the engine to reach a predetermined speed; after the engine reaches the predetermined speed, the drive control system is started to start the large-tonnage hybrid loader.

[0028] The starting electronic control system includes a starting motor, a starting motor controller, a relay and a power battery;

[0029] The power battery is electrically connected to the starter motor controller through a relay; the starter motor controller is electrically connected to the starter motor; the power battery provides energy for the starter motor;

[0030] The relay comprises a starting electronic control pre-charging relay and a starting electronic control main circuit relay which are electrically connected to the vehicle controller respectively.

[0031] The vehicle controller pre-charges the starter motor controller through the starting electronic control pre-charging relay. At this time, the starting electronic control main circuit relay is in a closed state. After the pre-charging is completed, the starting electronic control pre-charging relay is closed, and the starting electronic control main circuit relay is closed at the same time, so that the starter motor is in a working state.

[0032] The drive control system includes a supercapacitor, a generator controller, a generator, a wheel-side electronic control and a wheel-side motor;

[0033] The generator is electrically connected to the super capacitor through a generator controller; the super capacitor is electrically connected to the wheel side motor through a wheel side electronic control;

[0034] A supercapacitor main circuit relay is installed between the generator controller and the supercapacitor;

[0035] A supercapacitor pre-charging relay is installed between the wheel side electronic control and the supercapacitor;

[0036] The supercapacitor pre-charging relay and the supercapacitor main circuit relay are respectively connected to the vehicle controller.

[0037] The vehicle controller is used to determine whether the supercapacitor has reached a preset threshold;

[0038] When the supercapacitor is lower than the preset threshold, the supercapacitor cannot be charged for the wheel-side electronic control. At this time, the vehicle controller closes the supercapacitor main circuit relay to enable the generator to charge the supercapacitor.

[0039] When the supercapacitor is higher than the preset threshold, the supercapacitor does not need to be charged by the generator. At this time, the vehicle controller closes the supercapacitor pre-charging relay to pre-charge the wheel-side electronic control and generator controller, meeting the conditions for starting the wheel-side electronic control and generator controller.

[0040] The engine, the starter motor and the generator are coaxially mechanically connected.

[0041] The starting electric control system and the driving control system are respectively provided with insulation testers for performing insulation test on the systems.

[0042] Specifically, Figure 2 As shown, at startup, the vehicle controller detection system has no abnormalities. After receiving the start signal, it first starts the electronic control pre-charging relay to pre-charge the starter motor controller through the power battery. When the pre-charging is completed, the starter electronic control main circuit relay will be closed. At this time, the starter motor and the electronic control obtain high voltage electricity and are in a working state. The vehicle controller will request the motor to output torque. Since the starter motor and the engine are coaxially connected, the starter motor will drag the engine to rotate after it rotates. When the engine speed reaches a certain value, the engine starts to spray fuel to start. When the engine starts, the starter motor can stop outputting. This method does not pass through the engine's starter motor, which can avoid completing the start when the low-voltage power supply system is low in power.

[0043] At the same time, in the above process, for the power-on process in the drive circuit, the vehicle controller must first determine the current voltage value of the supercapacitor. If the voltage is lower than the set threshold, the supercapacitor cannot pre-charge the drive circuit at this time. The vehicle controller directly controls the supercapacitor main circuit relay, and can use the generator's back electromotive force to drive the generator controller to work, realize current output, and charge the supercapacitor in the drive circuit. In this process, since the generator controller, supercapacitor and four drive electronic controls are connected to the same circuit, the drive electronic control will also be pre-charged when the supercapacitor is charged.

[0044] If the voltage of the supercapacitor exceeds the set threshold, the supercapacitor pre-charging relay can be closed first. Since the internal voltage of the supercapacitor exceeds the threshold, the wheel-side electronic control and the generator controller are pre-charged, and the conditions for starting the wheel-side electronic control and the generator controller are met. Therefore, in this case, there is no need to use the generator to charge the supercapacitor during startup. The wheel-side electronic control and the generator controller are pre-charged through the supercapacitor, and the vehicle starts after waiting for the engine to work normally.

[0045] The above description is only an embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above by the embodiment, it is not intended to limit the present invention. Any technician familiar with the profession can make some changes or modifications to equivalent embodiments of equivalent changes using the technical contents disclosed above without departing from the scope of the technical solution of the present invention. However, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A startup control method for a large-tonnage hybrid loader, characterized in that: Including engine, vehicle controller, starting electronic control system and drive control system; The vehicle controller is used to control the start-up of the electronic control system and receive the engine speed signal to determine whether the start-up conditions of the drive control system are met; The starting electronic control system is used to start the engine to reach a predetermined speed; after the engine reaches the predetermined speed, the drive control system is started to start the large-tonnage hybrid loader; The starting electronic control system includes a starting motor, a starting motor controller, a relay and a power battery; The power battery is electrically connected to the starter motor controller through a relay; the starter motor controller is electrically connected to the starter motor; the power battery provides energy for the starter motor; The relay comprises a starter electronic control pre-charge relay and a starter electronic control main circuit relay which are electrically connected to the vehicle controller respectively; The drive control system includes a supercapacitor, a generator controller, a generator, a wheel-side electronic control and a wheel-side motor; The generator is electrically connected to the super capacitor through a generator controller; the super capacitor is electrically connected to the wheel side motor through a wheel side electronic control; A supercapacitor main circuit relay is installed between the generator controller and the supercapacitor; A supercapacitor pre-charging relay is installed between the wheel side electronic control and the supercapacitor; The supercapacitor pre-charging relay and the supercapacitor main circuit relay are respectively connected to the vehicle controller.

2. The startup control method of a large-tonnage hybrid loader according to claim 1, characterized in that: The vehicle controller pre-charges the starter motor controller through the starting electronic control pre-charging relay. At this time, the starting electronic control main circuit relay is in a closed state. After the pre-charging is completed, the starting electronic control pre-charging relay is closed, and the starting electronic control main circuit relay is closed at the same time, so that the starter motor is in a working state.

3. The startup control method of a large-tonnage hybrid loader according to claim 1, characterized in that: The vehicle controller is used to determine whether the supercapacitor has reached a preset threshold; When the supercapacitor is lower than the preset threshold, the supercapacitor cannot be charged for the wheel-side electronic control. At this time, the vehicle controller closes the supercapacitor main circuit relay to enable the generator to charge the supercapacitor. When the supercapacitor is higher than the preset threshold, the supercapacitor does not need to be charged by the generator. At this time, the vehicle controller closes the supercapacitor pre-charging relay to pre-charge the wheel-side electronic control and generator controller, meeting the conditions for starting the wheel-side electronic control and generator controller.

4. The startup control method of a large-tonnage hybrid loader according to claim 1, characterized in that: The engine, the starter motor and the generator are coaxially mechanically connected.

5. The startup control method of a large-tonnage hybrid loader according to claim 1, characterized in that: The starting electric control system and the driving control system are respectively provided with insulation testers for performing insulation test on the systems.

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