Eddy current retarder system with stepless adjustable field current and control method thereof
A technology of eddy current retarder and excitation current, applied in electric braking system, control system, control electromechanical brake, etc., can solve the problems of increasing unsafe factors, aggravating retarder damage, and low efficiency of retarder, etc. Achieve the effect of avoiding mechanical structure changes, avoiding large power loss, and improving safety and reliability.
Inactive Publication Date: 2015-11-11
JIANGSU UNIV
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Problems solved by technology
When the mechanical structure changes seriously due to temperature rise, the retarder will be stuck
[0004] When the vehicle is running at low speed, the coil of the retarder is in the state of repeated charging, resulting in large power loss and low efficiency of the retarder, which aggravates the damage of the retarder and increases the unsafe factors of the vehicle.
Method used
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[0029] The present invention will be further described below with reference to specific embodiments in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited thereto.
[0030] Such as figure 1 with figure 2 Shown, the principle of PWM in this embodiment. U in the picture d is the average voltage across the device, and E is the back electromotive force across the inductive element. The supply voltage is provided by the car battery. The function of the capacitor C is filtering, and the diode VD provides a freewheeling circuit for the excitation circuit of the retarder to release the stored energy of the inductance when the power transistor VT is turned off. The base of the power transistor is driven by a pulse voltage with an adjustable frequency and pulse width. In one switching cycle, when 0≤t≤Ton, U b is positive, VT is saturated and turned on, and the power supply voltage is added to both ends of the retarder excit...
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The invention relates to the eddy current retarder field and specifically relates to an eddy current retarder system with a stepless adjustable field current and a control method thereof. The system comprises an information acquisition unit, an information processing unit, an A / D conversion module, a PWM waveform generation module, a power tube, a temperature sensor and an eddy current retarder. The information acquisition unit is connected with the A / D conversion module through a CAN bus. The A / D conversion module is connected with the information processing unit through a CAN bus. The information processing unit and the PWM waveform generation module are connected through a CAN bus. The PWM waveform generation module is connected with a driving and protecting circuit through a CAN bus. The driving and protecting circuit is connected with the power tube. Stepless adjustment of an eddy current retarder current is achieved through PWM pulse width debugging. To put it in other words, retarding torque is adjusted in a stepless way. In a constant speed condition, a vehicle is braked through the eddy current retarder. Heat fading risks caused by excessively high friction brake temperature due to continuous braking through a friction brake when the vehicle is moving down a long slope are thus prevented.
Description
technical field [0001] The invention relates to the field of eddy current retarders, in particular to an eddy current retarder system with steplessly adjustable excitation current. Background technique [0002] When the vehicle goes down a long slope at a constant speed, frequent use of the friction brakes will cause the temperature of the friction brakes to be too high, which may cause a "thermal recession" phenomenon, resulting in a sharp drop in braking force, which is an extremely dangerous working condition. For existing vehicles, auxiliary braking is generally performed through an eddy current retarder. The existing eddy current retarders mostly use four high-current relays for hierarchical control, and the change of braking torque is discontinuous in grades, which cannot realize some advanced control functions such as constant current, constant torque, and constant speed. [0003] The eddy current retarder achieves speed retardation by heat and energy consumption. Th...
Claims
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Login to View More IPC IPC(8): H02P15/00B60L7/28
CPCY02T10/64
Inventor 申小敏张龙飞
Owner JIANGSU UNIV