Eddy current retarder controller and control method thereof

Abstract

The invention discloses an eddy current retarder controller and a control method thereof. The eddy current retarder controller comprises a clamping circuit, a power supply chip U1, a digital input sampling circuit U13, an analogue input sampling circuit U14, an indicator lamp, an alarm drive circuit U6, a single chip microcomputer U4 and a CAN bus transceiver chip U11, wherein the clamping circuit is formed by connecting a voltage stabilizing diode Z1, a voltage stabilizing diode Z2 and a voltage stabilizing diode Z3. By adopting the single chip microcomputer as a work core, constant-current and short-circuit protection, temperature protection and gear-switching smooth gradient functions can be completely achieved, temperature protection and constant-current and short-circuit protection values can be calibrated through reprogramming according to the requirements of customers, a hardware circuit does not need to be changed, and the application is more flexible.

Description

technical field [0001] The invention relates to the technical field of auto parts, in particular to an eddy current retarder controller and a control method thereof. Background technique [0002] For cars that often travel in mountainous or hilly areas, in order to continuously reduce or maintain a stable vehicle speed for a long time when going down a long slope and reduce or release the load on the service brake, it is usually necessary to install an auxiliary braking deceleration device such as a retarder. [0003] In recent years, more and more domestic bus manufacturers have adopted the eddy current retarder as a standard or optional product. The eddy current retarder has improved the safety, economy and comfort of the bus. The existing eddy current retarder Most of the retarders are controlled by high-current relays in stages. The relays are generally classified as 2, 3 and 4. The switching between stages is directly switched, and the change of braking torque is discon...

AI Technical Summary

Problems solved by technology

[0003] In recent years, more and more domestic bus manufacturers have adopted the eddy current retarder as a standard or optional product. The eddy current retarder has improved the safety, economy and comfort of the bus. The existing eddy current retarder Most of the retarders are controlled by high-current relays in stages. The relays are generally classified as 2, 3 and 4. The switching between stages is directly switched, and the change of braking torque is discontinuous; the eddy current retarder is generally It is controlled by a mechanical handle switch, and the switching sequence of the handle switch is always fixed, generally from the first gear to the last gear. This control method always allows the front gear to be in the working state first, so that The control relay and the retarder work in a serious unbalanced state, and the service life is greatly shortened

[0004] Another situation is that when the control handle is not fully open, the braking torque of the retarder will be seriously eccentric, which will lead to changes in the mechanical structure and reduce the service life of the retarder. The controller cannot realize some advanced control functions such as constant current, short-circuit protection, temperature protection, etc.; while the PWM retarder controller realizes slow-speed hierarchical control in PWM control mode, and can realize smooth switching when shifting gears, and always ( Except when the load is abnormal) all gears are powered at the same time, so there will be no eccentricity of retarder braking torque, and it can also realize constant current, short circuit protection and temperature protection functions

Images