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CN-121983917-A - Overheat protection function and starter

CN121983917ACN 121983917 ACN121983917 ACN 121983917ACN-121983917-A

Abstract

The invention discloses an overheat protection function, which comprises the following steps of powering on and initializing a protection module, recording initial voltage and starting timing for continuous working time, judging whether the current temperature of a temperature acquisition point is lower than a preset power-on threshold value by a temperature acquisition module, disconnecting a relay if the current temperature of the temperature acquisition point is lower than the preset power-on threshold value, stopping the work of a starter if the current temperature of the temperature acquisition point is lower than the preset power-on threshold value, controlling the relay to be conducted and opening an electromagnetic switch by a protector if the current temperature of the temperature acquisition point is lower than the preset power-on threshold value, continuously monitoring the current temperature of the temperature acquisition point by the temperature acquisition module in the continuous power-on process of the relay, judging whether the continuous working time of the protector reaches or exceeds the preset time-delay protection threshold value or not (2) and controlling the relay to be powered off if any one of the temperature acquisition point and the temperature acquisition point is lower than the preset power-on threshold value (1) to stop the work of the starter. The dual and intelligent monitoring and protection of the temperature and the working time of the starter are realized through the cooperation of the protector and the temperature sensor.

Inventors

  • CHEN XICHUN
  • LIU ZENGLIN
  • LI BIN
  • WANG TING

Assignees

  • 泉州开普勒车用电机有限公司

Dates

Publication Date
20260505
Application Date
20260128

Claims (10)

  1. 1. The overheat protection function is applied to a protector, and the protector comprises a protection module and a temperature acquisition module and is characterized in that the overheat protection function is integrated in the protection module and comprises the following steps of: step 1, powering up and initializing a protection module, recording initial voltage and starting timing for continuous working time; Step 2, the temperature acquisition module judges whether the current temperature of the temperature acquisition point is lower than a preset power-on threshold value; step 3, if the step 2 is judged to be no, the relay is disconnected, and the starter is stopped; And 4, continuously monitoring the current temperature of the temperature acquisition point by the temperature acquisition module in the continuous power-on process of the relay, and executing the following judgment by the protector in parallel: (1) Whether the continuous working time reaches a preset delay protection threshold value or not; (2) Whether the current temperature reaches or exceeds a preset protection threshold; and 5, if any one of the judgment (1) or the judgment (2) in the step 4 is met, the protector controls the relay to be powered off so as to stop the starter.
  2. 2. The overheat protection function according to claim 1, wherein the energization threshold and the protection threshold are set according to a model of the starter, an insulation temperature resistance level, and an installation position of the temperature sensor.
  3. 3. The overheat protection function according to claim 2, wherein: if the installation position of the temperature sensor is a carbon brush holder, the electrifying threshold is 120 ℃ and the protecting threshold is 150 ℃; if the installation position of the temperature sensor is a stator connecting wire, the electrifying threshold is 100 ℃, and the protecting threshold is 130 ℃; If the installation position of the temperature sensor is the stator inlet wire end lug, the electrifying threshold value is 75 ℃, and the protection threshold value is 95 ℃.
  4. 4. The overheat protection function as claimed in claim 1, wherein in step 1, the program is initialized for about 30ms.
  5. 5. The overheat protection function as claimed in claim 1, wherein in step 4, the delay protection threshold is 30s.
  6. 6. The overheat protection function according to claim 1, wherein the protection module is further integrated with at least one of a top tooth protection function, an overrun protection function, and a delay protection function.
  7. 7. A starter is characterized by applying the overheat protection function according to any one of claims 1 to 6, wherein the starter comprises a relay, an electromagnetic switch, a protector and a temperature sensor; the protector is electrically connected with the coils of the temperature sensor and the relay respectively; The temperature sensor is arranged at a preset position of the starter, a temperature signal of a temperature acquisition point is measured by the temperature sensor, the acquired temperature signal is fed back to the protector, and the protector controls the on and off of the relay coil according to a set control logic through the received temperature signal, so that overheat protection is carried out on the starter.
  8. 8. The starter of claim 7, wherein the temperature sensor is any one of PT1000, PT100, ni1000 or PTC thermistor.
  9. 9. The starter of claim 8, wherein the temperature sensor is PT1000.
  10. 10. The starter of claim 9, wherein the temperature sensor is connected to the protector via a temperature sensing wire.

Description

Overheat protection function and starter Technical Field The invention relates to the technical field of a starter, in particular to an overheat protection function and a starter. Background The starter is an electric appliance for short-time working and heavy-current vehicles, can generate a large amount of heat when being electrified for running for a long time or being frequently started for many times, is extremely easy to cause high-temperature ablation of a motor part and generates safety risks. Especially, the temperature of the rear end of the shell near the rear cover is highest, and if the starter in a high-temperature state continuously runs, particularly if a driver is forced to start under the fault condition, the high-temperature ablation of the starter is easily caused. Thus, the number of starters with overheat protection is increasing. The main current scheme is that a temperature control switch is arranged in a main heating component of a starter and is connected in series with a relay control coil loop, and the temperature of a main body of the starter is detected by using the temperature control switch to respond to opening and closing so as to adjust and control the on-off of the relay coil, thereby realizing overheat protection of the starter. The starter with overheat protection at present mostly adopts a mode of a relay (containing a wire harness) +an adapter (containing a constraint fixing component) +a temperature control switch (containing a wire harness) to complete the series connection of the temperature control switch and a relay control loop, the connecting mode has a plurality of parts, and additional fixation and constraint are needed, which can definitely bring higher vibration failure risk and misconnection risk. The normally-closed type kick temperature control switch is a single electronic element and cannot be integrated with other protection functions. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides an overheat protection function and a starter, double and intelligent monitoring and protection of the temperature and the working time of the starter are realized through cooperation of a protector and a temperature sensor, and the problems that the protection mode of the traditional temperature control switch is fixed, is not easy to integrate and is difficult to install to influence the protection level and the like are solved. In order to achieve the purpose, the invention is realized by the following technical scheme that the overheat protection function is applied to a protector, the protector comprises a protection module and a temperature acquisition module, and the overheat protection function is integrated in the protection module and comprises the following steps: step 1, powering up and initializing a protection module, recording initial voltage and starting timing for continuous working time; Step 2, the temperature acquisition module judges whether the current temperature of the temperature acquisition point is lower than a preset power-on threshold value; step 3, if the step 2 is judged to be no, the relay is disconnected, and the starter is stopped; And 4, continuously monitoring the current temperature of the temperature acquisition point by the temperature acquisition module in the continuous power-on process of the relay, and executing the following judgment by the protector in parallel: (1) Whether the continuous working time reaches a preset delay protection threshold value or not; (2) Whether the current temperature reaches or exceeds a preset protection threshold; and 5, if any one of the judgment (1) or the judgment (2) in the step 4 is met, the protector controls the relay to be powered off so as to stop the starter. Further, the power-on threshold and the protection threshold are set according to the type of the starter, the insulation temperature resistance level and the installation position of the temperature sensor. Further, if the installation position of the temperature sensor is a carbon brush holder, the electrifying threshold is 120 ℃ and the protecting threshold is 150 ℃, if the installation position of the temperature sensor is a stator connecting wire, the electrifying threshold is 100 ℃ and the protecting threshold is 130 ℃, and if the installation position of the temperature sensor is a stator wire inlet end lug, the electrifying threshold is 75 ℃, and the protecting threshold is 95 ℃. Further, in step 1, the program is initialized for about 30ms. Further, in step 4, the delay protection threshold is 30s. Furthermore, the protection module is also integrated with at least one of a top tooth protection function, an overrunning protection function and a time delay protection function. On the other hand, the starter is provided with an overheat protection function, the starter comprises a relay, an electromagnetic switch, a protector and a temperature sensor, the protector is respectively