CN202147714U

CN202147714U - Electric power steering (EPS) system controller with temperature protection function

Info

Publication number: CN202147714U
Application number: CN201120240218U
Authority: CN
Inventors: 陈少棠
Original assignee: XIAMEN JIAYUDE AUTOMOBILE ELECTRONIC TECHNOLOGY CO LTD
Current assignee: XIAMEN JIAYUDE AUTOMOBILE ELECTRONIC TECHNOLOGY CO LTD
Priority date: 2011-07-08
Filing date: 2011-07-08
Publication date: 2012-02-22
Anticipated expiration: 2021-07-08

Abstract

The utility model discloses an electric power steering (EPS) system controller with temperature protection function, comprising a power driving module with a high-power circuit, a signal acquisition module, a power supply module, a temperature protection hardware circuit and a current control chip. A temperature detection element in the temperature protection hardware circuit is arranged near the high-power circuit; the current control chip is connected with both the temperature protection hardware circuit and the high-power circuit; the temperature detection element is used to acquire the temperature signals near the high-power circuit, the temperature protection hardware circuit is used to transform the temperature signals into voltage signals and input the voltage signals into the current control chip, and the current control chip is used to logically process the voltage signals and adjust the high-power circuit current inputted into an EPS motor according to the logical processing result of the voltage signals. Due to the adoption of the technical scheme, the destructive influence of the EPS system in the limit working state for a long time to the EPS system controller and the EPS motor can be improved radically, the working life of the EPS system controller and the EPS motor can be prolonged, and the reliability of the whole EPS system can be improved.

Description

Electric booster steering system controller with temperature protection function

Technical field

The utility model relates to a kind of electric boosting steering system, particularly a kind of electric booster steering system controller with temperature protection function.

Background technology

Electric boosting steering system (Electric Power Steering System is called for short EPS) generally comprises sensors such as mechanical steering system, moment of torsion and the speed of a motor vehicle, controller, power steering motor and its speed reduction gearing etc.Wherein torque sensor is installed on the steering shaft of mechanical steering system to detect driver's operation moment and output torque signal; The power steering motor can be installed in mechanical steering axle or the deflector, to chaufeur assist torque is provided through speed reduction gearing; Controller calculates the driving current value that need provide for the power steering motor through detected GES, torque signal.

When EPS is in the maximal work state for a long time; Its controller will provide big electric current for a long time; Cause controller and power steering motor temperature sharply to rise; If the state of temperature rise is not judged and is carried out corresponding protection and handle, with the work life that reduces controller and power steering motor, and then the reliability of reduction EPS.On the other hand, usually, the EPS controller generally comprises power driver module (basic power-assisted module), current of electric control module, signal acquisition module and power module.Wherein, the high-power circuit in the controller power driver module is main pyrotoxin, and near the temperature this high-power circuit is near the highest temperature of PCB circuit card.

Therefore, to controller particularly near the temperature rising state its high-power circuit judge and carry out corresponding protection and handle, be design EPS controller subject matter to be solved.

To this, in the prior art, generally all be to take directly high-power circuit to be carried out physics heat-dissipation mode (as cooling base or thermal column etc. are installed) to protect.Have following defective thus: one, to controller particularly the temperature rising state in its high-power circuit zone know nothing, can not intuitive and accurate judgement target area temperature be height or low just also; Two, owing to do not grasp the temperature rising state in high-power circuit zone, also just not understanding existing heat radiation protection has and does not reach radiating effect, and maximal work state too high to temperature, that heat radiation protection has played not thermolysis is at a complete loss as to what to do; Three, this protection processing only is to carry out the heat-dissipation designing treatment around surface phenomena (heat that high-power circuit produces); And do not carry out designing treatment to profound reason (heat is the electric current generation by high-power circuit); Belong to afterwards and remedy; There is hysteresis quality, and cures the symptoms, not the disease, be unfavorable for better protection controller and power steering motor; Four, it only is that this main pyrotoxin of high-power circuit that is directed against controller dispels the heat that this protection is handled, and to the temperature rise influence that the electric current of high-power circuit causes for other zones of controller and power steering motor etc., does not have substantive the improvement.

In view of this, the inventor carries out in-depth study to the above-mentioned defective in existing EPS controller field, and this case produces thus.

The utility model content

The purpose of the utility model is to provide a kind of electric booster steering system controller with temperature protection function; To improve EPS damaging influence to controller and power steering motor when being in the maximal work state for a long time; Prolong the work life of controller and power steering motor, improve the reliability of total system.

To achieve these goals, the technical scheme of the utility model is following:

Electric booster steering system controller with temperature protection function; Comprise power driver module, signal acquisition module and the power module of being with high-power circuit; Also comprise temperature protection hardware circuit and current control chip; Detector unit in the temperature protection hardware circuit be positioned at high-power circuit near, the current control chip links to each other with high-power circuit with the temperature protection hardware circuit respectively.Said detector unit is gathered near the temperature the high-power circuit; And convert temperature signal to voltage signal received current control chip by the temperature protection hardware circuit; The current control chip carries out logical process with voltage signal, and adjusts the electric current of high-power circuit input redirect assist motor according to the logical process result.

As preferably, detector unit and high-power circuit are at a distance of 0.8mm ± 0.2mm.

After adopting such scheme; The EPS controller is through the detector unit in the temperature protection hardware circuit that carries; Can recognize the temperature and the temperature variations in the main pyrotoxin high-power circuit zone of controller under the mode of operation accurately; The temperature protection hardware circuit changes this temperature signal into voltage signal, and is input to the current control chip.The current control chip carries out logical process to the voltage signal of input, and according to the input redirect assist motor electric current that the logical process result adjusts high-power circuit, suitably reduces to import current of electric up to cutting off the input current of electric.

This programme is from causing controller and power steering motor temperature and raise and then produce profound reason---the electric current of high-power circuit of a large amount of heats; Through accurate grasp near the temperature rising state high-power circuit; Rely on the current control chip to make the control policy of temperature protection; Improved EPS in the damaging influence that is in for a long time under the maximal work state controller and power steering motor from root; Prolong the work life of controller and power steering motor, improved the reliability of total system, and do not influenced the manipulation feel of chaufeur under normal driving states.

In order further to explain the technical scheme of the utility model, the utility model is done further detailed description below in conjunction with Fig. 1, Fig. 2 and embodiment.

Description of drawings

Fig. 1 is the structural representation of the utility model embodiment one.

Fig. 2 is the fundamental diagram of the utility model embodiment one.

Label declaration

High-power circuit 10

Temperature protection hardware circuit 20 detector units 21

Current control chip 30

Power steering motor 4.

The specific embodiment

Like Fig. 1, shown in Figure 2, be a preferred embodiment of the utility model.

As shown in Figure 1, a kind of EPS controller with temperature protection function comprises high-power circuit 10.This high-power circuit 10 links to each other with the exterior power steering motor 4 of controller (shown in Fig. 1 dashed rectangle), and the circuit production of controller is on the PCB circuit card.Foregoing belongs to the existing common technique in EPS field, and this place just repeats no more.

This EPS controller also comprises temperature protection hardware circuit 20 and current control chip 30; Detector unit 21 in the temperature protection hardware circuit 20 be positioned at high-power circuit 10 near, current control chip 30 links to each other with high-power circuit 10 with temperature protection hardware circuit 20 respectively.Detector unit 21 is preferable with high-power circuit 10 at a distance of 0.8mm ± 0.2mm.

When controller is started working; Detector unit 21 is gathered near the temperature the high-power circuit 10; Temperature protection hardware circuit 20 converts the temperature signal that obtains to voltage signal; And received current control chip 30, current control chip 30 carries out logical process with voltage signal, and adjusts the electric current of high-power circuit 10 input redirect assist motors according to the logical process result.

As shown in Figure 2; When controller is under the maximal work state for a long time; Heat radiation protection has played not thermolysis as temperature is too high in appearance near showing as high-power circuit 10; Perhaps temperature build-up is too fast and heat radiation protection has little time to work, perhaps during all ultimate limit state situation of the too high and poor heat radiation etc. of temperature, after detector unit 21 detects this temperature rise situation; Temperature protection hardware circuit 20 will convert the temperature rise signal that obtains into voltage signal; And received current control chip 30, current control chip 30 carries out logical process with voltage signal, and the electric current that suitably reduces high-power circuit 10 input motors according to the logical process result is up to cutting off the input current of electric.

Like this; Improved EPS in the damaging influence that is in for a long time under the maximal work state controller and power steering motor from root; Prolonged the work life of controller and power steering motor; Improve the reliability of total system, and do not influenced the manipulation feel of chaufeur under normal driving states.

The specific embodiment that the above is merely the utility model is not to this case design-calculated restriction, and all equivalent variations of doing according to the design key of this case all fall into the protection domain of this case.

Claims

1. the electric booster steering system controller that has temperature protection function; Comprise power driver module, signal acquisition module and the power module of being with high-power circuit; It is characterized in that: also comprise temperature protection hardware circuit and current control chip; Detector unit in the temperature protection hardware circuit be positioned at high-power circuit near, the current control chip links to each other with high-power circuit with the temperature protection hardware circuit respectively; Said detector unit is gathered near the temperature the high-power circuit; And convert temperature signal to voltage signal received current control chip by the temperature protection hardware circuit; The current control chip carries out logical process with voltage signal, and adjusts the electric current of high-power circuit input redirect assist motor according to the logical process result.

2. the electric booster steering system controller with temperature protection function as claimed in claim 1 is characterized in that: detector unit and high-power circuit are at a distance of 0.8mm ± 0.2mm.