CN102424033A

CN102424033A - Windscreen wiper control system based on singlechip

Info

Publication number: CN102424033A
Application number: CN2011103675113A
Authority: CN
Inventors: 王滔; 明锐
Original assignee: Chongqing Changan Automobile Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2011-11-18
Filing date: 2011-11-18
Publication date: 2012-04-25

Abstract

The invention relates to a windscreen wiper control system based on a singlechip, which comprises a main controller, a windscreen wiper motor, a combined switch, a windscreen wiper position sensor, a rain quantity sensor, a logic control module, a metal-oxide-semiconductor field effect transistor (MOSFET) driving module and an H-axle motor driving circuit, wherein the main controller is respectively and electrically connected with the combined switch, the windscreen wiper position sensor, the rain quantity sensor and the logic control module, the logic control module is electrically connected with the MOSFET driving module, the MOSFET driving module is electrically connected with the H-axle motor driving circuit, and the H-axle motor driving circuit is electrically connected with the windscreen wiper motor. When the system is in an intelligent mode state, a windscreen wiper can select the water wiping speed according to the water quantity on windscreen.

Description

A kind of SCM Based rain blowing controlled system

Technical field

The present invention relates to the rain blowing controlled system of automobile.

Background technology

Existing rain blowing controlled system is made up of combined switch, high slow-speed relay and three carbon brush motors; When running into the rainy day; Chaufeur makes windscreen wiper be operated in fast mode, low-speed mode and intermittent mode according to the subjective judgement of rainfall on the Windshield is come the operative combination switch.The pitch time of windscreen wiper intermittent mode is one group of time of presetting, and chaufeur can intermittently be scraped water in case selected wiper will be carried out according to this time through a pitch time of selecting the knob selection to need.This method has a very big defective, is exactly when rainfall is relatively large, owing to scrape the water spacer overlong time, chaufeur can feel that the visual field is fuzzy; When rainfall relatively hour because it is too short to scrape the water spacer time, Windshield will be scraped very driedly, so can Windshield be scratched for a long time.For fear of the appearance of both of these case, the operative combination switch that chaufeur will be frequent is perhaps selected pitch time, and this is very unfavorable to traffic safety.

And existing windscreen wiper is owing to be by manual activation, so when running into surface gathered water and be splashed on the Windshield, chaufeur can not in time react, remove the water on the Windshield, also can have influence on traffic safety.

The rain shaving electrical machine of existing wiper is the three carbon brush motors that driven by relay, in the time of relay disconnection and adhesive, can produce electromagnetic interference effect car load EMC, and three carbon brush motors can produce unbalanced current simultaneously, and the noise when making the motor operation strengthens.

, publication number proposed a kind ofly to select windscreen wiper to scrape the method for water speed in being the patent application of CN101992746A according to automobile speed; This kind method is to gather speed information through wiper controller; It is just fast more that the speed of a motor vehicle is scraped water speed more soon, and the opposite speed of a motor vehicle is slow more, and it is just slow more to scrape water speed.This method can reduce some M/Cs to a certain extent, but sees that fundamentally it also is not how much to change the speed of scraping water according to rainwater on glass, can not react to the water that is splashed to suddenly on the Windshield simultaneously yet.

Summary of the invention

The purpose of this invention is to provide a kind of SCM Based rain blowing controlled system, when system was in the intelligent mode state, wiper can be according to the speed of how much selecting to scrape water of the water yield on the Windshield.

SCM Based rain blowing controlled system according to the invention; Comprise master controller, rain shaving electrical machine and combined switch; Also comprise windscreen wiper position transduser, rain sensor, Logic control module, MOSFET driver module and H bridge motor-drive circuit; Master controller is electrically connected with combined switch, windscreen wiper position transduser, rain sensor and Logic control module respectively; Logic control module is electrically connected with the MOSFET driver module, and the MOSFET driver module is electrically connected with H bridge motor-drive circuit, and H bridge motor-drive circuit is electrically connected with rain shaving electrical machine.

Rain blowing controlled system according to the invention also is provided with intelligent mode except being provided with fast mode, low-speed mode and stop mode.Under intelligent mode, be divided into two kinds of situation: a kind of is that to scrape aqueous mode continuously be that the windscreen wiper arm is to scrape water continuously, and another kind of situation is intermittently to scrape water, carries out at regular intervals between windscreen wiper in this case once to scrape hydrodynamic(al) and do.These two kinds of patterns also are to determine according to the water yield on the Windshield, so these two kinds of patterns automatically switch at any time at work.When system breaks down under intelligent mode, can manually select fast mode or low-speed mode, avoid occurring the problem that causes windscreen wiper to be failure to actuate or to act frequently because of sensor fault according to the rainfall situation.Fast mode and low-speed mode do not select to scrape water speed through the information of rain sensor, but two fixing water speeds of scraping.Only master controller just receives the signal of rain sensor under intelligent mode, and confirms that through an algorithm windscreen wiper scrapes the speed of water according to this signal.The mode that the change rain shaving electrical machine is scraped water speed is that the PWM that adjusts output signal realizes that rainfall hour dutycycle is little, and dutycycle was big when rainfall was big.

Rain blowing controlled system according to the invention is owing to be provided with intelligent mode; Can scrape water speed according to how many automatic selections of the water yield on the Windshield; Thereby reduced the frequency that chaufeur is manually operated wiper switch, reduced the generation of wet traffic accident, guaranteed the rainy day traffic safety.What the motor-driven of rain blowing controlled system of the present invention adopted is the H bridge circuit that is made up of N channel enhancement FET; This circuit can be realized rotating and reverse of rain shaving electrical machine; Reduce to the intensity of connecting rod and to the requirement of installing space; Abandoned the mode that adopts the relay drive motor simultaneously, actv. has reduced the electromagnetic interference that system is produced, and has improved car load EMC.

Description of drawings

Combine accompanying drawing that the present invention is done further explain at present.

Fig. 1 is the block diagram of SCM Based rain blowing controlled system according to the invention;

Fig. 2 is the software flow pattern of control system of the present invention;

Fig. 3 is the diagram of circuit of control system of the present invention under intelligent mode.

The specific embodiment

As shown in Figure 1; This SCM Based rain blowing controlled system is made up of master controller, rain shaving electrical machine, combined switch, windscreen wiper position transduser, rain sensor, Logic control module, MOSFET driver module and H bridge motor-drive circuit; Master controller is electrically connected with combined switch, windscreen wiper position transduser, rain sensor and Logic control module respectively; Logic control module is electrically connected with the MOSFET driver module; The MOSFET driver module is electrically connected with H bridge motor-drive circuit, and H bridge motor-drive circuit is electrically connected with rain shaving electrical machine.Master controller receives the signal of combined switch, makes system works at fast mode, low-speed mode, intelligent mode and stop mode.Master controller receives the signal of rain sensor simultaneously, controls the speed of rain shaving electrical machine and whether gets into the intermittent mode in the intelligent mode.

Have only when Pattern Select Switch at intelligence shelves, and the pulse count that master controller receives in 60 milliseconds is between 1 to 3 the time, system just is operated in clearance mode.

As shown in Figure 2, when mode switch was selected fast mode, the master controller output duty cycle was that 90% pwm signal calls the motor-driven program under the continuous mode simultaneously; When Pattern Select Switch was selected low-speed mode, the master controller output duty cycle was that 60% pwm signal also calls the motor-driven program under the continuous mode simultaneously; What select when Pattern Select Switch is intelligent mode, and system gets into the intelligent drives pattern; When select that switch selects be stop mode the time, master controller stops pwm signal.

Control flow chart under the above-mentioned intelligent mode is as shown in Figure 3, begins to receive the impulse singla of rain sensor input when rotor switch system under intelligent mode.When the pulse count that receives in 60 milliseconds windscreen wiper greater than 3 time is scraped water continuously, starter motor drive program and according to the water speed of scraping of pulse count decision rain shaving electrical machine; Intermittently scrape aqueous mode when 60 milliseconds of pulse counts that receive system between 1 to 3 gets into, the every operation one-period counting of program this moment once starts a motor-driven program when counting reaches 200 times, and windscreen wiper is scraped the water one-period; When the pulse count that receives in 60 milliseconds during less than 1, when thinking on the Windshield, system do not have rain this moment, and system gets into standby mode, and the windscreen wiper arm can not move.

Increased the secondary reset function in this embodiment, after the windscreen wiper arm was accomplished scraping water and stopping of one-period, rain shaving electrical machine can reverse and make the windscreen wiper arm toward scrape angle of water direction rotation next time.Prevent to cause without rain brush for a long time when starting wiper doctrine not reverse with regard to actv. so next time, produced the situation of beating.

Need to prove that select switch is in intelligent mode following time, no matter be in and intermittently scrape aqueous mode or stop under the situation of standby mode, on Windshield in case have water so system will carry out the switching of corresponding modes.

Claims

1. SCM Based rain blowing controlled system; Comprise master controller, rain shaving electrical machine and combined switch; It is characterized in that: also comprise windscreen wiper position transduser, rain sensor, Logic control module, MOSFET driver module and H bridge motor-drive circuit; Master controller is electrically connected with combined switch, windscreen wiper position transduser, rain sensor and Logic control module respectively; Logic control module is electrically connected with the MOSFET driver module, and the MOSFET driver module is electrically connected with H bridge motor-drive circuit, and H bridge motor-drive circuit is electrically connected with rain shaving electrical machine.