Modernization of control system of panoramic windshield wipers with independent electric drive

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Abstract

BACKGROUND: The application of windshield wipers with independent electric drive allows eliminating the mechanical connection between them out of the vehicle design, freeing up space for installing various equipment. In this case, the electric drive control system is required to coordinate the motion of the windshield wipers in order to eliminate or prevent their intersection. Such an electric drive must have performance characteristics that meet standards and use standard hardware, in particular, sensors and an on-board electrical network.

AIM: Modernization of the previously developed control system for panoramic windshield wipers with an independent electric drive, intended to increase the frequency of their continuous cyclic motions while maintaining the composition of the hardware and basic operating principles.

METHODS: To modernize the electric drive control system of windshield wipers, methods of system analysis, software development and debugging methods, as well as experimental research methods were used.

RESULTS: Analysis of previously applied technical solutions showed that the coordination algorithm with opposite motion of windshield wipers leads to deep control of voltages feeding individual electric motors and, consequently, to a significant reduction in their values averaged over the motion cycle. Therefore, to increase the frequency of continuous cyclic motions of windshield wipers with independent electric drive, their antiphase motion is used with the original algorithm of coordination implemented in software without any change of the hardware parts. The use of reversible power converters feeding electric motors allows the windshield wipers to be brought out of positions that lead to intersection without reversing the direction of their rotation.

CONCLUSION: The modernized control system of independent electric drive of windshield wipers has demonstrated the fundamental achievability of the frequency of their antiphase continuous cyclic motions on a bus windshield that meets the standards.

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About the authors

Igor S. Polyuschenkov

Rubicon–Innovation

Author for correspondence.
Email: polyushenckov.igor@yandex.ru
ORCID iD: 0000-0001-6023-9927
SPIN-code: 9795-8775

Cand. Sci. (Engineering), Engineer

Russian Federation, Smolensk

References

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Supplementary files

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2. Fig. 1. The design of the mechanism of panoramic windshield wipers [1]: С1, passenger side wiper; С2, driver side wiper; ЭД1, electric motor of the passenger side wiper; ЭД2, electric motor of the driver side wiper; ЧР1, worm gear of the passenger side wiper; ЧР2, worm gear of the driver side wiper; Дн1, direction sensor of shaft rotation of the passenger side wiper; Дн2, direction sensor of shaft rotation of the driver side wiper; ДП1, shaft position sensor of the passenger side wiper; ДП2, shaft position sensor of the driver side wiper; СУЭП, control system of electric drive; A–G, intermediate angular positions of windshield wipers; xmin, extreme lower position of the driver side wiper; xmax, extreme upper position of the driver side wiper; ymin, extreme lower position of the passenger side wiper; ymax, extreme upper position of the passenger side wiper; Δφ1, motion range of the passenger side wiper; Δφ2, motion range of the driver side wiper; α1 and α2, boundaries of the area of windshield wipers potential intersection; Uдн1, output signal of the direction sensor of shaft rotation of the passenger side wiper; Uдп1, output signal of the shaft position sensor of the passenger side wiper; U1, supply voltage of the electric motor of the passenger side wiper; Uдн2, output signal of the direction sensor of shaft rotation of the driver side wiper; Uдп2, output signal of the shaft position sensor of the driver side wiper; U2, supply voltage of the electric motor of the driver side wiper.

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3. Fig. 2. Time-domain graphs of angular positions of the passenger side wiper φ1 and the driver side wiper φ2 in the relation to the border α of the area of their potential intersection: a, during antiphase motion; b, during motion in opposite directions.

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4. Fig. 3. Power converter for supplying of direct current electric motor: a, circuit; b, time-domain diagrams of transistors VT1–VT4 operation at positive and negative polarity of output voltage (ЭД1, electric motor; ДТ1, current sensor; L1, additional inductance; СЦ1, conforming circuit; ТМA and TMB, transistor modules; EnA and EnB, logic control signals; PWMA and PWMB, control signals with pulse-width modulation; Uпит, supply voltage of the power converter; I1, current; Uдт1, output signal of the current sensor; U1, supply voltage of the electric motor; t, time).

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5. Fig. 4. Control system of electric drive of windshield wipers: a , dependences of rotation speeds ω1 and ω2 of electric motors on their electromagnetic torques M1 and M2: 1, natural; 2, stiff; 3, soft (ωхх, idle rotation speed; Mст, locking torque; Mс, torque of load when moving on dry glass; Mв, torque of load when moving on wet glass; ωс.з, rotation speed when moving on dry glass with positive current feedback; ωс.е, rotation speed when moving on dry glass without positive current feedback; ωв.з, rotation speed when moving on wet glass with positive current feedback; ωв.е, rotation speed when moving on wet glass without positive current feedback; Δωв.з, Δωс.з, Δωв.е, Δωс.е, differences of rotation speed); b, influence of value of positive current feedback coefficient kпт on dynamic of motion in dependence of time t when kпт1 < kпт2 < kпт3: ωз, given rotation speed of electric motor; t, time.

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6. Fig. 5. Experimental graphs of the coordinates of windshield wipers electric drive: φ1 and φ2, angular positions of the windshield wipers; γ1 and γ2, duty cycles of voltages supplying electric motors; I1 and I2, currents of electric motors; γ0, given value of duty cycle; t, time.

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7. Fig. 6. Time diagram of signal for output of failure codes: T1, interval between pulse batches; T2, period of pulses; T3, period of pulse batches output; t, time.

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