DE102007046145A1 - Windshield washer system for vehicle, has jet nozzle and pump, by which jet nozzle supplies water from holding container, and pressure of distributed water is controlled or regulated - Google Patents

Abstract

The windshield washer system (1) has a jet nozzle (4) and a pump (3), by which the jet nozzle supplies water (W) from a holding container (2). A pressure (p-W) of the distributed water is controlled or regulated, and the water is supplied from the jet nozzle in the direction of a windshield (5) of the vehicle. A supply voltage (U-V) of the pump is varied depending on a speed (v) of the vehicle and/or on an inflow velocity of a head wind for controlling or regulating the pressure.

Description

The The invention relates to a windscreen washer system for a motor vehicle, comprising at least one spray nozzle and a pump by means of which the spray nozzle water is supplied from a storage container, being a pressure of the spray nozzle towards a windshield the water distributable water controllable and / or regulated is.

The spray nozzles The windscreen washer of a motor vehicle are usually solid set so that a speed varies depending good wetting of the windscreen results. Is the wetting in the state maximum, is at the same setting and high speed wets only a lower area of the windshield. Is the spray nozzle on the other hand adjusted so that the windscreen at high speed preferably Completely is wetted in the state, a large part of the water on Roof of the motor vehicle or above sprayed away.

From the DE 197 50 022 B4 a windscreen washer system for vehicles is known, comprising a water tank, spray nozzles and a pump, wherein the pump promotes water from the water tank to the spray nozzles, the pressure depending on the approach speed of the airstream relative to the vehicle is controllable and / or controllable, wherein between the pump and the spray nozzles at least one pressure regulating valve for controlling or regulating the pressure is arranged.

It It is an object of the invention to provide an improved windscreen washer system for a To indicate motor vehicle.

The The object is achieved by a windscreen washer with the features of claim 1.

advantageous Further developments are the subject of the dependent claims.

A Windscreen washer according to the invention for a Motor vehicle comprises at least one spray nozzle and a pump by means of that of the spray nozzle Water from a storage tank can be fed. A pressure of the spray nozzle in the direction of a windscreen of the motor vehicle water distributable is controllable and / or controllable.

To the Controlling and / or regulating the pressure becomes a supply voltage the pump at least in dependence from a speed of the motor vehicle and / or a flow velocity a wind varies.

Advantageous is doing that the windscreen at any speed of the motor vehicle and in the state of large area and evenly wetted without inadvertently throwing water on the roof of the motor vehicle, about that away or even through an open one Sunroof gets inside the vehicle. By the variation The supply voltage can be applied to a pressure regulating valve as an additional Component are omitted, thereby saving costs. advantageously, the pressure is dependent varies by speed, since the speed anyway is detected. For the Varying depending on from the flow velocity the wind are additional Sensors required. The pump is preferably designed so that they with variable supply voltage, for example in one area from 70% to 100% of a nominal voltage can work reliably. The control The pump is preferably carried out via a semiconductor device.

in the Below is an embodiment of the Invention explained in more detail with reference to a drawing.

In this shows:

1 a block diagram of a windscreen washer with a pump and a control unit.

In 1 is a block diagram of a windscreen washer 1 shown for a motor vehicle. The windscreen washer 1 includes a filled with water W reservoir 2 , a pump 3 and two spray nozzles 4 , From the storage container 2 is water W from the pump 3 sucked and with a pressure p _W the spray nozzles 4 can be fed, the water W as large as possible and evenly on a windshield 5 inject the motor vehicle.

Depending on a speed v of the motor vehicle is by means of a control unit 6 a supply voltage U _{V of} the pump 3 controllable and / or controllable. Depending on this supply voltage U _V , the pressure p _{W changes} , so that at different speeds v the largest possible area of the windscreen 5 is wetted, with as little water W is sprayed over it. The speed v is determined anyway in the motor vehicle for display in the tachometer and can be provided by a corresponding sensor.

Alternatively, the control unit 6 the supply voltage U _V and thus the pressure P _W vary depending on a flow velocity of a wind.

The supply voltage U _{V of} the pump 3 and thus the pressure p _W of the spray nozzles 4 leaking water W may also be varied depending on a position of a sunroof (not shown).

For example, the pump 3 be acted upon at high speed v with a supply voltage U _V , which corresponds to 100% of a nominal voltage. At standstill of the motor vehicle, the pump 3 For example, supplied with 75% of the rated voltage. If the sunroof is open in the state, the supply voltage U _{V is} lowered, for example, to 70%, wherein to avoid the penetration of water W into the interior of the motor vehicle on a wetting of the uppermost regions of the windshield 5 is waived.

In addition, can a duration of delivery of Water W in dependence from an outside temperature be varied. For example, water becomes longer at higher outside temperature W promoted as at low outside temperature, to compensate for the faster evaporation of the water W.

Further, a device for detecting a degree of contamination of the windscreen 5 For example, a camera provided and the supply of water W and / or the duration of the supply depending on the degree of contamination can be influenced.

There may be a different number of spray nozzles 4 be provided.

A such windscreen washer is in principle also for use a rear window or on a headlight suitable.

1

Washer

2

reservoir

3

pump

4

nozzle

5

windscreen

6

control unit

p _W

print

U _V

supply voltage

W

water

Claims (4)

Windscreen washer system ( 1 ) for a motor vehicle, comprising at least one spray nozzle ( 4 ) and a pump ( 3 ), by means of which the spray nozzle ( 3 ) Water (W) from a reservoir ( 1 ) is fed, wherein a pressure (p _W ) of the spray nozzle ( 4 ) in the direction of a windshield ( 5 ) of the motor vehicle of distributable water (W) is controllable and / or controllable, characterized in that for controlling and / or regulating the pressure (p _W ) a supply voltage (U _V ) of the pump ( 3 ) is variable at least in dependence on a speed (v) of the motor vehicle and / or a flow velocity of a traveling wind. Windscreen washer system ( 1 ) according to claim 1, characterized in that the supply voltage (U _V ) of the pump ( 3 ) is variable in response to a position of a sunroof. Windscreen washer system ( 1 ) according to one of claims 1 or 2, characterized in that a duration of the supply of water (W) in dependence on an outside temperature is variable. Windscreen washer system ( 1 ) according to one of claims 1 to 3, characterized in that a device for detecting a degree of contamination of the windscreen ( 5 ) and the supply of water (W) and / or the duration of the supply depending on the degree of contamination can be influenced.