M S System Vacuum

0008 However, the accumulators have very limited capacity to store vacuum, especially for a large vacuum power consumer like the braking system. Also preferred within this range, positioning of the vacuum tap less than or equal to about 150 mm from the intake valve, with less than or equal to about 100 mm more preferred.
The check valve 36 closes during the time of the engine cycle when the vacuum in the intake port is low. By using a check valve with fast response (i.
For cheap holiday gift idea example, in a vacuum power assisted braking system reduced available vacuum under certain engine conditions may be insufficient to provide the proper degree of brake feel for the vehicle operator. , within about 50 mm) to take advantage of the pressure variation within the engine. The method of claim 5, wherein the accumulator vacuum is pressure greater than or equal to about 90% of the peak engine vacuum pressure.
Preferably, the distance is about 25 mm to about 250 mm. The vacuum in the accumulator would be close to the peak vacuum at the port at each engine i hate black people cycle. The system of claim 18, wherein the means for directing has an open response time of less than or equal to about 10 ms.

0007 Check valves and vacuum accumulation typically is used for power assisted brake systems and also commonly is used for all other vacuum actuators of the vehicular vacuum power systems. 0003 In order to reduce the force required to operate a brake pedal cube jet radio set during the braking operation, the typical hydraulic braking system of an automotive vehicle is commonly provided with a booster unit, which utilizes compressed air, intake manifold vacuum (for a vacuum booster), or hydraulic pressure (for a hydraulic booster) as a power source. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this invention, but that the invention will include all embodiments falling within the scope of the appended claims. The net result is that the vacuum pressure in the accumulator will not be the average of the engine vacuum pressures, but will be closer to the maximum vacuum pressure seen each engine cycle. 2 is a graph plotting the vacuum available near the intake valve during a cycle of a typical spark ignition internal combustion engine; and0016 FIGS. The system of claim 14, wherein the slow response check valve is disposed greater than or equal to about 300 millimeters from the intake valve.

The method of claim 6, wherein the accumulator vacuum pressure is greater than or equal to about 95% of the peak engine vacuum pressure. The diameter could be selected to flow sufficient air without pressure drop, but not be so large as to promote deposit buildup on the check valve from combustion gases in the intake passage. The method of claim 3, wherein the accumulator vacuum pressure is greater than or equal to about 80% of a peak engine vacuum pressure.
0006 Intake manifold vacuum is commonly used as a power source for motor vehicle actuators, including brakes, ventilation, cruise control, and engine tuning valve controls.

Essentially, vacuum brake boosters utilize the manifold vacuum of the vehicle engine to establish the pressure differential within the booster. , an open/close response time of greater than 100 (milliseconds (ms), with greater than 100 ms typical).
, the fast response check valve) is positioned greater than or equal to about 50 mm from the intake valve. The system of claim 18, wherein the means for directing is disposed less than or equal to about 50 millimeters from the means for creating. 1 depicts a cylinder arrangement for an engine, comprising an inlet valve 30, an exhaust valve 32, and a cylinder 24 including a piston 26 connected to piston rod 28. The power piston is connected with a single or a plurality of diaphragms. In such a mode, the engine vacuum at idle is much lower than at a normal engine idle. 3-8 are graphical illustrations of intake manifold pressure (MAP) at various engine speeds and load conditions.

Accordingly, referring to the brakes as an example, it is the pressing and releasing of the brake pedal by the operator that depletes the vacuum, not holding the pedal.

1 TABLE Engine Speed (RPM) Delta Pressure (kPa)) 1,500 5-6 2,000 6 3,500 10 (at medium load) 3,500 14 (at high load) 4,000 16 4,500 180022 Optionally, a slow response check valve can be employed in the standard location near the brake booster as well as the fast responding check valve near the engine. As an example in a typical braking system, the accumulator is designed to provide a vacuum boost for 2 or 3 pedal presses after the available engine vacuum no longer is adequate. The method of claim 7, further comprising employing the accumulator vacuum pressure to operate power brakes. . A brake system, comprising: a vacuum accumulator in operable communication with an actuating piston in an engine cylinder; a conduit including a fast response check valve adapted to permit airflow in one direction, from the engine cylinder, wherein the fast response check valve has an open response time of less than or equal to about 25 ms; and a cylinder head including a combustion chamber, an intake valve, a valve bowl area, and an intake runner portion, wherein the cylinder head is adapted to receive a first end portion of the conduit at a location suitable for transmitting a vacuum generated during engine operation through the conduit, and wherein the second end portion of the conduit is in fluid communication with the inlet provision on the vacuum accumulator. BRIEF DESCRIPTION OF THE DRAWINGS0013 Referring now to the drawings, wherein like custom furniture manufactured upholstered elements are numbered alike in the several figures:0014 FIG.
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By having a check valve that can open during this time, it is possible to achieve a higher vacuum in an accumulator than would be otherwise possible. 0004 Engine manifold vacuum-actuated brake boosters are well known in the industry and have been used in automotive vehicles for many years. When the intake valve on the nearby cylinder opens, the pressure drops (vacuum increases). Many vehicles additionally provide a brake assist system in which the force applied to the brake pedal by the operator is amplified by a preset gain and the amplified force is transferred to the hydraulic brake system.
The system of claim 10, wherein the first portion of the conduit is connected to the valve bowl area.
The method of claim 3, wherein the open response time is less than or equal to about 10 ms.
0025 While the invention has been described with reference to an exemplary embodiment it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. DESCRIPTION OF THE PREFERRED EMBODIMENT0017 Disclosed are systems for augmenting the amount of vacuum available in an engine, e. , the fast response check valve) to the intake port on the cylinder may be less foot happy movie picture than or equal to about 250 millimeters (mm).

The system of claim 15, wherein the fast response check valve is disposed less than or equal to about 50 millimeters from the intake valve.
0010 In one embodiment, a method for operating a vehicle vacuum system comprises: introducing fuel to an engine cylinder, combusting the fuel, forming an engine vacuum, opening a check valve when the engine vacuum pressure exceeds an accumulator vacuum pressure, wherein the check valve is less than or equal to about 150 mm from an intake port in the cylinder and in fluid communication with a pressure accumulator, and closing the check valve when the engine vacuum pressure is less than the accumulator vacuum pressure, wherein the check valve has an open/close response time of less than or equal to about 25 ms. , the engine intake port) because the check valve is packaged in the brake booster.

0012 The above-described and other features will be appreciated and understood by those skilled in the art from the following detailed description, drawings, and appended claims. The alternative of incorporating a separate vacuum pump system would be costly and energy inefficient. Brake boosters generally comprise a booster housing having a single power piston which is axially movable by differential pressure. In one embodiment, a vehicle vacuum system comprises: an engine cylinder including a piston in mechanical communication with a piston rod, wherein the cylinder has a combustion area, an intake port with an intake valve, and an exhaust valve, a vacuum port disposed in operable communication with the cylinder, wherein the vacuum port is located in fluid communication with the intake port and is in fluid communication with a pressure accumulator, and a check valve disposed less than or equal to about 150 mm from the intake port, wherein the check valve has an open response time of less than or equal to about 25 ms. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof.