Air suspension system and camera cleaning system
阅读说明：本技术 空气悬架系统以及相机清洗系统 (Air suspension system and camera cleaning system ) 是由 小山昌喜 堀田海斗 初濑涉 伊藤勉 河合义则 铃木尚礼 于 2018-10-10 设计创作，主要内容包括：本发明提高行程控制对施加至线性压缩机的压力变动的跟随性、抑制压力降低引起的行程增加、防止活塞碰撞以及减少死容积来增加流量,由此提供一种高可靠高效率的车辆的空气悬架系统。为实现这一目的,本发明的空气悬架系统具备：空气悬架,其供给排出压缩空气来调整长度；压缩机主体,其活塞在气缸内往复运动而压缩空气；线性马达,其使所述活塞往复运动；气罐,其与所述空气悬架或所述压缩机主体连接,储存压缩空气；电磁阀,其对所述空气悬架或所述气罐进行开闭；以及逆变器,其根据该电磁阀的开闭状态来变更供给至所述线性马达的电力,对所述活塞进行位置控制。(The present invention provides an air suspension system for a vehicle with high reliability and high efficiency by improving the followability of stroke control to pressure variation applied to a linear compressor, suppressing an increase in stroke due to a decrease in pressure, preventing collision of pistons, and reducing a dead volume to increase a flow rate. To achieve this object, an air suspension system according to the present invention includes: an air suspension for supplying and discharging compressed air to adjust the length; a compressor main body in which a piston reciprocates in a cylinder to compress air; a linear motor that reciprocates the piston; a gas tank connected to the air suspension or the compressor body, storing compressed air; an electromagnetic valve that opens and closes the air suspension or the air tank; and an inverter for changing the power supplied to the linear motor according to the open/close state of the electromagnetic valve, and controlling the position of the piston.)
1. An air suspension system is characterized by comprising:
an air suspension for supplying and discharging compressed air to adjust the length;
a compressor main body in which a piston reciprocates in a cylinder to compress air;
a linear motor that reciprocates the piston;
a gas tank connected to the air suspension or the compressor body, storing compressed air;
an electromagnetic valve that opens and closes the air suspension or the air tank; and
and an inverter for changing the electric power supplied to the linear motor according to the open/close state of the electromagnetic valve, and controlling the position of the piston.
2. An air suspension system is characterized by comprising:
an air suspension for supplying and discharging compressed air to adjust the length;
a compressor main body in which a piston reciprocates in a cylinder to compress air;
a pressure sensor for detecting pressure information of the compressor main body;
a linear motor that reciprocates the piston;
a gas tank connected to the air suspension or the compressor body, storing compressed air;
an electromagnetic valve that opens and closes the air suspension or the air tank; and
and an inverter for changing the power supplied to the linear motor based on the pressure information of the compressor body, and controlling the position of the piston.
3. An air suspension system is characterized by comprising:
an air suspension for supplying and discharging compressed air to adjust the length;
a compressor main body in which a piston reciprocates in a cylinder to compress air;
a linear motor that reciprocates the piston;
an electromagnetic valve that opens and closes the air suspension; and
and an inverter for changing the electric power supplied to the linear motor according to the open/close state of the electromagnetic valve, and controlling the position of the piston.
4. An air suspension system according to any one of claims 1 to 3,
the position control of the piston is an adjustment of the amplitude center position or amplitude of the piston.
5. An air suspension system according to any one of claims 1 to 3,
further, the air suspension device is provided with a supply/discharge switching valve for switching the air inflow direction to the air suspension or an exhaust passage opening/closing valve for opening/closing an exhaust passage,
the inverter changes the electric power supplied to the linear motor according to the open/close state of the supply/discharge switching valve or the exhaust passage opening/closing valve, and performs position control of the piston.
6. An air suspension system according to any one of claims 1 to 3,
further, the compressor is provided with a pressure sensor for measuring the pressure on the suction side or the discharge side of the compressor body,
the inverter changes the power supplied to the linear motor based on the measurement result of the pressure sensor, and performs position control of the piston.
7. An air suspension system according to any one of claims 1 to 3,
the air suspension is provided between a vehicle body and a wheel, and changes a vehicle height up and down, and the inverter changes electric power supplied to the linear motor according to the vehicle height measured by a vehicle height sensor, and controls a position of the piston.
8. An air suspension system according to any one of claims 1 to 3,
the air suspensions are front wheel side air suspensions provided between a vehicle body and front wheels and rear wheel side air suspensions provided between the vehicle body and rear wheels,
the inverter changes electric power supplied to the linear motor when compressed air is supplied to the front wheel side air suspension and when compressed air is supplied to the rear wheel side air suspension, and performs position control of the piston.
9. An air suspension system according to any one of claims 1 to 3,
the air suspensions are front wheel side air suspensions provided between a vehicle body and front wheels and rear wheel side air suspensions provided between the vehicle body and rear wheels,
the inverter changes electric power supplied to the linear motor to control the position of the piston when compressed air from the front wheel side air suspension is exhausted and when compressed air from the rear wheel side air suspension is exhausted.
10. A camera cleaning system is characterized by comprising:
a camera washer that sprays a cleaning liquid when supplied with and discharged with compressed air;
a compressor main body in which a piston reciprocates in a cylinder to compress air;
a linear motor that reciprocates the piston;
an electromagnetic valve that adjusts the amount of compressed air supplied to the camera washing machine; and
and an inverter for changing the electric power supplied to the linear motor according to the open/close state of the electromagnetic valve, and controlling the position of the piston.
Technical Field
The present invention relates to a compressed air system for controlling operations of various parts of a vehicle by controlling an amount of supplied compressed air, and more particularly to an air suspension system for adjusting a vehicle height of a vehicle such as a four-wheeled vehicle or a camera washing system for adjusting a discharge amount of a washing liquid for washing a lens surface of an onboard camera.
Background
As an air suspension system for adjusting the vehicle height of a vehicle, there is a system in which a reciprocating linear motor is used as a power source of a compressor for generating compressed air (patent document 1). Further, there is also a camera cleaning system for cleaning a lens surface of an in-vehicle camera by using compressed air (patent document 2).
For example, patent document 1 discloses "an air suspension system in which air compressed by a compressor is supplied to a plurality of air chambers interposed between a vehicle body side and a wheel side and performing vehicle height adjustment in accordance with supply and discharge of the air, wherein the compressor includes: a mover coupled to the piston and extending in a moving direction of the piston; and an armature that reciprocates the mover in the moving direction of the piston, as an "air suspension system that facilitates starting of the compressor under a condition where a differential pressure exists".
Disclosure of Invention
Problems to be solved by the invention
However, in patent document 1 in which a piston of a compressor is driven by linear motion using a linear motor, since the position of the top dead center and the bottom dead center of the piston is determined by drive control of the linear motor (stroke control of a mover), so-called free piston structure, in an air suspension system in which the load of the compressor changes at every moment, it is difficult to control the stroke in accordance with the load fluctuation, and in a sudden load change, the piston collides with the cylinder, and the discharge flow rate may decrease.
The present invention has been made in view of the above problems, and an object of the present invention is to provide a highly reliable and highly efficient air suspension system or camera washing system that prevents collision between a piston and a cylinder when a load decreases and reduces a dead volume when a load increases to increase a discharge flow rate by linear motor control that immediately follows a sudden change even when the load of a linear compressor suddenly changes.
Means for solving the problems
In order to solve the above problem, an air suspension system according to the present invention includes: an air suspension for supplying and discharging compressed air to adjust the length; a compressor main body in which a piston reciprocates in a cylinder to compress air; a linear motor that reciprocates the piston; a gas tank connected to the air suspension or the compressor body, storing compressed air; an electromagnetic valve that opens and closes the air suspension or the air tank; and an inverter for changing the power supplied to the linear motor according to the open/close state of the electromagnetic valve, and controlling the position of the piston.
Further, a camera washing system according to the present invention includes: a camera cleaning machine which supplies and discharges compressed air to discharge a cleaning liquid; a compressor main body in which a piston reciprocates in a cylinder to compress air; a linear motor that reciprocates the piston; an electromagnetic valve that opens and closes the air suspension; and an inverter for changing the power supplied to the linear motor according to the open/close state of the electromagnetic valve, and controlling the position of the piston.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, the air suspension system can be quietly and highly reliably controlled by preventing the collision of the piston with the cylinder by controlling the linear motor in accordance with the operating conditions of the linear compressor. Further, it is possible to provide an air suspension system capable of realizing a vehicle height adjustment with high efficiency and high response by reducing a dead volume and increasing a discharge flow rate. Further, it is possible to provide an air suspension system for a vehicle capable of realizing a mode operation such as a high-speed drive, an energy-saving operation, and a silent operation in accordance with a request from a driver or a host system.
Drawings
Fig. 1 is a configuration diagram of a general air suspension for a vehicle.
Fig. 2 is a circuit configuration diagram of an air suspension system of embodiment 1.
Fig. 3A is a sectional view (side view) showing the structure of the linear compressor of example 1.
Fig. 3B is a sectional view (front view) showing the structure of the linear compressor of example 1.
Fig. 3C is a comparison graph of the behavior of the compressor body of example 1.
Fig. 4A is a diagram showing changes in the pressure of the suspension and the gas tank during the air suspension operation in example 1.
Fig. 4B is a diagram showing changes in the suction pressure and the discharge pressure during operation of the air suspension according to embodiment 1.
Fig. 5 is a control block diagram of embodiment 1.
Fig. 6 is a circuit configuration diagram of an air suspension system of
Fig. 7 is a control block diagram of
Fig. 8 is a circuit configuration diagram of an air suspension system of
Fig. 9 is a circuit configuration diagram of an air suspension system of
Fig. 10 is a circuit configuration diagram of an air suspension system of
Fig. 11 is a circuit configuration diagram of an air suspension system of embodiment 6.
Fig. 12 is a circuit configuration diagram of an air suspension system of embodiment 7.
Fig. 13 is a circuit configuration diagram of a camera washing system of embodiment 8.
Detailed Description
Hereinafter, embodiments of the present invention will be described with reference to the drawings. The following is merely an example of the embodiment, and the invention is not intended to be limited to the specific embodiments described below. The present invention itself can be implemented in various forms in combination with the contents described in the claims.
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