451 results about "Discharge pressure" patented technology

The invention relates to the technical field of intelligent control, in particular to an intelligent slurry discharge pressure control method for underground cemented filling, which comprises the following steps of: 1, establishing a model capable of reflecting expected normal slurry discharge pressure under the current working condition according to parameters of the current working condition to obtain the expected normal slurry discharge pressure; 2, comparing the real-time measured slurry discharge pressure with the expected normal slurry discharge pressure, and judging whether abnormal rise exists or not; 3, setting an abnormal time window, and performing severity evaluation on the identified pressure abnormity by considering a time accumulation effect to obtain an abnormity severity index; and 4, according to the abnormal severity index, the slurry discharging flow is automatically adjusted to the target slurry discharging flow by adjusting the rotating speed of the control pump. According to the method, the safety guarantee level of the underground cemented filling pipeline conveying process is remarkably improved.

An improved heat pump including an integrated system for the management of refrigerant charge is provided. The integrated system actively adjusts charge allocation and thereby optimizes operational efficiencies in all modes of operation. In one embodiment, the integrated system includes three four-way valves, two expansion valves, two one-way check valves, and a suction line accumulator to optimize charge allocation. The four-way valves dictate the mode switch and refrigerant flow directions, and the expansion valves automatically allocate refrigerant mass in active components and store excess charge in an idle heat exchanger and suction line accumulator by controlling the compressor discharge pressure (equivalent to controlling condenser subcooling degree) as a function of the entering air and water temperatures. The integrated system provides seven working modes and is uniquely suited for spacing cooling, spacing heating, and water heating in both residential and commercial applications.

The invention provides an NMP (N-Methyl Pyrrolidone) purification process based on an NMP rectification system, the process is completed by matching a tail gas desorption tower, the space in the tower is divided into an adsorption bin and a desorption bin by arranging a middle box body, two groups of adsorption devices capable of alternately entering the two bins are mounted, and automatic switching of the adsorption devices is realized by utilizing a driving mechanism; when the adsorption efficiency of one group of adsorption devices is reduced, the adsorption devices are automatically transferred to the desorption bin for regeneration treatment, meanwhile, the other group of adsorption devices enter the adsorption bin to continue working, and in the desorption process, low-pressure saturated steam and hot nitrogen are adopted for purging, so that residual moisture is effectively removed, and the adsorption activity is recovered; compared with the prior art, the process has the advantages that gas exchange in the adsorption and desorption process is reduced, the sealing performance and the air pressure balance control capability of the system are improved, the process ensures continuous production, meanwhile, the energy consumption and the discharge pressure are remarkably reduced, and the NMP purification efficiency and the product quality are improved.

A pressure relief valve 855 comprising a cap 805 with an opening therein, a plunger 810 configured to fill the opening in the cap 805 and a spring 815 configured to hold the plunger against the cap. T

Systems and methods described herein provide a smart vacuum priming system for centrifugal pumps. The vacuum priming system includes a vacuum pump, a suction assembly, an electromagnetic clutch assembly, and a pressure sensor. The suction assembly provides fluid communication between the vacuum pump and a float box of the centrifugal pump. The electromagnetic clutch assembly selectively engages the vacuum pump, such that a drive shaft of the centrifugal pump also powers the vacuum pump when the clutch is on. The pressure sensor indicates when the centrifugal pump is in a primed state based on a discharge pressure of the centrifugal pump. When the pressure sensor indicates the main pump is in the primed state, the electromagnetic clutch decouples the vacuum pump from the drive shaft. When the pressure sensor indicates the main pump is not in the primed state, the electromagnetic clutch couples the vacuum pump to the drive shaft.

A compressor includes a housing, a first compression mechanism and a second compression mechanism disposed in the housing, and a housing cover fixed to the housing. Both the first compression mechanism and the second compression mechanism are configured to compress a working fluid from a suction pressure to a discharge pressure. The first compression mechanism includes a first cylinder housing having a first fluid storage plenum. The second compression mechanism includes a second cylinder housing having a second fluid storage plenum. The housing cover defines an intermediate-fluid port in fluid communication with the first fluid storage plenum via a first intermediate-fluid passage and the second fluid storage plenum via a second intermediate-fluid passage. Working fluid at an intermediate pressure enters the intermediate-fluid port. The intermediate pressure is greater than the suction pressure and less than the discharge pressure.

An electronically controlled regulator may include a pressure regulating valve, which may include a discharge pressure regulating unit that adjusts a pressure of a fluid by changing a distance between a valve body and a valve seat while reciprocating a valve shaft by a valve shaft moving structure using a feed screw, a slidable piston that receives a fluid pressure in a discharge pressure chamber, and a spring that constantly biases the valve shaft in a valve closing direction. At the time of valve closing, the fluid pressure received by the piston may be converted into a pressure load in a direction of pressing the valve body, and at a time of pressure adjustment, a positional deviation of the valve shaft due to a backlash provided at a meshing portion of the feed screw may be avoided by a biasing force of the spring.

According to the diaphragm compressor oil mass self-balancing system and the control method, the needed oil supplementing amount and the working state of a diaphragm compressor are calculated and judged through measurement data of exhaust pressure, transient oil pressure and the oil supplementing amount, and data are measured through a pressure sensor and a flow meter and transmitted to a control unit; the required oil supplementing amount is calculated, the working state of the diaphragm compressor is judged, the opening degree of a proportional overflow valve on an oil supplementing loop is controlled, accurate automatic control over the hydraulic oil amount of an oil cavity of the diaphragm compressor and dynamic balance of the oil amount are achieved, and the problem that an executing mechanism acts too frequently can be solved through the oil supplementing method; the overflow valve realizes the change of the oil discharge pressure along with the exhaust pressure, and avoids the problem caused by higher oil pressure. The problem that the diaphragm flaps the cylinder due to the fact that the oil quantity of the oil cavity is reduced under the conditions of starting, working condition change, piston ring abrasion and the like can be effectively solved.

The invention discloses an underground garage spontaneous combustion management and control system, method and device based on AGV carrying, and relates to the technical field of garage spontaneous combustion management and control. The underground garage spontaneous combustion management and control system based on AGV carrying comprises an AGV carrying module; a fire extinguishing analysis module; a smoke diffusion analysis module; and a smoke discharge response analysis module. According to the invention, the AGV carrying robot carries the abnormal vehicle to the safe room for fire extinguishing, then carries out fire extinguishing analysis on the abnormal vehicle in the safe room and judges whether to carry out smoke discharge pressure dynamic optimization or not, and then carries out smoke diffusion analysis on the abnormal vehicle in the safe room and judges whether to carry out smoke discharge speed influence dynamic optimization or not. And finally, the smoke exhaust device is subjected to response analysis and whether smoke exhaust control optimization is carried out or not is judged, so that the effect of improving the safety in underground garage vehicle spontaneous combustion control based on the AGV is achieved, and the problem of low safety in underground garage vehicle spontaneous combustion control based on the AGV in the prior art is solved.

The invention relates to the technical field of fracturing construction, in particular to a sand mixing and liquid supplying system, a sand mixing and liquid supplying control method and a sand mixing pry. The sand mixing and liquid supplying system comprises a water tank, a suction pump, a suction valve, a sand mixing tank, a discharge pump and a discharge valve which are connected in sequence; the controller is electrically connected with the suction pump, the suction valve, the discharge pump, the discharge valve and the fracturing sand supply device. In the fracturing construction process, the controller adjusts the suction flow of the suction pump, the opening degree of the suction valve, the discharge flow of the discharge pump and the supply flow of the fracturing sand supply device according to the discharge flow of the discharge port of the discharge valve, and various water tanks and working conditions are automatically adapted through intelligent control of the controller; the opening degree of the suction valve is automatically adjusted according to different discharge flows of the discharge pump, the rotating speed of the suction pump is automatically adjusted through a control algorithm, the liquid level of the mixing tank is stably controlled, intelligent control over the liquid level and discharge pressure of the mixing tank is achieved, manual control is completely replaced, and equipment automation is achieved.

The utility model provides a beverage container, and belongs to the technical field of containers. The technical problem that an existing beverage container is large in liquid outlet pressure is solved. The beverage container comprises a barrel body, a connector pipe and a wine spear installed at a barrel opening of the barrel body, the wine spear comprises a liquid outlet valve element, one end of the connector pipe is inserted into the wine spear downwards and abuts against the liquid outlet valve element, a gas cylinder is fixedly arranged in the barrel body and comprises an exhaust valve, the periphery of the connector pipe is provided with a protruding column arranged downwards, and the protruding column is fixedly connected with the liquid outlet valve element. The gas cylinder is connected with an exhaust valve used for controlling the gas cylinder to be opened and closed, and the protruding column moves downwards to trigger the exhaust valve to be opened. According to the beverage container, the gas cylinder is deflated only when beverage is discharged, and it is guaranteed that the pressure in the barrel is not too large.

The invention discloses a linear cooling control method of an environmental test box and the environmental test box. The method comprises the following steps: acquiring the temperature in a to-be-controlled environment test box, the outlet temperature of an evaporator, the liquid supply temperature of a condenser, the suction pressure of a variable-frequency compressor and the exhaust pressure of the variable-frequency compressor; according to the temperature in the box, the evaporator outlet temperature, the condenser liquid supply temperature, the frequency conversion compressor suction pressure, the frequency conversion compressor exhaust pressure and preset parameters, the frequency conversion compressor rotating speed, the electronic expansion valve opening degree, the evaporator fan rotating speed and the condenser fan rotating speed of the to-be-controlled environment test box are calculated; based on the calculated rotating speed of the inverter compressor, the calculated opening degree of the electronic expansion valve, the calculated rotating speed of the evaporator fan and the calculated rotating speed of the condenser fan, the inverter compressor, the electronic expansion valve, the evaporator fan and the condenser fan of the to-be-controlled environment test box are controlled respectively, and linear cooling control over the to-be-controlled environment test box is achieved.

To put new thought to a control method, and to obtain good operability, upon providing a control circuit for option hydraulic actuator in a hydraulic circuit for a working machine. There is provided an option merging oil passage that allows the discharge oil of the first, second hydraulic pumps to be merged thereinto, and the option merging oil passage is provided with an option control valve and a compensator valve, and is configured such that a variable relief valve is connected to a signal pressure introduction oil passage connected to the compensator valve, a supply pressure to an option hydraulic actuator can be variably controlled by changing a relief setting pressure of the variable relief valve; on the other hand, distributed flow rate computation with respect to the other hydraulic actuators, opening area control of the option control valve, the other hydraulic actuators control valves, and discharge pressure control of the first, second hydraulic pumps are optimized.

To put new thought to a control method, and to obtain good operability, upon providing a control circuit for option hydraulic actuator in a hydraulic circuit for a working machine. There is provided an option merging oil passage that allows the discharge oil of the first, second hydraulic pumps to be merged thereinto, and the option merging oil passage is provided with an option control valve and a compensator valve, and is configured such that a variable relief valve is connected to a signal pressure introduction oil passage connected to the compensator valve, a supply pressure to an option hydraulic actuator can be variably controlled by changing a relief setting pressure of the variable relief valve; on the other hand, distributed flow rate computation with respect to the other hydraulic actuators, opening area control of the option control valve, the other hydraulic actuators control valves, and discharge pressure control of the first, second hydraulic pumps are optimized.

A vehicle (400), a control method for a thermal management system thereof, an apparatus and a storage medium. The thermal management system of the vehicle comprises a cooling liquid circulation system (100) and an air conditioning system (200); the air conditioning system (200) comprises a compressor (8), a fresh air regulation assembly, a heat exchanger (4) and an air blower; the cooling liquid circulation system (100) comprises a heat exchanger (4) and a fan (13) provided corresponding to a heat dissipation assembly (1); the air conditioning system (200) and the cooling liquid circulation system (100) exchange heat by means of the heat exchangers (4). The method comprises: acquiring the discharge pressure of the compressor (8); and when it is determined that the discharge pressure of the compressor (8) exceeds a preset pressure threshold value, adjusting one or more of operating parameters of the compressor (8), the fresh air regulation assembly, the air blower and the fan (13), such that the discharge pressure of the compressor (8) is lower than the preset pressure threshold value. When a high-pressure protection function is triggered, by means of multiple measures or a combination of multiple measures, the control method achieves effective protection of system operation while satisfying the comfort requirements of passengers.

In a fuel supply system that supplies gaseous fuel to the engine of a vehicle, the fluid pressure of the discharged gaseous fuel can be adjusted by electronic control, and the fluid pressure of the gaseous fuel can be safely released in the event of a malfunction such as a power supply failure. [Solution] In a fuel supply system 100 that supplies gas fuel to an engine 6, the system includes an electronically controlled regulator 3 that reduces the introduced gas fuel to a set pressure and discharges it, a pressure sensor 7 that detects the fluid pressure of the gas fuel after reduction, and a normally open electromagnetic relief valve 8 provided downstream of the pressure regulating valve of the electronically controlled regulator 3. The electromagnetic relief valve 8 opens when the fluid pressure detected by the pressure sensor 7 reaches a pressure threshold or when the system is not energized, releasing the gas fuel outside the system.

The invention provides a graded anti-explosion warehouse, and relates to the technical field of storage and transportation, the graded anti-explosion warehouse comprises a warehouse body, an explosion venting roof structure, a first explosion venting structure, a second explosion venting structure and a third explosion venting structure, the explosion venting roof structure is arranged on the warehouse body in a liftable manner, and a pressure relief gap can be formed between the explosion venting roof structure and the warehouse body; the first explosion venting structure can vent explosion and discharge pressure when the pressure of the storage cavity reaches a first pressure value; the second explosion venting structure can venting explosion and discharging pressure when the pressure of the storage cavity reaches a second pressure value, the third explosion venting structure is connected with the bin body and the explosion venting roof structure, and the third explosion venting structure can be disconnected to release the explosion venting roof structure when the pressure of the storage cavity reaches a third pressure value. A graded explosion venting structure is formed, when an explosion dangerous case occurs, the first explosion venting structure, the second explosion venting structure and the third explosion venting structure are preferentially damaged instead of the warehouse main body structure, so that the subsequent repair cost is reduced, and the warehouse can quickly recover production after being checked and repaired.

The present invention relates to an automotive pendulum-slider pump (10, 10') for providing pressurized lubricant. The automotive pendulum-slider pump (10, 10') includes a non-rotatable rotor housing (12); a rotatable rotor ring (20, 20') that rotates within the rotor housing (12) and surrounds a pumping chamber (25) having an intake opening (18) and an exhaust opening (19); a rotatable rotor hub (35) that is rotatably connected to the rotor ring (20, 20'); and a plurality of pendulum blades (30) arranged at equal angles on the circumference of the rotor ring (20, 20') and each blade (30) is pivotally hinged by a separate pendulum hinge (32) at the rotor ring (20, 20'). The vanes (30) divide the fluid in the pumping chamber (25) into multiple pumping compartments (40), wherein the pumping chamber (25) is equipped with an automatically switching pressure matching valve (50, 50') for pre-opening the fluid connection between at least one pre-openable pumping compartment (40B) and the discharge opening (19) just before the pumping compartment (40B) has reached the discharge opening (19). The pre-opening fluid connection provides pressure matching between the pre-openable pumping compartment (40B) and the discharge pressure to reduce noise emissions caused by pressure pulsations resulting from sudden pressure equalization that occurs when the pumping compartment (40) reaches the discharge opening (19).

A method of controlling a pumping stage of a fracturing fleet at a wellsite with at least two electric frac pumps to increase the efficiency of the electric frac pumps comprises communicating an interim flowrate to the electric frac pumps and calculating an efficiency value from measured power from the VFD and measured flow rate, intake pressure, and discharge pressure. The method can increase a total efficiency of the fracturing fleet above a threshold efficiency value by iterating the interim setpoint from a first interim setpoint to a second interim setpoint for the electric frac pumps, wherein the second interim setpoint decreases the flowrate to the less efficient electric frac pumps and increases the flowrate an equal amount to the more efficient electric frac pumps.

A liquid supply system and its method. The system includes multiple external liquid storage barrels, a manifold block, a first liquid supply pipeline, a valve assembly, a buffer container, a second liquid supply pipeline, and a processor. The first liquid supply pipeline is connected between the external liquid storage barrels and the manifold block and is used to transport the liquid on each external liquid storage barrel to the manifold block. A valve assembly for controlling the liquid flow between the external liquid storage barrel and the manifold block is also provided thereon. The second liquid supply pipeline is connected between the manifold block and the buffer container. A pressure source for generating the liquid discharge pressure from the external liquid storage barrel to the buffer container and a detection unit for detecting the liquid condition on each external liquid storage barrel are provided thereon. When the external liquid supply is enabled, the liquid supply system can control the external liquid supply to the sample analysis device according to the load status of each sample analysis device.

The present application provides a capacity control valve with high control accuracy and excellent energy efficiency in normal control. The capacity control valve (V) has a valve housing (10) formed with a discharge port (12) through which a discharge fluid of a discharge pressure (Pd) passes, a suction port (13) through which a suction fluid of a suction pressure (Ps) passes, and a control port (13) through which a control fluid of a control pressure (Pc) passes; a rod (83) driven by a solenoid (80); and a main valve (50) composed of a main valve seat (10a) and a main valve core (51), the communication between the discharge port (12) and the control port (14) being opened and closed by the movement of the rod (83), the capacity control valve being provided with a CS valve (56) between the control port (13) and the suction port (14), the CS valve (56) being controlled by the dynamic pressure of the fluid flowing from the discharge port (12) to the control port (13) through the opening of the main valve (50).

A twin-fluid nozzle spray apparatus according to one aspect includes a gas regulator that outputs compressed gas at a predetermined pressure in a compressed-gas supply system, a positive displacement pump that includes a relief valve configured to feed pressurized liquid at a pressure exceeding a predetermined pressure in a pressurized-liquid supply system back to a liquid supply side, and outputs the pressurized liquid, a liquid regulator or a needle valve that outputs the pressurized liquid output by the positive displacement pump while maintaining a pressure of the pressurized liquid at a discharge pressure having a predetermined value, and a twin-fluid nozzle that mixes and sprays the compressed gas output by the gas regulator and the pressurized liquid output by the liquid regulator or the needle valve.

The utility model provides a ship, and relates to the technical field of water traffic tools. The ship comprises a ship body and an exhaust assembly, a first exhaust port is formed in the bottom of the ship body, and a second exhaust port is formed in the tail of the ship body. The exhaust assembly is arranged in the ship body and comprises a main exhaust pipe and a branch exhaust pipe, one end of the main exhaust pipe is connected to the first exhaust port, the other end of the main exhaust pipe is connected to an engine arranged in the ship body, one end of the branch exhaust pipe is connected to the main exhaust pipe, and the other end of the branch exhaust pipe is connected to the second exhaust port. When the ship sails, the exhaust gas emission pressure of the engine is large, exhaust gas is mainly exhausted into water from the first exhaust port in the bottom of the ship body through the main exhaust pipe, the noise reduction effect is achieved through seawater, noise caused by exhaust gas emission is reduced, and therefore a quieter and more comfortable ship taking environment is provided for a user.

To provide a scroll-type compressor capable of discharging a refrigerant from a back pressure chamber without depending on a position of a turning scroll during stop of an operation.SOLUTION: A scroll-type compressor 10 includes a housing 11, a support member 13 that supports a rotating shaft 15, a fixed scroll 25 and a turning scroll 26. The scroll-type compressor 10 includes a suction pressure region, a compression chamber 27, a discharge pressure region and a back pressure chamber 50. The back pressure chamber 50 communicates with the suction region by using an intermittent exhaust passage 60 and communicates with the discharge pressure region by using an exhaust passage 70. An exhaust valve enabling switching between an exhaust state and a non-exhaust state is disposed in the exhaust passage 70. The exhaust valve becomes the exhaust state when pressure of the back pressure chamber 50 is higher than that of the discharge pressure region. When stopped, the scroll-type compressor 10 can discharge the refrigerant in the back pressure chamber 50 by using the exhaust passage 70 even if the intermittent exhaust passage 60 and the suction pressure region are shut off by the turning scroll 26.SELECTED DRAWING: Figure 1

The application discloses an air conditioner control method and device, an air conditioner and a storage medium, and belongs to the technical field of air conditioners. The application obtains the discharge pressure and the return air pressure of the compressor; controls the operation of the flow regulating device according to the discharge pressure and the return air pressure, detects the discharge pressure and the return air pressure of the compressor in real time, then adjusts the flow regulating device according to the detected discharge pressure and return air pressure, adjusts the flow regulating device, and effectively avoids the situation that the compression ratio of the compressor is increased, further protects the compressor, and prolongs the service life of the compressor.

The present invention relates to a multi-condition high-temperature and high-pressure corrosion simulation experimental device and method, belonging to the field of oil and gas cementing. The device is composed of a nitrogen bottle, a corrosive medium storage tank, a flow pump and a maintenance / corrosion kettle. The maintenance / corrosion kettle includes a kettle body, a maintenance gland, a corrosion gland and a back-pressure upper cover. The side wall of the kettle body has a liquid inlet pressure port, a liquid discharge pressure relief port and an exhaust port. The maintenance gland and the kettle body form a closed kettle cavity for curing cement stone; the cement ring upper cover passes through the corrosion gland to form a sealed kettle cavity corrosion cement ring assembly. The method comprises: injecting the corrosive medium into the kettle through a flow pump and pressurizing it, so that the corrosive medium forms a circulation between the reactor and the storage tank, adjusting the pressure of the upper cavity and the kettle cavity to reach the required pressure difference, and ensuring that the cement stone and the corrosive medium form contact under different working conditions. The present invention can simulate the corrosion of the corrosive medium to the cement stone under various working conditions at one time, accurately reflect the corrosion law of cement stone in the well, and thus evaluate the corrosion resistance of the cement stone.

The application relates to an air conditioning unit which comprises a compressor, a heat exchanger assembly, a four-way valve and a controller, the controller being connected with the compressor, the four-way valve, a suction pressure sensor and a discharge pressure sensor, when the discharge pressure Pd and the suction pressure Ps satisfy Pd P1 and Pd-Ps

This invention provides a pump body assembly and a compressor. The pump body assembly includes a cylinder liner, a piston, and a muffler structure. The cylinder liner has an inlet and an outlet. The piston is slidably disposed within the cylinder liner to form a variable volume chamber, and the variable volume chamber is located in the sliding direction of the piston. The muffler structure is connected to the cylinder liner and has a muffler cavity. The cavity wall of the muffler cavity has a communication hole for communicating with the outlet, and the cavity wall also has a pressure relief port. When the piston is in the inlet position, the inlet communicates with the variable volume chamber; when the piston is in the outlet position, the outlet communicates with the variable volume chamber; and when the outlet pressure reaches a preset outlet pressure, the pressure relief port is opened. This invention solves the problems in the prior art where oil-containing refrigerant in the compressor severely affects the thermal efficiency of the refrigeration equipment, and where fluctuations in outlet pressure lead to an excessively high suction-to-discharge pressure ratio.

The invention discloses an emission pressure and concentration detection device after biomass boiler flue gas purification treatment, and belongs to the technical field of flue gas purification detection, the emission pressure and concentration detection device comprises two identical fixing pieces, the fixing pieces are movably connected with connecting pieces, and the connecting pieces are provided with detection pieces; the fixing piece comprises a mounting block, an inserting groove and a containing groove are formed in the mounting block, a rotating shaft is arranged in the containing groove, a rotating plate is rotationally connected to the rotating shaft, a sliding groove is further formed in the portion, in the inserting groove, of the mounting block, the rotating plate is matched with the sliding groove, and a mounting groove is further formed in one surface of the mounting block. By arranging the fixing piece and the connecting piece, when the device is used, the rotating plate is rotated firstly, at the moment, the mounting block is inserted into a pipe orifice rod piece of the smoke exhaust pipeline, after the rod piece is inserted into the inserting groove, the rotating plate is rotated reversely till the inserting groove is closed by the rotating plate through the sliding groove, and the device can be conveniently clamped on a similar rod body through the mounting block; installation and disassembly are very convenient, the detection piece extends into the smoke exhaust pipe, and the detection result is more accurate.

To provide a work vehicle capable of improving fuel economy by the control to switch modes between an economy mode and a standard mode at an appropriate timing, and capable of eliminating the troublesomeness of manually switching the modes between the standard mode and the economy mode.SOLUTION: A work vehicle 1 includes an engine 20, a first hydraulic pump 31, a second hydraulic pump 32, a travelling device 6, a work device 9, an operation device 5, an ECU 30, and a vehicle controller 7. The vehicle controller 7 transmits a control command in a standard mode to the ECU 30 when the travelling device 6 is stopped, discharge pressure from the second hydraulic pump 32 is a reference value U1 or more, and a first period T1 passes with an engine load factor of a predetermined upper limit E1 or more, transmits a control command in an economy mode to the ECU 30 when a second period T2 passes with the engine load factor of a predetermined lower limit or less, and transmits a control command in the standard mode to the ECU 30 when the travelling device 6 is actuated.SELECTED DRAWING: Figure 1