CN103742273A - Testing system for obtaining EVB (Exhaust Valve Brake) system performance and control strategy thereof - Google Patents

Abstract

The invention discloses a test system and its control strategy for obtaining the performance of the EVB system. The specific control strategy is as follows: firstly, the ECU of the vehicle is powered on, and the EVB system control switch is turned on without starting the engine; secondly, the control switch in the EVB system is controlled. The butterfly throttle valve is in the open working state or closed working state, and the spool action signal of the butterfly throttle valve is detected; finally, according to the spool switch signal, it is judged whether the spool meets the conditions for normal opening or closing. If the conditions are met, then Issue a control command for the spool to open or close normally; otherwise, issue a control command for the spool to open or close abnormally; this control strategy can measure the position of the butterfly throttle valve only when the ECU is powered and the engine does not start. The opening angle of different working states can realize the purpose of judging whether the spool can work normally, ensure the safety of the driver, and reduce the impact on the driver and the engine caused by the sudden drop of engine power when the butterfly throttle valve is braked during drive inspection. Wait for the shock.

Description

The Test System and Its Control Strategy Used to Obtain the Performance of EVB System

technical field

The invention relates to the technical field of vehicle braking, in particular to a test system for obtaining the performance of an EVB system and a control strategy thereof.

Background technique

The exhaust valve brake system (exhaust valve brake, hereinafter referred to as EVB) is an auxiliary brake device, which belongs to the engine retarder. It is based on the traditional butterfly valve exhaust valve brake system to further improve the performance of the engine. The purpose of braking effect.

EVB includes butterfly valve exhaust auxiliary braking device and diesel engine exhaust valve control actuator, both of which are related to each other and used at the same time. EVB braking is based on the traditional butterfly throttle valve exhaust auxiliary braking device. The butterfly valve is set on the exhaust pipe of the engine. When the EVB brakes, the butterfly throttle valve is closed, and the diesel engine Under the drag of gravity, it is similar to the work of a compressor. The exhaust gas pressure in the exhaust passage rises sharply, and the pressure wave generated by the exhaust of adjacent cylinders will cause the exhaust valve of the cylinder near the bottom dead center of the suction stroke to open uncontrollably. Open. EVB is to use the phenomenon that the exhaust valve is automatically opened by the pressure wave during the braking process. By adding a set of actuators to control the stroke of the exhaust valve, the exhaust valve can be kept open during the engine braking process to improve the performance of the engine. braking efficiency.

EVB can ensure the safety of vehicles driving on downhill roads in mountainous areas, reduce the frequency of use of the brake system, reduce the wear of the brake system, and prolong the replacement cycle of brake shoes; The air brake can also prevent the vehicle from skidding due to excessive deceleration. Although EVB braking cannot stop the vehicle in an emergency, it can achieve the purpose of stably decelerating the vehicle.

However, at present, it is only possible to detect whether the butterfly throttle valve in the EVB can work normally only when the engine is working. In order to judge whether the EVB is working normally or not. At this time, if the butterfly throttle valve in the EVB cannot work normally, the EVB will not be able to brake normally, and there is a great potential safety hazard for the vehicle in motion like this.

Therefore, how to know whether the butterfly throttle valve in the EVB can work normally when the engine is in a non-working state is a technical problem to be solved urgently by those skilled in the art.

Contents of the invention

The purpose of the present invention is to provide a test system for obtaining the performance of the EVB system and its control strategy. The control strategy can realize whether the butterfly throttle valve can work normally when the engine is not started.

In order to solve the above technical problems, the present invention provides a control strategy for obtaining EVB system performance, the specific control strategy is:

S1. The vehicle ECU is powered on, and the EVB system control switch is turned on without turning on the engine;

S2. Control the butterfly throttle valve in the EVB system to be in an open working state or a closed working state, and detect a spool action signal of the butterfly throttle valve;

S3. According to the switch signal of the spool, it is judged whether the spool satisfies the condition of normal opening or closing, if the condition is met, then execute step S32; otherwise, execute step S31;

S31. Sending a control command to normally open or close the spool;

S32. Sending a control command for abnormal opening or abnormal closing of the spool.

Preferably, after the ECU is powered on in step S1, the following judgments are automatically performed at first:

S11. Judging the time difference from the time when the EVB system control switch was turned on last time without turning on the engine, if the time difference is less than or equal to the preset value, then execute step S14; otherwise, execute step S12;

S12. The ECU sends a control command to turn on the control switch of the EVB system;

S14. The ECU issues a control instruction that does not need to be detected.

Preferably, it also includes a first display component. In step S11, when the ECU executes step S14, it also executes the following steps:

S20. Sending a control command to put the first display component in the first state;

In step S11, when performing step S12, also perform the following steps:

S21. Send a control command to put the first display component in the second state.

Preferably, after performing step S12, before entering step S2, the following judgments are also made:

S13. Determine whether the engine is turned on, and whether the EVB system control switch is turned on; if the engine is not turned on, and the EVB system control switch is turned on, then enter step S2; otherwise, execute step S15;

S15. Prompting an error, and returning to step S13.

Preferably, a second display component is also included, and when step S13 is executed to enter step S2, it is also executed:

S22. Sending a control instruction to put the second display component in the first state;

When executing step S15 in step S13, also execute:

S23. A control instruction for placing the second display component in a second state.

Preferably, an alarm component is also included, and the following steps are also performed after the step S32:

S33. Receive a control command of abnormal opening or closing of the valve core, and send an alarm signal according to the control command.

Preferably, an actuator is also included, the actuator includes an air cylinder and a swing arm, the telescoping end of the air cylinder is connected to the rotating shaft of the butterfly throttle valve through the swing arm, and the air cylinder is located at the first working position and the second working position. In the second working position, the valve core is in the open working state and the closed working state respectively.

Preferably, the acquiring component is an angle sensor, and the angle sensor is arranged on the rotating shaft of the butterfly throttle valve.

The control strategy for obtaining the performance of the EVB system provided by the present invention can measure the opening angle of the butterfly throttle valve in different working states only when the ECU is powered and the engine is not started, so as to realize whether the valve core can work normally Compared with the prior art, which can only know whether the butterfly throttle valve can work normally when the EVB system is used to brake after the engine is started and the vehicle is running, the control strategy provided by the present invention improves the performance of the vehicle. The driving safety guarantees the life safety of the driver.

At the same time, it also reduces the impact on the driver and the engine caused by the sudden drop in engine power when the butterfly throttle valve in the EVB system brakes while driving, improves the comfort of inspection, and at the same time plays the role of early detection, rectification and prevention.

In addition, the present invention also provides a test system for obtaining the performance of the EVB system, which includes a butterfly throttle valve and an actuator that drives the butterfly throttle valve to open or close, and includes an obtaining component for obtaining the performance of the EVB system. The spool action signal of the butterfly throttle valve, and the vehicle ECU is provided with a judging unit that receives the spool action signal and calculates the spool opening of the butterfly throttle valve.

Preferably, the acquiring component is an angle sensor, and the angle sensor is arranged on the rotating shaft of the butterfly throttle valve.

Since the above control strategy is implemented on the basis of the test system, the test system provided by the present invention also has the beneficial effect of the above control strategy.

Description of drawings

Fig. 1 is the flow chart of the control strategy that is used to obtain EVB system performance in an embodiment of the present invention;

Fig. 2 is the flow chart of the control strategy that is used to obtain EVB system performance in a kind of preferred embodiment of the present invention;

Fig. 3 is a structural schematic diagram of the butterfly throttle valve of the EVB system in a fully open state in an embodiment of the present invention;

Fig. 4 is a side view of the test system shown in Fig. 3;

Fig. 5 is a schematic structural view of the butterfly throttle valve of the testing system in a fully closed state in an embodiment of the present invention;

FIG. 6 is a side view of the testing system shown in FIG. 5 .

Wherein, the one-to-one correspondence between reference numerals and component names in Fig. 3 to Fig. 6 is as follows:

1 exhaust pipe, 2 gas cylinder, 3 piston rod, 4 swing arm, 5 angle sensor, 6 spool, 7 rotating shaft.

Detailed ways

The core of the present invention is to provide a test system for obtaining the performance of the EVB system and its control strategy. The control strategy can realize whether the butterfly throttle valve can work normally when the engine is not started.

In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below in conjunction with the system, control strategy, drawings and specific embodiments.

Please refer to FIG. 1 , which is a flow chart of a control strategy for obtaining EVB system performance in an embodiment of the present invention.

The invention provides a test system for obtaining the performance of the EVB system, which includes an obtaining part for obtaining the action signal of the valve core 6 of the butterfly throttle valve in the EVB. The obtaining part can be an angle detection switch to detect the The rotation angle of the sheet rotating shaft 7 can also be other types of detection switches, and the vehicle ECU is provided with a judging unit, which receives the action signal of the spool 6 and calculates the opening degree of the spool 6 of the butterfly throttle valve. The operator can According to the calculated opening degree of the spool 6, it is judged whether the butterfly throttle valve is in the normal open or normal closed working state. Generally, the butterfly throttle valve has two working states: the open working state and the closed working state. The working state requires the butterfly throttle valve to be fully opened, and the closed working state requires the butterfly throttle valve to be completely closed. Therefore, the operator can place the butterfly throttle valve in the open working state and closed working state, and observe the calculated results of the ECU respectively. Whether the angle of the spool 6 of the butterfly throttle valve is fully open or fully closed; of course, for special circumstances, when the butterfly throttle valve is in an open state, the spool 6 of the butterfly throttle valve can also be set to open to a certain angle. The specific control strategy is as follows:

S1. The vehicle ECU is powered on, and the EVB system control switch is turned on without turning on the engine;

S2. Control the butterfly throttle valve in the EVB system to be in the open working state or closed working state, and detect the spool 6 action signal of the butterfly throttle valve; generally, the butterfly throttle valve is arranged on the engine On the exhaust pipe 1, for a multi-cylinder engine, the butterfly throttle valve is arranged on the exhaust main pipe;

S3. Judging whether the valve core 6 satisfies the condition of normal opening or closing according to the switch signal of the valve core 6, if the condition is satisfied, then execute step S32; otherwise, execute step S31;

S31. Sending a control command to normally open or close the spool 6;

S32. Sending a control command for abnormal opening or abnormal closing of the spool 6.

The control strategy provided by the present invention can measure the opening angle of the butterfly throttle valve in different working states only when the ECU is powered and the engine does not start, so as to realize the purpose of judging whether the valve core 6 can work normally, which is different from the existing In the technology, it is only possible to know whether the butterfly throttle valve can work normally when the EVB system is used for braking after the engine is started and the vehicle is running. the life safety of the driver.

At the same time, it also reduces the impact on the driver and the engine caused by the sudden drop in engine power when the butterfly throttle valve in the EVB system brakes while driving, improves the comfort of inspection, and at the same time plays the role of early detection, rectification and prevention.

Please refer to FIG. 2 , which is a flow chart of a control strategy for obtaining EVB system performance in a preferred embodiment of the present invention.

In a preferred embodiment, after the ECU is powered on in the above step S1, before the EVB system control switch is turned on, the following judgments are automatically performed:

S11. Judging the time difference from the time when the EVB system control switch was turned on last time without turning on the engine, if the time difference is less than or equal to the preset value, then execute step S14; otherwise, execute step S12;

S12. The ECU sends a control command to turn on the control switch of the EVB system;

S14. The ECU issues a control instruction that does not need to be detected.

The detection time difference can be reasonably set by the operator according to the needs of the system, so as to avoid the phenomenon that the detection is performed as soon as the ECU system is turned on, which can improve the working efficiency of the vehicle operation.

The above-mentioned ECU control command can be displayed through the set display part, so that the operator can know whether to perform detection according to the display of the display part, for example, the first display part is set, and the first display part is also included. In step S11, when the While executing step S14, the ECU also sends out a control command to place the first display component in the first state; while executing step S12, it also sends out a control command to place the first display component in the second state; A display component is an indicator light as an example. When the ECU judges that the time difference is less than or equal to the preset value, the indicator light receives a control command from the ECU that does not need to be detected. At this time, the indicator light is in the off state; The control command of the system control switch, the indicator light is on. The specific steps refer to the following:

In the above step S11, when the ECU executes the step S14, the following steps are also executed:

S20, sending out a control command that the indicator light is off;

In step S11, when performing step S12, also perform the following steps:

S21. Sending a control command to light up the indicator light.

Certainly, the display components are not limited to the above-mentioned indicator lights, and may also be other visual components or sound components, for example, indicator lights of various colors respectively display different control commands, or components such as alarm bells.

Further, after step S12 is executed, before entering step S2, the following judgment is also made:

S13. Determine whether the engine is turned on, and whether the EVB system control switch is turned on; if the engine is not turned on, the EVB system control switch is turned on, then enter step S2; otherwise, prompt an error, and re-execute step S12.

In this way, when the system detects a failure, it is beneficial to find the cause of the system failure.

Meanwhile, the system may further include a second display part, and also include a second display part. When step S13 is executed and step S2 is executed, the ECU also issues a control to put the second display part in the first state. Instruction; when step S15 is executed, the ECU also issues a control instruction to put the second display component in the second state. Similarly, the second display component is similar to the first display component, and can be a visual prompting device such as an indicator light, or an auditory prompting device such as an alarm bell. Specific steps are as follows:

When executing in step S13 and entering step S2, also execute:

S2. Sending a control instruction to put the second display component in the first state;

When executing step S15 in step S13, also execute:

S23. A control instruction for placing the second display component in a second state.

Taking the second display part as an indicator light as an example, when the engine is not turned on, the EVB system control switch is turned on, and the ECU sends a control command that the indicator light is in a light-off state; when the engine is not turned on and the EVB system controls When the switch is turned on, one of the two does not meet the conditions; the ECU sends a control command that the indicator light is on.

In each of the above-mentioned embodiments, the test system also includes an alarm component, and the following steps are also performed after the step S32:

S33. Receive the control command of abnormal opening or closing of the spool, and send an alarm signal according to the control command; in this way, when the butterfly throttle valve cannot be opened or closed normally, the alarm component can remind the vehicle to operate Personnel maintain the EVB system in time.

Please refer to Fig. 3 to Fig. 6, Fig. 3 is a schematic diagram of the structure of the butterfly throttle valve in a fully open state in the test system used to obtain the performance of the EVB system in an embodiment of the present invention; Fig. 4 is the test system shown in Fig. 3 5 is a schematic structural view of the butterfly throttle valve in a fully closed state of the test system in an embodiment of the present invention; FIG. 6 is a side view of the test system shown in FIG. 5 .

The EVB system in each of the above embodiments can also include an actuator, the actuator includes an air cylinder 2 and a swing arm 4, the telescopic end of the air cylinder 2 is connected to the rotating shaft 7 of the butterfly throttle valve through the swing arm 4, and the air cylinder 2 is located at the first working position and the second working position, the spool 6 is in the open working state and the closing working state respectively. Taking FIG. 3 as an example, the piston rod 3 connected to the piston in the gas cylinder 2 is connected to the swing arm 4 .

The power source of the air cylinder 2 can be a compressed air package installed on the vehicle; of course, the actuator of the butterfly throttle valve in the EVB system includes but is not limited to the above description.

In the above-mentioned embodiments, the acquisition component can be the angle sensor 5, which is arranged on the rotating shaft 7 of the butterfly throttle valve; this arrangement method is relatively simple, and does not need to occupy too much space, and the measurement is relatively reliable.

The test system and its control strategy for obtaining the performance of the EVB system provided by the present invention have been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (10)

1. for obtaining a control strategy for EVB systematic function, it is characterized in that, concrete control strategy is:

S1, vehicle ECU power on, and connect EVB system control switch not opening under engine condition;

S2, control in described EVB system butterfly throttle valve in opening working state or closing working state, and detect the spool actuating signal of described butterfly throttle valve;

S3, according to described switching spool signal, judge that whether described spool meets the condition of normally opening or closing, if satisfied condition, performs step S32; Otherwise, execution step S31;

S31, send the control command that spool is normally opened or closed;

S32, send spool unauthorised opening or improper control command of closing.

2. control strategy as claimed in claim 1, is characterized in that, in step S1, after described ECU powers on, first automatically makes the following judgment:

S11, judgement are last to be connected the current time difference of EVB system control switch distance not opening under engine condition, if the described time difference is less than or equal to predefined value, performs step S14; Otherwise, and perform step S12;

S12, ECU send the control command of connecting EVB system control switch;

S14, ECU send without the control command detecting.

3. control strategy as claimed in claim 2, is characterized in that, also comprises the first display unit, in step S11, in described ECU execution step S14, also carries out following steps:

S20, send the control command in the first state by described the first display unit;

In step S11, in execution step S12, also carry out following steps:

S21, send the control command in the second state by described the first display unit.

4. control strategy as claimed in claim 2, is characterized in that, after execution step S12, before entering step S2, also makes the following judgment:

S13, judge whether motor is opened, whether EVB system control switch open; If described motor is not opened, described EVB system control switch is opened, and enters step S2; Otherwise, execution step S15;

S15, prompting make mistakes, and return to execution step S13.

5. control strategy as claimed in claim 4, is characterized in that, also comprises the second display unit, when execution in step S13 enters step S2, also carries out:

S22, send the control command in the first state by described the second display unit;

When performing step S15 in step S13, also carry out:

S23, the control command by described the second display unit in the second state.

6. control strategy as claimed in claim 1, is characterized in that, also comprises warning piece, also carries out following steps after described step S32:

S33, receive described spool unauthorised opening or improper control command of closing, and according to described control command and send alarm signal.

7. control strategy as claimed in claim 1, it is characterized in that, also comprise actuator, described actuator comprises inflator and swing arm, the telescopic end of described inflator connects the rotating shaft of described butterfly throttle valve by described swing arm, when described inflator is positioned at the first working position and the second working position, described spool is respectively in opening working state and closing working state.

8. the control strategy as described in claim 1 to 7 any one, is characterized in that, described in to obtain parts be angle transducer, described angle transducer is located at the rotating shaft of described butterfly throttle valve.

9. one kind for obtaining the test system of EVB systematic function, the actuator that comprises butterfly throttle valve and drive described butterfly throttle valve to open or close, it is characterized in that, comprise and obtain parts, for obtaining the spool actuating signal of EVB system butterfly throttle valve, and in vehicle ECU, be provided with judging unit, described judging unit receives described spool actuating signal and calculates the spool aperture of described butterfly throttle valve.

10. test system as claimed in claim 9, is characterized in that, described in to obtain parts be angle transducer, described angle transducer is located at the rotating shaft of described butterfly throttle valve.

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