阅读说明：本技术 一种水陆两栖车用发动机多功率控制方法及系统 (Multi-power control method and system for engine of amphibious vehicle ) 是由 胡伟 吴卫星 周忠胜 张强 况文宇 于 2021-09-15 设计创作，主要内容包括：本发明属于发动机控制领域,并具体公开了一种水陆两栖车用发动机多功率控制方法及系统。所述方法包括动力分配器选择“水上”或“陆地”档位,发动机ECU导入动力分配器陆地挡结合状态信号,若为“Y”,发动机ECU控制发动机输出扭矩,做低功率输出,若为“N”,发动机ECU控制发动机输出扭矩,做高功率输出,并判断是否进入水上短时极限工作模式。所述系统包括发动机、动力分配器、变速箱、桨叶以及控制系统,控制系统包括发动机ECU和整车控制器VCU。本发明能满足陆地行驶低功率、水上高速滑行高功率、水上过渡起滑航行极限功率的功率输出,有效的减轻了车辆整备重量、提升了载重量和最高航速等性能、提高了整车陆地行驶经济性。(The invention belongs to the field of engine control, and particularly discloses a multi-power control method and system for an amphibious vehicle engine. The method comprises the steps that a power divider selects a water gear or a land gear, an engine ECU (electronic control unit) introduces a land gear combination state signal of the power divider, if the gear is Y, the engine ECU controls the output torque of the engine and performs low-power output, if the gear is N, the engine ECU controls the output torque of the engine and performs high-power output, and whether the power divider enters a water short-time limit working mode or not is judged. The system comprises an engine, a power distributor, a gearbox, blades and a control system, wherein the control system comprises an engine ECU and a vehicle control unit VCU. The invention can meet the power output of low power during land running, high power during high-speed sliding on water and limit power during transition sliding starting on water, effectively reduces the vehicle servicing weight, improves the performances of load capacity, maximum navigational speed and the like, and improves the land running economy of the whole vehicle.)

1. A multi-power control method for an amphibious vehicle engine is characterized by comprising the following steps:

step one, the power distributor selects a water gear or a land gear, the engine ECU introduces a land gear combination state signal of the power distributor, if the signal is Y, the step two is carried out, and if the signal is N, the step three is carried out;

step two, the engine ECU judges that the vehicle enters a land driving state or a landing driving state, and the engine ECU controls the output torque of the engine to output low power;

step three, the engine ECU judges that the vehicle enters the water navigation mode, the engine ECU controls the output torque of the engine to output high power, and the step four is carried out;

and step four, judging whether the vehicle enters a water short-time limit working mode or not by the engine ECU, if so, controlling the output torque of the engine by the engine ECU, outputting limit power, continuing to return to the step one after a specified time, and if not, returning to the step one.

2. The multi-power control method for the engine of the amphibious vehicle as claimed in claim 1, wherein in step four, the engine ECU receives the following signals and determines whether the vehicle enters the water short-time limit working mode according to the signals:

(1) whether the limit power output usage time interval Δ t is greater than 2 minutes;

(2) whether the opening k of the throttle valve of the engine is more than or equal to 98 percent;

(3) whether the water navigation acceleration is less than or equal to 0.5m/s²；

(4) Whether the water sailing speed is less than or equal to 30km/h or not;

if the conditions are all yes, the vehicle is judged to enter the water short-time limit working mode.

3. The multi-power control method for the engine of the amphibious vehicle according to claim 1, wherein in step four, the designated time is in a range of 30-120 seconds.

4. An amphibious vehicle engine multi-power control system for implementing a method according to any of claims 1-3, characterised by comprising an engine (1), a power splitter (2), a gearbox (3), blades (4) and a control system, wherein,

the power distributor (2) is used for selecting a water gear or a land gear;

the power divider (2) is positioned between the engine (1) and the gearbox (3), and the power divider (2) is used for outputting the power with different powers output by the engine (1) to the paddle (4) and the gearbox (3) respectively;

the control system comprises an engine ECU and a vehicle control unit VCU, wherein the engine ECU is in communication connection with the vehicle control unit VCU, and the engine ECU is used for receiving and feeding back information of the vehicle control unit VCU and judging that the vehicle enters a land driving state, a landing driving state or an overwater short-time limit working mode according to the acquired information.

5. The multi-power control system of the engine for the amphibious vehicle as claimed in claim 4, wherein the output end of the gearbox (3) is in transmission connection with a transfer case, the transfer case is in transmission connection with the front axle assembly through a front axle transmission shaft, and the transfer case is in transmission connection with the rear axle transmission assembly through a rear axle transmission shaft.

6. An amphibious vehicle engine multi-power control system according to claim 4, characterised in that the engine (1) is provided with one or more and the blades (4) are provided with one or more.

7. An amphibious vehicle engine multi-power control system as claimed in claim 4, characterised in that the short term limit mode of operation on water is entered whilst meeting the following requirements:

(1) whether the limit power output usage time interval Δ t is greater than 2 minutes;

(2) whether the opening k of the throttle valve of the engine is more than or equal to 98 percent;

(3) whether the acceleration of water navigation is smallIs equal to or greater than 0.5m/s²；

(4) Whether the water sailing speed is less than or equal to 30 km/h.

8. An amphibious vehicle engine multi-power control system according to any one of claims 4 to 7, characterised in that the operating time for each said marine short term limit mode of operation is in the range 30 to 120 seconds.

Technical Field

The invention belongs to the field of engine power control, and particularly relates to a multi-power control method and system for an amphibious vehicle engine.

Background

The high-speed amphibious vehicle has the capability of rapidly driving on land and water, and has different power output requirements on the engine under different working conditions. When the vehicle runs on the land, the power requirement of the vehicle is the same as that of a common vehicle, and the power requirement can be met only by small power. When the vehicle is travelling on water at a high speed, the power demand is much greater than for land travel, and in practical applications, the resistance of the vehicle peaks shortly before the vehicle reaches the maximum speed, and then gradually decreases and then continues to increase as the speed increases, as shown in fig. 4.

One of the commonly used methods for controlling the power of the engine at present is to adopt a single-power control method, and adopt the same power control on land and water. The vehicle needs to select a high-power engine according to peak resistance and corresponding speed when navigating on water, and the input power and torque of a corresponding gearbox, a corresponding transmission shaft and the like are correspondingly increased in order to match the high-power engine in a transmission system under a land driving working condition, so that the size and the weight of the transmission system are larger. The arrangement of a transmission system is difficult, and the whole vehicle has large service quality, so that the land running and water sailing performance of the vehicle are adversely affected, vicious circle is formed, the cost of the amphibious vehicle is increased, and the fuel economy is poor.

Chinese patent CN107914775A discloses a chassis for dual-power special-purpose vehicle and a control method thereof, and the control method mainly provides a chassis constitution for dual-power special-purpose vehicle and a dual-power control method thereof. The engine double-power control logic judges whether the engine power enters a low-power or high-power mode according to whether the vehicle speed is 0. The power judgment mode related to the patent is greatly different from the power selection of an amphibious vehicle. The selection of the engine power of the amphibious vehicle is influenced by the working conditions of water navigation and land navigation, and is also influenced by a plurality of factors such as the opening of a throttle valve, navigation acceleration, navigation speed, acceleration time and the like, the control strategy is completely different from the patent, and the application scene is also completely different.

When the amphibious vehicle runs on the land, the power requirement can be met only by needing smaller power. When the vehicle sails on water at a high speed, the power demand is high, and meanwhile, due to the fact that the driving conditions are changed and are influenced by uncontrollable factors such as water flow direction, wind direction, temperature, altitude, emergency rescue overload, cabin water seepage and the like, the power of an engine is often insufficient to overcome the resistance peak value of the vehicle before the vehicle reaches the highest sailing speed gliding state, and the vehicle cannot reach a high and economical sailing speed.

Therefore, designing an engine control method and system capable of meeting various power outputs such as low power during land running, high power during high-speed hydroplaning on water, limited power during transition hydroplaning on water and the like is a problem to be solved by those skilled in the art.

Disclosure of Invention

Aiming at the defects or improvement requirements in the prior art, the invention provides a multi-power control method and a system for an engine of an amphibious vehicle, wherein the method and the system for controlling the engine of the amphibious vehicle are correspondingly designed by combining the characteristics of the amphibious vehicle and the power control characteristics of the engine, and can meet various power outputs such as low land running power, high water high-speed planing power, limited water transitional skidding and sailing power, and the like. The inherent characteristic that the engine can run in the limit working condition for a short time is utilized to control the short-time high-power output of the engine in the limit working mode, and the maneuverability, the endurance mileage and the viability of the vehicle in the severe environment are enhanced.

To achieve the above object, according to one aspect of the present invention, there is provided a multi-power control method for an amphibious vehicle engine, comprising the steps of:

step one, the power distributor selects a water gear or a land gear, the engine ECU introduces a land gear combination state signal of the power distributor, if the signal is Y, the step two is carried out, and if the signal is N, the step three is carried out;

step two, the engine ECU judges that the vehicle enters a land driving state or a landing driving state, and the engine ECU controls the output torque of the engine to output low power;

step three, the engine ECU judges that the vehicle enters the water navigation mode, the engine ECU controls the output torque of the engine to output high power, and the step four is carried out;

and step four, judging whether the vehicle enters a water short-time limit working mode or not by the engine ECU, if so, controlling the output torque of the engine by the engine ECU, outputting limit power, continuing to return to the step one after a specified time, and if not, returning to the step one.

Preferably, in step four, the engine ECU receives the following signals and determines whether the vehicle enters the above-water short-time limit operating mode according to the signals:

(1) whether the limit power output usage time interval Δ t is greater than 2 minutes;

(2) whether the opening k of the throttle valve of the engine is more than or equal to 98 percent;

(3) whether the water navigation acceleration is less than or equal to 0.5m/s²；

(4) Whether the water sailing speed is less than or equal to 30km/h or not;

if the conditions are all yes, the vehicle is judged to enter the water short-time limit working mode.

More preferably, in the fourth step, the specified time is 30 to 120 seconds.

According to another aspect of the invention, there is also provided an amphibious vehicle engine multi-power control system for implementing the method described above, comprising an engine, a power splitter, a gearbox, paddles and a control system, wherein,

the power distributor is used for selecting a water gear or a land gear;

the power divider is positioned between the engine and the gearbox and is used for respectively outputting power with different powers output by the engine to the paddle (or the jet pump) and the gearbox;

the control system comprises an engine ECU and a vehicle control unit VCU, wherein the engine ECU is in communication connection with the vehicle control unit VCU, and the engine ECU is used for receiving and feeding back information of the vehicle control unit VCU and judging that the vehicle enters a land driving state, a landing driving state or an overwater short-time limit working mode according to the acquired information.

Preferably, the output end of the gearbox is in transmission connection with a land transfer case, the transfer case is in transmission connection with the front axle assembly through a front axle transmission shaft, and meanwhile, the transfer case is in transmission connection with the rear axle transmission assembly through a rear axle transmission shaft.

Further preferably, the engine is provided with one or more than one, and the paddle (jet pump) is provided with one or more than one.

As a further preference, entering the above-water short-time limit operating mode simultaneously satisfies the following requirements:

(1) whether the limit power output usage time interval Δ t is greater than 2 minutes;

(2) whether the opening k of the throttle valve of the engine is more than or equal to 98 percent;

(3) whether the water navigation acceleration is less than or equal to 0.5m/s²；

(4) Whether the water sailing speed is less than or equal to 30 km/h.

More preferably, the operating time of each on-water short-time limit operating mode is in a range of 30-120 seconds.

Generally, compared with the prior art, the above technical solution conceived by the present invention mainly has the following technical advantages:

1. the control method of the invention can meet various power outputs of low power for land running, high power for water high-speed sliding, limited power for water transition sliding and sailing, etc., effectively reduce the vehicle weight, improve the performances of load capacity, maximum sailing speed, etc., and improve the land running economy of the whole vehicle. The inherent characteristic that the engine can run in the limit working condition for a short time is utilized to control the short-time high-power output of the engine in the limit working mode, and the maneuverability, the endurance mileage and the viability of the vehicle in the severe environment are enhanced.

2. The invention overcomes the problems of large volume, heavy weight, poor economy, low sailing performance under severe working conditions and the like in the existing scheme, and provides the engine control method and the engine control system which can meet various power outputs such as low power during land driving, high power during high-speed sailing on water, limited power during transition sailing on water and the like.

3. The invention outputs different torques and powers in different modes by calculating and judging the torques and power outputs of the engine gearbox in different navigation modes, thereby improving the power output efficiency of the system.

Drawings

FIG. 1 is a flow chart of a multi-power control method for an amphibious vehicle engine according to an embodiment of the invention;

FIG. 2 is a signal transmission diagram of an overwater short-time limit working mode in a multi-power control method of an amphibious vehicle engine according to an embodiment of the invention;

FIG. 3 is a schematic diagram of a power distribution structure of a multi-power control system of an amphibious vehicle engine according to an embodiment of the invention;

FIG. 4 is a graph of sailing speed versus sailing resistance for a prior art high speed amphibious vehicle sailing on water to a maximum sailing speed;

FIG. 5 shows a graph of engine power control in a multi-power control system of an amphibious vehicle engine according to an embodiment of the present invention.

In all the figures, the same reference numerals denote the same features, in particular: 1-engine, 2-power distributor, 3-gear box, 4-blade (or jet pump).

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.

As shown in FIGS. 1 and 3, the multi-power control method for the engine of the amphibious vehicle mainly uses a system comprising the engine 1, a power divider 2, a gearbox 3, a blade 4 (or a jet pump) and the like, and further comprises an engine ECU, a vehicle control unit VCU and other control systems in the implementation process. The power divider 2 is located between the engine 1 and the gearbox 3, and is used for outputting power with different powers to the paddle (or the jet pump) and the gearbox respectively. The gearbox drives the land drive system and the paddles (or jet pumps) drive the marine drive system.

Through the system, the control method comprises the following steps:

step one, the power divider selects a water gear or a land gear, the engine ECU introduces a power divider land gear combination state signal, if the power divider land gear combination state signal is Y, the step two is entered, and if the power divider land gear combination state signal is N, the step three is entered.

Step two, the engine ECU judges that the vehicle enters a land driving state or a landing driving state, and the engine ECU controls the output torque of the engine to output low power;

step three, the engine ECU judges that the vehicle enters the water navigation mode, the engine ECU controls the output torque of the engine to output high power, and the step four is carried out;

and step four, judging whether the vehicle enters a water short-time limit working mode or not by the engine ECU, if so, controlling the engine to output torque by the engine ECU, outputting limit power, continuing for a certain time value in 30-120 seconds, and returning to the step one, otherwise, returning to the step one.

In this step, the engine ECU receives the following signals and determines therefrom whether the vehicle enters the above-water short-time limit operating mode:

(1) whether the limit power output usage time interval Δ t is greater than 2 minutes;

(2) whether the opening k of the throttle valve of the engine is more than or equal to 98 percent;

(3) whether the water navigation acceleration is less than or equal to 0.5m/s²；

(4) Whether the water sailing speed is less than or equal to 30km/h or not;

if the conditions are all yes, the vehicle is judged to enter the water short-time limit working mode.

The control method of the invention realizes three power requirements of low power for land running, high power for long-time sailing on water, extreme power for water skidding and sailing and the like. Meanwhile, as an embodiment of the invention, in the method, two power requirements of low power for land running and high power for water sailing are realized by a cutting control method. Namely, the interception locking is carried out on the step three and the step four by a cutting method, and the step one is directly returned.

The control method of the invention meets the requirements of different running working conditions of the vehicle by controlling different output powers of the engine, effectively reduces the vehicle servicing weight, improves the performances of load capacity, maximum navigational speed and the like, and improves the land running economy of the whole vehicle. The inherent characteristic that the engine can run in the limit working condition for a short time is utilized to control the short-time high-power output of the engine in the limit working mode, and the maneuverability, the endurance mileage and the viability of the vehicle in the severe environment are enhanced.

According to another aspect of the invention, there is also provided an amphibious vehicle engine multi-power control system comprising an engine 1, a power splitter 2, a gearbox 3, blades 4 and a control system, wherein the power splitter 2 is used to select either "marine" or "terrestrial" gears; the power divider 2 is positioned between the engine 1 and the gearbox 3, and the power divider 2 is used for outputting power with different powers output by the engine 1 to the blades 4 and the gearbox 3 respectively; the power divider 2 is located between the engine 1 and the gearbox 3, and is used for outputting power with different powers to the paddle (or the jet pump) and the gearbox respectively. The gearbox is used to drive the land drive system and the paddles (or jet pumps) are used to drive the marine drive system. The control system comprises an engine ECU and a vehicle control unit VCU, wherein the engine ECU is in communication connection with the vehicle control unit VCU, and the engine ECU is used for deriving information of the vehicle control unit VCU and judging that the vehicle enters a land driving state, a landing driving state or an overwater short-time limit working mode according to the acquired information.

More specifically, the power divider 2 selects an "on-water" or "land" gear, the engine ECU introduces a power divider land gear combination state signal, and when the acquired signal is the "land" gear, the engine ECU determines that the vehicle enters a land driving or landing driving state, and controls the engine output torque to perform low-power output. When the acquired signal is an overwater gear, the engine ECU judges that the vehicle enters an overwater sailing mode, and the engine ECU controls the output torque of the engine to output high power. In the water navigation mode, the engine ECU judges whether the vehicle enters a water short-time limit working mode, if so, the engine ECU controls the output torque of the engine to output limit power, and after the output torque lasts for a certain numerical value of 30-120 seconds, the engine ECU can reintroduce a land gear combination state signal of the power divider.

In a preferred embodiment of the invention, the output end of the gearbox 3 is in driving connection with a transfer case, which is in driving connection with the front axle assembly through a front axle drive shaft, and at the same time, the transfer case is in driving connection with the rear axle drive assembly through a rear axle drive shaft.

In another preferred embodiment of the present invention, the engine 1 is provided with one or more than one, and the blades 4 are provided with one or more than one.

In one embodiment of the invention, the land driving system comprises an engine, a power takeoff with a shaft, a transmission shaft of a gearbox and a rear axle, wherein the output end of the engine 1 is connected with the input end of the gearbox, the output end of the gearbox is connected with the rear axle through the transmission shaft, the power takeoff with the shaft is positioned between the engine and the gearbox, the input end is connected with the engine, and the output end is connected with the input end of the upper-mounted operating system.

The control system comprises an upper working switch, an engine ECU and a vehicle control unit VCU. The upper working switch is electrically connected with the engine ECU and sends working state signals to the VCU of the vehicle control unit. And the VCU of the whole vehicle controller is in signal connection with the ECU of the engine.

The control method of the system comprises the following steps:

step I: the power divider selects a water gear or a land gear, the engine ECU introduces a land gear combination state signal of the power divider, if the signal is Y, the step II is carried out, and if the signal is N, the step III is carried out;

step II: the engine ECU judges that the vehicle enters a land driving state or a landing driving state, and controls the output torque of the engine to output low power;

step III: the engine ECU judges that the vehicle enters a water sailing mode, and controls the output torque of the engine to output high power; entering a step IV;

step IV: the engine ECU receives and determines the following signals:

(1) whether the limiting power mode usage time interval Δ t is greater than 2 minutes;

(2) whether the throttle opening k is more than or equal to 98 percent;

(3) whether the water navigation acceleration is less than or equal to 0.5m/s²；

(4) The water sailing speed is less than or equal to 30 km/h;

and (5) if the conditions are Y, entering the step V, otherwise, returning to the step I.

Step V: and (4) judging that the vehicle enters a water short-time limit working mode, controlling the output torque of the engine by the engine ECU, outputting limit power, and returning to the step I, wherein the duration t is a numerical value in 30-120 seconds.

Wherein the engine ECU receives the special case value signal not limited to the one described in step IV.

It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.