CN108638983B - Electric motor coach double-source power-assisted steering system and control method - Google Patents
Electric motor coach double-source power-assisted steering system and control method Download PDFInfo
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- CN108638983B CN108638983B CN201810270935.XA CN201810270935A CN108638983B CN 108638983 B CN108638983 B CN 108638983B CN 201810270935 A CN201810270935 A CN 201810270935A CN 108638983 B CN108638983 B CN 108638983B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/06—Power-assisted or power-driven steering fluid, i.e. using a pressurised fluid for most or all the force required for steering a vehicle
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D6/00—Arrangements for automatically controlling steering depending on driving conditions sensed and responded to, e.g. control circuits
Abstract
The invention discloses a double-source power-assisted steering system of an electric motor coach and a control method, and aims to solve the problem of steering safety of the electric motor coach. Under the normal condition of the vehicle, a high-voltage power supply of the vehicle is preferentially used for supplying power to the steering controller by setting a power supply conversion device and a specific control method, so that the continuous normal work of a steering system is ensured; meanwhile, under the condition that the high-voltage power supply is abnormally powered off, the direct-current converter is seamlessly switched in, and the low-voltage power supply can be used for supplying power to the steering controller so as to continuously maintain the power-assisted steering function, so that the steering reliability in the running process of the vehicle is ensured, and the potential safety hazard caused by sudden failure of the steering power after the high-voltage abnormal power off is avoided.
Description
Technical Field
The invention relates to the field of design and manufacture of electric motor coaches, in particular to a double-source power-assisted steering system of an electric motor coach and a control method.
Background
Under normal conditions, an electric steering controller of the electric motor coach adopts a whole coach high-voltage power supply to supply power so as to drive a whole coach electric power-assisted steering oil pump motor to continuously and normally work. However, when the high-voltage power supply of the vehicle is abnormally disabled due to non-human factors, the electric power steering system stops working due to high-voltage power failure of the electric power steering controller, and the power steering of the vehicle is immediately lost, so that the direction rebounds, and a danger occurs. Especially when the vehicle is in a high speed steering state, the sudden loss of the power assisting function can seriously affect the driving safety. In order to solve the problem, the invention provides a double-source power-assisted steering system of an electric motor coach and an effective control method, which can preferentially use a high-voltage power supply to supply power under a normal condition and can realize seamless switching of low-voltage power supply power under the condition of abnormal power failure of the high-voltage power supply so as to ensure that the power-assisted steering system continuously and effectively works.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a double-source power-assisted steering system and a control method of an electric motor coach, and aims to solve the problem of steering safety of the electric motor coach. Under the normal condition of the vehicle, a high-voltage power supply of the vehicle is preferentially used for supplying power to the steering controller by setting a power supply conversion device and a specific control method, so that the continuous normal work of a steering system is ensured; meanwhile, under the condition that the high-voltage power supply is abnormally powered off, the direct-current converter is seamlessly switched in, and the low-voltage power supply can be used for supplying power to the steering controller so as to continuously maintain the power-assisted steering function, so that the steering reliability in the running process of the vehicle is ensured, and the potential safety hazard caused by sudden failure of the steering power after the high-voltage abnormal power off is avoided.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a double-source power-assisted steering system of an electric motor coach comprises a high-voltage power supply, a high-voltage switch, a first one-way diode, a steering controller, a power-assisted steering oil pump motor, a low-voltage power supply, a direct-current converter, a second one-way diode and a vehicle controller;
the high-voltage power supply is sequentially connected with the high-voltage switch, the first one-way diode and the input end of the steering controller and provides high-voltage power supply input for the steering controller;
the low-voltage power supply is sequentially connected with the direct-current converter, the second one-way diode and the input end of the steering controller and provides the other path of power supply input for the steering controller;
the output end of the steering controller is connected with the power-assisted steering oil pump motor and is used for driving the power-assisted steering oil pump motor to work;
the vehicle controller is connected with the high-voltage switch, the direct-current converter and the steering controller, is used for detecting the voltage of the high-voltage power supply, the input voltage of the steering controller and the output voltage of the direct-current converter in real time, and is used for controlling the working states of the direct-current converter and the steering controller.
Further, the high-voltage power supply is a direct-current power supply and is used for providing energy supply for the electric motor coach, and the high-voltage power supply comprises but is not limited to a power battery, a super capacitor and a fuel cell system.
Further, the first unidirectional diode is used for enabling the electric energy output from the high-voltage power supply to be transmitted to the rear-end load in a unidirectional mode and preventing the output electric energy of the direct-current converter from flowing backwards.
Further, the second unidirectional diode is used for enabling the electric energy output from the direct current converter to be only transmitted to the rear-end load in a unidirectional mode, and preventing the output electric energy of the high-voltage power supply from flowing backwards.
Further, the steering controller is used for converting the input direct current into alternating current and providing the alternating current to the power-assisted steering oil pump motor so as to realize the power-assisted steering of the electric motor coach.
Further, the low-voltage power supply is a low-voltage power supply for the electric motor coach, and comprises but is not limited to a 12V or 24V direct-current power supply.
Further, the dc converter is configured to convert a low-voltage dc of the low-voltage power supply into a high-voltage dc for output, and an output voltage of the dc converter is lower than a voltage of the high-voltage power supply.
Further, the vehicle controller is also connected with a speed sensor and used for detecting vehicle speed signals in real time.
Further, the vehicle controller is also used for judging the vehicle speed when the passenger vehicle has a fault, and controlling the steering controller and the direct current converter to stop working when the vehicle speed is lower than a safety value.
A control method of a double-source power-assisted steering system of an electric motor coach comprises the following steps:
1) after the high-voltage switch is closed, the vehicle controller controls the steering controller and the direct-current converter to work, the steering controller drives the steering power-assisted oil pump motor to realize steering power assistance, and at the moment, because the output voltage of the direct-current converter is lower than the voltage of a high-voltage power supply, the input voltage of the steering controller is provided by the high-voltage power supply;
2) after the high-voltage switch is disconnected due to uncontrollable factors, the input voltage of the steering controller is rapidly reduced, and when the input voltage of the high-voltage switch is lower than the output voltage of the direct-current converter, the direct-current converter outputs current to drive the steering controller to continuously work and maintain the continuous running of a motor of the power-assisted steering pump;
3) and in the disconnection process of the high-voltage switch, the vehicle controller starts to record the working time and judge a vehicle speed signal, and when the vehicle speed signal is lower than the safety set vehicle speed, the vehicle controller controls the steering controller and the direct-current converter to stop working.
Compared with the prior art, the invention has the beneficial effects that:
by applying the technology of the invention, the forward conduction and reverse cut-off action of the one-way diode can be realized under the normal condition of the vehicle, so that the power supply at the input end of the steering controller is only from a high-voltage power supply, and the continuous normal work of a steering system is ensured; meanwhile, the voltage output by the direct current converter is set to be lower than the voltage of the high-voltage power supply through an effective power supply conversion device and a control method, so that the power output of the direct current converter under the normal condition of the high-voltage power supply is blocked. Under the condition of abnormal power failure of a high-voltage power supply, when the input voltage of the steering controller is lower than the output voltage of the direct-current converter, the output voltage of the direct-current converter can realize seamless cut-in, power supply is provided for the steering controller, and the uninterrupted work of the steering controller is ensured, so that the continuous work of a steering power-assisted oil pump motor is maintained, the steering reliability in the running process of a vehicle is ensured, and the potential safety hazard of steering power failure caused by abnormal power failure of the high voltage is avoided.
Meanwhile, after the high-voltage power supply fails, the vehicle controller can record the steering power-assisted maintaining working time and judge a vehicle speed signal, and when the vehicle speed reaches the safe vehicle speed, the vehicle controller and the direct-current converter are controlled to stop working, so that the low-voltage power supply is prevented from feeding.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the application and, together with the description, serve to explain the application and are not intended to limit the application.
FIG. 1 is a schematic structural diagram of a dual-source power-assisted steering system of an electric motor coach.
Wherein, 1, a high-voltage power supply; 2. a high voltage switch; 3. a first unidirectional diode; 4. a steering controller; 5. a steering booster oil pump motor; 6. a second unidirectional diode; 7. a low voltage power supply; 8. a DC converter; 9. a vehicle controller.
Detailed Description
The invention is further described with reference to the following detailed description of embodiments and drawings.
It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As introduced in the background art, in the prior art, when a high-voltage power supply fails abnormally, an electric steering system stops working due to high-voltage power failure of an electric steering controller, power-assisted steering of a vehicle disappears immediately, direction rebounding is caused, and danger occurs.
As shown in fig. 1, a dual-source power-assisted steering system of an electric motor coach comprises a high-voltage power supply 1, a high-voltage switch 2, a first one-way diode 3, a steering controller 4, a power-assisted steering oil pump motor 5, a low-voltage power supply 7, a direct-current converter 8, a second one-way diode 6 and a vehicle controller 9;
the high-voltage power supply 1 is electrically connected with the high-voltage switch 2, the first one-way diode 3 and the input end of the steering controller 4 in sequence through high-voltage wires to provide high-voltage power supply input for the steering controller 4;
the low-voltage power supply 7 is electrically connected with the direct-current converter 8 through a low-voltage lead, and the direct-current converter 8 is electrically connected with the second one-way diode 6 and the input end of the steering controller 4 through a high-voltage lead in sequence to provide another path of power supply input for the steering controller 4;
the output end of the steering controller 4 is electrically connected with the power-assisted steering oil pump motor 5 through a high-voltage lead and is used for driving the power-assisted steering oil pump motor 5 to work;
the high-voltage switch 2 is an on-off control execution device of a high-voltage system of the electric motor coach;
the vehicle controller 9 is in signal connection with the high-voltage switch 2 and the direct-current converter 8 through enable working lines respectively, is in signal connection with the steering controller 4 through control working lines, is used for detecting a high-voltage power supply voltage U1, a steering controller input voltage U2 and a direct-current converter output voltage U3 in real time, and is used for controlling the working states of the direct-current converter 8 and the steering controller 4.
The high-voltage power supply 1 is a direct-current power supply and is used for providing energy supply for the electric motor coach, and the high-voltage power supply 1 comprises but is not limited to a power battery, a super capacitor and a fuel cell system.
The first unidirectional diode 3 is used to enable the electric energy output from the high-voltage power supply 1 to be transmitted to the back-end load only in a unidirectional manner, and to prevent the output electric energy of the dc converter 8 from flowing backward.
The second unidirectional diode 6 is used to enable the electric energy output from the dc converter 8 to be transmitted to the back-end load only in a unidirectional manner, and to prevent the output electric energy of the high-voltage power supply 1 from flowing backward.
The steering controller 4 is configured to convert an input direct current into a three-phase alternating current, and provide the three-phase alternating current to the power steering oil pump motor 5, so as to achieve power steering of the electric motor coach.
The low-voltage power supply 7 is a low-voltage power supply for the electric motor coach, and comprises but is not limited to a 12V or 24V direct-current power supply.
The dc converter 8 is used for converting the low-voltage dc power of the low-voltage power supply 7 into a high-voltage dc power output, and the dc converter output voltage U3 is lower than the high-voltage power supply voltage U1.
The vehicle controller 9 is also connected with a speed sensor and used for detecting a vehicle speed signal V in real time.
The vehicle controller 9 is also used for judging the vehicle speed V when the passenger car has a fault, and controlling the steering controller 4 and the direct current converter 8 to stop working when the vehicle speed V is lower than a safety value V0
A control method of a double-source power-assisted steering system of an electric motor coach comprises the following steps:
1) after the high-voltage switch 2 is closed, the vehicle controller 9 controls the steering controller 4 and the direct-current converter 8 to work, the steering controller 4 drives the power-assisted steering oil pump motor 5 to realize power-assisted steering, and at the moment, because the output voltage U3 of the direct-current converter is lower than the voltage U1 of the high-voltage power supply, the input voltage U2 of the steering controller is provided by the high-voltage power supply;
2) after the high-voltage switch 2 is disconnected due to uncontrollable factors, the input voltage U2 of the steering controller rapidly drops, and when the input voltage U2 is lower than the output voltage U3 of the direct-current converter, the direct-current converter 8 outputs current to drive the steering controller 4 to continue working and maintain the power-assisted steering pump motor 5 to continue running;
3) when the high-voltage switch 2 is turned off, the vehicle controller 9 enters an abnormal operation mode, starts to record the working time and judges the vehicle speed signal V, and when the vehicle speed signal V is lower than the safety set vehicle speed V0, the vehicle controller 9 controls the steering controller 4 and the direct current converter 8 to stop working.
The opening and closing of the high-voltage switch 2 are controlled by a vehicle controller 9.
In the 1), the dc converter 8 will continue to work, but due to the reverse blocking effect of the first unidirectional diode 3, the dc converter 8 has no actual power output, and the vehicle controller 9 will detect the high-voltage power supply voltage U1, the steering controller input voltage U2 and the vehicle speed signal V in real time.
In 2), when the steering controller input voltage U2 is lower than the dc converter output voltage U3, the reverse blocking effect of the first unidirectional diode 3 is lost, and the dc converter 8 immediately starts power output.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Although the embodiments of the present invention have been described with reference to the accompanying drawings, it is not intended to limit the scope of the present invention, and it should be understood by those skilled in the art that various modifications and variations can be made without inventive efforts by those skilled in the art based on the technical solution of the present invention.
Claims (5)
1. The utility model provides an [ electric ] motor coach double source power assisted steering system which characterized in that: the steering control system comprises a high-voltage power supply, a high-voltage switch, a first one-way diode, a steering controller, a steering booster oil pump motor, a low-voltage power supply, a direct-current converter, a second one-way diode and a vehicle controller;
the high-voltage power supply is sequentially connected with the high-voltage switch, the first one-way diode and the input end of the steering controller and provides high-voltage power supply input for the steering controller;
the high-voltage switch is an on-off control execution device of a high-voltage system of the electric motor coach; the opening and closing of the high-voltage switch are controlled by a vehicle controller;
the low-voltage power supply is sequentially connected with the direct-current converter, the second one-way diode and the input end of the steering controller and provides the other path of power supply input for the steering controller;
the first unidirectional diode is used for enabling the electric energy output from the high-voltage power supply to be transmitted to a rear-end load in a unidirectional mode and preventing the output electric energy of the direct-current converter from flowing backwards; the second unidirectional diode is used for enabling the electric energy output from the direct current converter to be transmitted to a rear end load in a unidirectional mode and preventing the output electric energy of the high-voltage power supply from flowing backwards;
the output end of the steering controller is connected with the power-assisted steering oil pump motor and is used for driving the power-assisted steering oil pump motor to work; the steering controller is used for converting the input direct current into alternating current and providing the alternating current to the power-assisted steering oil pump motor so as to realize the power-assisted steering of the electric motor coach;
the vehicle controller is connected with the high-voltage switch, the direct-current converter and the steering controller, is used for detecting the voltage of the high-voltage power supply, the input voltage of the steering controller and the output voltage of the direct-current converter in real time and is used for controlling the working states of the direct-current converter and the steering controller; the output voltage of the direct current converter is lower than the voltage of a high-voltage power supply;
the vehicle controller is also connected with the speed sensor and is used for detecting a vehicle speed signal in real time; the vehicle controller is also used for judging the speed of the passenger car when the passenger car is in fault, and controlling the steering controller and the direct current converter to stop working when the speed of the passenger car is lower than a safety value;
1) after the high-voltage switch is closed, the vehicle controller controls the steering controller and the direct-current converter to work, the steering controller drives the steering power-assisted oil pump motor to realize steering power assistance, and at the moment, because the output voltage of the direct-current converter is lower than the voltage of a high-voltage power supply, the input voltage of the steering controller is provided by the high-voltage power supply;
2) after the high-voltage switch is disconnected due to uncontrollable factors, the input voltage of the steering controller is rapidly reduced, and when the input voltage of the high-voltage switch is lower than the output voltage of the direct-current converter, the direct-current converter outputs current to drive the steering controller to continuously work and maintain the continuous running of a motor of the power-assisted steering pump;
3) in the disconnection process of the high-voltage switch, the vehicle controller starts to record working time and judge a vehicle speed signal, and when the vehicle speed signal is lower than a safety set vehicle speed, the vehicle controller controls the steering controller and the direct-current converter to stop working;
in the step 1), the direct current converter can continuously work, but due to the reverse cut-off action of the first one-way diode, the direct current converter has no actual power output, and meanwhile, the vehicle controller can detect the high-voltage power supply voltage, the steering controller input voltage and the vehicle speed signal in real time;
in the step 2), when the input voltage of the steering controller is lower than the output voltage of the direct current converter, the reverse blocking effect of the first unidirectional diode disappears, and the direct current converter immediately starts power output.
2. The electric motor coach dual-source power-assisted steering system as claimed in claim 1, wherein the high-voltage power supply is a direct-current power supply for providing power supply for the electric motor coach, and the high-voltage power supply includes but is not limited to a power battery, a super capacitor and a fuel cell system.
3. The electric motor coach dual-source power-assisted steering system as claimed in claim 1, wherein the steering controller is used for converting input direct current into alternating current and providing the alternating current to the power-assisted steering pump motor so as to realize the power-assisted steering of the electric motor coach.
4. The electric motor coach dual-source power-assisted steering system as claimed in claim 1, wherein the low-voltage power supply is an electric motor coach low-voltage power supply, including but not limited to 12V or 24V direct current power supply.
5. The electric motor coach dual-source power-assisted steering system as claimed in claim 1, wherein the dc converter is used for converting low-voltage dc of a low-voltage power supply into high-voltage dc for output.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810270935.XA CN108638983B (en) | 2018-03-29 | 2018-03-29 | Electric motor coach double-source power-assisted steering system and control method |
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| CN201810270935.XA CN108638983B (en) | 2018-03-29 | 2018-03-29 | Electric motor coach double-source power-assisted steering system and control method |
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| CN108638983B true CN108638983B (en) | 2021-11-16 |
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| CN109606111A (en) * | 2018-12-21 | 2019-04-12 | 中国重汽集团济南动力有限公司 | A kind of electric car supplementary controlled system and control method |
| CN112519580B (en) * | 2019-09-17 | 2022-10-21 | 顺丰科技有限公司 | Vehicle control system and control method |
| CN111204221B (en) * | 2020-03-17 | 2024-04-09 | 深圳市微燃科技有限公司 | Power supply circuit and method of high-voltage controller of electric automobile and electric automobile |
| CN111976828A (en) * | 2020-08-19 | 2020-11-24 | 南京金龙客车制造有限公司 | Double-source switching control system and method for steering system |
| JP7200210B2 (en) * | 2020-12-25 | 2023-01-06 | 本田技研工業株式会社 | moving body |
| CN115447664B (en) * | 2022-09-05 | 2023-09-22 | 摩登汽车有限公司 | Control method of electric power steering assistance system during emergency power down |
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