CN112298340B - Power-assisted steering system and vehicle - Google Patents
Power-assisted steering system and vehicle Download PDFInfo
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- CN112298340B CN112298340B CN201910678259.4A CN201910678259A CN112298340B CN 112298340 B CN112298340 B CN 112298340B CN 201910678259 A CN201910678259 A CN 201910678259A CN 112298340 B CN112298340 B CN 112298340B
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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
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L1/00—Supplying electric power to auxiliary equipment of vehicles
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
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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
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/046—Controlling the motor
- B62D5/0463—Controlling the motor calculating assisting torque from the motor based on driver input
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2210/00—Converter types
- B60L2210/10—DC to DC converters
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Steering Mechanism (AREA)
- Steering Control In Accordance With Driving Conditions (AREA)
Abstract
The invention relates to a power-assisted steering system and a vehicle, and belongs to the technical field of new energy automobile steering. The system comprises a steering motor, a controller, a storage battery, a power battery, a DC/DC circuit and a low-voltage power supply circuit, wherein the storage battery is connected at the upper stream of the low-voltage power supply circuit, the steering motor and the controller are connected in parallel on the low-voltage power supply circuit, the power battery is connected with the high-voltage side of the DC/DC circuit, the low-voltage side of the DC/DC circuit is connected in parallel on the low-voltage power supply circuit, an undervoltage relay used for detecting the short circuit or undervoltage of the storage battery is arranged in series on the low-voltage power supply circuit at the upper stream of the low-voltage side parallel point of the DC/DC circuit, and a control coil of the undervoltage relay is directly connected in parallel with the storage battery. When the storage battery is in short circuit or under-voltage, the system disconnects the storage battery from the DC/DC circuit, avoids the output voltage of the DC/DC circuit from being pulled down, enables the steering motor and the controller to provide an A-level voltage power supply through the power battery and the DC/DC circuit, maintains the steering power-assisted state, and improves the driving safety.
Description
Technical Field
The invention relates to a power-assisted steering system and a vehicle, and belongs to the technical field of new energy automobile steering.
Background
The steering system of modern traditional fuel (gasoline, diesel oil, CNG, LNG) automobile comprises the following components: a mechanical steering system MS, a hydraulic power-assisted steering system HPS, an electric hydraulic power-assisted steering system EHPS and an electric power-assisted steering system EPS. In order to realize the improvement of the operating stability of low-speed light and high-speed non-floating (i.e. the steering force is too light and the road feel is not strong), and simultaneously consider the condition of energy conservation, the electric hydraulic power steering system EHPS and the electric power steering system EPS are widely applied.
The steering assistance of the EHPS is provided by a steering oil pump driven by a steering motor, and the control circuits of the steering motor and a controller (hereinafter referred to as the controller) for driving the steering motor adopt an A-level voltage power supply (such as 12VDC or 24VDC) of a storage battery; the steering power of the EPS is directly provided by a steering motor, and the steering motor and a control circuit of a controller also adopt an A-level voltage power supply of a storage battery. The control circuit adopts a class A voltage power supply and a single wire system (the negative pole is grounded at the same potential) as shown in figure 1.
With the development of the technology, new energy vehicles gradually occupy the market, the new energy vehicles are divided into two categories, namely hybrid power (plug-in or non-plug-in type) and pure electric (including fuel cells), the engine of the hybrid new energy vehicle adopts the idling stop function, the engine of the pure electric new energy vehicle is cancelled, the new energy vehicles certainly consider the requirements of steering power and energy conservation, and the steering system adopts EHPS or EPS. On the basis of the control circuit, because the new energy vehicle contains the power battery, in order to guarantee the reliable power supply of steering motor and controller, generally all adopt dual power supply, for example, the chinese utility model patent document with the grant publication number of CN 205186269U, this patent document discloses an automobile-used double-source low-voltage electric power steering system, provide a level voltage power supply to steering motor and controller through high-voltage energy storage unit and DC/DC converter earlier, when the high-voltage energy storage unit became invalid, switch over to the drive of low-voltage battery, steering system's reliability has been improved, nevertheless under the condition that the battery appears the short circuit or the undervoltage trouble, the battery of trouble still is connected in the power supply line that turns to motor and controller, cause the potential safety hazard, make the security of driving reduce.
Disclosure of Invention
The invention aims to provide a power-assisted steering system, which is used for solving the problem of low system safety; still provide a vehicle simultaneously for solve the problem that the power assisted steering system security of current vehicle is low.
In order to achieve the purpose, the invention provides a power-assisted steering system which comprises a steering motor, a controller, a storage battery, a power battery, a DC/DC circuit and a low-voltage power supply circuit, wherein the storage battery is connected to the upstream of the low-voltage power supply circuit, the steering motor and the controller are connected to the low-voltage power supply circuit in parallel, the power battery is connected to the high-voltage side of the DC/DC circuit, the low-voltage side of the DC/DC circuit is connected to the low-voltage power supply circuit in parallel, an under-voltage relay for detecting the short circuit or under-voltage of the storage battery is arranged on the low-voltage power supply circuit at the upstream of the low-voltage side parallel point of the DC/DC circuit in series, and a control coil of the under-voltage relay is directly connected to the storage battery in parallel.
The beneficial effects are that: according to the system, an undervoltage relay is connected in series on a low-voltage power supply circuit on the upper stream of a parallel point on the low-voltage side of a DC/DC circuit, when a storage battery is in a short circuit or under-voltage, a control coil of the undervoltage relay loses power, so that a contact of the undervoltage relay is disconnected, the storage battery is disconnected with the DC/DC circuit, the output voltage of the DC/DC is prevented from being pulled down, a power battery and the DC/DC circuit provide an A-level voltage power supply for a steering motor and a controller, the steering power-assisted state is maintained, and the driving safety is improved.
Furthermore, in order to safely control the power supply of the low-voltage power supply line, the system further comprises an ACC switch relay, the ACC switch relay is serially connected into the low-voltage power supply line on the upstream of the undervoltage relay, and a control coil of the ACC switch relay is connected onto the low-voltage power supply line on the upstream of the ACC switch relay in parallel.
Further, in order to safely control the working states of the steering motor and the controller, the system further comprises an ON switch relay which is connected in series in a low-voltage power supply line downstream of the low-voltage side parallel point of the DC/DC circuit, and a control coil of the ON switch relay is connected in parallel ON the low-voltage power supply line upstream of the ON switch relay.
Furthermore, in order to prevent backflow from damaging the DC/DC circuit, an anti-reverse diode is arranged between the low-voltage side of the DC/DC circuit and a low-voltage power supply line.
In addition, the invention also provides a vehicle which comprises a power-assisted steering system, wherein the power-assisted steering system comprises a steering motor and a controller, a storage battery, a power battery, a DC/DC circuit and a low-voltage power supply line, the storage battery is connected with the upper stream of the low-voltage power supply line, the steering motor and the controller are connected on the low-voltage power supply line in parallel, the power battery is connected with the high-voltage side of the DC/DC circuit, the low-voltage side of the DC/DC circuit is connected on the low-voltage power supply line in parallel, an under-voltage relay for detecting the short circuit or the under-voltage of the storage battery is arranged on the low-voltage power supply line at the upper stream of the low-voltage side parallel point of the DC/DC circuit in series, and a control coil of the under-voltage relay is directly connected with the storage battery in parallel.
The beneficial effects are that: the power-assisted steering system in the vehicle is characterized in that an undervoltage relay is connected in series on a low-voltage power supply line on the upper stream of a parallel point on the low-voltage side of a DC/DC circuit, when a storage battery is short-circuited or undervoltage, a control coil of the undervoltage relay is de-energized, a contact of the undervoltage relay is disconnected, the storage battery is disconnected with the DC/DC circuit, the output voltage of the DC/DC circuit is prevented from being lowered, a steering motor and a controller are enabled to be provided with an A-level voltage power supply through a power battery and the DC/DC circuit, the steering power-assisted state is maintained, and the driving safety is improved.
Furthermore, in order to safely control the power supply of the low-voltage power supply line, the system further comprises an ACC switch relay, the ACC switch relay is serially connected into the low-voltage power supply line on the upstream of the undervoltage relay, and a control coil of the ACC switch relay is connected onto the low-voltage power supply line on the upstream of the ACC switch relay in parallel.
Further, in order to safely control the working states of the steering motor and the controller, the system further comprises an ON switch relay which is connected in series in a low-voltage power supply line downstream of the low-voltage side parallel point of the DC/DC circuit, and a control coil of the ON switch relay is connected in parallel ON the low-voltage power supply line upstream of the ON switch relay.
Furthermore, in order to prevent backflow from damaging the DC/DC circuit, an anti-reverse diode is arranged between the low-voltage side of the DC/DC circuit and a low-voltage power supply line.
Drawings
FIG. 1 is a control circuit diagram of a steering motor and controller of a conventional fuel cell vehicle of the prior art;
fig. 2 is a control circuit diagram of a steering motor and a controller in the new energy vehicle according to the present invention.
Detailed Description
The embodiment of the vehicle is as follows:
the vehicle proposed in this embodiment includes a power steering system as shown in fig. 2, which includes a steering motor and controller, a battery, a power battery, a DC/DC circuit (i.e. DCDC in fig. 2), and a low voltage power supply line (typically 12 or 24V line, the same as the voltage of the class a voltage power supply).
The storage battery is connected to the upper reaches of a low-voltage power supply circuit, the steering motor and the controller are connected to the low-voltage power supply circuit in parallel, the power battery is connected to the high-voltage side of the DC/DC circuit, the low-voltage side of the DC/DC circuit is connected to the low-voltage power supply circuit in parallel, an undervoltage relay (a transistor type undervoltage relay, namely a static undervoltage relay) is connected to the low-voltage power supply circuit in series at the upper reaches of the low-voltage side parallel point of the DC/DC circuit, a control coil of the undervoltage relay is directly connected to the storage battery in parallel, and a contact of the undervoltage relay is arranged on the low-voltage power supply circuit.
In fig. 2, a broken line represents a high-voltage power supply line, a solid line represents a low-voltage power supply line and a control line, and a negative electrode ground is a ground line. After the main switch is closed, the power-assisted steering system supplies power for a dual power supply, and the storage battery supplies power to the steering motor and a controller (the controller is used for driving the steering motor and is generally integrated) through a low-voltage power supply line; the power battery is connected with the high-voltage side of the DC/DC circuit through a high-voltage power supply circuit BMS, and supplies power to the steering motor and the controller through the low-voltage side of the DC/DC circuit; meanwhile, the power battery can also charge the storage battery. The under-voltage relay is used for detecting faults such as short circuit or under-voltage of the storage battery, when the main switch is closed, a control coil of the under-voltage relay is electrified, a contact of the under-voltage relay is connected, and a low-voltage power supply line is connected; when the storage battery is in short circuit or under-voltage, the control coil of the under-voltage relay loses power, so that the contact of the under-voltage relay is disconnected, the storage battery is further disconnected with the low-voltage side of the DC/DC circuit, and the voltage of the steering motor and the voltage of the controller are prevented from being reduced.
In this embodiment, for the power supply of further safe control low voltage power supply line, this system still includes ACC switch relay, ACC switch relay establishes ties in the low voltage power supply line of owing voltage relay upstream, ACC switch relay's control coil connects in parallel on the low voltage power supply line of ACC switch relay upstream, the low voltage power supply line that ACC switch relay's contact set up was on, the master switch is closed the back, when key ACC switch closure, ACC switch relay's control coil gets electric, and then ACC switch relay's contact is closed, make the switch-on of low voltage power supply line. As another embodiment, in the case where the main switch can be safely controlled, the ACC switch relay may not be provided.
In this embodiment, in order to safely control the operating states of the steering motor and the controller, the system further includes an ON switch relay, the ON switch relay is serially connected to a low-voltage power supply line downstream of a low-voltage side parallel point of the DC/DC circuit, a control coil of the ON switch relay is connected in parallel to the low-voltage power supply line upstream of the ON switch relay, a contact of the ON switch relay is arranged ON the low-voltage power supply line, after the key ON switch is closed, the control coil of the ON switch relay is powered ON, the contact of the ON switch relay is turned ON, and the steering motor and the controller start to operate. As another embodiment, in the case where the main switch can be safely controlled, the ACC switch relay may not be provided.
In this embodiment, in order to prevent the DC/DC circuit from being damaged by the backflow, an anti-reverse diode is provided between the low-voltage side of the DC/DC circuit and the low-voltage power supply line. As another embodiment, the anti-reverse diode may not be provided while ensuring no backflow.
Of course, under the condition of ensuring that the vehicle runs normally, the vehicle also comprises a vehicle control unit, other electric devices or other vehicle-mounted devices which are connected in parallel on a low-voltage power supply circuit at the downstream of the parallel connection point of the DC/DC circuit, and power is supplied through a low-voltage power supply wire bundle. The normally live condition consumer and the power battery charging relay are typically powered by the battery, and thus the normally live condition consumer is connected in parallel to the low voltage power supply harness upstream of the ACC switching relay. As shown in fig. 2, after the main switch is closed, the battery management system is turned on, so that it can be ensured that the power battery can be charged by the generator or the charger.
When the DC/DC circuit works, the power battery provides an A-level voltage power supply for the steering motor and the controller through the DC/DC circuit, and can also charge the storage battery; when the DC/DC circuit does not work or the power battery loses power, an A-level voltage power supply is provided for the steering motor and the controller through the storage battery, and the under-voltage relay cuts off the connection between the storage battery and the low-voltage side of the DC/DC circuit under the condition that the storage battery is in a short circuit or under-voltage state, so that the steering power-assisted state is maintained, and the driving safety is ensured.
Power-assisted steering System embodiments:
the specific components, connection relationships and working processes of the power steering system provided in this embodiment have been described in the foregoing vehicle embodiments, and are not described in detail herein.
Claims (6)
1. A power-assisted steering system comprises a steering motor and a controller, a storage battery, a power battery, a DC/DC circuit and a low-voltage power supply circuit, wherein the storage battery is connected with the upstream of the low-voltage power supply circuit; the system further comprises an ACC switch relay, the ACC switch relay is serially connected in a low-voltage power supply line on the upstream of the undervoltage relay, and a control coil of the ACC switch relay is connected in parallel on the low-voltage power supply line on the upstream of the ACC switch relay.
2. The power steering system according to claim 1, further comprising an ON switch relay provided in series in the low-voltage power supply line downstream of the low-voltage-side parallel point of the DC/DC circuit, a control coil of the ON switch relay being connected in parallel ON the low-voltage power supply line upstream of the ON switch relay.
3. A power assisted steering system according to claim 1 or claim 2, wherein an anti-kickback diode is provided between the low voltage side of the DC/DC circuit and the low voltage supply line.
4. A vehicle comprises a power-assisted steering system, wherein the power-assisted steering system comprises a steering motor and a controller, a storage battery, a power battery, a DC/DC circuit and a low-voltage power supply circuit, the storage battery is connected with the upstream of the low-voltage power supply circuit, the steering motor and the controller are connected with the low-voltage power supply circuit in parallel, the power battery is connected with the high-voltage side of the DC/DC circuit, the low-voltage side of the DC/DC circuit is connected with the low-voltage power supply circuit in parallel, and the vehicle is characterized in that an under-voltage relay for detecting the short circuit or the under-voltage of the storage battery is arranged on the low-voltage power supply circuit in series at the upstream of the parallel point of the low-voltage side of the DC/DC circuit, and a control coil of the under-voltage relay is directly connected with the storage battery in parallel; the system further comprises an ACC switch relay, the ACC switch relay is serially connected in a low-voltage power supply line on the upstream of the undervoltage relay, and a control coil of the ACC switch relay is connected in parallel on the low-voltage power supply line on the upstream of the ACC switch relay.
5. The vehicle according to claim 4, characterized in that the system further comprises an ON switch relay provided in series in the low-voltage power supply line downstream of the low-voltage-side parallel point of the DC/DC circuit, a control coil of the ON switch relay being connected in parallel ON the low-voltage power supply line upstream of the ON switch relay.
6. A vehicle according to claim 4 or 5, characterised in that an anti-reverse diode is provided between the low voltage side of the DC/DC circuit and the low voltage supply line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910678259.4A CN112298340B (en) | 2019-07-25 | 2019-07-25 | Power-assisted steering system and vehicle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910678259.4A CN112298340B (en) | 2019-07-25 | 2019-07-25 | Power-assisted steering system and vehicle |
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| Publication Number | Publication Date |
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| CN112298340A CN112298340A (en) | 2021-02-02 |
| CN112298340B true CN112298340B (en) | 2021-11-26 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910678259.4A Active CN112298340B (en) | 2019-07-25 | 2019-07-25 | Power-assisted steering system and vehicle |
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Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005287242A (en) * | 2004-03-30 | 2005-10-13 | Toyota Motor Corp | Power supply unit for vehicle |
| CN202004422U (en) * | 2011-04-21 | 2011-10-05 | 李海兵 | Fireproof automatic breaker for automobiles |
| CN102501770A (en) * | 2011-11-03 | 2012-06-20 | 中国科学院电工研究所 | Electrical system for pure electric vehicle |
| CN205186269U (en) * | 2015-12-10 | 2016-04-27 | 苏州绿控传动科技有限公司 | Automobile -used couple of source low pressure electric power steering system |
| CN105691209A (en) * | 2016-04-08 | 2016-06-22 | 同济大学 | Electrical system for controller with distribution type architecture and power supply redundancy electric intelligent vehicle |
| CN206664682U (en) * | 2017-04-05 | 2017-11-24 | 天津市松正电动汽车技术股份有限公司 | A kind of dual power source electric boosting steering system |
| CN207902187U (en) * | 2018-02-24 | 2018-09-25 | 普天新能源车辆技术有限公司 | A kind of electric vehicle low pressure self saving control circuit |
| CN109249986A (en) * | 2017-07-14 | 2019-01-22 | 郑州宇通客车股份有限公司 | A kind of double source electric hydraulic power-assisted steering system and vehicle |
-
2019
- 2019-07-25 CN CN201910678259.4A patent/CN112298340B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005287242A (en) * | 2004-03-30 | 2005-10-13 | Toyota Motor Corp | Power supply unit for vehicle |
| CN202004422U (en) * | 2011-04-21 | 2011-10-05 | 李海兵 | Fireproof automatic breaker for automobiles |
| CN102501770A (en) * | 2011-11-03 | 2012-06-20 | 中国科学院电工研究所 | Electrical system for pure electric vehicle |
| CN205186269U (en) * | 2015-12-10 | 2016-04-27 | 苏州绿控传动科技有限公司 | Automobile -used couple of source low pressure electric power steering system |
| CN105691209A (en) * | 2016-04-08 | 2016-06-22 | 同济大学 | Electrical system for controller with distribution type architecture and power supply redundancy electric intelligent vehicle |
| CN206664682U (en) * | 2017-04-05 | 2017-11-24 | 天津市松正电动汽车技术股份有限公司 | A kind of dual power source electric boosting steering system |
| CN109249986A (en) * | 2017-07-14 | 2019-01-22 | 郑州宇通客车股份有限公司 | A kind of double source electric hydraulic power-assisted steering system and vehicle |
| CN207902187U (en) * | 2018-02-24 | 2018-09-25 | 普天新能源车辆技术有限公司 | A kind of electric vehicle low pressure self saving control circuit |
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| CN112298340A (en) | 2021-02-02 |
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Address after: 450061 Yudao Road, Guancheng District, Zhengzhou City, Henan Province Patentee after: Yutong Bus Co.,Ltd. Address before: No.1, Shibali Heyu Road, Guancheng Hui District, Zhengzhou City, Henan Province Patentee before: ZHENGZHOU YUTONG BUS Co.,Ltd. |
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