# US 11,305,652 B2 · Regenerative braking control system for motor-driven vehicle

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 11,305,652 B2
- Document ID: US11305652B2
- Status: Granted
- Kind: B2
- Application number: 17/028,545
- Filed: 2020-09-22
- Published: 2021-11-11
- Granted: 2022-04-19
- Earliest claimed: 2020-05-11
- Assignees: Hyundai Motor Company; Kia Motors Corporation
- Applicants: Hyundai Motor Company; Kia Motors Corporation
- Inventors: Won Ki Park
- Web page: https://patentgrep.com/patent/US11305652B2

## CPC

- B60L 7/22: Dynamic electric resistor braking, combined with dynamic electric regenerative braking
- B60H 1/00392: {for electric vehicles having only electric drive means}
- B60H 1/03: and from a source other than the propulsion plant
- B60H 1/143: {the heat being derived from cooling an electric component, e.g. electric motors, electric circuits, fuel cells or batteries}
- B60K 1/00: Arrangement or mounting of electrical propulsion units (B60K7/00 takes precedence; arrangement or mounting of plural diverse prime-movers for mutual or common propulsion B60K6/00)
- B60K 11/02: with liquid cooling
- B60T 1/10: by utilising wheel movement for accumulating energy, e.g. driving air compressors
- F16D 61/00: Brakes with means for making the energy absorbed available for use (F16D57/00 takes precedence)
- H02P 3/04: Means for stopping or slowing by a separate brake, e.g. friction brake or eddy-current brake
- H02P 3/14: by regenerative braking
- H02P 3/22: by short-circuit or resistive braking
- B60K 2001/003: {with means for cooling the electrical propulsion units}
- B60K 2001/005: {the electric storage means}
- B60K 2001/006: {the electric motors}
- B60Y 2400/202: Fuel cells
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 90/40: Application of hydrogen technology to transportation, e.g. using fuel cells
- B60L: PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES (arrangements or mounting of electrical propulsion units or of plural diverse prime-movers for mutual or common propulsion in vehicles B60K1/00, B60K6/20; arrangements or mounting of electrical gearing in vehicles B60K17/12, B60K17/14; preventing wheel slip by reducing power in rail vehicles B61C15/08; dynamo-electric machines H02K; control or regulation of electric motors H02P); SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES (electric coupling devices combined with mechanical couplings of vehicles B60D1/64; electric heating for vehicles B60H1/00); ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL (control or regulation of electric motors H02P); MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
- B60K: ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60T: VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL (electrodynamic brake systems for vehicle, in general B60L; brakes per se, i.e. devices where braking effect occurs, including ultimate brake actuators, F16D); ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- F16D: COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- B60Y: INDEXING SCHEME RELATING TO ASPECTS CROSS-CUTTING VEHICLE TECHNOLOGY
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

A regenerative braking control system for a motor-driven vehicle is configured to provide a continuous assistant braking force by continuous reverse torque of an electric motor by enabling surplus electrical energy produced by an electric motor to be easily converted into thermal energy in generative braking, using both of a brake resistor and a heater to convert electrical energy into thermal energy, and being able to obtain an interior heating effect by using thermal energy converted by the brake resistor and the heater as heat source for interior heating without discharging the thermal energy to the outside.

## Claims

### Claim 1

A regenerative braking control system for a motor-driven vehicle, the regenerative braking control system comprising:
an electric motor configured to charge a battery with an electrical energy by operating as a power generator in regenerative braking;
a brake resistor configured to convert surplus electrical energy produced by the electric motor into thermal energy in regenerative braking;
a heater configured to convert surplus electrical energy produced by the electric motor into thermal energy together with the brake resistor;
a cooling water circulation line connected to the brake resistor and the heater so that cooling water can circulate; and
a controller configured to control the brake resistor and the heater to be turned on and off on the basis of charged amount information of the battery so that a heating mode, a regenerative braking mode, a heating and regenerative braking mode, and a maximum regenerative braking mode are performed.

### Claim 2 (depends on 1)

The regenerative braking control system of claim 1, wherein the cooling water circulation line includes:
a heating line extending from the heater and connected to a heater blower for interior heating;
a first cooling water return line extending from the heating line and connected to a radiator through the brake resistor;
a second cooling water return line extending from the heater blower and connected to the radiator; and
a cooling water supply line extending from the radiator and connected to the heater.

### Claim 3 (depends on 2)

The regenerative braking control system of claim 2, wherein a 3-way valve is controlled to be opened and closed in order to send cooling water to the heater blower or the brake resistor, the 3-way valve being disposed at a joint of the heating line and the first cooling water return line.

### Claim 4 (depends on 2)

The regenerative braking control system of claim 2, wherein an electric water pump is disposed in the cooling water supply line.

### Claim 5 (depends on 1)

The regenerative braking control system of claim 1, wherein, in the heating mode, the heater, an electric water pump, and a heater blower are operated, a 3-way valve is operated to open to a heating line and close to a first cooling water return line, and the brake resistor remains off in response to a control signal from the controller.

### Claim 6 (depends on 5)

The regenerative braking control system of claim 5, wherein when medium-temperature cooling water heated by the heater flows through the heating line and the heater blower, air to be blown to an interior by the heater blower is heated by the medium-temperature cooling water, whereby interior heating is performed.

### Claim 7 (depends on 1)

The regenerative braking control system of claim 1, wherein, in the regenerative braking mode, the brake resistor and an electric water pump are operated, a 3-way valve is operated to close to a heating line and open to a first cooling water return line, and the heater and a heater blower remain off in response to a control signal from the controller.

### Claim 8 (depends on 7)

The regenerative braking control system of claim 7, wherein, in the regenerative braking mode, surplus electrical energy produced by the electric motor is converted and consumed as thermal energy by the brake resistor, whereby an assistant braking force is continuously generated by continuous reverse torque of the electric motor.

### Claim 9 (depends on 7)

The regenerative braking control system of claim 7, wherein low-temperature cooling water flowing through a cooling water supply line from the radiator by operation of the electric water pump flows through a first cooling water return line and cools the brake resistor, and high-temperature cooling water coming out of the brake resistor after cooling the brake resistor flows back to the radiator.

### Claim 10 (depends on 1)

The regenerative braking control system of claim 1, wherein, in the heating and regenerative braking mode, the brake resistor, an electric water pump, the heater, and a heater blower are turned on and operated, and a 3-way valve is operated to an angle for opening to both of a heating line and a first cooling water return line in response to a control signal from the controller.

### Claim 11 (depends on 10)

The regenerative braking control system of claim 10, wherein the brake resistor and the heater convert surplus electrical energy produced by the electric motor into thermal energy for the regenerative braking mode, whereby an assistant braking force is continuously generated by continuous reverse torque of the electric motor.

### Claim 12 (depends on 10)

The regenerative braking control system of claim 10, wherein when medium-temperature cooling water heated by the heater for the heating mode flows through the heating line and the heater blower, air to be blown to an interior by the heater blower is heated by the medium-temperature cooling water, whereby interior heating is performed.

### Claim 13 (depends on 10)

The regenerative braking control system of claim 10, wherein medium-temperature cooling water heated by the heater flows to the brake resistor through a first cooling water return line by operation of the electric water pump and high-temperature cooling water after cooling the brake resistor flows to a radiator for cooling.

### Claim 14 (depends on 1)

The regenerative braking control system of claim 1, wherein, in the maximum regenerative braking mode, the brake resistor, an electric water pump, and the heater are turned on and operated, a 3-way valve is operated to close to a heating line and open to a first cooling water return line, and a heater blower remains off in response to a control signal from the controller.

### Claim 15 (depends on 14)

The regenerative braking control system of claim 14, wherein, in the maximum regenerative braking mode, the brake resistor and the heater convert surplus electrical energy produced by the electric motor into thermal energy, whereby an assistant braking force is continuously generated by continuous reverse torque of the electric motor.

### Claim 16 (depends on 15)

The regenerative braking control system of claim 15, wherein when a State of Charge (SOC) of the battery is 100%, electrical energy produced by the electric motor wholly becomes surplus electrical energy and is converted and consumed as thermal energy by the brake resistor and the heater, whereby an assistant braking force is maximally generated by continuous reverse torque of the electric motor.

### Claim 17 (depends on 14)

The regenerative braking control system of claim 14, wherein low-temperature cooling water flowing through a cooling water supply line from a radiator by operation of the electric water pump sequentially cools the hater and the brake resistor while passing through cooling water channels of the heater and the brake resistor, and high-temperature cooling water coming out of the brake resistor after cooling the brake resistor flows back to the radiator.