# US 7,609,023 B2 · Control apparatus for electric vehicles

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- Number: US 7,609,023 B2
- Document ID: US7609023B2
- Status: Granted
- Kind: B2
- Application number: 11/606,060
- Filed: 2006-11-30
- Published: 2007-06-07
- Granted: 2009-10-27
- Earliest claimed: 2005-12-07
- Assignees: Denso Corporation
- Inventors: Tsuneyuki Egami; Keiichi Kawakami
- Web page: https://patentgrep.com/patent/US7609023B2

## CPC

- B60L 50/61: by batteries charged by engine-driven generators, e.g. series hybrid electric vehicles
- B60K 6/445: Differential gearing distribution type
- B60L 15/025: {using field orientation; Vector control; Direct Torque Control [DTC]}
- B60L 50/15: with additional electric power supply (with capacitors charged by engine-driven generators B60L50/40; with batteries charged by engine-driven generators B60L50/61)
- B60L 50/16: with provision for separate direct mechanical propulsion
- B60W 10/08: including control of electric propulsion units, e.g. motors or generators
- H02P 21/06: Rotor flux based control involving the use of rotor position or rotor speed sensors
- B60L 2210/20: AC to AC converters
- B60L 2220/14: Synchronous machines
- B60R 16/02: electric {constitutive elements}
- B60W 20/00: Control systems specially adapted for hybrid vehicles {(hybrid vehicle design, B60K6/00; electric vehicles B60L)}
- Y02T 10/62: Hybrid vehicles
- Y02T 10/64: Electric machine technologies in electromobility
- Y02T 10/70: Energy storage systems for electromobility, e.g. batteries
- Y02T 10/7072: Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
- Y02T 10/72: Electric energy management in electromobility
- 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
- 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
- B60W: CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
- H02P: CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- B60R: VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION

## Abstract

In electric vehicle control, system voltage stabilization control is executed to reduce the difference between a target value and detected value of a system voltage generated by a voltage boosting converter for an AC motor. Further, conversion power control is executed to reduce the difference between a command value and detected value of the conversion power, which is defined as the output power of the voltage boosting converter. A conversion power correction quantity is computed from an input power operation quantity of the system voltage stabilization control and reflected in the conversion power control to correct the conversion power. Thus, variations in a system voltage caused by an error or the conversion power control can be reduced.

## Claims

### Claim 1

A control apparatus for an electric vehicle, comprising:
a power converter that converts a voltage supplied by a DC power supply into a system voltage appearing on a power supply line;
an MG unit that includes an inverter connected to the power supply line and drives an AC motor;
a system voltage stabilization controller that executes system voltage stabilization control to stabilize the system voltage by adjusting an input power of the MG unit in order to suppress variations in the system voltage while sustaining a torque generated by the AC motor at a torque command value; and
a conversion power controller that executes conversion power control on the basis of control information, which is defined as information on the system voltage stabilization control to stabilize the system voltage, to adjust a conversion power, which is defined as an input or output power of the power converter.

### Claim 2 (depends on 1)

The control apparatus according to claim 1, further comprising:
a correction quantity calculator that computes a correction quantity of the conversion power on the basis of the control information defined as the information on the system voltage stabilization control; and
a conversion power corrector that corrects the conversion power by reflecting the correction quantity in the conversion power computed by the correction quantity calculator.

### Claim 3 (depends on 2)

The control apparatus according to claim 2, wherein the correction quantity calculator computes the correction quantity of the conversion power on the basis of control information on the system voltage stabilization control to stabilize the system voltage, when the MG unit is in a steady state.

### Claim 4 (depends on 2)

The control apparatus according to claim 2, further comprising:
a target voltage setter that sets a target value of the system voltage;
a voltage detector that detects the system voltage; and
a power operation quantity calculator that computes an operation quantity of an input power of the MG unit on the basis of a value set by the target voltage setter for setting the target value of the system voltage and a system voltage detected by the voltage detector,
wherein the system voltage stabilization controller controls the system voltage by adjusting the input power of the MG unit on the basis of a quantity computed by the power operation quantity calculator as the operation quantity of the input power.

### Claim 5 (depends on 2)

The control apparatus according to claim 2, further comprising:
a conversion power command value calculator that computes a command value of the conversion power;
a conversion power detector that detects the conversion power; and
a conversion power control quantity calculator that computes a control quantity of the conversion power on the basis of a value computed by the conversion power command value calculator as the command value of the conversion power and a conversion power detected by the conversion power detector,
wherein the conversion power controller controls the conversion power on the basis of a control quantity computed by the conversion power control quantity calculator.

### Claim 6 (depends on 2)

The control apparatus according to claim 2, wherein
the system voltage stabilization controller controls the system voltage by adjusting an input power different from a power required for generation of a torque in the AC motor.

### Claim 7 (depends on 6)

The control apparatus according to claim 6, further comprising:
a motor controller that controls the AC motor by a sinusoidal-waveform PWM control method,
wherein the system voltage stabilization controller controls the input power of the MG unit by adjusting a vector of a current flowing to the AC motor or a vector of a voltage applied to the AC motor by the sinusoidal-waveform PWM control method.

### Claim 8 (depends on 6)

The control apparatus according to claim 6, further comprising:
a motor controller that controls the AC motor by a rectangular waveform control method,
wherein the system voltage stabilization controller controls the input power of the MG unit by adjusting a duty ratio and/or phase of a rectangular waveform representing an electrical conduction state of the AC motor by the rectangular waveform method.

### Claim 9 (depends on 1)

The control apparatus according to claim 1, further comprising:
a target voltage setter that sets a target system voltage;
a voltage detector that detects the system voltage; and
a subtraction unit that produces a difference between the target system voltage and the system voltage detected by the voltage detector,
wherein the control information is determined in accordance with the difference produced by the subtraction unit.

### Claim 10

A control apparatus for an electric vehicle, comprising:
a power converter that converts a voltage supplied by a DC power supply into a system voltage appearing on a power supply line;
an MG unit that includes an inverter connected to the power supply line and drives an AC motor;
a system voltage stabilization controller that executes system voltage stabilization control to stabilize the system voltage by adjusting an input power of the MG unit in order to suppress variations in the system voltage while sustaining a torque generated by the AC motor at a torque command value;
a conversion power controller that executes conversion power control on the basis of control information, which is defined as information on the system voltage stabilization control to stabilize the system voltage, to adjust a conversion power, which is defined as an input or output power of the power converter;
a correction quantity calculator that computes a correction quantity of the conversion power on the basis of the control information defined as the information on the system voltage stabilization control; and
a conversion power corrector that corrects the conversion power by reflecting the correction quantity in the conversion power computed by the correction quantity calculator,
wherein the correction quantity calculator computes the correction quantity of the conversion power on the basis of control information on the system voltage stabilization control to stabilize the system voltage, when the MG unit is in a steady state.

### Claim 11

A control apparatus for an electric vehicle, comprising:
a power converter that converts a voltage supplied by a DC power supply into a system voltage appearing on a power supply line;
an MG unit that includes an inverter connected to the power supply line and drives an AC motor;
a system voltage stabilization controller that executes system voltage stabilization control to stabilize the system voltage by adjusting an input power of the MG unit in order to suppress variations in the system voltage while sustaining a torque generated by the AC motor at a torque command value;
a conversion power controller that executes conversion power control on the basis of control information, which is defined as information on the system voltage stabilization control to stabilize the system voltage, to adjust a conversion power, which is defined as an input or output power of the power converter;
a correction quantity calculator that computes a correction quantity of the conversion power on the basis of the control information defined as the information on the system voltage stabilization control; and
a conversion power corrector that corrects the conversion power by reflecting the correction quantity in the conversion power computed by the correction quantity calculator; wherein:
the system voltage stabilization controller controls the system voltage by adjusting an input power different from a power required for generation of a torque in the AC motor,
the control apparatus further comprises a motor controller that controls the AC motor by a sinusoidal-waveform PWM control method, and
the system voltage stabilization controller controls the input power of the MG unit by adjusting a vector of a current flowing to the AC motor or a vector of a voltage applied to the AC motor by the sinusoidal-waveform PWM control method.

### Claim 12

A control apparatus for an electric vehicle, comprising:
a power converter that converts a voltage supplied by a DC power supply into a system voltage appearing on a power supply line;
an MG unit that includes an inverter connected to the power supply line and drives an AC motor;
a system voltage stabilization controller that executes system voltage stabilization control to stabilize the system voltage by adjusting an input power of the MG unit in order to suppress variations in the system voltage while sustaining a torque generated by the AC motor at a torque command value;
a conversion power controller that executes conversion power control on the basis of control information, which is defined as information on the system voltage stabilization control to stabilize the system voltage, to adjust a conversion power, which is defined as an input or output power of the power converter;
a correction quantity calculator that computes a correction quantity of the conversion power on the basis of the control information defined as the information on the system voltage stabilization control; and
a conversion power corrector that corrects the conversion power by reflecting the correction quantity in the conversion power computed by the correction quantity calculator; wherein:
the system voltage stabilization controller controls the system voltage by adjusting an input power different from a power required for generation of a torque in the AC motor,
the control apparatus further comprises a motor controller that controls the AC motor by a rectangular waveform control method, and
the system voltage stabilization controller controls the input power of the MG unit by adjusting a duty ratio and/or phase of a rectangular waveform representing an electrical conduction state of the AC motor by the rectangular waveform method.