Engineer

Only available on StudyMode
  • Topic: Electronic stability control, Anti-lock braking system, Robert Bosch GmbH
  • Pages : 31 (3619 words )
  • Download(s) : 74
  • Published : May 21, 2013
Open Document
Text Preview
Sensing in Automotive Powertrain and Braking Systems

1

Agenda
• Brief Introduction
• Automotive electronics & sensors • Capabilities available from ON Semiconductor

• Powertrain Systems
• Gasoline and diesel engines • Main powertrain sensors

• Braking and Stability Control Systems
• Basic systems: ABS, EBD, TCS, ESC • Sensors for dynamic braking

• Examples of automotive sense interface ICs
• Sensing interface IP from ON Semiconductor
2

Automotive Electronics
• Value added by ON Semiconductor APG
– Proprietary High-Voltage Processes – Innovative Solutions: Sensor Interfaces, IVN, High-Voltage System-on-Chip – Harsh Environment Applications – Extensive Automotive Portfolio ← focus area for green electronics



Key Successes in sensing
– – – – Steering/Pedal Angle Sensor Pressure sensors for Powertrain / Braking Position Sensors for Headlight Control Gyro Sensors for Stability Control



Main drivers for new electronics
– Safety – Emissions – Fuel consumption



Regulation plays a key role

3

Modern Automotive Sensors
• • • • • • • • External sensing element or MEMS Built-in protections (shorts, EMI, ESD…) Diagnostic modes / redundancy Accuracy / linearity reaching ~0.1% to 1% NVM for trimming and calibration Nonlinear temperature compensation TJ at IC: from –40 oC up to +125~200 oC Target failure rate: zero ppm

4

Automotive Technologies Portfolio
Voltage
100 V 80 V HBIMOS I2T100 50 V I3T50 25 V 5V 3.3 V 1.8 V ABX C07 1K 5K 0.7 u 0.6 u I2T30(E) C5X I3T25 D3 C035 C3,C035U 100K

I3T80 I4T

C018 500K 0.18 u

Gate Count
Geometry
(drawn poly)

Features
5

>1.5 u

0.35 u

(OTP, EEPROM, etc.)

Non-volatile Memory (NVM) IP
• EEPROM
– – – – – Long experience, started with C5 NASTEE release in 1999 Non-added-steps EEPROMS available today for C5 / C3 / I3T50 I3T50 EEPROM is capable of 175 oC operation (reading) EE being released for I3T25U (Q4 2009) Development for 0.18 u ongoing

• OTP
– OTP is Zener diode zap – Available in I2T100, I3T25, I3T50, I3T80

• Flash
– Requires 5 added process steps – Special technology developed only for I3T80 – Technology is qualified to 150 oC read (50 oC for write) 6

Analog Control and Signal Processing : Voltage regulators Amplifiers, comparators ADC, DAC Filters (SC, GMC, RC) …

I3T Example
Vdc < 65V/36V/18V
Digital Signal Processing and Control :

Peripheral Extension

Peripheral Extension

Vbat 5 V Regulator
AMUX

ROM or Flash

State Machine or uController based

Sensor Int. : HV / LV Inductive Capacitive Resistive Temperature …

S/H

JTAG Timer PWM GPIO Comm. Control Unit
LIN BSD RS-232 …

PGA

ADC

RAM

BUF

DAC

ARM7 R8051

HV HV

Temp sense

Drivers : Motor Relay Lamp Heat …

OTP
Diagnostics

EEPROM

Logic Control Block

LIN Transceiver

7

8

Gasoline Engine System Concept

Source: Continental

9

Diesel Engine

10

The Internal Combustion Engine
Chemical equation for stoichiometric hydrocarbon burning

y⎞ ⎛ ⎛ y⎞ C x H y + ⎜ x + ⎟O 2 → xCO 2 + ⎜ ⎟ H 2 O + Heat 4⎠ ⎝ ⎝2⎠ Nikolaus Otto Rudolf Diesel

Partial combustion Fuel evaporation Nitrogen from air Sulfur from fuel

HC – Hydrocarbons (unburned) CO – Carbon monoxide NO, NO2 – Nitrogen oxides (NOx) SO2 – Sulfur dioxide Diesel particulate matter (DPM) 11

Electronic Fuel Injection (EFI)
• • Stringent emission regulations obsoleted the carburetor (~80’s) Advantages of EFI – Precise and accurate fuel measurement – Improved cylinder-to-cylinder fuel distribution (MPFI, GDI, DDI) – Predictable exhaust composition – Enables use of optimized catalytic converters



Net benefits
– #1: Lower emissions – #2: Higher efficiency – #3: Increased power

12

The ECU Control Loop
SENSORS
Throttle position Intake air temperature Manifold air pressure Mass air flow (MAF) Fuel pressure In-cylinder pressure Coolant temperature Crankshaft position Camshaft position Engine speed Engine...
tracking img