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HDS 9 General description          Mechanical Interfaces          Electrical Interfaces          Accordance of standards

General description

   An internal combustion engine controller is a device that provides engine control all strategies, fuel supply, forced spark ignition control, control of many engine operating parameters and implements self-diagnosis functions and safety of the engine and all auxiliary systems.

   Our joint development of a new controller began with the Italian company Metatron in 2014. Before our participation, Metatron was producing a serial device the HDS7 model. The next model Metatron was to be called HDS8, but the beginning of our participation in the project and the formation of new expanded requirements for the functionality of the controller led to the formation of a new model - HDS9.

The ECU is designed for 24V battery systems, 12V battery system is available as option. The ECU is able to manage:

   The ECU is equipped with internal temperature and pressure sensors. Three separate power supply lines (5V) are available for sensor supply. The ECU is provided with the NXP multicore microprocessor MPC5777 and with the NXP power system basis chip (power SBC) 33908 (multi-output power supply integrated circuit dedicated to the automotive market). The multicore microprocessor and the power SBC include enhanced safety features, becoming a safety oriented system and reaching a high integrity safety level.

   The ECU is equipped with embedded software fully developed by Metatron through a Model Based Approach according to the current state of the art widely diffused into the automotive field. The ECU is able to perform all the control functions needed to safely operate a spark ignited engine including:

   On Board Diagnostics software functions have been developed in order to comply with European applicable standards in order to optimize the engine performances, reduce the pollutant emissions and continuously monitoring the system integrity and reliability.

   ECU pins are short circuit protected to battery+, ground and to each other connections, with the exceptions below: ground pins are not protected against short circuit to supply voltage Battery+ and positive supply pins are not protected against short circuit to ground.

Mechanical Interfaces
Installation position
The ECU shall be mounted in vertical position (along vehicle Z axis), as indicated in document ME-SP-A-H900004 (HDS9 – Installation Note). Any other mounting position is not recommended and must be agreed with Metatron engineers.

Dimensions and weight
The ECU weight is about 1050g.

The connector used is an AMP-TYCO 154 pins, item type P/N. 284617.

Electrical Interfaces
      Blocks Diagram of ECU Architecture
Inputs Description
Analog inputs.
There are 28 input conditioning circuits for external sensors:
  • 9 circuits for temperature sensors, NTC or PTC type
  • 10 circuits for pressure sensors
  • 6 circuits for position sensors (tipically potentiometers)
  • 2 circuits for HEGO (ON/OFF) lambda sensors
  • 1 circuit for UEGO (linear) lambda sensor (BOSCH LSU 4.9 and 5.2)
  • Moreover the ECU is provided with:
  • 1 circuit for battery+ voltage measurement
  • 1 circuit for power load supply voltage (battery+ voltage after loads relay)
  • 3 circuits for 5V sensors power supply measurement
  • 1 circuit for atmospheric pressure measurement (internal sensor)
  • 1 circuit for internal ECU temperature measurement (NTC internal sensor)

Digital inputs
   There are 15 input conditioning circuits for external switches. Each input channel can be configured, via software, with pullup or pulldown resistor, according to switch connection to ground or to battery voltage. There are also two specific inputs dedicated to:
Frequency inputs
   Input conditioning circuits for:

Outputs Description
ON/OFF Outputs

PWM/Frequency Outputs

Ignition command
   Eight ignition commands are available, they are dedicate only to active coils and are able to provide up to 10mA (source current). For particular applications these outputs can be configured as low side driver: 0.025A RMS, 0.05A peak.

Injection command
   Eight half bridge channels for injectors driving are available (ON/OFF or Peak&Hold type): 2.5A RMS, 8A peak channel in normal operation, for ant sticking operation, in cold condition and for a very short time (50ms), peak current could be increased up to 10A.

H Bridges command
   There are two channels for H bridge actuators (i.e. electronic controlled throttle): 3.5A RMS, 7A peak.

   The ECU is equipped with the NXP microprocessor COBRA55 (MPC5777). The MPC5777C Power Architecture MCU is dedicated to industrial and automotive engine control applications that require advanced performances, timing systems, security, and functional safety capabilities. This microprocessor offers a high-performance multicore architecture with industry standard eTPU based timer system, a security module and the highest level of functional safety (ASIL-D) support. Microprocessor main characteristics are:
   HDS9 is provided with four Controller Area Network communication modules, according to BOSCH specification 2.0B, one of these (CAN1) supports CAN FD extension. One LIN transceiver compatible with LIN Protocol Specification 1.3, 2.0, 2.1, 2.2 and SAEJ2602-2 is available as option.

Accordance of standards
Compliancy with international standards
HDS9 ECU is compliant to the following satndards:

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